add dataplex firestore

internal/server/api.go

@@ -19,7 +19,6 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
@@ -235,8 +234,10 @@ func toolInvokeHandler(s *Server, w http.ResponseWriter, r *http.Request) {
 	params, err := parameters.ParseParams(tool.GetParameters(), data, claimsFromAuth)
 	if err != nil {
 		// If auth error, return 401
-		if errors.Is(err, util.ErrUnauthorized) {
-			s.logger.DebugContext(ctx, fmt.Sprintf("error parsing authenticated parameters from ID token: %s", err))
+		errMsg := fmt.Sprintf("error parsing authenticated parameters from ID token: %w", err)
+		var clientServerErr *util.ClientServerError
+		if errors.As(err, &clientServerErr) && clientServerErr.Code == http.StatusUnauthorized {
+			s.logger.DebugContext(ctx, errMsg)
 			_ = render.Render(w, r, newErrResponse(err, http.StatusUnauthorized))
 			return
 		}
@@ -259,34 +260,49 @@ func toolInvokeHandler(s *Server, w http.ResponseWriter, r *http.Request) {
 
 	// Determine what error to return to the users.
 	if err != nil {
-		errStr := err.Error()
-		var statusCode int
+		var tbErr util.ToolboxError
 
-		// Upstream API auth error propagation
-		switch {
-		case strings.Contains(errStr, "Error 401"):
-			statusCode = http.StatusUnauthorized
-		case strings.Contains(errStr, "Error 403"):
-			statusCode = http.StatusForbidden
-		}
+		if errors.As(err, &tbErr) {
+			switch tbErr.Category() {
+			case util.CategoryAgent:
+				// Agent Errors -> 200 OK
+				s.logger.DebugContext(ctx, fmt.Sprintf("Tool invocation agent error: %v", err))
+				_ = render.Render(w, r, newErrResponse(err, http.StatusOK))
+				return
 
-		if statusCode == http.StatusUnauthorized || statusCode == http.StatusForbidden {
-			if clientAuth {
-				// Propagate the original 401/403 error.
-				s.logger.DebugContext(ctx, fmt.Sprintf("error invoking tool. Client credentials lack authorization to the source: %v", err))
+			case util.CategoryServer:
+				// Server Errors -> Check the specific code inside
+				var clientServerErr *util.ClientServerError
+				statusCode := http.StatusInternalServerError // Default to 500
+
+				if errors.As(err, &clientServerErr) {
+					if clientServerErr.Code != 0 {
+						statusCode = clientServerErr.Code
+					}
+				}
+
+				// Process auth error
+				if statusCode == http.StatusUnauthorized || statusCode == http.StatusForbidden {
+					if clientAuth {
+						// Token error, pass through 401/403
+						s.logger.DebugContext(ctx, fmt.Sprintf("Client credentials lack authorization: %v", err))
+						_ = render.Render(w, r, newErrResponse(err, statusCode))
+						return
+					}
+					// ADC/Config error, return 500
+					statusCode = http.StatusInternalServerError
+				}
+
+				s.logger.ErrorContext(ctx, fmt.Sprintf("Tool invocation server error: %v", err))
 				_ = render.Render(w, r, newErrResponse(err, statusCode))
 				return
 			}
-			// ADC lacking permission or credentials configuration error.
-			internalErr := fmt.Errorf("unexpected auth error occured during Tool invocation: %w", err)
-			s.logger.ErrorContext(ctx, internalErr.Error())
-			_ = render.Render(w, r, newErrResponse(internalErr, http.StatusInternalServerError))
+		} else {
+			// Unknown error -> 500
+			s.logger.ErrorContext(ctx, fmt.Sprintf("Tool invocation unknown error: %v", err))
+			_ = render.Render(w, r, newErrResponse(err, http.StatusInternalServerError))
 			return
 		}
-		err = fmt.Errorf("error while invoking tool: %w", err)
-		s.logger.DebugContext(ctx, err.Error())
-		_ = render.Render(w, r, newErrResponse(err, http.StatusBadRequest))
-		return
 	}
 
 	resMarshal, err := json.Marshal(res)

internal/server/common_test.go

@@ -30,6 +30,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/server/resources"
 	"github.com/googleapis/genai-toolbox/internal/telemetry"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -51,7 +52,7 @@ type MockTool struct {
 	requiresClientAuthrorization bool
 }
 
-func (t MockTool) Invoke(context.Context, tools.SourceProvider, parameters.ParamValues, tools.AccessToken) (any, error) {
+func (t MockTool) Invoke(context.Context, tools.SourceProvider, parameters.ParamValues, tools.AccessToken) (any, util.ToolboxError) {
 	mock := []any{t.Name}
 	return mock, nil
 }

internal/server/mcp.go

@@ -23,7 +23,6 @@ import (
 	"fmt"
 	"io"
 	"net/http"
-	"strings"
 	"sync"
 	"time"
 
@@ -444,15 +443,17 @@ func httpHandler(s *Server, w http.ResponseWriter, r *http.Request) {
 		code := rpcResponse.Error.Code
 		switch code {
 		case jsonrpc.INTERNAL_ERROR:
+			// Map Internal RPC Error (-32603) to HTTP 500
 			w.WriteHeader(http.StatusInternalServerError)
 		case jsonrpc.INVALID_REQUEST:
-			errStr := err.Error()
-			if errors.Is(err, util.ErrUnauthorized) {
-				w.WriteHeader(http.StatusUnauthorized)
-			} else if strings.Contains(errStr, "Error 401") {
-				w.WriteHeader(http.StatusUnauthorized)
-			} else if strings.Contains(errStr, "Error 403") {
-				w.WriteHeader(http.StatusForbidden)
+			var clientServerErr *util.ClientServerError
+			if errors.As(err, &clientServerErr) {
+				switch clientServerErr.Code {
+				case http.StatusUnauthorized:
+					w.WriteHeader(http.StatusUnauthorized)
+				case http.StatusForbidden:
+					w.WriteHeader(http.StatusForbidden)
+				}
 			}
 		}
 	}

internal/server/mcp/v20241105/method.go

@@ -21,7 +21,6 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/googleapis/genai-toolbox/internal/prompts"
 	"github.com/googleapis/genai-toolbox/internal/server/mcp/jsonrpc"
@@ -124,7 +123,11 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	}
 	if clientAuth {
 		if accessToken == "" {
-			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, "missing access token in the 'Authorization' header", nil), util.ErrUnauthorized
+			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, "missing access token in the 'Authorization' header", nil), util.NewClientServerError(
+				"missing access token in the 'Authorization' header",
+				http.StatusUnauthorized,
+				nil,
+			)
 		}
 	}
 
@@ -172,7 +175,11 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	// Check if any of the specified auth services is verified
 	isAuthorized := tool.Authorized(verifiedAuthServices)
 	if !isAuthorized {
-		err = fmt.Errorf("unauthorized Tool call: Please make sure your specify correct auth headers: %w", util.ErrUnauthorized)
+		err = util.NewClientServerError(
+			"unauthorized Tool call: Please make sure you specify correct auth headers",
+			http.StatusUnauthorized,
+			nil,
+		)
 		return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
 	}
 	logger.DebugContext(ctx, "tool invocation authorized")
@@ -194,30 +201,44 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	// run tool invocation and generate response.
 	results, err := tool.Invoke(ctx, resourceMgr, params, accessToken)
 	if err != nil {
-		errStr := err.Error()
-		// Missing authService tokens.
-		if errors.Is(err, util.ErrUnauthorized) {
-			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
-		}
-		// Upstream auth error
-		if strings.Contains(errStr, "Error 401") || strings.Contains(errStr, "Error 403") {
-			if clientAuth {
-				// Error with client credentials should pass down to the client
-				return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
+		var tbErr util.ToolboxError
+
+		if errors.As(err, &tbErr) {
+			switch tbErr.Category() {
+			case util.CategoryAgent:
+				// MCP - Tool execution error
+				// Return SUCCESS but with IsError: true
+				text := TextContent{
+					Type: "text",
+					Text: err.Error(),
+				}
+				return jsonrpc.JSONRPCResponse{
+					Jsonrpc: jsonrpc.JSONRPC_VERSION,
+					Id:      id,
+					Result:  CallToolResult{Content: []TextContent{text}, IsError: true},
+				}, nil
+
+			case util.CategoryServer:
+				// MCP Spec - Protocol error
+				// Return JSON-RPC ERROR
+				var clientServerErr *util.ClientServerError
+				rpcCode := jsonrpc.INTERNAL_ERROR // Default to Internal Error (-32603)
+
+				if errors.As(err, &clientServerErr) {
+					if clientServerErr.Code == http.StatusUnauthorized || clientServerErr.Code == http.StatusForbidden {
+						if clientAuth {
+							rpcCode = jsonrpc.INVALID_REQUEST
+						} else {
+							rpcCode = jsonrpc.INTERNAL_ERROR
+						}
+					}
+				}
+				return jsonrpc.NewError(id, rpcCode, err.Error(), nil), err
 			}
-			// Auth error with ADC should raise internal 500 error
+		} else {
+			// Unknown error -> 500
 			return jsonrpc.NewError(id, jsonrpc.INTERNAL_ERROR, err.Error(), nil), err
 		}
-
-		text := TextContent{
-			Type: "text",
-			Text: err.Error(),
-		}
-		return jsonrpc.JSONRPCResponse{
-			Jsonrpc: jsonrpc.JSONRPC_VERSION,
-			Id:      id,
-			Result:  CallToolResult{Content: []TextContent{text}, IsError: true},
-		}, nil
 	}
 
 	content := make([]TextContent, 0)

internal/server/mcp/v20250326/method.go

@@ -21,7 +21,6 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/googleapis/genai-toolbox/internal/prompts"
 	"github.com/googleapis/genai-toolbox/internal/server/mcp/jsonrpc"
@@ -124,7 +123,11 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	}
 	if clientAuth {
 		if accessToken == "" {
-			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, "missing access token in the 'Authorization' header", nil), util.ErrUnauthorized
+			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, "missing access token in the 'Authorization' header", nil), util.NewClientServerError(
+				"missing access token in the 'Authorization' header",
+				http.StatusUnauthorized,
+				nil,
+			)
 		}
 	}
 
@@ -172,7 +175,11 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	// Check if any of the specified auth services is verified
 	isAuthorized := tool.Authorized(verifiedAuthServices)
 	if !isAuthorized {
-		err = fmt.Errorf("unauthorized Tool call: Please make sure your specify correct auth headers: %w", util.ErrUnauthorized)
+		err = util.NewClientServerError(
+			"unauthorized Tool call: Please make sure you specify correct auth headers",
+			http.StatusUnauthorized,
+			nil,
+		)
 		return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
 	}
 	logger.DebugContext(ctx, "tool invocation authorized")
@@ -194,31 +201,45 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	// run tool invocation and generate response.
 	results, err := tool.Invoke(ctx, resourceMgr, params, accessToken)
 	if err != nil {
-		errStr := err.Error()
-		// Missing authService tokens.
-		if errors.Is(err, util.ErrUnauthorized) {
-			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
-		}
-		// Upstream auth error
-		if strings.Contains(errStr, "Error 401") || strings.Contains(errStr, "Error 403") {
-			if clientAuth {
-				// Error with client credentials should pass down to the client
-				return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
+		var tbErr util.ToolboxError
+
+		if errors.As(err, &tbErr) {
+			switch tbErr.Category() {
+			case util.CategoryAgent:
+				// MCP - Tool execution error
+				// Return SUCCESS but with IsError: true
+				text := TextContent{
+					Type: "text",
+					Text: err.Error(),
+				}
+				return jsonrpc.JSONRPCResponse{
+					Jsonrpc: jsonrpc.JSONRPC_VERSION,
+					Id:      id,
+					Result:  CallToolResult{Content: []TextContent{text}, IsError: true},
+				}, nil
+
+			case util.CategoryServer:
+				// MCP Spec - Protocol error
+				// Return JSON-RPC ERROR
+				var clientServerErr *util.ClientServerError
+				rpcCode := jsonrpc.INTERNAL_ERROR // Default to Internal Error (-32603)
+
+				if errors.As(err, &clientServerErr) {
+					if clientServerErr.Code == http.StatusUnauthorized || clientServerErr.Code == http.StatusForbidden {
+						if clientAuth {
+							rpcCode = jsonrpc.INVALID_REQUEST
+						} else {
+							rpcCode = jsonrpc.INTERNAL_ERROR
+						}
+					}
+				}
+				return jsonrpc.NewError(id, rpcCode, err.Error(), nil), err
 			}
-			// Auth error with ADC should raise internal 500 error
+		} else {
+			// Unknown error -> 500
 			return jsonrpc.NewError(id, jsonrpc.INTERNAL_ERROR, err.Error(), nil), err
 		}
-		text := TextContent{
-			Type: "text",
-			Text: err.Error(),
-		}
-		return jsonrpc.JSONRPCResponse{
-			Jsonrpc: jsonrpc.JSONRPC_VERSION,
-			Id:      id,
-			Result:  CallToolResult{Content: []TextContent{text}, IsError: true},
-		}, nil
 	}
-
 	content := make([]TextContent, 0)
 
 	sliceRes, ok := results.([]any)

internal/server/mcp/v20250618/method.go

@@ -21,7 +21,6 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/googleapis/genai-toolbox/internal/prompts"
 	"github.com/googleapis/genai-toolbox/internal/server/mcp/jsonrpc"
@@ -117,7 +116,12 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	}
 	if clientAuth {
 		if accessToken == "" {
-			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, "missing access token in the 'Authorization' header", nil), util.ErrUnauthorized
+			errMsg := "missing access token in the 'Authorization' header"
+			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, errMsg, nil), util.NewClientServerError(
+				errMsg,
+				http.StatusUnauthorized,
+				nil,
+			)
 		}
 	}
 
@@ -165,7 +169,11 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	// Check if any of the specified auth services is verified
 	isAuthorized := tool.Authorized(verifiedAuthServices)
 	if !isAuthorized {
-		err = fmt.Errorf("unauthorized Tool call: Please make sure your specify correct auth headers: %w", util.ErrUnauthorized)
+		err = util.NewClientServerError(
+			"unauthorized Tool call: Please make sure you specify correct auth headers",
+			http.StatusUnauthorized,
+			nil,
+		)
 		return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
 	}
 	logger.DebugContext(ctx, "tool invocation authorized")
@@ -187,29 +195,44 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	// run tool invocation and generate response.
 	results, err := tool.Invoke(ctx, resourceMgr, params, accessToken)
 	if err != nil {
-		errStr := err.Error()
-		// Missing authService tokens.
-		if errors.Is(err, util.ErrUnauthorized) {
-			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
-		}
-		// Upstream auth error
-		if strings.Contains(errStr, "Error 401") || strings.Contains(errStr, "Error 403") {
-			if clientAuth {
-				// Error with client credentials should pass down to the client
-				return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
+		var tbErr util.ToolboxError
+
+		if errors.As(err, &tbErr) {
+			switch tbErr.Category() {
+			case util.CategoryAgent:
+				// MCP - Tool execution error
+				// Return SUCCESS but with IsError: true
+				text := TextContent{
+					Type: "text",
+					Text: err.Error(),
+				}
+				return jsonrpc.JSONRPCResponse{
+					Jsonrpc: jsonrpc.JSONRPC_VERSION,
+					Id:      id,
+					Result:  CallToolResult{Content: []TextContent{text}, IsError: true},
+				}, nil
+
+			case util.CategoryServer:
+				// MCP Spec - Protocol error
+				// Return JSON-RPC ERROR
+				var clientServerErr *util.ClientServerError
+				rpcCode := jsonrpc.INTERNAL_ERROR // Default to Internal Error (-32603)
+
+				if errors.As(err, &clientServerErr) {
+					if clientServerErr.Code == http.StatusUnauthorized || clientServerErr.Code == http.StatusForbidden {
+						if clientAuth {
+							rpcCode = jsonrpc.INVALID_REQUEST
+						} else {
+							rpcCode = jsonrpc.INTERNAL_ERROR
+						}
+					}
+				}
+				return jsonrpc.NewError(id, rpcCode, err.Error(), nil), err
 			}
-			// Auth error with ADC should raise internal 500 error
+		} else {
+			// Unknown error -> 500
 			return jsonrpc.NewError(id, jsonrpc.INTERNAL_ERROR, err.Error(), nil), err
 		}
-		text := TextContent{
-			Type: "text",
-			Text: err.Error(),
-		}
-		return jsonrpc.JSONRPCResponse{
-			Jsonrpc: jsonrpc.JSONRPC_VERSION,
-			Id:      id,
-			Result:  CallToolResult{Content: []TextContent{text}, IsError: true},
-		}, nil
 	}
 
 	content := make([]TextContent, 0)

internal/server/mcp/v20251125/method.go

@@ -21,7 +21,6 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/googleapis/genai-toolbox/internal/prompts"
 	"github.com/googleapis/genai-toolbox/internal/server/mcp/jsonrpc"
@@ -117,7 +116,11 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	}
 	if clientAuth {
 		if accessToken == "" {
-			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, "missing access token in the 'Authorization' header", nil), util.ErrUnauthorized
+			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, "missing access token in the 'Authorization' header", nil), util.NewClientServerError(
+				"missing access token in the 'Authorization' header",
+				http.StatusUnauthorized,
+				nil,
+			)
 		}
 	}
 
@@ -165,7 +168,11 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	// Check if any of the specified auth services is verified
 	isAuthorized := tool.Authorized(verifiedAuthServices)
 	if !isAuthorized {
-		err = fmt.Errorf("unauthorized Tool call: Please make sure your specify correct auth headers: %w", util.ErrUnauthorized)
+		err = util.NewClientServerError(
+			"unauthorized Tool call: Please make sure you specify correct auth headers",
+			http.StatusUnauthorized,
+			nil,
+		)
 		return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
 	}
 	logger.DebugContext(ctx, "tool invocation authorized")
@@ -187,29 +194,44 @@ func toolsCallHandler(ctx context.Context, id jsonrpc.RequestId, resourceMgr *re
 	// run tool invocation and generate response.
 	results, err := tool.Invoke(ctx, resourceMgr, params, accessToken)
 	if err != nil {
-		errStr := err.Error()
-		// Missing authService tokens.
-		if errors.Is(err, util.ErrUnauthorized) {
-			return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
-		}
-		// Upstream auth error
-		if strings.Contains(errStr, "Error 401") || strings.Contains(errStr, "Error 403") {
-			if clientAuth {
-				// Error with client credentials should pass down to the client
-				return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
+		var tbErr util.ToolboxError
+
+		if errors.As(err, &tbErr) {
+			switch tbErr.Category() {
+			case util.CategoryAgent:
+				// MCP - Tool execution error
+				// Return SUCCESS but with IsError: true
+				text := TextContent{
+					Type: "text",
+					Text: err.Error(),
+				}
+				return jsonrpc.JSONRPCResponse{
+					Jsonrpc: jsonrpc.JSONRPC_VERSION,
+					Id:      id,
+					Result:  CallToolResult{Content: []TextContent{text}, IsError: true},
+				}, nil
+
+			case util.CategoryServer:
+				// MCP Spec - Protocol error
+				// Return JSON-RPC ERROR
+				var clientServerErr *util.ClientServerError
+				rpcCode := jsonrpc.INTERNAL_ERROR // Default to Internal Error (-32603)
+
+				if errors.As(err, &clientServerErr) {
+					if clientServerErr.Code == http.StatusUnauthorized || clientServerErr.Code == http.StatusForbidden {
+						if clientAuth {
+							rpcCode = jsonrpc.INVALID_REQUEST
+						} else {
+							rpcCode = jsonrpc.INTERNAL_ERROR
+						}
+					}
+				}
+				return jsonrpc.NewError(id, rpcCode, err.Error(), nil), err
 			}
-			// Auth error with ADC should raise internal 500 error
+		} else {
+			// Unknown error -> 500
 			return jsonrpc.NewError(id, jsonrpc.INTERNAL_ERROR, err.Error(), nil), err
 		}
-		text := TextContent{
-			Type: "text",
-			Text: err.Error(),
-		}
-		return jsonrpc.JSONRPCResponse{
-			Jsonrpc: jsonrpc.JSONRPC_VERSION,
-			Id:      id,
-			Result:  CallToolResult{Content: []TextContent{text}, IsError: true},
-		}, nil
 	}
 
 	content := make([]TextContent, 0)

internal/tools/alloydb/alloydbcreatecluster/alloydbcreatecluster.go

@@ -22,6 +22,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -122,44 +123,49 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", 500, err)
 	}
 
 	paramsMap := params.AsMap()
 	project, ok := paramsMap["project"].(string)
 	if !ok || project == "" {
-		return nil, fmt.Errorf("invalid or missing 'project' parameter; expected a non-empty string")
+		return nil, util.NewAgentError("invalid or missing 'project' parameter; expected a non-empty string", nil)
 	}
 
 	location, ok := paramsMap["location"].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid 'location' parameter; expected a string")
+		return nil, util.NewAgentError("invalid 'location' parameter; expected a string", nil)
 	}
 
 	clusterID, ok := paramsMap["cluster"].(string)
 	if !ok || clusterID == "" {
-		return nil, fmt.Errorf("invalid or missing 'cluster' parameter; expected a non-empty string")
+		return nil, util.NewAgentError("invalid or missing 'cluster' parameter; expected a non-empty string", nil)
 	}
 
 	password, ok := paramsMap["password"].(string)
 	if !ok || password == "" {
-		return nil, fmt.Errorf("invalid or missing 'password' parameter; expected a non-empty string")
+		return nil, util.NewAgentError("invalid or missing 'password' parameter; expected a non-empty string", nil)
 	}
 
 	network, ok := paramsMap["network"].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid 'network' parameter; expected a string")
+		return nil, util.NewAgentError("invalid 'network' parameter; expected a string", nil)
 	}
 
 	user, ok := paramsMap["user"].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid 'user' parameter; expected a string")
+		return nil, util.NewAgentError("invalid 'user' parameter; expected a string", nil)
+	}
+	resp, err := source.CreateCluster(ctx, project, location, network, user, password, clusterID, string(accessToken))
+
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
 	}
 
-	return source.CreateCluster(ctx, project, location, network, user, password, clusterID, string(accessToken))
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/alloydb/alloydbcreateinstance/alloydbcreateinstance.go

@@ -22,6 +22,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -123,36 +124,36 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", 500, err)
 	}
 
 	paramsMap := params.AsMap()
 	project, ok := paramsMap["project"].(string)
 	if !ok || project == "" {
-		return nil, fmt.Errorf("invalid or missing 'project' parameter; expected a non-empty string")
+		return nil, util.NewAgentError("invalid or missing 'project' parameter; expected a non-empty string", nil)
 	}
 
 	location, ok := paramsMap["location"].(string)
 	if !ok || location == "" {
-		return nil, fmt.Errorf("invalid or missing 'location' parameter; expected a non-empty string")
+		return nil, util.NewAgentError("invalid or missing 'location' parameter; expected a non-empty string", nil)
 	}
 
 	cluster, ok := paramsMap["cluster"].(string)
 	if !ok || cluster == "" {
-		return nil, fmt.Errorf("invalid or missing 'cluster' parameter; expected a non-empty string")
+		return nil, util.NewAgentError("invalid or missing 'cluster' parameter; expected a non-empty string", nil)
 	}
 
 	instanceID, ok := paramsMap["instance"].(string)
 	if !ok || instanceID == "" {
-		return nil, fmt.Errorf("invalid or missing 'instance' parameter; expected a non-empty string")
+		return nil, util.NewAgentError("invalid or missing 'instance' parameter; expected a non-empty string", nil)
 	}
 
 	instanceType, ok := paramsMap["instanceType"].(string)
 	if !ok || (instanceType != "READ_POOL" && instanceType != "PRIMARY") {
-		return nil, fmt.Errorf("invalid 'instanceType' parameter; expected 'PRIMARY' or 'READ_POOL'")
+		return nil, util.NewAgentError("invalid 'instanceType' parameter; expected 'PRIMARY' or 'READ_POOL'", nil)
 	}
 
 	displayName, _ := paramsMap["displayName"].(string)
@@ -161,11 +162,15 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if instanceType == "READ_POOL" {
 		nodeCount, ok = paramsMap["nodeCount"].(int)
 		if !ok {
-			return nil, fmt.Errorf("invalid 'nodeCount' parameter; expected an integer for READ_POOL")
+			return nil, util.NewAgentError("invalid 'nodeCount' parameter; expected an integer for READ_POOL", nil)
 		}
 	}
 
-	return source.CreateInstance(ctx, project, location, cluster, instanceID, instanceType, displayName, nodeCount, string(accessToken))
+	resp, err := source.CreateInstance(ctx, project, location, cluster, instanceID, instanceType, displayName, nodeCount, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/alloydb/alloydbcreateuser/alloydbcreateuser.go

@@ -22,6 +22,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -122,43 +123,43 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", 500, err)
 	}
 
 	paramsMap := params.AsMap()
 	project, ok := paramsMap["project"].(string)
 	if !ok || project == "" {
-		return nil, fmt.Errorf("invalid or missing 'project' parameter; expected a non-empty string")
+		return nil, util.NewAgentError("invalid or missing 'project' parameter; expected a non-empty string", nil)
 	}
 
 	location, ok := paramsMap["location"].(string)
 	if !ok || location == "" {
-		return nil, fmt.Errorf("invalid or missing'location' parameter; expected a non-empty string")
+		return nil, util.NewAgentError("invalid or missing'location' parameter; expected a non-empty string", nil)
 	}
 
 	cluster, ok := paramsMap["cluster"].(string)
 	if !ok || cluster == "" {
-		return nil, fmt.Errorf("invalid or missing 'cluster' parameter; expected a non-empty string")
+		return nil, util.NewAgentError("invalid or missing 'cluster' parameter; expected a non-empty string", nil)
 	}
 
 	userID, ok := paramsMap["user"].(string)
 	if !ok || userID == "" {
-		return nil, fmt.Errorf("invalid or missing 'user' parameter; expected a non-empty string")
+		return nil, util.NewAgentError("invalid or missing 'user' parameter; expected a non-empty string", nil)
 	}
 
 	userType, ok := paramsMap["userType"].(string)
 	if !ok || (userType != "ALLOYDB_BUILT_IN" && userType != "ALLOYDB_IAM_USER") {
-		return nil, fmt.Errorf("invalid or missing 'userType' parameter; expected 'ALLOYDB_BUILT_IN' or 'ALLOYDB_IAM_USER'")
+		return nil, util.NewAgentError("invalid or missing 'userType' parameter; expected 'ALLOYDB_BUILT_IN' or 'ALLOYDB_IAM_USER'", nil)
 	}
 	var password string
 
 	if userType == "ALLOYDB_BUILT_IN" {
 		password, ok = paramsMap["password"].(string)
 		if !ok || password == "" {
-			return nil, fmt.Errorf("password is required when userType is ALLOYDB_BUILT_IN")
+			return nil, util.NewAgentError("password is required when userType is ALLOYDB_BUILT_IN", nil)
 		}
 	}
 
@@ -170,7 +171,11 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			}
 		}
 	}
-	return source.CreateUser(ctx, userType, password, roles, string(accessToken), project, location, cluster, userID)
+	resp, err := source.CreateUser(ctx, userType, password, roles, string(accessToken), project, location, cluster, userID)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/alloydb/alloydbgetcluster/alloydbgetcluster.go

@@ -22,6 +22,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -120,28 +121,32 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", 500, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid or missing 'project' parameter; expected a string")
+	if !ok || project == "" {
+		return nil, util.NewAgentError("invalid or missing 'project' parameter; expected a string", nil)
 	}
 	location, ok := paramsMap["location"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid 'location' parameter; expected a string")
+	if !ok || location == "" {
+		return nil, util.NewAgentError("invalid or missing 'location' parameter; expected a string", nil)
 	}
 	cluster, ok := paramsMap["cluster"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid 'cluster' parameter; expected a string")
+	if !ok || cluster == "" {
+		return nil, util.NewAgentError("invalid or missing 'cluster' parameter; expected a string", nil)
 	}
 
-	return source.GetCluster(ctx, project, location, cluster, string(accessToken))
+	resp, err := source.GetCluster(ctx, project, location, cluster, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/alloydb/alloydbgetinstance/alloydbgetinstance.go

@@ -22,6 +22,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -120,32 +121,36 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", 500, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid or missing 'project' parameter; expected a string")
+	if !ok || project == "" {
+		return nil, util.NewAgentError("invalid or missing 'project' parameter; expected a string", nil)
 	}
 	location, ok := paramsMap["location"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid 'location' parameter; expected a string")
+	if !ok || location == "" {
+		return nil, util.NewAgentError("invalid or missing 'location' parameter; expected a string", nil)
 	}
 	cluster, ok := paramsMap["cluster"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid 'cluster' parameter; expected a string")
+	if !ok || cluster == "" {
+		return nil, util.NewAgentError("invalid or missing 'cluster' parameter; expected a string", nil)
 	}
 	instance, ok := paramsMap["instance"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid 'instance' parameter; expected a string")
+	if !ok || instance == "" {
+		return nil, util.NewAgentError("invalid or missing 'instance' parameter; expected a string", nil)
 	}
 
-	return source.GetInstance(ctx, project, location, cluster, instance, string(accessToken))
+	resp, err := source.GetInstance(ctx, project, location, cluster, instance, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/alloydb/alloydbgetuser/alloydbgetuser.go

@@ -22,6 +22,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -120,32 +121,36 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", 500, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid or missing 'project' parameter; expected a string")
+	if !ok || project == "" {
+		return nil, util.NewAgentError("invalid or missing 'project' parameter; expected a string", nil)
 	}
 	location, ok := paramsMap["location"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid 'location' parameter; expected a string")
+	if !ok || location == "" {
+		return nil, util.NewAgentError("invalid or missing 'location' parameter; expected a string", nil)
 	}
 	cluster, ok := paramsMap["cluster"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid 'cluster' parameter; expected a string")
+	if !ok || cluster == "" {
+		return nil, util.NewAgentError("invalid or missing 'cluster' parameter; expected a string", nil)
 	}
 	user, ok := paramsMap["user"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid 'user' parameter; expected a string")
+	if !ok || user == "" {
+		return nil, util.NewAgentError("invalid or missing 'user' parameter; expected a string", nil)
 	}
 
-	return source.GetUsers(ctx, project, location, cluster, user, string(accessToken))
+	resp, err := source.GetUsers(ctx, project, location, cluster, user, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/alloydb/alloydblistclusters/alloydblistclusters.go

@@ -22,6 +22,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -118,24 +119,28 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", 500, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid or missing 'project' parameter; expected a string")
+	if !ok || project == "" {
+		return nil, util.NewAgentError("invalid or missing 'project' parameter; expected a string", nil)
 	}
 	location, ok := paramsMap["location"].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid 'location' parameter; expected a string")
+		return nil, util.NewAgentError("invalid 'location' parameter; expected a string", nil)
 	}
 
-	return source.ListCluster(ctx, project, location, string(accessToken))
+	resp, err := source.ListCluster(ctx, project, location, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/alloydb/alloydblistinstances/alloydblistinstances.go

@@ -22,6 +22,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -119,28 +120,32 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", 500, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid or missing 'project' parameter; expected a string")
+	if !ok || project == "" {
+		return nil, util.NewAgentError("invalid or missing 'project' parameter; expected a string", nil)
 	}
 	location, ok := paramsMap["location"].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid 'location' parameter; expected a string")
+		return nil, util.NewAgentError("invalid 'location' parameter; expected a string", nil)
 	}
 	cluster, ok := paramsMap["cluster"].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid 'cluster' parameter; expected a string")
+		return nil, util.NewAgentError("invalid 'cluster' parameter; expected a string", nil)
 	}
 
-	return source.ListInstance(ctx, project, location, cluster, string(accessToken))
+	resp, err := source.ListInstance(ctx, project, location, cluster, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/alloydb/alloydblistusers/alloydblistusers.go

@@ -22,6 +22,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -119,28 +120,32 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", 500, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid or missing 'project' parameter; expected a string")
+	if !ok || project == "" {
+		return nil, util.NewAgentError("invalid or missing 'project' parameter; expected a string", nil)
 	}
 	location, ok := paramsMap["location"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid 'location' parameter; expected a string")
+	if !ok || location == "" {
+		return nil, util.NewAgentError("invalid or missing 'location' parameter; expected a string", nil)
 	}
 	cluster, ok := paramsMap["cluster"].(string)
-	if !ok {
-		return nil, fmt.Errorf("invalid 'cluster' parameter; expected a string")
+	if !ok || cluster == "" {
+		return nil, util.NewAgentError("invalid or missing 'cluster' parameter; expected a string", nil)
 	}
 
-	return source.ListUsers(ctx, project, location, cluster, string(accessToken))
+	resp, err := source.ListUsers(ctx, project, location, cluster, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/alloydb/alloydbwaitforoperation/alloydbwaitforoperation.go

@@ -24,6 +24,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -213,25 +214,25 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", 500, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'project' parameter")
+		return nil, util.NewAgentError("missing 'project' parameter", nil)
 	}
 	location, ok := paramsMap["location"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'location' parameter")
+		return nil, util.NewAgentError("missing 'location' parameter", nil)
 	}
 	operation, ok := paramsMap["operation"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'operation' parameter")
+		return nil, util.NewAgentError("missing 'operation' parameter", nil)
 	}
 
 	ctx, cancel := context.WithTimeout(ctx, 30*time.Minute)
@@ -246,14 +247,15 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	for retries < maxRetries {
 		select {
 		case <-ctx.Done():
-			return nil, fmt.Errorf("timed out waiting for operation: %w", ctx.Err())
+			return nil, util.NewAgentError("timed out waiting for operation %s", ctx.Err())
 		default:
 		}
 
 		op, err := source.GetOperations(ctx, project, location, operation, alloyDBConnectionMessageTemplate, delay, string(accessToken))
 		if err != nil {
-			return nil, err
-		} else if op != nil {
+			return nil, util.ProecessGcpError(err)
+		}
+		if op != nil {
 			return op, nil
 		}
 
@@ -264,7 +266,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 		}
 		retries++
 	}
-	return nil, fmt.Errorf("exceeded max retries waiting for operation")
+	return nil, util.NewAgentError("exceeded max retries waiting for operation", nil)
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/alloydbainl/alloydbainl.go

@@ -17,12 +17,14 @@ package alloydbainl
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"strings"
 
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"github.com/jackc/pgx/v5/pgxpool"
 )
@@ -127,10 +129,10 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	sliceParams := params.AsSlice()
@@ -143,7 +145,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 
 	resp, err := source.RunSQL(ctx, t.Statement, allParamValues)
 	if err != nil {
-		return nil, fmt.Errorf("%w. Query: %v , Values: %v. Toolbox v0.19.0+ is only compatible with AlloyDB AI NL v1.0.3+. Please ensure that you are using the latest AlloyDB AI NL extension", err, t.Statement, allParamValues)
+		return nil, util.NewClientServerError(fmt.Sprintf("error running SQL query: %v. Query: %v , Values: %v. Toolbox v0.19.0+ is only compatible with AlloyDB AI NL v1.0.3+. Please ensure that you are using the latest AlloyDB AI NL extension", err, t.Statement, allParamValues), http.StatusBadRequest, err)
 	}
 	return resp, nil
 }

internal/tools/bigquery/bigqueryanalyzecontribution/bigqueryanalyzecontribution.go

@@ -17,6 +17,7 @@ package bigqueryanalyzecontribution
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"strings"
 
 	bigqueryapi "cloud.google.com/go/bigquery"
@@ -27,6 +28,7 @@ import (
 	bigqueryds "github.com/googleapis/genai-toolbox/internal/sources/bigquery"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	bqutil "github.com/googleapis/genai-toolbox/internal/tools/bigquery/bigquerycommon"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	bigqueryrestapi "google.golang.org/api/bigquery/v2"
 )
@@ -154,21 +156,21 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke runs the contribution analysis.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 	inputData, ok := paramsMap["input_data"].(string)
 	if !ok {
-		return nil, fmt.Errorf("unable to cast input_data parameter %s", paramsMap["input_data"])
+		return nil, util.NewAgentError(fmt.Sprintf("unable to cast input_data parameter %s", paramsMap["input_data"]), nil)
 	}
 
 	bqClient, restService, err := source.RetrieveClientAndService(accessToken)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("failed to retrieve BigQuery client", http.StatusInternalServerError, err)
 	}
 
 	modelID := fmt.Sprintf("contribution_analysis_model_%s", strings.ReplaceAll(uuid.New().String(), "-", ""))
@@ -186,7 +188,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			}
 			options = append(options, fmt.Sprintf("DIMENSION_ID_COLS = [%s]", strings.Join(strCols, ", ")))
 		} else {
-			return nil, fmt.Errorf("unable to cast dimension_id_cols parameter %s", paramsMap["dimension_id_cols"])
+			return nil, util.NewAgentError(fmt.Sprintf("unable to cast dimension_id_cols parameter %s", paramsMap["dimension_id_cols"]), nil)
 		}
 	}
 	if val, ok := paramsMap["top_k_insights_by_apriori_support"]; ok {
@@ -195,7 +197,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if val, ok := paramsMap["pruning_method"].(string); ok {
 		upperVal := strings.ToUpper(val)
 		if upperVal != "NO_PRUNING" && upperVal != "PRUNE_REDUNDANT_INSIGHTS" {
-			return nil, fmt.Errorf("invalid pruning_method: %s", val)
+			return nil, util.NewAgentError(fmt.Sprintf("invalid pruning_method: %s", val), nil)
 		}
 		options = append(options, fmt.Sprintf("PRUNING_METHOD = '%s'", upperVal))
 	}
@@ -207,7 +209,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			var connProps []*bigqueryapi.ConnectionProperty
 			session, err := source.BigQuerySession()(ctx)
 			if err != nil {
-				return nil, fmt.Errorf("failed to get BigQuery session: %w", err)
+				return nil, util.NewClientServerError("failed to get BigQuery session", http.StatusInternalServerError, err)
 			}
 			if session != nil {
 				connProps = []*bigqueryapi.ConnectionProperty{
@@ -216,22 +218,22 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			}
 			dryRunJob, err := bqutil.DryRunQuery(ctx, restService, source.BigQueryClient().Project(), source.BigQueryClient().Location, inputData, nil, connProps)
 			if err != nil {
-				return nil, fmt.Errorf("query validation failed: %w", err)
+				return nil, util.ProecessGcpError(err)
 			}
 			statementType := dryRunJob.Statistics.Query.StatementType
 			if statementType != "SELECT" {
-				return nil, fmt.Errorf("the 'input_data' parameter only supports a table ID or a SELECT query. The provided query has statement type '%s'", statementType)
+				return nil, util.NewAgentError(fmt.Sprintf("the 'input_data' parameter only supports a table ID or a SELECT query. The provided query has statement type '%s'", statementType), nil)
 			}
 
 			queryStats := dryRunJob.Statistics.Query
 			if queryStats != nil {
 				for _, tableRef := range queryStats.ReferencedTables {
 					if !source.IsDatasetAllowed(tableRef.ProjectId, tableRef.DatasetId) {
-						return nil, fmt.Errorf("query in input_data accesses dataset '%s.%s', which is not in the allowed list", tableRef.ProjectId, tableRef.DatasetId)
+						return nil, util.NewAgentError(fmt.Sprintf("query in input_data accesses dataset '%s.%s', which is not in the allowed list", tableRef.ProjectId, tableRef.DatasetId), nil)
 					}
 				}
 			} else {
-				return nil, fmt.Errorf("could not analyze query in input_data to validate against allowed datasets")
+				return nil, util.NewAgentError("could not analyze query in input_data to validate against allowed datasets", nil)
 			}
 		}
 		inputDataSource = fmt.Sprintf("(%s)", inputData)
@@ -245,10 +247,10 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			case 2: // dataset.table
 				projectID, datasetID = source.BigQueryClient().Project(), parts[0]
 			default:
-				return nil, fmt.Errorf("invalid table ID format for 'input_data': %q. Expected 'dataset.table' or 'project.dataset.table'", inputData)
+				return nil, util.NewAgentError(fmt.Sprintf("invalid table ID format for 'input_data': %q. Expected 'dataset.table' or 'project.dataset.table'", inputData), nil)
 			}
 			if !source.IsDatasetAllowed(projectID, datasetID) {
-				return nil, fmt.Errorf("access to dataset '%s.%s' (from table '%s') is not allowed", projectID, datasetID, inputData)
+				return nil, util.NewAgentError(fmt.Sprintf("access to dataset '%s.%s' (from table '%s') is not allowed", projectID, datasetID, inputData), nil)
 			}
 		}
 		inputDataSource = fmt.Sprintf("SELECT * FROM `%s`", inputData)
@@ -268,7 +270,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	// Otherwise, a new session will be created by the first query.
 	session, err := source.BigQuerySession()(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("failed to get BigQuery session: %w", err)
+		return nil, util.NewClientServerError("failed to get BigQuery session", http.StatusInternalServerError, err)
 	}
 
 	if session != nil {
@@ -281,15 +283,15 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	}
 	createModelJob, err := createModelQuery.Run(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("failed to start create model job: %w", err)
+		return nil, util.ProecessGcpError(err)
 	}
 
 	status, err := createModelJob.Wait(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("failed to wait for create model job: %w", err)
+		return nil, util.ProecessGcpError(err)
 	}
 	if err := status.Err(); err != nil {
-		return nil, fmt.Errorf("create model job failed: %w", err)
+		return nil, util.ProecessGcpError(err)
 	}
 
 	// Determine the session ID to use for subsequent queries.
@@ -300,12 +302,17 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	} else if status.Statistics != nil && status.Statistics.SessionInfo != nil {
 		sessionID = status.Statistics.SessionInfo.SessionID
 	} else {
-		return nil, fmt.Errorf("failed to get or create a BigQuery session ID")
+		return nil, util.NewClientServerError("failed to get or create a BigQuery session ID", http.StatusInternalServerError, nil)
 	}
 
 	getInsightsSQL := fmt.Sprintf("SELECT * FROM ML.GET_INSIGHTS(MODEL %s)", modelID)
 	connProps := []*bigqueryapi.ConnectionProperty{{Key: "session_id", Value: sessionID}}
-	return source.RunSQL(ctx, bqClient, getInsightsSQL, "SELECT", nil, connProps)
+
+	resp, err := source.RunSQL(ctx, bqClient, getInsightsSQL, "SELECT", nil, connProps)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/bigquery/bigqueryconversationalanalytics/bigqueryconversationalanalytics.go

@@ -172,10 +172,10 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	var tokenStr string
@@ -184,26 +184,26 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if source.UseClientAuthorization() {
 		// Use client-side access token
 		if accessToken == "" {
-			return nil, fmt.Errorf("tool is configured for client OAuth but no token was provided in the request header: %w", util.ErrUnauthorized)
+			return nil, util.NewClientServerError("tool is configured for client OAuth but no token was provided in the request header", http.StatusUnauthorized, nil)
 		}
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	} else {
 		// Get a token source for the Gemini Data Analytics API.
 		tokenSource, err := source.BigQueryTokenSourceWithScope(ctx, nil)
 		if err != nil {
-			return nil, fmt.Errorf("failed to get token source: %w", err)
+			return nil, util.NewClientServerError("failed to get token source", http.StatusInternalServerError, err)
 		}
 
 		// Use cloud-platform token source for Gemini Data Analytics API
 		if tokenSource == nil {
-			return nil, fmt.Errorf("cloud-platform token source is missing")
+			return nil, util.NewClientServerError("cloud-platform token source is missing", http.StatusInternalServerError, nil)
 		}
 		token, err := tokenSource.Token()
 		if err != nil {
-			return nil, fmt.Errorf("failed to get token from cloud-platform token source: %w", err)
+			return nil, util.NewClientServerError("failed to get token from cloud-platform token source", http.StatusInternalServerError, err)
 		}
 		tokenStr = token.AccessToken
 	}
@@ -218,14 +218,14 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	var tableRefs []BQTableReference
 	if tableRefsJSON != "" {
 		if err := json.Unmarshal([]byte(tableRefsJSON), &tableRefs); err != nil {
-			return nil, fmt.Errorf("failed to parse 'table_references' JSON string: %w", err)
+			return nil, util.NewAgentError("failed to parse 'table_references' JSON string", err)
 		}
 	}
 
 	if len(source.BigQueryAllowedDatasets()) > 0 {
 		for _, tableRef := range tableRefs {
 			if !source.IsDatasetAllowed(tableRef.ProjectID, tableRef.DatasetID) {
-				return nil, fmt.Errorf("access to dataset '%s.%s' (from table '%s') is not allowed", tableRef.ProjectID, tableRef.DatasetID, tableRef.TableID)
+				return nil, util.NewAgentError(fmt.Sprintf("access to dataset '%s.%s' (from table '%s') is not allowed", tableRef.ProjectID, tableRef.DatasetID, tableRef.TableID), nil)
 			}
 		}
 	}
@@ -258,7 +258,8 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	// Call the streaming API
 	response, err := getStream(caURL, payload, headers, source.GetMaxQueryResultRows())
 	if err != nil {
-		return nil, fmt.Errorf("failed to get response from conversational analytics API: %w", err)
+		// getStream wraps network errors or non-200 responses
+		return nil, util.NewClientServerError("failed to get response from conversational analytics API", http.StatusInternalServerError, err)
 	}
 
 	return response, nil

internal/tools/bigquery/bigqueryexecutesql/bigqueryexecutesql.go

@@ -18,6 +18,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"net/http"
 	"strings"
 
 	bigqueryapi "cloud.google.com/go/bigquery"
@@ -152,25 +153,25 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 	sql, ok := paramsMap["sql"].(string)
 	if !ok {
-		return nil, fmt.Errorf("unable to cast sql parameter %s", paramsMap["sql"])
+		return nil, util.NewAgentError(fmt.Sprintf("unable to cast sql parameter %s", paramsMap["sql"]), nil)
 	}
 	dryRun, ok := paramsMap["dry_run"].(bool)
 	if !ok {
-		return nil, fmt.Errorf("unable to cast dry_run parameter %s", paramsMap["dry_run"])
+		return nil, util.NewAgentError(fmt.Sprintf("unable to cast dry_run parameter %s", paramsMap["dry_run"]), nil)
 	}
 
 	bqClient, restService, err := source.RetrieveClientAndService(accessToken)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("failed to retrieve BigQuery client", http.StatusInternalServerError, err)
 	}
 
 	var connProps []*bigqueryapi.ConnectionProperty
@@ -178,7 +179,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if source.BigQueryWriteMode() == bigqueryds.WriteModeProtected {
 		session, err = source.BigQuerySession()(ctx)
 		if err != nil {
-			return nil, fmt.Errorf("failed to get BigQuery session for protected mode: %w", err)
+			return nil, util.NewClientServerError("failed to get BigQuery session for protected mode", http.StatusInternalServerError, err)
 		}
 		connProps = []*bigqueryapi.ConnectionProperty{
 			{Key: "session_id", Value: session.ID},
@@ -187,7 +188,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 
 	dryRunJob, err := bqutil.DryRunQuery(ctx, restService, bqClient.Project(), bqClient.Location, sql, nil, connProps)
 	if err != nil {
-		return nil, fmt.Errorf("query validation failed: %w", err)
+		return nil, util.NewClientServerError("query validation failed", http.StatusInternalServerError, err)
 	}
 
 	statementType := dryRunJob.Statistics.Query.StatementType
@@ -195,13 +196,13 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	switch source.BigQueryWriteMode() {
 	case bigqueryds.WriteModeBlocked:
 		if statementType != "SELECT" {
-			return nil, fmt.Errorf("write mode is 'blocked', only SELECT statements are allowed")
+			return nil, util.NewAgentError("write mode is 'blocked', only SELECT statements are allowed", nil)
 		}
 	case bigqueryds.WriteModeProtected:
 		if dryRunJob.Configuration != nil && dryRunJob.Configuration.Query != nil {
 			if dest := dryRunJob.Configuration.Query.DestinationTable; dest != nil && dest.DatasetId != session.DatasetID {
-				return nil, fmt.Errorf("protected write mode only supports SELECT statements, or write operations in the anonymous "+
-					"dataset of a BigQuery session, but destination was %q", dest.DatasetId)
+				return nil, util.NewAgentError(fmt.Sprintf("protected write mode only supports SELECT statements, or write operations in the anonymous "+
+					"dataset of a BigQuery session, but destination was %q", dest.DatasetId), nil)
 			}
 		}
 	}
@@ -209,11 +210,11 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if len(source.BigQueryAllowedDatasets()) > 0 {
 		switch statementType {
 		case "CREATE_SCHEMA", "DROP_SCHEMA", "ALTER_SCHEMA":
-			return nil, fmt.Errorf("dataset-level operations like '%s' are not allowed when dataset restrictions are in place", statementType)
+			return nil, util.NewAgentError(fmt.Sprintf("dataset-level operations like '%s' are not allowed when dataset restrictions are in place", statementType), nil)
 		case "CREATE_FUNCTION", "CREATE_TABLE_FUNCTION", "CREATE_PROCEDURE":
-			return nil, fmt.Errorf("creating stored routines ('%s') is not allowed when dataset restrictions are in place, as their contents cannot be safely analyzed", statementType)
+			return nil, util.NewAgentError(fmt.Sprintf("creating stored routines ('%s') is not allowed when dataset restrictions are in place, as their contents cannot be safely analyzed", statementType), nil)
 		case "CALL":
-			return nil, fmt.Errorf("calling stored procedures ('%s') is not allowed when dataset restrictions are in place, as their contents cannot be safely analyzed", statementType)
+			return nil, util.NewAgentError(fmt.Sprintf("calling stored procedures ('%s') is not allowed when dataset restrictions are in place, as their contents cannot be safely analyzed", statementType), nil)
 		}
 
 		// Use a map to avoid duplicate table names.
@@ -244,7 +245,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			parsedTables, parseErr := bqutil.TableParser(sql, source.BigQueryClient().Project())
 			if parseErr != nil {
 				// If parsing fails (e.g., EXECUTE IMMEDIATE), we cannot guarantee safety, so we must fail.
-				return nil, fmt.Errorf("could not parse tables from query to validate against allowed datasets: %w", parseErr)
+				return nil, util.NewAgentError("could not parse tables from query to validate against allowed datasets", parseErr)
 			}
 			tableNames = parsedTables
 		}
@@ -254,7 +255,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			if len(parts) == 3 {
 				projectID, datasetID := parts[0], parts[1]
 				if !source.IsDatasetAllowed(projectID, datasetID) {
-					return nil, fmt.Errorf("query accesses dataset '%s.%s', which is not in the allowed list", projectID, datasetID)
+					return nil, util.NewAgentError(fmt.Sprintf("query accesses dataset '%s.%s', which is not in the allowed list", projectID, datasetID), nil)
 				}
 			}
 		}
@@ -264,7 +265,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 		if dryRunJob != nil {
 			jobJSON, err := json.MarshalIndent(dryRunJob, "", "  ")
 			if err != nil {
-				return nil, fmt.Errorf("failed to marshal dry run job to JSON: %w", err)
+				return nil, util.NewClientServerError("failed to marshal dry run job to JSON", http.StatusInternalServerError, err)
 			}
 			return string(jobJSON), nil
 		}
@@ -275,10 +276,14 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	// Log the query executed for debugging.
 	logger, err := util.LoggerFromContext(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("error getting logger: %s", err)
+		return nil, util.NewClientServerError("error getting logger", http.StatusInternalServerError, err)
 	}
 	logger.DebugContext(ctx, fmt.Sprintf("executing `%s` tool query: %s", resourceType, sql))
-	return source.RunSQL(ctx, bqClient, sql, statementType, nil, connProps)
+	resp, err := source.RunSQL(ctx, bqClient, sql, statementType, nil, connProps)
+	if err != nil {
+		return nil, util.NewClientServerError("error running sql", http.StatusInternalServerError, err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/bigquery/bigqueryforecast/bigqueryforecast.go

@@ -17,6 +17,7 @@ package bigqueryforecast
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"strings"
 
 	bigqueryapi "cloud.google.com/go/bigquery"
@@ -133,34 +134,34 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 	historyData, ok := paramsMap["history_data"].(string)
 	if !ok {
-		return nil, fmt.Errorf("unable to cast history_data parameter %v", paramsMap["history_data"])
+		return nil, util.NewAgentError(fmt.Sprintf("unable to cast history_data parameter %v", paramsMap["history_data"]), nil)
 	}
 	timestampCol, ok := paramsMap["timestamp_col"].(string)
 	if !ok {
-		return nil, fmt.Errorf("unable to cast timestamp_col parameter %v", paramsMap["timestamp_col"])
+		return nil, util.NewAgentError(fmt.Sprintf("unable to cast timestamp_col parameter %v", paramsMap["timestamp_col"]), nil)
 	}
 	dataCol, ok := paramsMap["data_col"].(string)
 	if !ok {
-		return nil, fmt.Errorf("unable to cast data_col parameter %v", paramsMap["data_col"])
+		return nil, util.NewAgentError(fmt.Sprintf("unable to cast data_col parameter %v", paramsMap["data_col"]), nil)
 	}
 	idColsRaw, ok := paramsMap["id_cols"].([]any)
 	if !ok {
-		return nil, fmt.Errorf("unable to cast id_cols parameter %v", paramsMap["id_cols"])
+		return nil, util.NewAgentError(fmt.Sprintf("unable to cast id_cols parameter %v", paramsMap["id_cols"]), nil)
 	}
 	var idCols []string
 	for _, v := range idColsRaw {
 		s, ok := v.(string)
 		if !ok {
-			return nil, fmt.Errorf("id_cols contains non-string value: %v", v)
+			return nil, util.NewAgentError(fmt.Sprintf("id_cols contains non-string value: %v", v), nil)
 		}
 		idCols = append(idCols, s)
 	}
@@ -169,13 +170,13 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 		if h, ok := paramsMap["horizon"].(float64); ok {
 			horizon = int(h)
 		} else {
-			return nil, fmt.Errorf("unable to cast horizon parameter %v", paramsMap["horizon"])
+			return nil, util.NewAgentError(fmt.Sprintf("unable to cast horizon parameter %v", paramsMap["horizon"]), nil)
 		}
 	}
 
 	bqClient, restService, err := source.RetrieveClientAndService(accessToken)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("failed to retrieve BigQuery client", http.StatusInternalServerError, err)
 	}
 
 	var historyDataSource string
@@ -185,7 +186,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			var connProps []*bigqueryapi.ConnectionProperty
 			session, err := source.BigQuerySession()(ctx)
 			if err != nil {
-				return nil, fmt.Errorf("failed to get BigQuery session: %w", err)
+				return nil, util.NewClientServerError("failed to get BigQuery session", http.StatusInternalServerError, err)
 			}
 			if session != nil {
 				connProps = []*bigqueryapi.ConnectionProperty{
@@ -194,22 +195,22 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			}
 			dryRunJob, err := bqutil.DryRunQuery(ctx, restService, source.BigQueryClient().Project(), source.BigQueryClient().Location, historyData, nil, connProps)
 			if err != nil {
-				return nil, fmt.Errorf("query validation failed: %w", err)
+				return nil, util.ProecessGcpError(err)
 			}
 			statementType := dryRunJob.Statistics.Query.StatementType
 			if statementType != "SELECT" {
-				return nil, fmt.Errorf("the 'history_data' parameter only supports a table ID or a SELECT query. The provided query has statement type '%s'", statementType)
+				return nil, util.NewAgentError(fmt.Sprintf("the 'history_data' parameter only supports a table ID or a SELECT query. The provided query has statement type '%s'", statementType), nil)
 			}
 
 			queryStats := dryRunJob.Statistics.Query
 			if queryStats != nil {
 				for _, tableRef := range queryStats.ReferencedTables {
 					if !source.IsDatasetAllowed(tableRef.ProjectId, tableRef.DatasetId) {
-						return nil, fmt.Errorf("query in history_data accesses dataset '%s.%s', which is not in the allowed list", tableRef.ProjectId, tableRef.DatasetId)
+						return nil, util.NewAgentError(fmt.Sprintf("query in history_data accesses dataset '%s.%s', which is not in the allowed list", tableRef.ProjectId, tableRef.DatasetId), nil)
 					}
 				}
 			} else {
-				return nil, fmt.Errorf("could not analyze query in history_data to validate against allowed datasets")
+				return nil, util.NewAgentError("could not analyze query in history_data to validate against allowed datasets", nil)
 			}
 		}
 		historyDataSource = fmt.Sprintf("(%s)", historyData)
@@ -226,11 +227,11 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 				projectID = source.BigQueryClient().Project()
 				datasetID = parts[0]
 			default:
-				return nil, fmt.Errorf("invalid table ID format for 'history_data': %q. Expected 'dataset.table' or 'project.dataset.table'", historyData)
+				return nil, util.NewAgentError(fmt.Sprintf("invalid table ID format for 'history_data': %q. Expected 'dataset.table' or 'project.dataset.table'", historyData), nil)
 			}
 
 			if !source.IsDatasetAllowed(projectID, datasetID) {
-				return nil, fmt.Errorf("access to dataset '%s.%s' (from table '%s') is not allowed", projectID, datasetID, historyData)
+				return nil, util.NewAgentError(fmt.Sprintf("access to dataset '%s.%s' (from table '%s') is not allowed", projectID, datasetID, historyData), nil)
 			}
 		}
 		historyDataSource = fmt.Sprintf("TABLE `%s`", historyData)
@@ -243,15 +244,15 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	}
 	sql := fmt.Sprintf(`SELECT * 
 		FROM AI.FORECAST(
-			%s,
-			data_col => '%s',
-			timestamp_col => '%s',
-			horizon => %d%s)`,
+            %s,
+            data_col => '%s',
+            timestamp_col => '%s',
+            horizon => %d%s)`,
 		historyDataSource, dataCol, timestampCol, horizon, idColsArg)
 
 	session, err := source.BigQuerySession()(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("failed to get BigQuery session: %w", err)
+		return nil, util.NewClientServerError("failed to get BigQuery session", http.StatusInternalServerError, err)
 	}
 	var connProps []*bigqueryapi.ConnectionProperty
 	if session != nil {
@@ -264,11 +265,15 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	// Log the query executed for debugging.
 	logger, err := util.LoggerFromContext(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("error getting logger: %s", err)
+		return nil, util.NewClientServerError("error getting logger", http.StatusInternalServerError, err)
 	}
 	logger.DebugContext(ctx, fmt.Sprintf("executing `%s` tool query: %s", resourceType, sql))
 
-	return source.RunSQL(ctx, bqClient, sql, "SELECT", nil, connProps)
+	resp, err := source.RunSQL(ctx, bqClient, sql, "SELECT", nil, connProps)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/bigquery/bigquerygetdatasetinfo/bigquerygetdatasetinfo.go

@@ -17,6 +17,7 @@ package bigquerygetdatasetinfo
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	bigqueryapi "cloud.google.com/go/bigquery"
 	yaml "github.com/goccy/go-yaml"
@@ -24,6 +25,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	bqutil "github.com/googleapis/genai-toolbox/internal/tools/bigquery/bigquerycommon"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	bigqueryrestapi "google.golang.org/api/bigquery/v2"
 )
@@ -120,38 +122,38 @@ type Tool struct {
 func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
-
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	mapParams := params.AsMap()
 	projectId, ok := mapParams[projectKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", projectKey)
+		// Updated: Use fmt.Sprintf for formatting, pass nil as cause
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", projectKey), nil)
 	}
 
 	datasetId, ok := mapParams[datasetKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", datasetKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", datasetKey), nil)
 	}
 
 	bqClient, _, err := source.RetrieveClientAndService(accessToken)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("failed to retrieve BigQuery client", http.StatusInternalServerError, err)
 	}
 
 	if !source.IsDatasetAllowed(projectId, datasetId) {
-		return nil, fmt.Errorf("access denied to dataset '%s' because it is not in the configured list of allowed datasets for project '%s'", datasetId, projectId)
+		return nil, util.NewClientServerError(fmt.Sprintf("access denied to dataset '%s' because it is not in the configured list of allowed datasets for project '%s'", datasetId, projectId), http.StatusInternalServerError, nil)
 	}
 
 	dsHandle := bqClient.DatasetInProject(projectId, datasetId)
 
 	metadata, err := dsHandle.Metadata(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("failed to get metadata for dataset %s (in project %s): %w", datasetId, projectId, err)
+		return nil, util.ProecessGcpError(err)
 	}
 
 	return metadata, nil

internal/tools/bigquery/bigquerygettableinfo/bigquerygettableinfo.go

@@ -17,6 +17,7 @@ package bigquerygettableinfo
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	bigqueryapi "cloud.google.com/go/bigquery"
 	yaml "github.com/goccy/go-yaml"
@@ -24,6 +25,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	bqutil "github.com/googleapis/genai-toolbox/internal/tools/bigquery/bigquerycommon"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	bigqueryrestapi "google.golang.org/api/bigquery/v2"
 )
@@ -125,35 +127,35 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	mapParams := params.AsMap()
 	projectId, ok := mapParams[projectKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", projectKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", projectKey), nil)
 	}
 
 	datasetId, ok := mapParams[datasetKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", datasetKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", datasetKey), nil)
 	}
 
 	tableId, ok := mapParams[tableKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", tableKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", tableKey), nil)
 	}
 
 	if !source.IsDatasetAllowed(projectId, datasetId) {
-		return nil, fmt.Errorf("access denied to dataset '%s' because it is not in the configured list of allowed datasets for project '%s'", datasetId, projectId)
+		return nil, util.NewClientServerError(fmt.Sprintf("access denied to dataset '%s' because it is not in the configured list of allowed datasets for project '%s'", datasetId, projectId), http.StatusInternalServerError, nil)
 	}
 
 	bqClient, _, err := source.RetrieveClientAndService(accessToken)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("failed to retrieve BigQuery client", http.StatusInternalServerError, err)
 	}
 
 	dsHandle := bqClient.DatasetInProject(projectId, datasetId)
@@ -161,7 +163,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 
 	metadata, err := tableHandle.Metadata(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("failed to get metadata for table %s.%s.%s: %w", projectId, datasetId, tableId, err)
+		return nil, util.ProecessGcpError(err)
 	}
 
 	return metadata, nil

internal/tools/bigquery/bigquerylistdatasetids/bigquerylistdatasetids.go

@@ -17,12 +17,14 @@ package bigquerylistdatasetids
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	bigqueryapi "cloud.google.com/go/bigquery"
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	bigqueryrestapi "google.golang.org/api/bigquery/v2"
 	"google.golang.org/api/iterator"
@@ -120,10 +122,10 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	if len(source.BigQueryAllowedDatasets()) > 0 {
@@ -132,12 +134,12 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	mapParams := params.AsMap()
 	projectId, ok := mapParams[projectKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", projectKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", projectKey), nil)
 	}
 
 	bqClient, _, err := source.RetrieveClientAndService(accessToken)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("failed to retrieve BigQuery client", http.StatusInternalServerError, err)
 	}
 	datasetIterator := bqClient.Datasets(ctx)
 	datasetIterator.ProjectID = projectId
@@ -149,7 +151,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			break
 		}
 		if err != nil {
-			return nil, fmt.Errorf("unable to iterate through datasets: %w", err)
+			return nil, util.ProecessGcpError(err)
 		}
 
 		// Remove leading and trailing quotes

internal/tools/bigquery/bigquerylisttableids/bigquerylisttableids.go

@@ -17,6 +17,7 @@ package bigquerylisttableids
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	bigqueryapi "cloud.google.com/go/bigquery"
 	yaml "github.com/goccy/go-yaml"
@@ -24,6 +25,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	bqutil "github.com/googleapis/genai-toolbox/internal/tools/bigquery/bigquerycommon"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	bigqueryrestapi "google.golang.org/api/bigquery/v2"
 	"google.golang.org/api/iterator"
@@ -123,31 +125,30 @@ type Tool struct {
 func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
-
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	mapParams := params.AsMap()
 	projectId, ok := mapParams[projectKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", projectKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", projectKey), nil)
 	}
 
 	datasetId, ok := mapParams[datasetKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", datasetKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", datasetKey), nil)
 	}
 
 	if !source.IsDatasetAllowed(projectId, datasetId) {
-		return nil, fmt.Errorf("access denied to dataset '%s' because it is not in the configured list of allowed datasets for project '%s'", datasetId, projectId)
+		return nil, util.NewClientServerError(fmt.Sprintf("access denied to dataset '%s' because it is not in the configured list of allowed datasets for project '%s'", datasetId, projectId), http.StatusInternalServerError, nil)
 	}
 
 	bqClient, _, err := source.RetrieveClientAndService(accessToken)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("failed to retrieve BigQuery client", http.StatusInternalServerError, err)
 	}
 
 	dsHandle := bqClient.DatasetInProject(projectId, datasetId)
@@ -160,7 +161,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			break
 		}
 		if err != nil {
-			return nil, fmt.Errorf("failed to iterate through tables in dataset %s.%s: %w", projectId, datasetId, err)
+			return nil, util.ProecessGcpError(err)
 		}
 
 		// Remove leading and trailing quotes

internal/tools/bigquery/bigquerysearchcatalog/bigquerysearchcatalog.go

@@ -17,6 +17,7 @@ package bigquerysearchcatalog
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"strings"
 
 	dataplexapi "cloud.google.com/go/dataplex/apiv1"
@@ -26,6 +27,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	bigqueryds "github.com/googleapis/genai-toolbox/internal/sources/bigquery"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/iterator"
 )
@@ -186,28 +188,31 @@ func ExtractType(resourceString string) string {
 	return typeMap[resourceString[lastIndex+1:]]
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 	pageSize := int32(paramsMap["pageSize"].(int))
 	prompt, _ := paramsMap["prompt"].(string)
+
 	projectIdSlice, err := parameters.ConvertAnySliceToTyped(paramsMap["projectIds"].([]any), "string")
 	if err != nil {
-		return nil, fmt.Errorf("can't convert projectIds to array of strings: %s", err)
+		return nil, util.NewAgentError(fmt.Sprintf("can't convert projectIds to array of strings: %s", err), err)
 	}
 	projectIds := projectIdSlice.([]string)
+
 	datasetIdSlice, err := parameters.ConvertAnySliceToTyped(paramsMap["datasetIds"].([]any), "string")
 	if err != nil {
-		return nil, fmt.Errorf("can't convert datasetIds to array of strings: %s", err)
+		return nil, util.NewAgentError(fmt.Sprintf("can't convert datasetIds to array of strings: %s", err), err)
 	}
 	datasetIds := datasetIdSlice.([]string)
+
 	typesSlice, err := parameters.ConvertAnySliceToTyped(paramsMap["types"].([]any), "string")
 	if err != nil {
-		return nil, fmt.Errorf("can't convert types to array of strings: %s", err)
+		return nil, util.NewAgentError(fmt.Sprintf("can't convert types to array of strings: %s", err), err)
 	}
 	types := typesSlice.([]string)
 
@@ -223,17 +228,17 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if source.UseClientAuthorization() {
 		tokenStr, err := accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 		catalogClient, err = dataplexClientCreator(tokenStr)
 		if err != nil {
-			return nil, fmt.Errorf("error creating client from OAuth access token: %w", err)
+			return nil, util.NewClientServerError("error creating client from OAuth access token", http.StatusInternalServerError, err)
 		}
 	}
 
 	it := catalogClient.SearchEntries(ctx, req)
 	if it == nil {
-		return nil, fmt.Errorf("failed to create search entries iterator for project %q", source.BigQueryProject())
+		return nil, util.NewClientServerError(fmt.Sprintf("failed to create search entries iterator for project %q", source.BigQueryProject()), http.StatusInternalServerError, nil)
 	}
 
 	var results []Response
@@ -243,7 +248,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			break
 		}
 		if err != nil {
-			break
+			return nil, util.ProecessGcpError(err)
 		}
 		entrySource := entry.DataplexEntry.GetEntrySource()
 		resp := Response{

internal/tools/bigquery/bigquerysql/bigquerysql.go

@@ -17,6 +17,7 @@ package bigquerysql
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"reflect"
 	"strings"
 
@@ -27,6 +28,7 @@ import (
 	bigqueryds "github.com/googleapis/genai-toolbox/internal/sources/bigquery"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	bqutil "github.com/googleapis/genai-toolbox/internal/tools/bigquery/bigquerycommon"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	bigqueryrestapi "google.golang.org/api/bigquery/v2"
 )
@@ -103,11 +105,10 @@ type Tool struct {
 func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
-
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	highLevelParams := make([]bigqueryapi.QueryParameter, 0, len(t.Parameters))
@@ -116,7 +117,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	paramsMap := params.AsMap()
 	newStatement, err := parameters.ResolveTemplateParams(t.TemplateParameters, t.Statement, paramsMap)
 	if err != nil {
-		return nil, fmt.Errorf("unable to extract template params %w", err)
+		return nil, util.NewAgentError("unable to extract template params", err)
 	}
 
 	for _, p := range t.Parameters {
@@ -127,13 +128,13 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 		if arrayParam, ok := p.(*parameters.ArrayParameter); ok {
 			arrayParamValue, ok := value.([]any)
 			if !ok {
-				return nil, fmt.Errorf("unable to convert parameter `%s` to []any", name)
+				return nil, util.NewAgentError(fmt.Sprintf("unable to convert parameter `%s` to []any", name), nil)
 			}
 			itemType := arrayParam.GetItems().GetType()
 			var err error
 			value, err = parameters.ConvertAnySliceToTyped(arrayParamValue, itemType)
 			if err != nil {
-				return nil, fmt.Errorf("unable to convert parameter `%s` from []any to typed slice: %w", name, err)
+				return nil, util.NewAgentError(fmt.Sprintf("unable to convert parameter `%s` from []any to typed slice", name), err)
 			}
 		}
 
@@ -161,7 +162,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			lowLevelParam.ParameterType.Type = "ARRAY"
 			itemType, err := bqutil.BQTypeStringFromToolType(arrayParam.GetItems().GetType())
 			if err != nil {
-				return nil, err
+				return nil, util.NewAgentError("unable to get BigQuery type from tool parameter type", err)
 			}
 			lowLevelParam.ParameterType.ArrayType = &bigqueryrestapi.QueryParameterType{Type: itemType}
 
@@ -178,7 +179,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			// Handle scalar types based on their defined type.
 			bqType, err := bqutil.BQTypeStringFromToolType(p.GetType())
 			if err != nil {
-				return nil, err
+				return nil, util.NewAgentError("unable to get BigQuery type from tool parameter type", err)
 			}
 			lowLevelParam.ParameterType.Type = bqType
 			lowLevelParam.ParameterValue.Value = fmt.Sprintf("%v", value)
@@ -190,7 +191,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if source.BigQuerySession() != nil {
 		session, err := source.BigQuerySession()(ctx)
 		if err != nil {
-			return nil, fmt.Errorf("failed to get BigQuery session: %w", err)
+			return nil, util.NewClientServerError("failed to get BigQuery session", http.StatusInternalServerError, err)
 		}
 		if session != nil {
 			// Add session ID to the connection properties for subsequent calls.
@@ -200,17 +201,20 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 
 	bqClient, restService, err := source.RetrieveClientAndService(accessToken)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("failed to retrieve BigQuery client", http.StatusInternalServerError, err)
 	}
 
 	dryRunJob, err := bqutil.DryRunQuery(ctx, restService, bqClient.Project(), bqClient.Location, newStatement, lowLevelParams, connProps)
 	if err != nil {
-		return nil, fmt.Errorf("query validation failed: %w", err)
+		return nil, util.ProecessGcpError(err)
 	}
 
 	statementType := dryRunJob.Statistics.Query.StatementType
-
-	return source.RunSQL(ctx, bqClient, newStatement, statementType, highLevelParams, connProps)
+	resp, err := source.RunSQL(ctx, bqClient, newStatement, statementType, highLevelParams, connProps)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/bigtable/bigtable.go

@@ -17,12 +17,14 @@ package bigtable
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"cloud.google.com/go/bigtable"
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -96,24 +98,28 @@ type Tool struct {
 func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
-
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 	newStatement, err := parameters.ResolveTemplateParams(t.TemplateParameters, t.Statement, paramsMap)
 	if err != nil {
-		return nil, fmt.Errorf("unable to extract template params %w", err)
+		return nil, util.NewAgentError("unable to extract template params", err)
 	}
 
 	newParams, err := parameters.GetParams(t.Parameters, paramsMap)
 	if err != nil {
-		return nil, fmt.Errorf("unable to extract standard params %w", err)
+		return nil, util.NewAgentError("unable to extract standard params", err)
 	}
-	return source.RunSQL(ctx, newStatement, t.Parameters, newParams)
+
+	resp, err := source.RunSQL(ctx, newStatement, t.Parameters, newParams)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudgda/cloudgda.go

@@ -18,11 +18,13 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -119,17 +121,16 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-// Invoke executes the tool logic
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 	query, ok := paramsMap["query"].(string)
 	if !ok {
-		return nil, fmt.Errorf("query parameter not found or not a string")
+		return nil, util.NewAgentError("query parameter not found or not a string", nil)
 	}
 
 	// Parse the access token if provided
@@ -138,7 +139,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 		var err error
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
 
@@ -154,9 +155,14 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 
 	bodyBytes, err := json.Marshal(payload)
 	if err != nil {
-		return nil, fmt.Errorf("failed to marshal request payload: %w", err)
+		return nil, util.NewClientServerError("failed to marshal request payload", http.StatusInternalServerError, err)
 	}
-	return source.RunQuery(ctx, tokenStr, bodyBytes)
+
+	resp, err := source.RunQuery(ctx, tokenStr, bodyBytes)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcarefhirfetchpage/cloudhealthcarefhirfetchpage.go

@@ -17,11 +17,13 @@ package fhirfetchpage
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -93,24 +95,31 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	url, ok := params.AsMap()[pageURLKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", pageURLKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", pageURLKey), nil)
 	}
+
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
-	return source.FHIRFetchPage(ctx, url, tokenStr)
+
+	resp, err := source.FHIRFetchPage(ctx, url, tokenStr)
+	if err != nil {
+
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcarefhirpatienteverything/cloudhealthcarefhirpatienteverything.go

@@ -17,6 +17,7 @@ package fhirpatienteverything
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"strings"
 
 	"github.com/goccy/go-yaml"
@@ -24,6 +25,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/googleapi"
 )
@@ -116,26 +118,27 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	storeID, err := common.ValidateAndFetchStoreID(params, source.AllowedFHIRStores())
 	if err != nil {
-		return nil, err
+		// ValidateAndFetchStoreID usually returns input validation errors
+		return nil, util.NewAgentError("failed to validate store ID", err)
 	}
 	patientID, ok := params.AsMap()[patientIDKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", patientIDKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", patientIDKey), nil)
 	}
 
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
 
@@ -143,11 +146,11 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if val, ok := params.AsMap()[typeFilterKey]; ok {
 		types, ok := val.([]any)
 		if !ok {
-			return nil, fmt.Errorf("invalid '%s' parameter; expected a string array", typeFilterKey)
+			return nil, util.NewAgentError(fmt.Sprintf("invalid '%s' parameter; expected a string array", typeFilterKey), nil)
 		}
 		typeFilterSlice, err := parameters.ConvertAnySliceToTyped(types, "string")
 		if err != nil {
-			return nil, fmt.Errorf("can't convert '%s' to array of strings: %s", typeFilterKey, err)
+			return nil, util.NewAgentError(fmt.Sprintf("can't convert '%s' to array of strings: %s", typeFilterKey, err), err)
 		}
 		if len(typeFilterSlice.([]string)) != 0 {
 			opts = append(opts, googleapi.QueryParameter("_type", strings.Join(typeFilterSlice.([]string), ",")))
@@ -156,13 +159,18 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if since, ok := params.AsMap()[sinceFilterKey]; ok {
 		sinceStr, ok := since.(string)
 		if !ok {
-			return nil, fmt.Errorf("invalid '%s' parameter; expected a string", sinceFilterKey)
+			return nil, util.NewAgentError(fmt.Sprintf("invalid '%s' parameter; expected a string", sinceFilterKey), nil)
 		}
 		if sinceStr != "" {
 			opts = append(opts, googleapi.QueryParameter("_since", sinceStr))
 		}
 	}
-	return source.FHIRPatientEverything(storeID, patientID, tokenStr, opts)
+
+	resp, err := source.FHIRPatientEverything(storeID, patientID, tokenStr, opts)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcarefhirpatientsearch/cloudhealthcarefhirpatientsearch.go

@@ -17,6 +17,7 @@ package fhirpatientsearch
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"strings"
 
 	"github.com/goccy/go-yaml"
@@ -24,6 +25,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/googleapi"
 )
@@ -150,22 +152,22 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	storeID, err := common.ValidateAndFetchStoreID(params, source.AllowedFHIRStores())
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to validate store ID", err)
 	}
 
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
 
@@ -179,14 +181,14 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			var ok bool
 			summary, ok = v.(bool)
 			if !ok {
-				return nil, fmt.Errorf("invalid '%s' parameter; expected a boolean", summaryKey)
+				return nil, util.NewAgentError(fmt.Sprintf("invalid '%s' parameter; expected a boolean", summaryKey), nil)
 			}
 			continue
 		}
 
 		val, ok := v.(string)
 		if !ok {
-			return nil, fmt.Errorf("invalid parameter '%s'; expected a string", k)
+			return nil, util.NewAgentError(fmt.Sprintf("invalid parameter '%s'; expected a string", k), nil)
 		}
 		if val == "" {
 			continue
@@ -205,7 +207,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			}
 			parts := strings.Split(val, "/")
 			if len(parts) != 2 {
-				return nil, fmt.Errorf("invalid '%s' format; expected YYYY-MM-DD/YYYY-MM-DD", k)
+				return nil, util.NewAgentError(fmt.Sprintf("invalid '%s' format; expected YYYY-MM-DD/YYYY-MM-DD", k), nil)
 			}
 			var values []string
 			if parts[0] != "" {
@@ -229,13 +231,17 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 		case familyNameKey:
 			opts = append(opts, googleapi.QueryParameter("family", val))
 		default:
-			return nil, fmt.Errorf("unexpected parameter key %q", k)
+			return nil, util.NewAgentError(fmt.Sprintf("unexpected parameter key %q", k), nil)
 		}
 	}
 	if summary {
 		opts = append(opts, googleapi.QueryParameter("_summary", "text"))
 	}
-	return source.FHIRPatientSearch(storeID, tokenStr, opts)
+	resp, err := source.FHIRPatientSearch(storeID, tokenStr, opts)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcaregetdataset/cloudhealthcaregetdataset.go

@@ -17,11 +17,13 @@ package gethealthcaredataset
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/healthcare/v1"
 )
@@ -90,19 +92,23 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
-	return source.GetDataset(tokenStr)
+	resp, err := source.GetDataset(tokenStr)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcaregetdicomstore/cloudhealthcaregetdicomstore.go

@@ -17,12 +17,14 @@ package getdicomstore
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/healthcare/v1"
 )
@@ -107,23 +109,27 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	storeID, err := common.ValidateAndFetchStoreID(params, source.AllowedDICOMStores())
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to validate store ID", err)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
-	return source.GetDICOMStore(storeID, tokenStr)
+	resp, err := source.GetDICOMStore(storeID, tokenStr)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcaregetdicomstoremetrics/cloudhealthcaregetdicomstoremetrics.go

@@ -17,12 +17,14 @@ package getdicomstoremetrics
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/healthcare/v1"
 )
@@ -107,23 +109,27 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	storeID, err := common.ValidateAndFetchStoreID(params, source.AllowedDICOMStores())
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to validate store ID", err)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
-	return source.GetDICOMStoreMetrics(storeID, tokenStr)
+	resp, err := source.GetDICOMStoreMetrics(storeID, tokenStr)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcaregetfhirresource/cloudhealthcaregetfhirresource.go

@@ -17,12 +17,14 @@ package getfhirresource
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -112,32 +114,36 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	storeID, err := common.ValidateAndFetchStoreID(params, source.AllowedFHIRStores())
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to validate store ID", err)
 	}
 	resType, ok := params.AsMap()[typeKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", typeKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", typeKey), nil)
 	}
 	resID, ok := params.AsMap()[idKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected a string", idKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected a string", idKey), nil)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
-	return source.GetFHIRResource(storeID, resType, resID, tokenStr)
+	resp, err := source.GetFHIRResource(storeID, resType, resID, tokenStr)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcaregetfhirstore/cloudhealthcaregetfhirstore.go

@@ -17,12 +17,14 @@ package getfhirstore
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/healthcare/v1"
 )
@@ -107,23 +109,27 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	storeID, err := common.ValidateAndFetchStoreID(params, source.AllowedFHIRStores())
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to validate store ID", err)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
-	return source.GetFHIRStore(storeID, tokenStr)
+	resp, err := source.GetFHIRStore(storeID, tokenStr)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcaregetfhirstoremetrics/cloudhealthcaregetfhirstoremetrics.go

@@ -17,12 +17,14 @@ package getfhirstoremetrics
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/healthcare/v1"
 )
@@ -107,23 +109,27 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	storeID, err := common.ValidateAndFetchStoreID(params, source.AllowedFHIRStores())
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to validate store ID", err)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
-	return source.GetFHIRStoreMetrics(storeID, tokenStr)
+	resp, err := source.GetFHIRStoreMetrics(storeID, tokenStr)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcarelistdicomstores/cloudhealthcarelistdicomstores.go

@@ -17,11 +17,13 @@ package listdicomstores
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/healthcare/v1"
 )
@@ -90,19 +92,23 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
-	return source.ListDICOMStores(tokenStr)
+	resp, err := source.ListDICOMStores(tokenStr)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcarelistfhirstores/cloudhealthcarelistfhirstores.go

@@ -17,11 +17,13 @@ package listfhirstores
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/healthcare/v1"
 )
@@ -90,19 +92,23 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
-	return source.ListFHIRStores(tokenStr)
+	resp, err := source.ListFHIRStores(tokenStr)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcareretrieverendereddicominstance/cloudhealthcareretrieverendereddicominstance.go

@@ -17,12 +17,14 @@ package retrieverendereddicominstance
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -117,40 +119,44 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	storeID, err := common.ValidateAndFetchStoreID(params, source.AllowedDICOMStores())
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to validate store ID", err)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
 	study, ok := params.AsMap()[studyInstanceUIDKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid '%s' parameter; expected a string", studyInstanceUIDKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid '%s' parameter; expected a string", studyInstanceUIDKey), nil)
 	}
 	series, ok := params.AsMap()[seriesInstanceUIDKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid '%s' parameter; expected a string", seriesInstanceUIDKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid '%s' parameter; expected a string", seriesInstanceUIDKey), nil)
 	}
 	sop, ok := params.AsMap()[sopInstanceUIDKey].(string)
 	if !ok {
-		return nil, fmt.Errorf("invalid '%s' parameter; expected a string", sopInstanceUIDKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid '%s' parameter; expected a string", sopInstanceUIDKey), nil)
 	}
 	frame, ok := params.AsMap()[frameNumberKey].(int)
 	if !ok {
-		return nil, fmt.Errorf("invalid '%s' parameter; expected an integer", frameNumberKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid '%s' parameter; expected an integer", frameNumberKey), nil)
 	}
-	return source.RetrieveRenderedDICOMInstance(storeID, study, series, sop, frame, tokenStr)
+	resp, err := source.RetrieveRenderedDICOMInstance(storeID, study, series, sop, frame, tokenStr)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcaresearchdicominstances/cloudhealthcaresearchdicominstances.go

@@ -17,6 +17,7 @@ package searchdicominstances
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"strings"
 
 	"github.com/goccy/go-yaml"
@@ -24,6 +25,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/googleapi"
 )
@@ -131,33 +133,33 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	storeID, err := common.ValidateAndFetchStoreID(params, source.AllowedDICOMStores())
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to validate store ID", err)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
 
 	opts, err := common.ParseDICOMSearchParameters(params, []string{sopInstanceUIDKey, patientNameKey, patientIDKey, accessionNumberKey, referringPhysicianNameKey, studyDateKey, modalityKey})
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to parse DICOM search parameters", err)
 	}
 	paramsMap := params.AsMap()
 	dicomWebPath := "instances"
 	if studyInstanceUID, ok := paramsMap[studyInstanceUIDKey]; ok {
 		id, ok := studyInstanceUID.(string)
 		if !ok {
-			return nil, fmt.Errorf("invalid '%s' parameter; expected a string", studyInstanceUIDKey)
+			return nil, util.NewAgentError(fmt.Sprintf("invalid '%s' parameter; expected a string", studyInstanceUIDKey), nil)
 		}
 		if id != "" {
 			dicomWebPath = fmt.Sprintf("studies/%s/instances", id)
@@ -166,7 +168,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if seriesInstanceUID, ok := paramsMap[seriesInstanceUIDKey]; ok {
 		id, ok := seriesInstanceUID.(string)
 		if !ok {
-			return nil, fmt.Errorf("invalid '%s' parameter; expected a string", seriesInstanceUIDKey)
+			return nil, util.NewAgentError(fmt.Sprintf("invalid '%s' parameter; expected a string", seriesInstanceUIDKey), nil)
 		}
 		if id != "" {
 			if dicomWebPath != "instances" {
@@ -176,7 +178,11 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 			}
 		}
 	}
-	return source.SearchDICOM(t.Type, storeID, dicomWebPath, tokenStr, opts)
+	resp, err := source.SearchDICOM(t.Type, storeID, dicomWebPath, tokenStr, opts)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcaresearchdicomseries/cloudhealthcaresearchdicomseries.go

@@ -17,12 +17,14 @@ package searchdicomseries
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/googleapi"
 )
@@ -128,40 +130,44 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	storeID, err := common.ValidateAndFetchStoreID(params, source.AllowedDICOMStores())
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to validate store ID", err)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
 
 	opts, err := common.ParseDICOMSearchParameters(params, []string{seriesInstanceUIDKey, patientNameKey, patientIDKey, accessionNumberKey, referringPhysicianNameKey, studyDateKey, modalityKey})
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to parse DICOM search parameters", err)
 	}
 	paramsMap := params.AsMap()
 	dicomWebPath := "series"
 	if studyInstanceUID, ok := paramsMap[studyInstanceUIDKey]; ok {
 		id, ok := studyInstanceUID.(string)
 		if !ok {
-			return nil, fmt.Errorf("invalid '%s' parameter; expected a string", studyInstanceUIDKey)
+			return nil, util.NewAgentError(fmt.Sprintf("invalid '%s' parameter; expected a string", studyInstanceUIDKey), nil)
 		}
 		if id != "" {
 			dicomWebPath = fmt.Sprintf("studies/%s/series", id)
 		}
 	}
-	return source.SearchDICOM(t.Type, storeID, dicomWebPath, tokenStr, opts)
+	resp, err := source.SearchDICOM(t.Type, storeID, dicomWebPath, tokenStr, opts)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudhealthcare/cloudhealthcaresearchdicomstudies/cloudhealthcaresearchdicomstudies.go

@@ -17,12 +17,14 @@ package searchdicomstudies
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
 	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/googleapi"
 )
@@ -124,28 +126,32 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	storeID, err := common.ValidateAndFetchStoreID(params, source.AllowedDICOMStores())
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to validate store ID", err)
 	}
 	var tokenStr string
 	if source.UseClientAuthorization() {
 		tokenStr, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("error parsing access token: %w", err)
+			return nil, util.NewClientServerError("error parsing access token", http.StatusUnauthorized, err)
 		}
 	}
 	opts, err := common.ParseDICOMSearchParameters(params, []string{studyInstanceUIDKey, patientNameKey, patientIDKey, accessionNumberKey, referringPhysicianNameKey, studyDateKey})
 	if err != nil {
-		return nil, err
+		return nil, util.NewAgentError("failed to parse DICOM search parameters", err)
 	}
 	dicomWebPath := "studies"
-	return source.SearchDICOM(t.Type, storeID, dicomWebPath, tokenStr, opts)
+	resp, err := source.SearchDICOM(t.Type, storeID, dicomWebPath, tokenStr, opts)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudloggingadmin/cloudloggingadminlistlognames/cloudloggingadminlistlognames.go

@@ -16,11 +16,13 @@ package cloudloggingadminlistlognames
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -89,10 +91,10 @@ type Tool struct {
 	Parameters  parameters.Parameters `yaml:"parameters"`
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	limit := defaultLimit
@@ -100,18 +102,22 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if val, ok := paramsMap["limit"].(int); ok && val > 0 {
 		limit = val
 	} else if ok && val < 0 {
-		return nil, fmt.Errorf("limit must be greater than or equal to 1")
+		return nil, util.NewAgentError("limit must be greater than or equal to 1", nil)
 	}
 
 	tokenString := ""
 	if source.UseClientAuthorization() {
 		tokenString, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("failed to parse access token: %w", err)
+			return nil, util.NewClientServerError("failed to parse access token", http.StatusUnauthorized, err)
 		}
 	}
 
-	return source.ListLogNames(ctx, limit, tokenString)
+	resp, err := source.ListLogNames(ctx, limit, tokenString)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) ParseParams(data map[string]any, claimsMap map[string]map[string]any) (parameters.ParamValues, error) {

internal/tools/cloudloggingadmin/cloudloggingadminlistresourcetypes/cloudloggingadminlistresourcetypes.go

@@ -16,11 +16,13 @@ package cloudloggingadminlistresourcetypes
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -84,21 +86,25 @@ type Tool struct {
 	mcpManifest tools.McpManifest
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	tokenString := ""
 	if source.UseClientAuthorization() {
 		tokenString, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("failed to parse access token: %w", err)
+			return nil, util.NewClientServerError("failed to parse access token", http.StatusUnauthorized, err)
 		}
 	}
 
-	return source.ListResourceTypes(ctx, tokenString)
+	resp, err := source.ListResourceTypes(ctx, tokenString)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) ParseParams(data map[string]any, claimsMap map[string]map[string]any) (parameters.ParamValues, error) {

internal/tools/cloudloggingadmin/cloudloggingadminquerylogs/cloudloggingadminquerylogs.go

@@ -16,6 +16,7 @@ package cloudloggingadminquerylogs
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"time"
 
 	"github.com/goccy/go-yaml"
@@ -23,6 +24,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	cla "github.com/googleapis/genai-toolbox/internal/sources/cloudloggingadmin"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -104,10 +106,10 @@ type Tool struct {
 	mcpManifest tools.McpManifest
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	// Parse parameters
@@ -119,7 +121,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if val, ok := paramsMap["limit"].(int); ok && val > 0 {
 		limit = val
 	} else if ok && val < 0 {
-		return nil, fmt.Errorf("limit must be greater than or equal to 1")
+		return nil, util.NewAgentError("limit must be greater than or equal to 1", nil)
 	}
 
 	// Check for verbosity of output
@@ -129,7 +131,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	var filter string
 	if f, ok := paramsMap["filter"].(string); ok {
 		if len(f) == 0 {
-			return nil, fmt.Errorf("filter cannot be empty if provided")
+			return nil, util.NewAgentError("filter cannot be empty if provided", nil)
 		}
 		filter = f
 	}
@@ -138,7 +140,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	var startTime string
 	if val, ok := paramsMap["startTime"].(string); ok && val != "" {
 		if _, err := time.Parse(time.RFC3339, val); err != nil {
-			return nil, fmt.Errorf("startTime must be in RFC3339 format (e.g., 2025-12-09T00:00:00Z): %w", err)
+			return nil, util.NewAgentError(fmt.Sprintf("startTime must be in RFC3339 format (e.g., 2025-12-09T00:00:00Z): %v", err), err)
 		}
 		startTime = val
 	} else {
@@ -149,7 +151,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	var endTime string
 	if val, ok := paramsMap["endTime"].(string); ok && val != "" {
 		if _, err := time.Parse(time.RFC3339, val); err != nil {
-			return nil, fmt.Errorf("endTime must be in RFC3339 format (e.g., 2025-12-09T23:59:59Z): %w", err)
+			return nil, util.NewAgentError(fmt.Sprintf("endTime must be in RFC3339 format (e.g., 2025-12-09T23:59:59Z): %v", err), err)
 		}
 		endTime = val
 	}
@@ -158,7 +160,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if source.UseClientAuthorization() {
 		tokenString, err = accessToken.ParseBearerToken()
 		if err != nil {
-			return nil, fmt.Errorf("failed to parse access token: %w", err)
+			return nil, util.NewClientServerError("failed to parse access token", http.StatusUnauthorized, err)
 		}
 	}
 
@@ -171,7 +173,11 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 		Limit:       limit,
 	}
 
-	return source.QueryLogs(ctx, queryParams, tokenString)
+	resp, err := source.QueryLogs(ctx, queryParams, tokenString)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) ParseParams(data map[string]any, claimsMap map[string]map[string]any) (parameters.ParamValues, error) {

internal/tools/cloudmonitoring/cloudmonitoring.go

@@ -23,6 +23,7 @@ import (
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -93,22 +94,26 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 	projectID, ok := paramsMap["projectId"].(string)
 	if !ok {
-		return nil, fmt.Errorf("projectId parameter not found or not a string")
+		return nil, util.NewAgentError("projectId parameter not found or not a string", nil)
 	}
 	query, ok := paramsMap["query"].(string)
 	if !ok {
-		return nil, fmt.Errorf("query parameter not found or not a string")
+		return nil, util.NewAgentError("query parameter not found or not a string", nil)
 	}
-	return source.RunQuery(projectID, query)
+	resp, err := source.RunQuery(projectID, query)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsql/cloudsqlcloneinstance/cloudsqlcloneinstance.go

@@ -17,11 +17,13 @@ package cloudsqlcloneinstance
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	sqladmin "google.golang.org/api/sqladmin/v1"
 )
@@ -124,31 +126,35 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'project' parameter: %v", paramsMap["project"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'project' parameter: %v", paramsMap["project"]), nil)
 	}
 	sourceInstanceName, ok := paramsMap["sourceInstanceName"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'sourceInstanceName' parameter: %v", paramsMap["sourceInstanceName"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'sourceInstanceName' parameter: %v", paramsMap["sourceInstanceName"]), nil)
 	}
 	destinationInstanceName, ok := paramsMap["destinationInstanceName"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'destinationInstanceName' parameter: %v", paramsMap["destinationInstanceName"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'destinationInstanceName' parameter: %v", paramsMap["destinationInstanceName"]), nil)
 	}
 
 	pointInTime, _ := paramsMap["pointInTime"].(string)
 	preferredZone, _ := paramsMap["preferredZone"].(string)
 	preferredSecondaryZone, _ := paramsMap["preferredSecondaryZone"].(string)
 
-	return source.CloneInstance(ctx, project, sourceInstanceName, destinationInstanceName, pointInTime, preferredZone, preferredSecondaryZone, string(accessToken))
+	resp, err := source.CloneInstance(ctx, project, sourceInstanceName, destinationInstanceName, pointInTime, preferredZone, preferredSecondaryZone, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsql/cloudsqlcreatebackup/cloudsqlcreatebackup.go

@@ -17,11 +17,13 @@ package cloudsqlcreatebackup
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/sqladmin/v1"
 )
@@ -120,26 +122,30 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'project' parameter: %v", paramsMap["project"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'project' parameter: %v", paramsMap["project"]), nil)
 	}
 	instance, ok := paramsMap["instance"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'instance' parameter: %v", paramsMap["instance"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'instance' parameter: %v", paramsMap["instance"]), nil)
 	}
 
 	location, _ := paramsMap["location"].(string)
 	description, _ := paramsMap["backup_description"].(string)
 
-	return source.InsertBackupRun(ctx, project, instance, location, description, string(accessToken))
+	resp, err := source.InsertBackupRun(ctx, project, instance, location, description, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsql/cloudsqlcreatedatabase/cloudsqlcreatedatabase.go

@@ -17,11 +17,13 @@ package cloudsqlcreatedatabase
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -117,27 +119,31 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'project' parameter")
+		return nil, util.NewAgentError("missing 'project' parameter", nil)
 	}
 	instance, ok := paramsMap["instance"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'instance' parameter")
+		return nil, util.NewAgentError("missing 'instance' parameter", nil)
 	}
 	name, ok := paramsMap["name"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'name' parameter")
+		return nil, util.NewAgentError("missing 'name' parameter", nil)
 	}
-	return source.CreateDatabase(ctx, name, project, instance, string(accessToken))
+	resp, err := source.CreateDatabase(ctx, name, project, instance, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsql/cloudsqlcreateusers/cloudsqlcreateusers.go

@@ -17,11 +17,13 @@ package cloudsqlcreateusers
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -119,30 +121,34 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'project' parameter")
+		return nil, util.NewAgentError("missing 'project' parameter", nil)
 	}
 	instance, ok := paramsMap["instance"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'instance' parameter")
+		return nil, util.NewAgentError("missing 'instance' parameter", nil)
 	}
 	name, ok := paramsMap["name"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'name' parameter")
+		return nil, util.NewAgentError("missing 'name' parameter", nil)
 	}
 
 	iamUser, _ := paramsMap["iamUser"].(bool)
 	password, _ := paramsMap["password"].(string)
-	return source.CreateUsers(ctx, project, instance, name, password, iamUser, string(accessToken))
+	resp, err := source.CreateUsers(ctx, project, instance, name, password, iamUser, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsql/cloudsqlgetinstances/cloudsqlgetinstances.go

@@ -17,11 +17,13 @@ package cloudsqlgetinstances
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -117,23 +119,27 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	projectId, ok := paramsMap["projectId"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'projectId' parameter")
+		return nil, util.NewAgentError("missing 'projectId' parameter", nil)
 	}
 	instanceId, ok := paramsMap["instanceId"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'instanceId' parameter")
+		return nil, util.NewAgentError("missing 'instanceId' parameter", nil)
 	}
-	return source.GetInstance(ctx, projectId, instanceId, string(accessToken))
+	resp, err := source.GetInstance(ctx, projectId, instanceId, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsql/cloudsqllistdatabases/cloudsqllistdatabases.go

@@ -17,11 +17,13 @@ package cloudsqllistdatabases
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -116,23 +118,27 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'project' parameter")
+		return nil, util.NewAgentError("missing 'project' parameter", nil)
 	}
 	instance, ok := paramsMap["instance"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'instance' parameter")
+		return nil, util.NewAgentError("missing 'instance' parameter", nil)
 	}
-	return source.ListDatabase(ctx, project, instance, string(accessToken))
+	resp, err := source.ListDatabase(ctx, project, instance, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsql/cloudsqllistinstances/cloudsqllistinstances.go

@@ -17,11 +17,13 @@ package cloudsqllistinstances
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -115,19 +117,23 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'project' parameter")
+		return nil, util.NewAgentError("missing 'project' parameter", nil)
 	}
-	return source.ListInstance(ctx, project, string(accessToken))
+	resp, err := source.ListInstance(ctx, project, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsql/cloudsqlrestorebackup/cloudsqlrestorebackup.go

@@ -17,11 +17,13 @@ package cloudsqlrestorebackup
 import (
 	"context"
 	"fmt"
+	"net/http"
 
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/sqladmin/v1"
 )
@@ -120,29 +122,33 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	paramsMap := params.AsMap()
 
 	targetProject, ok := paramsMap["target_project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'target_project' parameter: %v", paramsMap["target_project"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'target_project' parameter: %v", paramsMap["target_project"]), nil)
 	}
 	targetInstance, ok := paramsMap["target_instance"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'target_instance' parameter: %v", paramsMap["target_instance"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'target_instance' parameter: %v", paramsMap["target_instance"]), nil)
 	}
 	backupID, ok := paramsMap["backup_id"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'backup_id' parameter: %v", paramsMap["backup_id"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'backup_id' parameter: %v", paramsMap["backup_id"]), nil)
 	}
 	sourceProject, _ := paramsMap["source_project"].(string)
 	sourceInstance, _ := paramsMap["source_instance"].(string)
 
-	return source.RestoreBackup(ctx, targetProject, targetInstance, sourceProject, sourceInstance, backupID, string(accessToken))
+	resp, err := source.RestoreBackup(ctx, targetProject, targetInstance, sourceProject, sourceInstance, backupID, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsql/cloudsqlwaitforoperation/cloudsqlwaitforoperation.go

@@ -17,12 +17,14 @@ package cloudsqlwaitforoperation
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"time"
 
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util"
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/sqladmin/v1"
 )
@@ -210,21 +212,21 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'project' parameter")
+		return nil, util.NewAgentError("missing 'project' parameter", nil)
 	}
 	operationID, ok := paramsMap["operation"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'operation' parameter")
+		return nil, util.NewAgentError("missing 'operation' parameter", nil)
 	}
 
 	ctx, cancel := context.WithTimeout(ctx, 30*time.Minute)
@@ -232,7 +234,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 
 	service, err := source.GetService(ctx, string(accessToken))
 	if err != nil {
-		return nil, err
+		return nil, util.ProecessGcpError(err)
 	}
 
 	delay := t.Delay
@@ -244,13 +246,13 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	for retries < maxRetries {
 		select {
 		case <-ctx.Done():
-			return nil, fmt.Errorf("timed out waiting for operation: %w", ctx.Err())
+			return nil, util.NewClientServerError("timed out waiting for operation", http.StatusRequestTimeout, ctx.Err())
 		default:
 		}
 
 		op, err := source.GetWaitForOperations(ctx, service, project, operationID, cloudSQLConnectionMessageTemplate, delay)
 		if err != nil {
-			return nil, err
+			return nil, util.ProecessGcpError(err)
 		} else if op != nil {
 			return op, nil
 		}
@@ -262,7 +264,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 		}
 		retries++
 	}
-	return nil, fmt.Errorf("exceeded max retries waiting for operation")
+	return nil, util.NewClientServerError("exceeded max retries waiting for operation", http.StatusGatewayTimeout, fmt.Errorf("exceeded max retries"))
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsqlmssql/cloudsqlmssqlcreateinstance/cloudsqlmssqlcreateinstance.go

@@ -17,12 +17,14 @@ package cloudsqlmssqlcreateinstance
 import (
 	"context"
 	"fmt"
+	"net/http" // Added for http.StatusInternalServerError
 	"strings"
 
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util" // Added for util.ToolboxError
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/sqladmin/v1"
 )
@@ -121,33 +123,33 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'project' parameter: %s", paramsMap["project"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'project' parameter: %s", paramsMap["project"]), nil)
 	}
 	name, ok := paramsMap["name"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'name' parameter: %s", paramsMap["name"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'name' parameter: %s", paramsMap["name"]), nil)
 	}
 	dbVersion, ok := paramsMap["databaseVersion"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'databaseVersion' parameter: %s", paramsMap["databaseVersion"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'databaseVersion' parameter: %s", paramsMap["databaseVersion"]), nil)
 	}
 	rootPassword, ok := paramsMap["rootPassword"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'rootPassword' parameter: %s", paramsMap["rootPassword"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'rootPassword' parameter: %s", paramsMap["rootPassword"]), nil)
 	}
 	editionPreset, ok := paramsMap["editionPreset"].(string)
 	if !ok {
-		return nil, fmt.Errorf("error casting 'editionPreset' parameter: %s", paramsMap["editionPreset"])
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'editionPreset' parameter: %s", paramsMap["editionPreset"]), nil)
 	}
 	settings := sqladmin.Settings{}
 	switch strings.ToLower(editionPreset) {
@@ -164,9 +166,13 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 		settings.DataDiskSizeGb = 100
 		settings.DataDiskType = "PD_SSD"
 	default:
-		return nil, fmt.Errorf("invalid 'editionPreset': %q. Must be either 'Production' or 'Development'", editionPreset)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid 'editionPreset': %q. Must be either 'Production' or 'Development'", editionPreset), nil)
 	}
-	return source.CreateInstance(ctx, project, name, dbVersion, rootPassword, settings, string(accessToken))
+	resp, err := source.CreateInstance(ctx, project, name, dbVersion, rootPassword, settings, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsqlmysql/cloudsqlmysqlcreateinstance/cloudsqlmysqlcreateinstance.go

@@ -17,12 +17,14 @@ package cloudsqlmysqlcreateinstance
 import (
 	"context"
 	"fmt"
+	"net/http" // Added for http.StatusInternalServerError
 	"strings"
 
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util" // Added for util.ToolboxError
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	sqladmin "google.golang.org/api/sqladmin/v1"
 )
@@ -121,33 +123,33 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'project' parameter")
+		return nil, util.NewAgentError("missing 'project' parameter", nil)
 	}
 	name, ok := paramsMap["name"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'name' parameter")
+		return nil, util.NewAgentError("missing 'name' parameter", nil)
 	}
 	dbVersion, ok := paramsMap["databaseVersion"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'databaseVersion' parameter")
+		return nil, util.NewAgentError("missing 'databaseVersion' parameter", nil)
 	}
 	rootPassword, ok := paramsMap["rootPassword"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'rootPassword' parameter")
+		return nil, util.NewAgentError("missing 'rootPassword' parameter", nil)
 	}
 	editionPreset, ok := paramsMap["editionPreset"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'editionPreset' parameter")
+		return nil, util.NewAgentError("missing 'editionPreset' parameter", nil)
 	}
 
 	settings := sqladmin.Settings{}
@@ -165,10 +167,14 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 		settings.DataDiskSizeGb = 100
 		settings.DataDiskType = "PD_SSD"
 	default:
-		return nil, fmt.Errorf("invalid 'editionPreset': %q. Must be either 'Production' or 'Development'", editionPreset)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid 'editionPreset': %q. Must be either 'Production' or 'Development'", editionPreset), nil)
 	}
 
-	return source.CreateInstance(ctx, project, name, dbVersion, rootPassword, settings, string(accessToken))
+	resp, err := source.CreateInstance(ctx, project, name, dbVersion, rootPassword, settings, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsqlpg/cloudsqlpgcreateinstances/cloudsqlpgcreateinstances.go

@@ -17,12 +17,14 @@ package cloudsqlpgcreateinstances
 import (
 	"context"
 	"fmt"
+	"net/http" // Added for http.StatusInternalServerError
 	"strings"
 
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util" // Added for util.ToolboxError
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	sqladmin "google.golang.org/api/sqladmin/v1"
 )
@@ -121,33 +123,33 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'project' parameter")
+		return nil, util.NewAgentError("missing 'project' parameter", nil)
 	}
 	name, ok := paramsMap["name"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'name' parameter")
+		return nil, util.NewAgentError("missing 'name' parameter", nil)
 	}
 	dbVersion, ok := paramsMap["databaseVersion"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'databaseVersion' parameter")
+		return nil, util.NewAgentError("missing 'databaseVersion' parameter", nil)
 	}
 	rootPassword, ok := paramsMap["rootPassword"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'rootPassword' parameter")
+		return nil, util.NewAgentError("missing 'rootPassword' parameter", nil)
 	}
 	editionPreset, ok := paramsMap["editionPreset"].(string)
 	if !ok {
-		return nil, fmt.Errorf("missing 'editionPreset' parameter")
+		return nil, util.NewAgentError("missing 'editionPreset' parameter", nil)
 	}
 
 	settings := sqladmin.Settings{}
@@ -165,9 +167,13 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 		settings.DataDiskSizeGb = 100
 		settings.DataDiskType = "PD_SSD"
 	default:
-		return nil, fmt.Errorf("invalid 'editionPreset': %q. Must be either 'Production' or 'Development'", editionPreset)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid 'editionPreset': %q. Must be either 'Production' or 'Development'", editionPreset), nil)
 	}
-	return source.CreateInstance(ctx, project, name, dbVersion, rootPassword, settings, string(accessToken))
+	resp, err := source.CreateInstance(ctx, project, name, dbVersion, rootPassword, settings, string(accessToken))
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/cloudsqlpg/cloudsqlpgupgradeprecheck/cloudsqlpgupgradeprecheck.go

@@ -17,12 +17,14 @@ package cloudsqlpgupgradeprecheck
 import (
 	"context"
 	"fmt"
+	"net/http" // Added for http.StatusInternalServerError
 	"time"
 
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util" // Added for util.ToolboxError
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	sqladmin "google.golang.org/api/sqladmin/v1"
 )
@@ -132,31 +134,31 @@ func (t Tool) ToConfig() tools.ToolConfig {
 }
 
 // Invoke executes the tool's logic.
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
 
 	project, ok := paramsMap["project"].(string)
 	if !ok || project == "" {
-		return nil, fmt.Errorf("missing or empty 'project' parameter")
+		return nil, util.NewAgentError("missing or empty 'project' parameter", nil)
 	}
 	instanceName, ok := paramsMap["instance"].(string)
 	if !ok || instanceName == "" {
-		return nil, fmt.Errorf("missing or empty 'instance' parameter")
+		return nil, util.NewAgentError("missing or empty 'instance' parameter", nil)
 	}
 	targetVersion, ok := paramsMap["targetDatabaseVersion"].(string)
 	if !ok || targetVersion == "" {
 		// This should not happen due to the default value
-		return nil, fmt.Errorf("missing or empty 'targetDatabaseVersion' parameter")
+		return nil, util.NewAgentError("missing or empty 'targetDatabaseVersion' parameter", nil)
 	}
 
 	service, err := source.GetService(ctx, string(accessToken))
 	if err != nil {
-		return nil, fmt.Errorf("failed to get HTTP client from source: %w", err)
+		return nil, util.ProecessGcpError(err)
 	}
 
 	reqBody := &sqladmin.InstancesPreCheckMajorVersionUpgradeRequest{
@@ -168,7 +170,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	call := service.Instances.PreCheckMajorVersionUpgrade(project, instanceName, reqBody).Context(ctx)
 	op, err := call.Do()
 	if err != nil {
-		return nil, fmt.Errorf("failed to start pre-check operation: %w", err)
+		return nil, util.ProecessGcpError(err)
 	}
 
 	const pollTimeout = 20 * time.Second
@@ -177,7 +179,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	for time.Now().Before(cutoffTime) {
 		currentOp, err := service.Operations.Get(project, op.Name).Context(ctx).Do()
 		if err != nil {
-			return nil, fmt.Errorf("failed to get operation status: %w", err)
+			return nil, util.ProecessGcpError(err)
 		}
 
 		if currentOp.Status == "DONE" {
@@ -186,7 +188,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 				if currentOp.Error.Errors[0].Code != "" {
 					errMsg = fmt.Sprintf("%s (Code: %s)", errMsg, currentOp.Error.Errors[0].Code)
 				}
-				return nil, fmt.Errorf("%s", errMsg)
+				return nil, util.NewClientServerError(errMsg, http.StatusInternalServerError, fmt.Errorf("pre-check operation failed with error: %s", errMsg))
 			}
 
 			var preCheckItems []*sqladmin.PreCheckResponse
@@ -199,7 +201,7 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 
 		select {
 		case <-ctx.Done():
-			return nil, ctx.Err()
+			return nil, util.NewClientServerError("timed out waiting for operation", http.StatusRequestTimeout, ctx.Err())
 		case <-time.After(5 * time.Second):
 		}
 	}

internal/tools/dataplex/dataplexlookupentry/dataplexlookupentry.go

@@ -17,12 +17,14 @@ package dataplexlookupentry
 import (
 	"context"
 	"fmt"
+	"net/http" // Added for http.StatusInternalServerError
 
 	dataplexpb "cloud.google.com/go/dataplex/apiv1/dataplexpb"
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util" // Added for util.ToolboxError
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -110,10 +112,10 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	paramsMap := params.AsMap()
@@ -122,10 +124,14 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	view, _ := paramsMap["view"].(int)
 	aspectTypeSlice, err := parameters.ConvertAnySliceToTyped(paramsMap["aspectTypes"].([]any), "string")
 	if err != nil {
-		return nil, fmt.Errorf("can't convert aspectTypes to array of strings: %s", err)
+		return nil, util.NewAgentError(fmt.Sprintf("can't convert aspectTypes to array of strings: %s", err), err)
 	}
 	aspectTypes := aspectTypeSlice.([]string)
-	return source.LookupEntry(ctx, name, view, aspectTypes, entry)
+	resp, err := source.LookupEntry(ctx, name, view, aspectTypes, entry)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/dataplex/dataplexsearchaspecttypes/dataplexsearchaspecttypes.go

@@ -17,12 +17,14 @@ package dataplexsearchaspecttypes
 import (
 	"context"
 	"fmt"
+	"net/http" // Added for http.StatusInternalServerError
 
 	"cloud.google.com/go/dataplex/apiv1/dataplexpb"
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util" // Added for util.ToolboxError
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -93,16 +95,29 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	paramsMap := params.AsMap()
-	query, _ := paramsMap["query"].(string)
-	pageSize, _ := paramsMap["pageSize"].(int)
-	orderBy, _ := paramsMap["orderBy"].(string)
-	return source.SearchAspectTypes(ctx, query, pageSize, orderBy)
+	query, ok := paramsMap["query"].(string)
+	if !ok {
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'query' parameter: %v", paramsMap["query"]), nil)
+	}
+	pageSize, ok := paramsMap["pageSize"].(int)
+	if !ok {
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'pageSize' parameter: %v", paramsMap["pageSize"]), nil)
+	}
+	orderBy, ok := paramsMap["orderBy"].(string)
+	if !ok {
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'orderBy' parameter: %v", paramsMap["orderBy"]), nil)
+	}
+	resp, err := source.SearchAspectTypes(ctx, query, pageSize, orderBy)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/dataplex/dataplexsearchentries/dataplexsearchentries.go

@@ -17,12 +17,14 @@ package dataplexsearchentries
 import (
 	"context"
 	"fmt"
+	"net/http" // Added for http.StatusInternalServerError
 
 	"cloud.google.com/go/dataplex/apiv1/dataplexpb"
 	"github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util" // Added for util.ToolboxError
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -93,16 +95,29 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 	paramsMap := params.AsMap()
-	query, _ := paramsMap["query"].(string)
-	pageSize, _ := paramsMap["pageSize"].(int)
-	orderBy, _ := paramsMap["orderBy"].(string)
-	return source.SearchEntries(ctx, query, pageSize, orderBy)
+	query, ok := paramsMap["query"].(string)
+	if !ok {
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'query' parameter: %v", paramsMap["query"]), nil)
+	}
+	pageSize, ok := paramsMap["pageSize"].(int)
+	if !ok {
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'pageSize' parameter: %v", paramsMap["pageSize"]), nil)
+	}
+	orderBy, ok := paramsMap["orderBy"].(string)
+	if !ok {
+		return nil, util.NewAgentError(fmt.Sprintf("error casting 'orderBy' parameter: %v", paramsMap["orderBy"]), nil)
+	}
+	resp, err := source.SearchEntries(ctx, query, pageSize, orderBy)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/firestore/firestoreadddocuments/firestoreadddocuments.go

@@ -17,13 +17,15 @@ package firestoreadddocuments
 import (
 	"context"
 	"fmt"
+	"net/http" // Added for http.StatusInternalServerError
 
 	firestoreapi "cloud.google.com/go/firestore"
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
-	"github.com/googleapis/genai-toolbox/internal/tools/firestore/util"
+	fsUtil "github.com/googleapis/genai-toolbox/internal/tools/firestore/util"
+	"github.com/googleapis/genai-toolbox/internal/util" // Added for util.ToolboxError
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -128,32 +130,32 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	mapParams := params.AsMap()
 	// Get collection path
 	collectionPath, ok := mapParams[collectionPathKey].(string)
 	if !ok || collectionPath == "" {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter", collectionPathKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter", collectionPathKey), nil)
 	}
 	// Validate collection path
-	if err := util.ValidateCollectionPath(collectionPath); err != nil {
-		return nil, fmt.Errorf("invalid collection path: %w", err)
+	if err := fsUtil.ValidateCollectionPath(collectionPath); err != nil {
+		return nil, util.NewAgentError(fmt.Sprintf("invalid collection path: %v", err), err)
 	}
 	// Get document data
 	documentDataRaw, ok := mapParams[documentDataKey]
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter", documentDataKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter", documentDataKey), nil)
 	}
 	// Convert the document data from JSON format to Firestore format
 	// The client is passed to handle referenceValue types
-	documentData, err := util.JSONToFirestoreValue(documentDataRaw, source.FirestoreClient())
+	documentData, err := fsUtil.JSONToFirestoreValue(documentDataRaw, source.FirestoreClient())
 	if err != nil {
-		return nil, fmt.Errorf("failed to convert document data: %w", err)
+		return nil, util.NewAgentError(fmt.Sprintf("failed to convert document data: %v", err), err)
 	}
 
 	// Get return document data flag
@@ -161,7 +163,11 @@ func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, para
 	if val, ok := mapParams[returnDocumentDataKey].(bool); ok {
 		returnData = val
 	}
-	return source.AddDocuments(ctx, collectionPath, documentData, returnData)
+	resp, err := source.AddDocuments(ctx, collectionPath, documentData, returnData)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/firestore/firestoredeletedocuments/firestoredeletedocuments.go

@@ -17,13 +17,15 @@ package firestoredeletedocuments
 import (
 	"context"
 	"fmt"
+	"net/http" // Added for http.StatusInternalServerError
 
 	firestoreapi "cloud.google.com/go/firestore"
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
-	"github.com/googleapis/genai-toolbox/internal/tools/firestore/util"
+	fsUtil "github.com/googleapis/genai-toolbox/internal/tools/firestore/util"
+	"github.com/googleapis/genai-toolbox/internal/util" // Added for util.ToolboxError
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -94,39 +96,43 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	mapParams := params.AsMap()
 	documentPathsRaw, ok := mapParams[documentPathsKey].([]any)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected an array", documentPathsKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected an array", documentPathsKey), nil)
 	}
 	if len(documentPathsRaw) == 0 {
-		return nil, fmt.Errorf("'%s' parameter cannot be empty", documentPathsKey)
+		return nil, util.NewAgentError(fmt.Sprintf("'%s' parameter cannot be empty", documentPathsKey), nil)
 	}
 
 	// Use ConvertAnySliceToTyped to convert the slice
 	typedSlice, err := parameters.ConvertAnySliceToTyped(documentPathsRaw, "string")
 	if err != nil {
-		return nil, fmt.Errorf("failed to convert document paths: %w", err)
+		return nil, util.NewAgentError(fmt.Sprintf("failed to convert document paths: %v", err), err)
 	}
 
 	documentPaths, ok := typedSlice.([]string)
 	if !ok {
-		return nil, fmt.Errorf("unexpected type conversion error for document paths")
+		return nil, util.NewAgentError("unexpected type conversion error for document paths", nil)
 	}
 
 	// Validate each document path
 	for i, path := range documentPaths {
-		if err := util.ValidateDocumentPath(path); err != nil {
-			return nil, fmt.Errorf("invalid document path at index %d: %w", i, err)
+		if err := fsUtil.ValidateDocumentPath(path); err != nil {
+			return nil, util.NewAgentError(fmt.Sprintf("invalid document path at index %d: %v", i, err), err)
 		}
 	}
-	return source.DeleteDocuments(ctx, documentPaths)
+	resp, err := source.DeleteDocuments(ctx, documentPaths)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/firestore/firestoregetdocuments/firestoregetdocuments.go

@@ -17,13 +17,15 @@ package firestoregetdocuments
 import (
 	"context"
 	"fmt"
+	"net/http" // Added for http.StatusInternalServerError
 
 	firestoreapi "cloud.google.com/go/firestore"
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
-	"github.com/googleapis/genai-toolbox/internal/tools/firestore/util"
+	fsUtil "github.com/googleapis/genai-toolbox/internal/tools/firestore/util"
+	"github.com/googleapis/genai-toolbox/internal/util" // Added for util.ToolboxError
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 )
 
@@ -94,40 +96,44 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
 
 	mapParams := params.AsMap()
 	documentPathsRaw, ok := mapParams[documentPathsKey].([]any)
 	if !ok {
-		return nil, fmt.Errorf("invalid or missing '%s' parameter; expected an array", documentPathsKey)
+		return nil, util.NewAgentError(fmt.Sprintf("invalid or missing '%s' parameter; expected an array", documentPathsKey), nil)
 	}
 
 	if len(documentPathsRaw) == 0 {
-		return nil, fmt.Errorf("'%s' parameter cannot be empty", documentPathsKey)
+		return nil, util.NewAgentError(fmt.Sprintf("'%s' parameter cannot be empty", documentPathsKey), nil)
 	}
 
 	// Use ConvertAnySliceToTyped to convert the slice
 	typedSlice, err := parameters.ConvertAnySliceToTyped(documentPathsRaw, "string")
 	if err != nil {
-		return nil, fmt.Errorf("failed to convert document paths: %w", err)
+		return nil, util.NewAgentError(fmt.Sprintf("failed to convert document paths: %v", err), err)
 	}
 
 	documentPaths, ok := typedSlice.([]string)
 	if !ok {
-		return nil, fmt.Errorf("unexpected type conversion error for document paths")
+		return nil, util.NewAgentError("unexpected type conversion error for document paths", nil)
 	}
 
 	// Validate each document path
 	for i, path := range documentPaths {
-		if err := util.ValidateDocumentPath(path); err != nil {
-			return nil, fmt.Errorf("invalid document path at index %d: %w", i, err)
+		if err := fsUtil.ValidateDocumentPath(path); err != nil {
+			return nil, util.NewAgentError(fmt.Sprintf("invalid document path at index %d: %v", i, err), err)
 		}
 	}
-	return source.GetDocuments(ctx, documentPaths)
+	resp, err := source.GetDocuments(ctx, documentPaths)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/firestore/firestoregetrules/firestoregetrules.go

@@ -17,11 +17,13 @@ package firestoregetrules
 import (
 	"context"
 	"fmt"
+	"net/http" // Added for http.StatusInternalServerError
 
 	yaml "github.com/goccy/go-yaml"
 	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
 	"github.com/googleapis/genai-toolbox/internal/sources"
 	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util" // Added for util.ToolboxError
 	"github.com/googleapis/genai-toolbox/internal/util/parameters"
 	"google.golang.org/api/firebaserules/v1"
 )
@@ -92,12 +94,16 @@ func (t Tool) ToConfig() tools.ToolConfig {
 	return t.Config
 }
 
-func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
 	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Type)
 	if err != nil {
-		return nil, err
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
 	}
-	return source.GetRules(ctx)
+	resp, err := source.GetRules(ctx)
+	if err != nil {
+		return nil, util.ProecessGcpError(err)
+	}
+	return resp, nil
 }
 
 func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {

internal/tools/tools.go

@@ -17,6 +17,7 @@ package tools
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"slices"
 	"strings"
 
@@ -80,13 +81,13 @@ type AccessToken string
 func (token AccessToken) ParseBearerToken() (string, error) {
 	headerParts := strings.Split(string(token), " ")
 	if len(headerParts) != 2 || strings.ToLower(headerParts[0]) != "bearer" {
-		return "", fmt.Errorf("authorization header must be in the format 'Bearer <token>': %w", util.ErrUnauthorized)
+		return "", util.NewClientServerError("authorization header must be in the format 'Bearer <token>'", http.StatusUnauthorized, nil)
 	}
 	return headerParts[1], nil
 }
 
 type Tool interface {
-	Invoke(context.Context, SourceProvider, parameters.ParamValues, AccessToken) (any, error)
+	Invoke(context.Context, SourceProvider, parameters.ParamValues, AccessToken) (any, util.ToolboxError)
 	EmbedParams(context.Context, parameters.ParamValues, map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error)
 	Manifest() Manifest
 	McpManifest() McpManifest

internal/util/errors.go

@@ -0,0 +1,122 @@
+// Copyright 2026 Google LLC
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package util
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"strings"
+
+	"google.golang.org/api/googleapi"
+)
+
+type ErrorCategory string
+
+const (
+	CategoryAgent  ErrorCategory = "AGENT_ERROR"
+	CategoryServer ErrorCategory = "SERVER_ERROR"
+)
+
+// ToolboxError is the interface all custom errors must satisfy
+type ToolboxError interface {
+	error
+	Category() ErrorCategory
+}
+
+// Agent Errors return 200 to the sender
+type AgentError struct {
+	Msg   string
+	Cause error
+}
+
+func (e *AgentError) Error() string { return e.Msg }
+
+func (e *AgentError) Category() ErrorCategory { return CategoryAgent }
+
+func (e *AgentError) Unwrap() error { return e.Cause }
+
+func NewAgentError(msg string, cause error) *AgentError {
+	return &AgentError{Msg: msg, Cause: cause}
+}
+
+// ClientServerError returns 4XX/5XX error code
+type ClientServerError struct {
+	Msg   string
+	Code  int
+	Cause error
+}
+
+func (e *ClientServerError) Error() string { return fmt.Sprintf("%s: %v", e.Msg, e.Cause) }
+
+func (e *ClientServerError) Category() ErrorCategory { return CategoryServer }
+
+func (e *ClientServerError) Unwrap() error { return e.Cause }
+
+func NewClientServerError(msg string, code int, cause error) *ClientServerError {
+	return &ClientServerError{Msg: msg, Code: code, Cause: cause}
+}
+
+// ProecessGcpError catches auth related errors and return 401/403 error codes
+// Returns AgentError for all other errors
+func ProecessGcpError(err error) ToolboxError {
+	var gErr *googleapi.Error
+	if errors.As(err, &gErr) {
+		if gErr.Code == 401 {
+			return NewClientServerError(
+				"failed to access GCP resource",
+				http.StatusUnauthorized,
+				err,
+			)
+		}
+		if gErr.Code == 403 {
+			return NewClientServerError(
+				"failed to access GCP resource",
+				http.StatusForbidden,
+				err,
+			)
+		}
+	}
+	return NewAgentError("error processing GCP request", err)
+}
+
+// ProcessGeneralError handles generic errors by inspecting the error string
+// for common status code patterns.
+func ProcessGeneralError(err error) ToolboxError {
+	if err == nil {
+		return nil
+	}
+
+	errStr := err.Error()
+
+	// Check for Unauthorized
+	if strings.Contains(errStr, "Error 401") || strings.Contains(errStr, "status 401") {
+		return NewClientServerError(
+			"failed to access resource",
+			http.StatusUnauthorized,
+			err,
+		)
+	}
+
+	// Check for Forbidden
+	if strings.Contains(errStr, "Error 403") || strings.Contains(errStr, "status 403") {
+		return NewClientServerError(
+			"failed to access resource",
+			http.StatusForbidden,
+			err,
+		)
+	}
+
+	// Default to AgentError for logical failures (task execution failed)
+	return NewAgentError("error processing request", err)
+}

internal/util/parameters/parameters.go

@@ -19,6 +19,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"net/http"
 	"reflect"
 	"regexp"
 	"slices"
@@ -118,7 +119,7 @@ func parseFromAuthService(paramAuthServices []ParamAuthService, claimsMap map[st
 		}
 		return v, nil
 	}
-	return nil, fmt.Errorf("missing or invalid authentication header: %w", util.ErrUnauthorized)
+	return nil, util.NewClientServerError("missing or invalid authentication header", http.StatusUnauthorized, nil)
 }
 
 // CheckParamRequired checks if a parameter is required based on the required and default field.

internal/util/util.go

@@ -17,7 +17,6 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -188,5 +187,3 @@ func InstrumentationFromContext(ctx context.Context) (*telemetry.Instrumentation
 	}
 	return nil, fmt.Errorf("unable to retrieve instrumentation")
 }
-
-var ErrUnauthorized = errors.New("unauthorized")