feat(tools/looker): tools to retrieve the connections, schemas, databases, and column metadata from a looker system. (#1804)

## Description

Add new tools to get metadata from databases through Looker

* get_connections
* get_connection_schemas
* get_connection_databases
* get_connection_tables
* get_connection_table_columns

cmd/root.go

@@ -102,6 +102,11 @@ import (
 	_ "github.com/googleapis/genai-toolbox/internal/tools/looker/lookerconversationalanalytics"
 	_ "github.com/googleapis/genai-toolbox/internal/tools/looker/lookerdeleteprojectfile"
 	_ "github.com/googleapis/genai-toolbox/internal/tools/looker/lookerdevmode"
+	_ "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetconnectiondatabases"
+	_ "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetconnections"
+	_ "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetconnectionschemas"
+	_ "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetconnectiontables"
+	_ "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetconnectiontablecolumns"
 	_ "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetdashboards"
 	_ "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetdimensions"
 	_ "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetexplores"

cmd/root_test.go

@@ -1507,7 +1507,7 @@ func TestPrebuiltTools(t *testing.T) {
 			wantToolset: server.ToolsetConfigs{
 				"looker_tools": tools.ToolsetConfig{
 					Name:      "looker_tools",
-					ToolNames: []string{"get_models", "get_explores", "get_dimensions", "get_measures", "get_filters", "get_parameters", "query", "query_sql", "query_url", "get_looks", "run_look", "make_look", "get_dashboards", "make_dashboard", "add_dashboard_element", "health_pulse", "health_analyze", "health_vacuum", "dev_mode", "get_projects", "get_project_files", "get_project_file", "create_project_file", "update_project_file", "delete_project_file"},
+					ToolNames: []string{"get_models", "get_explores", "get_dimensions", "get_measures", "get_filters", "get_parameters", "query", "query_sql", "query_url", "get_looks", "run_look", "make_look", "get_dashboards", "make_dashboard", "add_dashboard_element", "health_pulse", "health_analyze", "health_vacuum", "dev_mode", "get_projects", "get_project_files", "get_project_file", "create_project_file", "update_project_file", "delete_project_file", "get_connections", "get_connection_schemas", "get_connection_databases", "get_connection_tables", "get_connection_table_columns"},
 				},
 			},
 		},

docs/en/resources/tools/looker/looker-get-connection-databases.md

@@ -0,0 +1,41 @@
+---
+title: "looker-get-connection-databases"
+type: docs
+weight: 1
+description: >
+  A "looker-get-connection-databases" tool returns all the databases in a connection.
+aliases:
+- /resources/tools/looker-get-connection-databases
+---
+
+## About
+
+A `looker-get-connection-databases` tool returns all the databases in a connection.
+
+It's compatible with the following sources:
+
+- [looker](../../sources/looker.md)
+
+`looker-get-connection-databases` accepts a `conn` parameter.
+
+## Example
+
+```yaml
+tools:
+    get_connection_databases:
+        kind: looker-get-connection-databases
+        source: looker-source
+        description: |
+          get_connection_databases Tool
+
+          This tool will list the databases available from a connection if the connection
+          supports multiple databases.
+```
+
+## Reference
+
+| **field**   | **type** | **required** | **description**                                    |
+|-------------|:--------:|:------------:|----------------------------------------------------|
+| kind        |  string  |     true     | Must be "looker-get-connection-databases".         |
+| source      |  string  |     true     | Name of the source Looker instance.                |
+| description |  string  |     true     | Description of the tool that is passed to the LLM. |

docs/en/resources/tools/looker/looker-get-connection-schemas.md

@@ -0,0 +1,41 @@
+---
+title: "looker-get-connection-schemas"
+type: docs
+weight: 1
+description: >
+  A "looker-get-connection-schemas" tool returns all the schemas in a connection.
+aliases:
+- /resources/tools/looker-get-connection-schemas
+---
+
+## About
+
+A `looker-get-connection-schemas` tool returns all the schemas in a connection.
+
+It's compatible with the following sources:
+
+- [looker](../../sources/looker.md)
+
+`looker-get-connection-schemas` accepts a `conn` parameter and an optional `db` parameter.
+
+## Example
+
+```yaml
+tools:
+    get_connection_schemas:
+        kind: looker-get-connection-schemas
+        source: looker-source
+        description: |
+          get_connection_schemas Tool
+
+          This tool will list the schemas available from a connection, filtered by
+          an optional database name.
+```
+
+## Reference
+
+| **field**   | **type** | **required** | **description**                                    |
+|-------------|:--------:|:------------:|----------------------------------------------------|
+| kind        |  string  |     true     | Must be "looker-get-connection-schemas".           |
+| source      |  string  |     true     | Name of the source Looker instance.                |
+| description |  string  |     true     | Description of the tool that is passed to the LLM. |

docs/en/resources/tools/looker/looker-get-connection-table-columns.md

@@ -0,0 +1,43 @@
+---
+title: "looker-get-connection-table-columns"
+type: docs
+weight: 1
+description: >
+  A "looker-get-connection-table-columns" tool returns all the columns for each table specified.
+aliases:
+- /resources/tools/looker-get-connection-table-columns
+---
+
+## About
+
+A `looker-get-connection-table-columns` tool returns all the columnes for each table specified.
+
+
+It's compatible with the following sources:
+
+- [looker](../../sources/looker.md)
+
+`looker-get-connection-table-columns` accepts a `conn` parameter, a `schema` parameter, a `tables` parameter with a comma separated list of tables, and an optional `db` parameter.
+
+## Example
+
+```yaml
+tools:
+    get_connection_table_columns:
+        kind: looker-get-connection-table-columns
+        source: looker-source
+        description: |
+          get_connection_table_columns Tool
+
+          This tool will list the columns available from a connection, for all the tables
+          given in a comma separated list of table names, filtered by the 
+          schema name and optional database name.
+```
+
+## Reference
+
+| **field**   | **type** | **required** | **description**                                    |
+|-------------|:--------:|:------------:|----------------------------------------------------|
+| kind        |  string  |     true     | Must be "looker-get-connection-table-columns".     |
+| source      |  string  |     true     | Name of the source Looker instance.                |
+| description |  string  |     true     | Description of the tool that is passed to the LLM. |

docs/en/resources/tools/looker/looker-get-connection-tables.md

@@ -0,0 +1,41 @@
+---
+title: "looker-get-connection-tables"
+type: docs
+weight: 1
+description: >
+  A "looker-get-connection-tables" tool returns all the tables in a connection.
+aliases:
+- /resources/tools/looker-get-connection-tables
+---
+
+## About
+
+A `looker-get-connection-tables` tool returns all the tables in a connection.
+
+It's compatible with the following sources:
+
+- [looker](../../sources/looker.md)
+
+`looker-get-connection-tables` accepts a `conn` parameter, a `schema` parameter, and an optional `db` parameter.
+
+## Example
+
+```yaml
+tools:
+    get_connection_tables:
+        kind: looker-get-connection-tables
+        source: looker-source
+        description: |
+          get_connection_tables Tool
+
+          This tool will list the tables available from a connection, filtered by the 
+          schema name and optional database name.
+```
+
+## Reference
+
+| **field**   | **type** | **required** | **description**                                    |
+|-------------|:--------:|:------------:|----------------------------------------------------|
+| kind        |  string  |     true     | Must be "looker-get-connection-tables".            |
+| source      |  string  |     true     | Name of the source Looker instance.                |
+| description |  string  |     true     | Description of the tool that is passed to the LLM. |

docs/en/resources/tools/looker/looker-get-connections.md

@@ -0,0 +1,42 @@
+---
+title: "looker-get-connections"
+type: docs
+weight: 1
+description: >
+  A "looker-get-connections" tool returns all the connections in the source.
+aliases:
+- /resources/tools/looker-get-connections
+---
+
+## About
+
+A `looker-get-connections` tool returns all the connections in the source.
+
+It's compatible with the following sources:
+
+- [looker](../../sources/looker.md)
+
+`looker-get-connections` accepts no parameters.
+
+## Example
+
+```yaml
+tools:
+    get_connections:
+        kind: looker-get-connections
+        source: looker-source
+        description: |
+          get_connections Tool
+
+          This tool will list all the connections available in the Looker system, as
+          well as the dialect name, the default schema, the database if applicable,
+          and whether the connection supports multiple databases.
+```
+
+## Reference
+
+| **field**   | **type** | **required** | **description**                                    |
+|-------------|:--------:|:------------:|----------------------------------------------------|
+| kind        |  string  |     true     | Must be "looker-get-connections".                  |
+| source      |  string  |     true     | Name of the source Looker instance.                |
+| description |  string  |     true     | Description of the tool that is passed to the LLM. |

internal/prebuiltconfigs/tools/looker.yaml

@@ -823,6 +823,54 @@ tools:
           This tool must be called after the dev_mode tool has changed the session to
           dev mode.
 
+    get_connections:
+        kind: looker-get-connections
+        source: looker-source
+        description: |
+          get_connections Tool
+
+          This tool will list all the connections available in the Looker system, as
+          well as the dialect name, the default schema, the database if applicable,
+          and whether the connection supports multiple databases.
+
+    get_connection_schemas:
+        kind: looker-get-connection-schemas
+        source: looker-source
+        description: |
+          get_connection_schemas Tool
+
+          This tool will list the schemas available from a connection, filtered by
+          an optional database name.
+
+    get_connection_databases:
+        kind: looker-get-connection-databases
+        source: looker-source
+        description: |
+          get_connection_databases Tool
+
+          This tool will list the databases available from a connection if the connection
+          supports multiple databases.
+
+    get_connection_tables:
+        kind: looker-get-connection-tables
+        source: looker-source
+        description: |
+          get_connection_tables Tool
+
+          This tool will list the tables available from a connection, filtered by the 
+          schema name and optional database name.
+
+    get_connection_table_columns:
+        kind: looker-get-connection-table-columns
+        source: looker-source
+        description: |
+          get_connection_table_columns Tool
+
+          This tool will list the columns available from a connection, for all the tables
+          given in a comma separated list of table names, filtered by the 
+          schema name and optional database name.
+
+
 toolsets:
     looker_tools:
         - get_models
@@ -850,3 +898,8 @@ toolsets:
         - create_project_file
         - update_project_file
         - delete_project_file
+        - get_connections
+        - get_connection_schemas
+        - get_connection_databases
+        - get_connection_tables
+        - get_connection_table_columns

internal/tools/looker/lookergetconnectiondatabases/lookergetconnectiondatabases.go

@@ -0,0 +1,150 @@
+// Copyright 2025 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 lookergetconnectiondatabases
+
+import (
+	"context"
+	"fmt"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/googleapis/genai-toolbox/internal/sources"
+	lookersrc "github.com/googleapis/genai-toolbox/internal/sources/looker"
+	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/tools/looker/lookercommon"
+
+	"github.com/looker-open-source/sdk-codegen/go/rtl"
+	v4 "github.com/looker-open-source/sdk-codegen/go/sdk/v4"
+)
+
+const kind string = "looker-get-connection-databases"
+
+func init() {
+	if !tools.Register(kind, newConfig) {
+		panic(fmt.Sprintf("tool kind %q already registered", kind))
+	}
+}
+
+func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {
+	actual := Config{Name: name}
+	if err := decoder.DecodeContext(ctx, &actual); err != nil {
+		return nil, err
+	}
+	return actual, nil
+}
+
+type Config struct {
+	Name         string   `yaml:"name" validate:"required"`
+	Kind         string   `yaml:"kind" validate:"required"`
+	Source       string   `yaml:"source" validate:"required"`
+	Description  string   `yaml:"description" validate:"required"`
+	AuthRequired []string `yaml:"authRequired"`
+}
+
+// validate interface
+var _ tools.ToolConfig = Config{}
+
+func (cfg Config) ToolConfigKind() string {
+	return kind
+}
+
+func (cfg Config) Initialize(srcs map[string]sources.Source) (tools.Tool, error) {
+	// verify source exists
+	rawS, ok := srcs[cfg.Source]
+	if !ok {
+		return nil, fmt.Errorf("no source named %q configured", cfg.Source)
+	}
+
+	// verify the source is compatible
+	s, ok := rawS.(*lookersrc.Source)
+	if !ok {
+		return nil, fmt.Errorf("invalid source for %q tool: source kind must be `looker`", kind)
+	}
+
+	connParameter := tools.NewStringParameter("conn", "The connection containing the databases.")
+	parameters := tools.Parameters{connParameter}
+
+	mcpManifest := tools.GetMcpManifest(cfg.Name, cfg.Description, cfg.AuthRequired, parameters)
+
+	// finish tool setup
+	return Tool{
+		Name:           cfg.Name,
+		Kind:           kind,
+		Parameters:     parameters,
+		AuthRequired:   cfg.AuthRequired,
+		UseClientOAuth: s.UseClientOAuth,
+		Client:         s.Client,
+		ApiSettings:    s.ApiSettings,
+		manifest: tools.Manifest{
+			Description:  cfg.Description,
+			Parameters:   parameters.Manifest(),
+			AuthRequired: cfg.AuthRequired,
+		},
+		mcpManifest:        mcpManifest,
+	}, nil
+}
+
+// validate interface
+var _ tools.Tool = Tool{}
+
+type Tool struct {
+	Name               string `yaml:"name"`
+	Kind               string `yaml:"kind"`
+	UseClientOAuth     bool
+	Client             *v4.LookerSDK
+	ApiSettings        *rtl.ApiSettings
+	AuthRequired       []string         `yaml:"authRequired"`
+	Parameters         tools.Parameters `yaml:"parameters"`
+	manifest           tools.Manifest
+	mcpManifest        tools.McpManifest
+}
+
+func (t Tool) Invoke(ctx context.Context, params tools.ParamValues, accessToken tools.AccessToken) (any, error) {
+	mapParams := params.AsMap()
+	conn, ok := mapParams["conn"].(string)
+	if !ok {
+		return nil, fmt.Errorf("'conn' must be a string, got %T", mapParams["conn"])
+	}
+
+	sdk, err := lookercommon.GetLookerSDK(t.UseClientOAuth, t.ApiSettings, t.Client, accessToken)
+	if err != nil {
+		return nil, fmt.Errorf("error getting sdk: %w", err)
+	}
+	resp, err := sdk.ConnectionDatabases(conn, t.ApiSettings)
+	if err != nil {
+		return nil, fmt.Errorf("error making get_connection_databases request: %s", err)
+	}
+	//logger.DebugContext(ctx, "Got response of %v\n", resp)
+
+	return resp, nil
+}
+
+func (t Tool) ParseParams(data map[string]any, claims map[string]map[string]any) (tools.ParamValues, error) {
+	return tools.ParseParams(t.Parameters, data, claims)
+}
+
+func (t Tool) Manifest() tools.Manifest {
+	return t.manifest
+}
+
+func (t Tool) McpManifest() tools.McpManifest {
+	return t.mcpManifest
+}
+
+func (t Tool) Authorized(verifiedAuthServices []string) bool {
+	return tools.IsAuthorized(t.AuthRequired, verifiedAuthServices)
+}
+
+func (t Tool) RequiresClientAuthorization() bool {
+	return t.UseClientOAuth
+}

internal/tools/looker/lookergetconnectiondatabases/lookergetconnectiondatabases_test.go

@@ -0,0 +1,116 @@
+// Copyright 2025 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 lookergetconnectiondatabases_test
+
+import (
+	"strings"
+	"testing"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/google/go-cmp/cmp"
+	"github.com/googleapis/genai-toolbox/internal/server"
+	"github.com/googleapis/genai-toolbox/internal/testutils"
+	lkr "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetconnectiondatabases"
+)
+
+func TestParseFromYamlLookerGetConnectionDatabases(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		want server.ToolConfigs
+	}{
+		{
+			desc: "basic example",
+			in: `
+			tools:
+				example_tool:
+					kind: looker-get-connection-databases
+					source: my-instance
+					description: some description
+				`,
+			want: server.ToolConfigs{
+				"example_tool": lkr.Config{
+					Name:         "example_tool",
+					Kind:         "looker-get-connection-databases",
+					Source:       "my-instance",
+					Description:  "some description",
+					AuthRequired: []string{},
+				},
+			},
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			got := struct {
+				Tools server.ToolConfigs `yaml:"tools"`
+			}{}
+			// Parse contents
+			err := yaml.UnmarshalContext(ctx, testutils.FormatYaml(tc.in), &got)
+			if err != nil {
+				t.Fatalf("unable to unmarshal: %s", err)
+			}
+			if diff := cmp.Diff(tc.want, got.Tools); diff != "" {
+				t.Fatalf("incorrect parse: diff %v", diff)
+			}
+		})
+	}
+
+}
+
+func TestFailParseFromYamlLookerGetConnectionDatabases(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		err  string
+	}{
+		{
+			desc: "Invalid method",
+			in: `
+			tools:
+				example_tool:
+					kind: looker-get-connection-databases
+					source: my-instance
+					method: GOT
+					description: some description
+			`,
+			err: "unable to parse tool \"example_tool\" as kind \"looker-get-connection-databases\": [4:1] unknown field \"method\"\n   1 | authRequired: []\n   2 | description: some description\n   3 | kind: looker-get-connection-databases\n>  4 | method: GOT\n       ^\n   5 | source: my-instance",
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			got := struct {
+				Tools server.ToolConfigs `yaml:"tools"`
+			}{}
+			// Parse contents
+			err := yaml.UnmarshalContext(ctx, testutils.FormatYaml(tc.in), &got)
+			if err == nil {
+				t.Fatalf("expect parsing to fail")
+			}
+			errStr := err.Error()
+			if !strings.Contains(errStr, tc.err) {
+				t.Fatalf("unexpected error string: got %q, want substring %q", errStr, tc.err)
+			}
+		})
+	}
+
+}

internal/tools/looker/lookergetconnections/lookergetconnections.go

@@ -0,0 +1,169 @@
+// Copyright 2025 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 lookergetconnections
+
+import (
+	"context"
+	"fmt"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/googleapis/genai-toolbox/internal/sources"
+	lookersrc "github.com/googleapis/genai-toolbox/internal/sources/looker"
+	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/tools/looker/lookercommon"
+	"github.com/googleapis/genai-toolbox/internal/util"
+
+	"github.com/looker-open-source/sdk-codegen/go/rtl"
+	v4 "github.com/looker-open-source/sdk-codegen/go/sdk/v4"
+)
+
+const kind string = "looker-get-connections"
+
+func init() {
+	if !tools.Register(kind, newConfig) {
+		panic(fmt.Sprintf("tool kind %q already registered", kind))
+	}
+}
+
+func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {
+	actual := Config{Name: name}
+	if err := decoder.DecodeContext(ctx, &actual); err != nil {
+		return nil, err
+	}
+	return actual, nil
+}
+
+type Config struct {
+	Name         string   `yaml:"name" validate:"required"`
+	Kind         string   `yaml:"kind" validate:"required"`
+	Source       string   `yaml:"source" validate:"required"`
+	Description  string   `yaml:"description" validate:"required"`
+	AuthRequired []string `yaml:"authRequired"`
+}
+
+// validate interface
+var _ tools.ToolConfig = Config{}
+
+func (cfg Config) ToolConfigKind() string {
+	return kind
+}
+
+func (cfg Config) Initialize(srcs map[string]sources.Source) (tools.Tool, error) {
+	// verify source exists
+	rawS, ok := srcs[cfg.Source]
+	if !ok {
+		return nil, fmt.Errorf("no source named %q configured", cfg.Source)
+	}
+
+	// verify the source is compatible
+	s, ok := rawS.(*lookersrc.Source)
+	if !ok {
+		return nil, fmt.Errorf("invalid source for %q tool: source kind must be `looker`", kind)
+	}
+
+	parameters := tools.Parameters{}
+
+	mcpManifest := tools.GetMcpManifest(cfg.Name, cfg.Description, cfg.AuthRequired, parameters)
+
+	// finish tool setup
+	return Tool{
+		Name:           cfg.Name,
+		Kind:           kind,
+		Parameters:     parameters,
+		AuthRequired:   cfg.AuthRequired,
+		UseClientOAuth: s.UseClientOAuth,
+		Client:         s.Client,
+		ApiSettings:    s.ApiSettings,
+		manifest: tools.Manifest{
+			Description:  cfg.Description,
+			Parameters:   parameters.Manifest(),
+			AuthRequired: cfg.AuthRequired,
+		},
+		mcpManifest:      mcpManifest,
+	}, nil
+}
+
+// validate interface
+var _ tools.Tool = Tool{}
+
+type Tool struct {
+	Name             string `yaml:"name"`
+	Kind             string `yaml:"kind"`
+	UseClientOAuth   bool
+	Client           *v4.LookerSDK
+	ApiSettings      *rtl.ApiSettings
+	AuthRequired     []string         `yaml:"authRequired"`
+	Parameters       tools.Parameters `yaml:"parameters"`
+	manifest         tools.Manifest
+	mcpManifest      tools.McpManifest
+}
+
+func (t Tool) Invoke(ctx context.Context, params tools.ParamValues, accessToken tools.AccessToken) (any, error) {
+	logger, err := util.LoggerFromContext(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("unable to get logger from ctx: %s", err)
+	}
+
+	sdk, err := lookercommon.GetLookerSDK(t.UseClientOAuth, t.ApiSettings, t.Client, accessToken)
+	if err != nil {
+		return nil, fmt.Errorf("error getting sdk: %w", err)
+	}
+	resp, err := sdk.AllConnections("name, dialect(name), database, schema",t.ApiSettings)
+	if err != nil {
+		return nil, fmt.Errorf("error making get_connections request: %s", err)
+	}
+
+	var data []any
+	for _, v := range resp {
+		vMap := make(map[string]any)
+		vMap["name"] = *v.Name
+		vMap["dialect_name"] = *v.Dialect.Name
+		if v.Database != nil {
+			vMap["database"] = *v.Database
+		}
+		if v.Schema != nil {
+			vMap["schema"] = *v.Schema
+		}
+		conn, err := sdk.ConnectionFeatures(*v.Name, "multiple_databases", t.ApiSettings)
+		if err != nil {
+			return nil, fmt.Errorf("error making get_connection_features request: %s", err)
+		}
+		vMap["supports_multiple_databases"] = *conn.MultipleDatabases
+		logger.DebugContext(ctx, "Converted to %v\n", vMap)
+		data = append(data, vMap)
+	}
+	logger.DebugContext(ctx, "data = ", data)
+
+	return data, nil
+}
+
+func (t Tool) ParseParams(data map[string]any, claims map[string]map[string]any) (tools.ParamValues, error) {
+	return tools.ParamValues{}, nil
+}
+
+func (t Tool) Manifest() tools.Manifest {
+	return t.manifest
+}
+
+func (t Tool) McpManifest() tools.McpManifest {
+	return t.mcpManifest
+}
+
+func (t Tool) Authorized(verifiedAuthServices []string) bool {
+	return tools.IsAuthorized(t.AuthRequired, verifiedAuthServices)
+}
+
+func (t Tool) RequiresClientAuthorization() bool {
+	return t.UseClientOAuth
+}

internal/tools/looker/lookergetconnections/lookergetconnections_test.go

@@ -0,0 +1,116 @@
+// Copyright 2025 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 lookergetconnections_test
+
+import (
+	"strings"
+	"testing"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/google/go-cmp/cmp"
+	"github.com/googleapis/genai-toolbox/internal/server"
+	"github.com/googleapis/genai-toolbox/internal/testutils"
+	lkr "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetconnections"
+)
+
+func TestParseFromYamlLookerGetConnections(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		want server.ToolConfigs
+	}{
+		{
+			desc: "basic example",
+			in: `
+			tools:
+				example_tool:
+					kind: looker-get-connections
+					source: my-instance
+					description: some description
+				`,
+			want: server.ToolConfigs{
+				"example_tool": lkr.Config{
+					Name:         "example_tool",
+					Kind:         "looker-get-connections",
+					Source:       "my-instance",
+					Description:  "some description",
+					AuthRequired: []string{},
+				},
+			},
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			got := struct {
+				Tools server.ToolConfigs `yaml:"tools"`
+			}{}
+			// Parse contents
+			err := yaml.UnmarshalContext(ctx, testutils.FormatYaml(tc.in), &got)
+			if err != nil {
+				t.Fatalf("unable to unmarshal: %s", err)
+			}
+			if diff := cmp.Diff(tc.want, got.Tools); diff != "" {
+				t.Fatalf("incorrect parse: diff %v", diff)
+			}
+		})
+	}
+
+}
+
+func TestFailParseFromYamlLookerGetConnections(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		err  string
+	}{
+		{
+			desc: "Invalid method",
+			in: `
+			tools:
+				example_tool:
+					kind: looker-get-connections
+					source: my-instance
+					method: GOT
+					description: some description
+			`,
+			err: "unable to parse tool \"example_tool\" as kind \"looker-get-connections\": [4:1] unknown field \"method\"\n   1 | authRequired: []\n   2 | description: some description\n   3 | kind: looker-get-connections\n>  4 | method: GOT\n       ^\n   5 | source: my-instance",
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			got := struct {
+				Tools server.ToolConfigs `yaml:"tools"`
+			}{}
+			// Parse contents
+			err := yaml.UnmarshalContext(ctx, testutils.FormatYaml(tc.in), &got)
+			if err == nil {
+				t.Fatalf("expect parsing to fail")
+			}
+			errStr := err.Error()
+			if !strings.Contains(errStr, tc.err) {
+				t.Fatalf("unexpected error string: got %q, want substring %q", errStr, tc.err)
+			}
+		})
+	}
+
+}

internal/tools/looker/lookergetconnectionschemas/lookergetconnectionschemas.go

@@ -0,0 +1,156 @@
+// Copyright 2025 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 lookergetconnectionschemas
+
+import (
+	"context"
+	"fmt"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/googleapis/genai-toolbox/internal/sources"
+	lookersrc "github.com/googleapis/genai-toolbox/internal/sources/looker"
+	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/tools/looker/lookercommon"
+
+	"github.com/looker-open-source/sdk-codegen/go/rtl"
+	v4 "github.com/looker-open-source/sdk-codegen/go/sdk/v4"
+)
+
+const kind string = "looker-get-connection-schemas"
+
+func init() {
+	if !tools.Register(kind, newConfig) {
+		panic(fmt.Sprintf("tool kind %q already registered", kind))
+	}
+}
+
+func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {
+	actual := Config{Name: name}
+	if err := decoder.DecodeContext(ctx, &actual); err != nil {
+		return nil, err
+	}
+	return actual, nil
+}
+
+type Config struct {
+	Name         string   `yaml:"name" validate:"required"`
+	Kind         string   `yaml:"kind" validate:"required"`
+	Source       string   `yaml:"source" validate:"required"`
+	Description  string   `yaml:"description" validate:"required"`
+	AuthRequired []string `yaml:"authRequired"`
+}
+
+// validate interface
+var _ tools.ToolConfig = Config{}
+
+func (cfg Config) ToolConfigKind() string {
+	return kind
+}
+
+func (cfg Config) Initialize(srcs map[string]sources.Source) (tools.Tool, error) {
+	// verify source exists
+	rawS, ok := srcs[cfg.Source]
+	if !ok {
+		return nil, fmt.Errorf("no source named %q configured", cfg.Source)
+	}
+
+	// verify the source is compatible
+	s, ok := rawS.(*lookersrc.Source)
+	if !ok {
+		return nil, fmt.Errorf("invalid source for %q tool: source kind must be `looker`", kind)
+	}
+
+	connParameter := tools.NewStringParameter("conn", "The connection containing the schemas.")
+	dbParameter := tools.NewStringParameterWithRequired("db", "The optional database to search", false)
+	parameters := tools.Parameters{connParameter, dbParameter}
+
+	mcpManifest := tools.GetMcpManifest(cfg.Name, cfg.Description, cfg.AuthRequired, parameters)
+
+	// finish tool setup
+	return Tool{
+		Name:           cfg.Name,
+		Kind:           kind,
+		Parameters:     parameters,
+		AuthRequired:   cfg.AuthRequired,
+		UseClientOAuth: s.UseClientOAuth,
+		Client:         s.Client,
+		ApiSettings:    s.ApiSettings,
+		manifest: tools.Manifest{
+			Description:  cfg.Description,
+			Parameters:   parameters.Manifest(),
+			AuthRequired: cfg.AuthRequired,
+		},
+		mcpManifest: mcpManifest,
+	}, nil
+}
+
+// validate interface
+var _ tools.Tool = Tool{}
+
+type Tool struct {
+	Name           string `yaml:"name"`
+	Kind           string `yaml:"kind"`
+	UseClientOAuth bool
+	Client         *v4.LookerSDK
+	ApiSettings    *rtl.ApiSettings
+	AuthRequired   []string         `yaml:"authRequired"`
+	Parameters     tools.Parameters `yaml:"parameters"`
+	manifest       tools.Manifest
+	mcpManifest    tools.McpManifest
+}
+
+func (t Tool) Invoke(ctx context.Context, params tools.ParamValues, accessToken tools.AccessToken) (any, error) {
+	mapParams := params.AsMap()
+	conn, ok := mapParams["conn"].(string)
+	if !ok {
+		return nil, fmt.Errorf("'conn' must be a string, got %T", mapParams["conn"])
+	}
+	db, _ := mapParams["db"].(string)
+
+	sdk, err := lookercommon.GetLookerSDK(t.UseClientOAuth, t.ApiSettings, t.Client, accessToken)
+	if err != nil {
+		return nil, fmt.Errorf("error getting sdk: %w", err)
+	}
+	req := v4.RequestConnectionSchemas{
+		ConnectionName: conn,
+	}
+	if db != "" {
+		req.Database = &db
+	}
+	resp, err := sdk.ConnectionSchemas(req, t.ApiSettings)
+	if err != nil {
+		return nil, fmt.Errorf("error making get_connection_schemas request: %s", err)
+	}
+	return resp, nil
+}
+
+func (t Tool) ParseParams(data map[string]any, claims map[string]map[string]any) (tools.ParamValues, error) {
+	return tools.ParseParams(t.Parameters, data, claims)
+}
+
+func (t Tool) Manifest() tools.Manifest {
+	return t.manifest
+}
+
+func (t Tool) McpManifest() tools.McpManifest {
+	return t.mcpManifest
+}
+
+func (t Tool) Authorized(verifiedAuthServices []string) bool {
+	return tools.IsAuthorized(t.AuthRequired, verifiedAuthServices)
+}
+
+func (t Tool) RequiresClientAuthorization() bool {
+	return t.UseClientOAuth
+}

internal/tools/looker/lookergetconnectionschemas/lookergetconnectionschemas_test.go

@@ -0,0 +1,116 @@
+// Copyright 2025 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 lookergetconnectionschemas_test
+
+import (
+	"strings"
+	"testing"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/google/go-cmp/cmp"
+	"github.com/googleapis/genai-toolbox/internal/server"
+	"github.com/googleapis/genai-toolbox/internal/testutils"
+	lkr "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetconnectionschemas"
+)
+
+func TestParseFromYamlLookerGetConnectionSchemas(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		want server.ToolConfigs
+	}{
+		{
+			desc: "basic example",
+			in: `
+			tools:
+				example_tool:
+					kind: looker-get-connection-schemas
+					source: my-instance
+					description: some description
+				`,
+			want: server.ToolConfigs{
+				"example_tool": lkr.Config{
+					Name:         "example_tool",
+					Kind:         "looker-get-connection-schemas",
+					Source:       "my-instance",
+					Description:  "some description",
+					AuthRequired: []string{},
+				},
+			},
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			got := struct {
+				Tools server.ToolConfigs `yaml:"tools"`
+			}{}
+			// Parse contents
+			err := yaml.UnmarshalContext(ctx, testutils.FormatYaml(tc.in), &got)
+			if err != nil {
+				t.Fatalf("unable to unmarshal: %s", err)
+			}
+			if diff := cmp.Diff(tc.want, got.Tools); diff != "" {
+				t.Fatalf("incorrect parse: diff %v", diff)
+			}
+		})
+	}
+
+}
+
+func TestFailParseFromYamlLookerGetConnectionSchemas(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		err  string
+	}{
+		{
+			desc: "Invalid method",
+			in: `
+			tools:
+				example_tool:
+					kind: looker-get-connection-schemas
+					source: my-instance
+					method: GOT
+					description: some description
+			`,
+			err: "unable to parse tool \"example_tool\" as kind \"looker-get-connection-schemas\": [4:1] unknown field \"method\"\n   1 | authRequired: []\n   2 | description: some description\n   3 | kind: looker-get-connection-schemas\n>  4 | method: GOT\n       ^\n   5 | source: my-instance",
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			got := struct {
+				Tools server.ToolConfigs `yaml:"tools"`
+			}{}
+			// Parse contents
+			err := yaml.UnmarshalContext(ctx, testutils.FormatYaml(tc.in), &got)
+			if err == nil {
+				t.Fatalf("expect parsing to fail")
+			}
+			errStr := err.Error()
+			if !strings.Contains(errStr, tc.err) {
+				t.Fatalf("unexpected error string: got %q, want substring %q", errStr, tc.err)
+			}
+		})
+	}
+
+}

internal/tools/looker/lookergetconnectiontablecolumns/lookergetconnectiontablecolumns.go

@@ -0,0 +1,193 @@
+// Copyright 2025 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 lookergetconnectiontablecolumns
+
+import (
+	"context"
+	"fmt"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/googleapis/genai-toolbox/internal/sources"
+	lookersrc "github.com/googleapis/genai-toolbox/internal/sources/looker"
+	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/tools/looker/lookercommon"
+	"github.com/googleapis/genai-toolbox/internal/util"
+
+	"github.com/looker-open-source/sdk-codegen/go/rtl"
+	v4 "github.com/looker-open-source/sdk-codegen/go/sdk/v4"
+)
+
+const kind string = "looker-get-connection-table-columns"
+
+func init() {
+	if !tools.Register(kind, newConfig) {
+		panic(fmt.Sprintf("tool kind %q already registered", kind))
+	}
+}
+
+func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {
+	actual := Config{Name: name}
+	if err := decoder.DecodeContext(ctx, &actual); err != nil {
+		return nil, err
+	}
+	return actual, nil
+}
+
+type Config struct {
+	Name         string   `yaml:"name" validate:"required"`
+	Kind         string   `yaml:"kind" validate:"required"`
+	Source       string   `yaml:"source" validate:"required"`
+	Description  string   `yaml:"description" validate:"required"`
+	AuthRequired []string `yaml:"authRequired"`
+}
+
+// validate interface
+var _ tools.ToolConfig = Config{}
+
+func (cfg Config) ToolConfigKind() string {
+	return kind
+}
+
+func (cfg Config) Initialize(srcs map[string]sources.Source) (tools.Tool, error) {
+	// verify source exists
+	rawS, ok := srcs[cfg.Source]
+	if !ok {
+		return nil, fmt.Errorf("no source named %q configured", cfg.Source)
+	}
+
+	// verify the source is compatible
+	s, ok := rawS.(*lookersrc.Source)
+	if !ok {
+		return nil, fmt.Errorf("invalid source for %q tool: source kind must be `looker`", kind)
+	}
+
+	connParameter := tools.NewStringParameter("conn", "The connection containing the tables.")
+	dbParameter := tools.NewStringParameterWithRequired("db", "The optional database to search", false)
+	schemaParameter := tools.NewStringParameter("schema", "The schema containing the tables.")
+	tablesParameter := tools.NewStringParameter("tables", "A comma separated list of tables containing the columns.")
+	parameters := tools.Parameters{connParameter, dbParameter, schemaParameter, tablesParameter}
+
+	mcpManifest := tools.GetMcpManifest(cfg.Name, cfg.Description, cfg.AuthRequired, parameters)
+
+	// finish tool setup
+	return Tool{
+		Name:           cfg.Name,
+		Kind:           kind,
+		Parameters:     parameters,
+		AuthRequired:   cfg.AuthRequired,
+		UseClientOAuth: s.UseClientOAuth,
+		Client:         s.Client,
+		ApiSettings:    s.ApiSettings,
+		manifest: tools.Manifest{
+			Description:  cfg.Description,
+			Parameters:   parameters.Manifest(),
+			AuthRequired: cfg.AuthRequired,
+		},
+		mcpManifest: mcpManifest,
+	}, nil
+}
+
+// validate interface
+var _ tools.Tool = Tool{}
+
+type Tool struct {
+	Name           string `yaml:"name"`
+	Kind           string `yaml:"kind"`
+	UseClientOAuth bool
+	Client         *v4.LookerSDK
+	ApiSettings    *rtl.ApiSettings
+	AuthRequired   []string         `yaml:"authRequired"`
+	Parameters     tools.Parameters `yaml:"parameters"`
+	manifest       tools.Manifest
+	mcpManifest    tools.McpManifest
+}
+
+func (t Tool) Invoke(ctx context.Context, params tools.ParamValues, accessToken tools.AccessToken) (any, error) {
+	logger, err := util.LoggerFromContext(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("unable to get logger from ctx: %s", err)
+	}
+	mapParams := params.AsMap()
+	conn, ok := mapParams["conn"].(string)
+	if !ok {
+		return nil, fmt.Errorf("'conn' must be a string, got %T", mapParams["conn"])
+	}
+	db, _ := mapParams["db"].(string)
+	schema, ok := mapParams["schema"].(string)
+	if !ok {
+		return nil, fmt.Errorf("'schema' must be a string, got %T", mapParams["schema"])
+	}
+	tables, ok := mapParams["tables"].(string)
+	if !ok {
+		return nil, fmt.Errorf("'tables' must be a string, got %T", mapParams["tables"])
+	}
+
+	sdk, err := lookercommon.GetLookerSDK(t.UseClientOAuth, t.ApiSettings, t.Client, accessToken)
+	if err != nil {
+		return nil, fmt.Errorf("error getting sdk: %w", err)
+	}
+	req := v4.RequestConnectionColumns{
+		ConnectionName: conn,
+		SchemaName:     &schema,
+		TableNames:     &tables,
+	}
+	if db != "" {
+		req.Database = &db
+	}
+	resp, err := sdk.ConnectionColumns(req, t.ApiSettings)
+	if err != nil {
+		return nil, fmt.Errorf("error making get_connection_table_columns request: %s", err)
+	}
+	var data []any
+	for _, t := range resp {
+		vMap := make(map[string]any)
+		vMap["table_name"] = *t.Name
+		vMap["sql_escaped_table_name"] = *t.SqlEscapedName
+		vMap["schema_name"] = *t.SchemaName
+		var columnData []any
+		for _, c := range *t.Columns {
+			vMap2 := make(map[string]any)
+			vMap2["column_name"] = *c.Name
+			vMap2["sql_escaped_column_name"] = *c.SqlEscapedName
+			vMap2["data_type_database"] = *c.DataTypeDatabase
+			vMap2["data_type_looker"] = *c.DataTypeLooker
+			columnData = append(columnData, vMap2)
+		}
+		vMap["columns"] = columnData
+		data = append(data, vMap)
+	}
+	logger.DebugContext(ctx, "data = ", data)
+
+	return data, nil
+}
+
+func (t Tool) ParseParams(data map[string]any, claims map[string]map[string]any) (tools.ParamValues, error) {
+	return tools.ParseParams(t.Parameters, data, claims)
+}
+
+func (t Tool) Manifest() tools.Manifest {
+	return t.manifest
+}
+
+func (t Tool) McpManifest() tools.McpManifest {
+	return t.mcpManifest
+}
+
+func (t Tool) Authorized(verifiedAuthServices []string) bool {
+	return tools.IsAuthorized(t.AuthRequired, verifiedAuthServices)
+}
+
+func (t Tool) RequiresClientAuthorization() bool {
+	return t.UseClientOAuth
+}

internal/tools/looker/lookergetconnectiontablecolumns/lookergetconnectiontablecolumns_test.go

@@ -0,0 +1,116 @@
+// Copyright 2025 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 lookergetconnectiontablecolumns_test
+
+import (
+	"strings"
+	"testing"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/google/go-cmp/cmp"
+	"github.com/googleapis/genai-toolbox/internal/server"
+	"github.com/googleapis/genai-toolbox/internal/testutils"
+	lkr "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetconnectiontablecolumns"
+)
+
+func TestParseFromYamlLookerGetConnectionTableColumns(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		want server.ToolConfigs
+	}{
+		{
+			desc: "basic example",
+			in: `
+			tools:
+				example_tool:
+					kind: looker-get-connection-table-columns
+					source: my-instance
+					description: some description
+				`,
+			want: server.ToolConfigs{
+				"example_tool": lkr.Config{
+					Name:         "example_tool",
+					Kind:         "looker-get-connection-table-columns",
+					Source:       "my-instance",
+					Description:  "some description",
+					AuthRequired: []string{},
+				},
+			},
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			got := struct {
+				Tools server.ToolConfigs `yaml:"tools"`
+			}{}
+			// Parse contents
+			err := yaml.UnmarshalContext(ctx, testutils.FormatYaml(tc.in), &got)
+			if err != nil {
+				t.Fatalf("unable to unmarshal: %s", err)
+			}
+			if diff := cmp.Diff(tc.want, got.Tools); diff != "" {
+				t.Fatalf("incorrect parse: diff %v", diff)
+			}
+		})
+	}
+
+}
+
+func TestFailParseFromYamlLookerGetConnectionTableColumns(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		err  string
+	}{
+		{
+			desc: "Invalid method",
+			in: `
+			tools:
+				example_tool:
+					kind: looker-get-connection-table-columns
+					source: my-instance
+					method: GOT
+					description: some description
+			`,
+			err: "unable to parse tool \"example_tool\" as kind \"looker-get-connection-table-columns\": [4:1] unknown field \"method\"\n   1 | authRequired: []\n   2 | description: some description\n   3 | kind: looker-get-connection-table-columns\n>  4 | method: GOT\n       ^\n   5 | source: my-instance",
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			got := struct {
+				Tools server.ToolConfigs `yaml:"tools"`
+			}{}
+			// Parse contents
+			err := yaml.UnmarshalContext(ctx, testutils.FormatYaml(tc.in), &got)
+			if err == nil {
+				t.Fatalf("expect parsing to fail")
+			}
+			errStr := err.Error()
+			if !strings.Contains(errStr, tc.err) {
+				t.Fatalf("unexpected error string: got %q, want substring %q", errStr, tc.err)
+			}
+		})
+	}
+
+}

internal/tools/looker/lookergetconnectiontables/lookergetconnectiontables.go

@@ -0,0 +1,184 @@
+// Copyright 2025 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 lookergetconnectiontables
+
+import (
+	"context"
+	"fmt"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/googleapis/genai-toolbox/internal/sources"
+	lookersrc "github.com/googleapis/genai-toolbox/internal/sources/looker"
+	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/tools/looker/lookercommon"
+	"github.com/googleapis/genai-toolbox/internal/util"
+
+	"github.com/looker-open-source/sdk-codegen/go/rtl"
+	v4 "github.com/looker-open-source/sdk-codegen/go/sdk/v4"
+)
+
+const kind string = "looker-get-connection-tables"
+
+func init() {
+	if !tools.Register(kind, newConfig) {
+		panic(fmt.Sprintf("tool kind %q already registered", kind))
+	}
+}
+
+func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {
+	actual := Config{Name: name}
+	if err := decoder.DecodeContext(ctx, &actual); err != nil {
+		return nil, err
+	}
+	return actual, nil
+}
+
+type Config struct {
+	Name         string   `yaml:"name" validate:"required"`
+	Kind         string   `yaml:"kind" validate:"required"`
+	Source       string   `yaml:"source" validate:"required"`
+	Description  string   `yaml:"description" validate:"required"`
+	AuthRequired []string `yaml:"authRequired"`
+}
+
+// validate interface
+var _ tools.ToolConfig = Config{}
+
+func (cfg Config) ToolConfigKind() string {
+	return kind
+}
+
+func (cfg Config) Initialize(srcs map[string]sources.Source) (tools.Tool, error) {
+	// verify source exists
+	rawS, ok := srcs[cfg.Source]
+	if !ok {
+		return nil, fmt.Errorf("no source named %q configured", cfg.Source)
+	}
+
+	// verify the source is compatible
+	s, ok := rawS.(*lookersrc.Source)
+	if !ok {
+		return nil, fmt.Errorf("invalid source for %q tool: source kind must be `looker`", kind)
+	}
+
+	connParameter := tools.NewStringParameter("conn", "The connection containing the tables.")
+	dbParameter := tools.NewStringParameterWithRequired("db", "The optional database to search", false)
+	schemaParameter := tools.NewStringParameter("schema", "The schema containing the tables.")
+	parameters := tools.Parameters{connParameter, dbParameter, schemaParameter}
+
+	mcpManifest := tools.GetMcpManifest(cfg.Name, cfg.Description, cfg.AuthRequired, parameters)
+
+	// finish tool setup
+	return Tool{
+		Name:           cfg.Name,
+		Kind:           kind,
+		Parameters:     parameters,
+		AuthRequired:   cfg.AuthRequired,
+		UseClientOAuth: s.UseClientOAuth,
+		Client:         s.Client,
+		ApiSettings:    s.ApiSettings,
+		manifest: tools.Manifest{
+			Description:  cfg.Description,
+			Parameters:   parameters.Manifest(),
+			AuthRequired: cfg.AuthRequired,
+		},
+		mcpManifest: mcpManifest,
+	}, nil
+}
+
+// validate interface
+var _ tools.Tool = Tool{}
+
+type Tool struct {
+	Name           string `yaml:"name"`
+	Kind           string `yaml:"kind"`
+	UseClientOAuth bool
+	Client         *v4.LookerSDK
+	ApiSettings    *rtl.ApiSettings
+	AuthRequired   []string         `yaml:"authRequired"`
+	Parameters     tools.Parameters `yaml:"parameters"`
+	manifest       tools.Manifest
+	mcpManifest    tools.McpManifest
+}
+
+func (t Tool) Invoke(ctx context.Context, params tools.ParamValues, accessToken tools.AccessToken) (any, error) {
+	logger, err := util.LoggerFromContext(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("unable to get logger from ctx: %s", err)
+	}
+	mapParams := params.AsMap()
+	conn, ok := mapParams["conn"].(string)
+	if !ok {
+		return nil, fmt.Errorf("'conn' must be a string, got %T", mapParams["conn"])
+	}
+	db, _ := mapParams["db"].(string)
+	schema, ok := mapParams["schema"].(string)
+	if !ok {
+		return nil, fmt.Errorf("'schema' must be a string, got %T", mapParams["schema"])
+	}
+
+	sdk, err := lookercommon.GetLookerSDK(t.UseClientOAuth, t.ApiSettings, t.Client, accessToken)
+	if err != nil {
+		return nil, fmt.Errorf("error getting sdk: %w", err)
+	}
+	req := v4.RequestConnectionTables{
+		ConnectionName: conn,
+		SchemaName:     &schema,
+	}
+	if db != "" {
+		req.Database = &db
+	}
+	resp, err := sdk.ConnectionTables(req, t.ApiSettings)
+	if err != nil {
+		return nil, fmt.Errorf("error making get_connection_tables request: %s", err)
+	}
+	var data []any
+	for _, s := range resp {
+		vMap := make(map[string]any)
+		vMap["schema_name"] = *s.Name
+		vMap["is_default"] = *s.IsDefault
+		var tableData []any
+		for _, t := range *s.Tables {
+			vMap2 := make(map[string]any)
+			vMap2["table_name"] = *t.Name
+			vMap2["sql_escaped_name"] = *t.SqlEscapedName
+			tableData = append(tableData, vMap2)
+		}
+		vMap["tables"] = tableData
+		data = append(data, vMap)
+	}
+	logger.DebugContext(ctx, "data = ", data)
+
+	return data, nil
+}
+
+func (t Tool) ParseParams(data map[string]any, claims map[string]map[string]any) (tools.ParamValues, error) {
+	return tools.ParseParams(t.Parameters, data, claims)
+}
+
+func (t Tool) Manifest() tools.Manifest {
+	return t.manifest
+}
+
+func (t Tool) McpManifest() tools.McpManifest {
+	return t.mcpManifest
+}
+
+func (t Tool) Authorized(verifiedAuthServices []string) bool {
+	return tools.IsAuthorized(t.AuthRequired, verifiedAuthServices)
+}
+
+func (t Tool) RequiresClientAuthorization() bool {
+	return t.UseClientOAuth
+}

internal/tools/looker/lookergetconnectiontables/lookergetconnectiontables_test.go

@@ -0,0 +1,116 @@
+// Copyright 2025 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 lookergetconnectiontables_test
+
+import (
+	"strings"
+	"testing"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/google/go-cmp/cmp"
+	"github.com/googleapis/genai-toolbox/internal/server"
+	"github.com/googleapis/genai-toolbox/internal/testutils"
+	lkr "github.com/googleapis/genai-toolbox/internal/tools/looker/lookergetconnectiontables"
+)
+
+func TestParseFromYamlLookerGetConnectionTables(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		want server.ToolConfigs
+	}{
+		{
+			desc: "basic example",
+			in: `
+			tools:
+				example_tool:
+					kind: looker-get-connection-tables
+					source: my-instance
+					description: some description
+				`,
+			want: server.ToolConfigs{
+				"example_tool": lkr.Config{
+					Name:         "example_tool",
+					Kind:         "looker-get-connection-tables",
+					Source:       "my-instance",
+					Description:  "some description",
+					AuthRequired: []string{},
+				},
+			},
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			got := struct {
+				Tools server.ToolConfigs `yaml:"tools"`
+			}{}
+			// Parse contents
+			err := yaml.UnmarshalContext(ctx, testutils.FormatYaml(tc.in), &got)
+			if err != nil {
+				t.Fatalf("unable to unmarshal: %s", err)
+			}
+			if diff := cmp.Diff(tc.want, got.Tools); diff != "" {
+				t.Fatalf("incorrect parse: diff %v", diff)
+			}
+		})
+	}
+
+}
+
+func TestFailParseFromYamlLookerGetConnectionTables(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		err  string
+	}{
+		{
+			desc: "Invalid method",
+			in: `
+			tools:
+				example_tool:
+					kind: looker-get-connection-tables
+					source: my-instance
+					method: GOT
+					description: some description
+			`,
+			err: "unable to parse tool \"example_tool\" as kind \"looker-get-connection-tables\": [4:1] unknown field \"method\"\n   1 | authRequired: []\n   2 | description: some description\n   3 | kind: looker-get-connection-tables\n>  4 | method: GOT\n       ^\n   5 | source: my-instance",
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			got := struct {
+				Tools server.ToolConfigs `yaml:"tools"`
+			}{}
+			// Parse contents
+			err := yaml.UnmarshalContext(ctx, testutils.FormatYaml(tc.in), &got)
+			if err == nil {
+				t.Fatalf("expect parsing to fail")
+			}
+			errStr := err.Error()
+			if !strings.Contains(errStr, tc.err) {
+				t.Fatalf("unexpected error string: got %q, want substring %q", errStr, tc.err)
+			}
+		})
+	}
+
+}

internal/tools/looker/lookergetmodels/lookergetmodels.go

@@ -142,6 +142,7 @@ func (t Tool) Invoke(ctx context.Context, params tools.ParamValues, accessToken
 		vMap["label"] = *v.Label
 		vMap["name"] = *v.Name
 		vMap["project_name"] = *v.ProjectName
+		vMap["connections"] = *v.AllowedDbConnectionNames
 		logger.DebugContext(ctx, "Converted to %v\n", vMap)
 		data = append(data, vMap)
 	}

tests/looker/looker_integration_test.go

@@ -199,6 +199,31 @@ func TestLooker(t *testing.T) {
 				"source":      "my-instance",
 				"description": "Simple tool to test end to end functionality.",
 			},
+			"get_connections": map[string]any{
+				"kind":        "looker-get-connections",
+				"source":      "my-instance",
+				"description": "Simple tool to test end to end functionality.",
+			},
+			"get_connection_schemas": map[string]any{
+				"kind":        "looker-get-connection-schemas",
+				"source":      "my-instance",
+				"description": "Simple tool to test end to end functionality.",
+			},
+			"get_connection_databases": map[string]any{
+				"kind":        "looker-get-connection-databases",
+				"source":      "my-instance",
+				"description": "Simple tool to test end to end functionality.",
+			},
+			"get_connection_tables": map[string]any{
+				"kind":        "looker-get-connection-tables",
+				"source":      "my-instance",
+				"description": "Simple tool to test end to end functionality.",
+			},
+			"get_connection_table_columns": map[string]any{
+				"kind":        "looker-get-connection-table-columns",
+				"source":      "my-instance",
+				"description": "Simple tool to test end to end functionality.",
+			},
 		},
 	}
 
@@ -992,8 +1017,127 @@ func TestLooker(t *testing.T) {
 			},
 		},
 	)
+	tests.RunToolGetTestByName(t, "get_connections",
+		map[string]any{
+			"get_connections": map[string]any{
+				"description":  "Simple tool to test end to end functionality.",
+				"authRequired": []any{},
+				"parameters":   []any{},
+			},
+		},
+	)
+	tests.RunToolGetTestByName(t, "get_connection_schemas",
+		map[string]any{
+			"get_connection_schemas": map[string]any{
+				"description":  "Simple tool to test end to end functionality.",
+				"authRequired": []any{},
+				"parameters": []any{
+					map[string]any{
+						"authSources": []any{},
+						"description": "The connection containing the schemas.",
+						"name":        "conn",
+						"required":    true,
+						"type":        "string",
+					},
+					map[string]any{
+						"authSources": []any{},
+						"description": "The optional database to search",
+						"name":        "db",
+						"required":    false,
+						"type":        "string",
+					},
+				},
+			},
+		},
+	)
+	tests.RunToolGetTestByName(t, "get_connection_databases",
+		map[string]any{
+			"get_connection_databases": map[string]any{
+				"description":  "Simple tool to test end to end functionality.",
+				"authRequired": []any{},
+				"parameters": []any{
+					map[string]any{
+						"authSources": []any{},
+						"description": "The connection containing the databases.",
+						"name":        "conn",
+						"required":    true,
+						"type":        "string",
+					},
+				},
+			},
+		},
+	)
+	tests.RunToolGetTestByName(t, "get_connection_tables",
+		map[string]any{
+			"get_connection_tables": map[string]any{
+				"description":  "Simple tool to test end to end functionality.",
+				"authRequired": []any{},
+				"parameters": []any{
+					map[string]any{
+						"authSources": []any{},
+						"description": "The connection containing the tables.",
+						"name":        "conn",
+						"required":    true,
+						"type":        "string",
+					},
+					map[string]any{
+						"authSources": []any{},
+						"description": "The optional database to search",
+						"name":        "db",
+						"required":    false,
+						"type":        "string",
+					},
+					map[string]any{
+						"authSources": []any{},
+						"description": "The schema containing the tables.",
+						"name":        "schema",
+						"required":    true,
+						"type":        "string",
+					},
+				},
+			},
+		},
+	)
+	tests.RunToolGetTestByName(t, "get_connection_table_columns",
+		map[string]any{
+			"get_connection_table_columns": map[string]any{
+				"description":  "Simple tool to test end to end functionality.",
+				"authRequired": []any{},
+				"parameters": []any{
+					map[string]any{
+						"authSources": []any{},
+						"description": "The connection containing the tables.",
+						"name":        "conn",
+						"required":    true,
+						"type":        "string",
+					},
+					map[string]any{
+						"authSources": []any{},
+						"description": "The optional database to search",
+						"name":        "db",
+						"required":    false,
+						"type":        "string",
+					},
+					map[string]any{
+						"authSources": []any{},
+						"description": "The schema containing the tables.",
+						"name":        "schema",
+						"required":    true,
+						"type":        "string",
+					},
+					map[string]any{
+						"authSources": []any{},
+						"description": "A comma separated list of tables containing the columns.",
+						"name":        "tables",
+						"required":    true,
+						"type":        "string",
+					},
+				},
+			},
+		},
+	)
 
-	wantResult := "{\"label\":\"System Activity\",\"name\":\"system__activity\",\"project_name\":\"system__activity\"}"
+	wantResult := "{\"connections\":[],\"label\":\"System Activity\",\"name\":\"system__activity\",\"project_name\":\"system__activity\"}"
 	tests.RunToolInvokeSimpleTest(t, "get_models", wantResult)
 
 	wantResult = "{\"description\":\"Data about Look and dashboard usage, including frequency of views, favoriting, scheduling, embedding, and access via the API. Also includes details about individual Looks and dashboards.\",\"group_label\":\"System Activity\",\"label\":\"Content Usage\",\"name\":\"content_usage\"}"
@@ -1070,6 +1214,21 @@ func TestLooker(t *testing.T) {
 
 	wantResult = "production"
 	tests.RunToolInvokeParametersTest(t, "dev_mode", []byte(`{"devMode": false}`), wantResult)
+
+	wantResult = "thelook"
+	tests.RunToolInvokeSimpleTest(t, "get_connections", wantResult)
+
+	wantResult = "{\"name\":\"demo_db\",\"is_default\":true}"
+	tests.RunToolInvokeParametersTest(t, "get_connection_schemas", []byte(`{"conn": "thelook"}`), wantResult)
+
+	wantResult = "[]"
+	tests.RunToolInvokeParametersTest(t, "get_connection_databases", []byte(`{"conn": "thelook"}`), wantResult)
+
+	wantResult = "Employees"
+	tests.RunToolInvokeParametersTest(t, "get_connection_tables", []byte(`{"conn": "thelook", "schema": "demo_db"}`), wantResult)
+
+	wantResult = "{\"column_name\":\"EmpID\",\"data_type_database\":\"int\",\"data_type_looker\":\"number\",\"sql_escaped_column_name\":\"EmpID\"}"
+	tests.RunToolInvokeParametersTest(t, "get_connection_table_columns", []byte(`{"conn": "thelook", "schema": "demo_db", "tables": "Employees"}`), wantResult)
 }
 
 func runConversationalAnalytics(t *testing.T, modelName, exploreName string) {