Merge branch 'main' into processing-adk-go

Co-authored-by: Averi Kitsch <akitsch@google.com>

.ci/sample_tests/pre_post_processing/go.integration.cloudbuild.yaml

@@ -0,0 +1,57 @@
+# 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.
+
+steps:
+  - name: "${_IMAGE}"
+    id: "go-pre-post-processing-test"
+    entrypoint: "bash"
+    args:
+      - -c
+      - |
+        set -ex
+        chmod +x .ci/sample_tests/run_tests.sh
+        .ci/sample_tests/run_tests.sh
+    env:
+      - "CLOUD_SQL_INSTANCE=${_CLOUD_SQL_INSTANCE}"
+      - "GCP_PROJECT=${_GCP_PROJECT}"
+      - "DATABASE_NAME=${_DATABASE_NAME}"
+      - "DB_USER=${_DB_USER}"
+      - "TARGET_ROOT=${_TARGET_ROOT}"
+      - "TARGET_LANG=${_TARGET_LANG}"
+      - "TABLE_NAME=${_TABLE_NAME}"
+      - "SQL_FILE=${_SQL_FILE}"
+      - "AGENT_FILE_PATTERN=${_AGENT_FILE_PATTERN}"
+    secretEnv: ["TOOLS_YAML_CONTENT", "GOOGLE_API_KEY", "DB_PASSWORD"]
+
+availableSecrets:
+  secretManager:
+    - versionName: projects/${_GCP_PROJECT}/secrets/${_TOOLS_YAML_SECRET}/versions/5
+      env: "TOOLS_YAML_CONTENT"
+    - versionName: projects/${_GCP_PROJECT_NUMBER}/secrets/${_API_KEY_SECRET}/versions/latest
+      env: "GOOGLE_API_KEY"
+    - versionName: projects/${_GCP_PROJECT}/secrets/${_DB_PASS_SECRET}/versions/latest
+      env: "DB_PASSWORD"
+
+timeout: 1200s
+
+substitutions:
+  _TARGET_LANG: "go"
+  _IMAGE: "golang:1.25.1"
+  _TARGET_ROOT: "docs/en/samples/pre_post_processing/go"
+  _TABLE_NAME: "hotels_go_pre_post_processing"
+  _SQL_FILE: ".ci/sample_tests/setup_hotels.sql"
+  _AGENT_FILE_PATTERN: "agent.go"
+
+options:
+  logging: CLOUD_LOGGING_ONLY

docs/en/samples/pre_post_processing/go.md

@@ -0,0 +1,38 @@
+---
+title: "Go"
+type: docs
+weight: 3
+description: >
+  How to add pre- and post- processing to your Agents using Go.
+---
+
+## Prerequisites
+
+This tutorial assumes that you have set up Toolbox with a basic agent as described in the [local quickstart](../../getting-started/local_quickstart_go.md).
+
+This guide demonstrates how to implement these patterns in your Toolbox applications.
+
+## Implementation
+
+{{< tabpane persist=header >}}
+{{% tab header="ADK" text=true %}}
+The following example demonstrates how to use the `beforeToolCallback` and `afterToolCallback` hooks in the ADK `LlmAgent` to implement pre and post processing logic.
+
+```go
+{{< include "go/adk/agent.go" >}}
+```
+
+You can also add model-level (`beforeModelCallback`, `afterModelCallback`) and agent-level (`beforeAgentCallback`, `afterAgentCallback`) hooks to intercept messages at different stages of the execution loop.
+
+For more information, see the [ADK Callbacks documentation](https://google.github.io/adk-docs/callbacks/types-of-callbacks/).{{% /tab %}}
+{{< /tabpane >}}
+
+## Results
+
+The output should look similar to the following. Note that exact responses may vary due to the non-deterministic nature of LLMs and differences between orchestration frameworks.
+
+```
+AI: Booking Confirmed! You earned 500 Loyalty Points with this stay.
+
+AI: Error: Maximum stay duration is 14 days.
+```

docs/en/samples/pre_post_processing/go/adk/agent.go

@@ -0,0 +1,176 @@
+/*
+ * 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 main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/googleapis/mcp-toolbox-sdk-go/tbadk"
+	"google.golang.org/adk/agent"
+	"google.golang.org/adk/agent/llmagent"
+	"google.golang.org/adk/model/gemini"
+	"google.golang.org/adk/runner"
+	"google.golang.org/adk/session"
+	"google.golang.org/adk/tool"
+	"google.golang.org/genai"
+)
+
+const systemPrompt = `
+  You're a helpful hotel assistant. You handle hotel searching, booking and
+  cancellations. When the user searches for a hotel, mention it's name, id,
+  location and price tier. Always mention hotel ids while performing any
+  searches. This is very important for any operations. For any bookings or
+  cancellations, please provide the appropriate confirmation. Be sure to
+  update checkin or checkout dates if mentioned by the user.
+  Don't ask for confirmations from the user.
+`
+
+var queries = []string{
+	"Book hotel with id 3.",
+	"Update my hotel with id 3 with checkin date 2025-01-04 and checkout date 2025-01-20",
+}
+
+// Pre-processing
+func beforeToolCallback(ctx tool.Context, tool tool.Tool, args map[string]any) (map[string]any, error) {
+
+	fmt.Printf("POLICY CHECK: Intercepting '%s'\n", tool.Name())
+	if tool.Name() == "update-hotel" {
+		checkinStr, okCheckin := args["checkin_date"].(string)
+		checkoutStr, okCheckout := args["checkout_date"].(string)
+
+		if okCheckin && okCheckout {
+			startDate, errStart := time.Parse("2006-01-02", checkinStr)
+			endDate, errEnd := time.Parse("2006-01-02", checkoutStr)
+			if errStart != nil || errEnd != nil {
+				return nil, nil
+			}
+
+			duration := endDate.Sub(startDate).Hours() / 24
+			if duration > 14 {
+				fmt.Println("BLOCKED: Stay too long")
+				return map[string]any{"Error": "Maximum stay duration is 14 days."}, nil
+			}
+		}
+	}
+	return nil, nil
+}
+
+// Post-processing
+func afterToolCallback(ctx tool.Context, tool tool.Tool, args, result map[string]any, err error) (map[string]any, error) {
+	resultStr := fmt.Sprintf("%v", result)
+
+	if tool.Name() == "book-hotel" {
+		if err != nil {
+			return nil, err
+		}
+		if _, ok := result["Error"]; !ok && !strings.Contains(resultStr, "Error") {
+			const loyaltyBonus = 500
+			enrichedResult := fmt.Sprintf("Booking Confirmed!\n You earned %d Loyalty Points with this stay.\n\nSystem Details: %s", loyaltyBonus, resultStr)
+			return map[string]any{"confirmation": enrichedResult}, nil
+		}
+	}
+	return result, nil
+}
+
+func main() {
+	genaiKey := os.Getenv("GOOGLE_API_KEY")
+	toolboxURL := "http://localhost:5000"
+	ctx := context.Background()
+
+	toolboxClient, err := tbadk.NewToolboxClient(toolboxURL)
+	if err != nil {
+		log.Fatalf("Failed to create MCP Toolbox client: %v", err)
+	}
+
+	toolsetName := "my-toolset"
+	mcpTools, err := toolboxClient.LoadToolset(toolsetName, ctx)
+	if err != nil {
+		log.Fatalf("Failed to load MCP toolset '%s': %v\nMake sure your Toolbox server is running.", toolsetName, err)
+	}
+
+	model, err := gemini.NewModel(ctx, "gemini-2.5-flash", &genai.ClientConfig{
+		APIKey: genaiKey,
+	})
+	if err != nil {
+		log.Fatalf("Failed to create model: %v", err)
+	}
+
+	tools := make([]tool.Tool, len(mcpTools))
+	for i := range mcpTools {
+		tools[i] = &mcpTools[i]
+	}
+	llmagent, err := llmagent.New(llmagent.Config{
+		Name:                "hotel_assistant",
+		Model:               model,
+		Description:         "Agent to answer questions about hotels.",
+		Instruction:         systemPrompt,
+		Tools:               tools,
+		// Add pre- and post- processing hooks
+		BeforeToolCallbacks: []llmagent.BeforeToolCallback{beforeToolCallback},
+		AfterToolCallbacks:  []llmagent.AfterToolCallback{afterToolCallback},
+	})
+	if err != nil {
+		log.Fatalf("Failed to create agent: %v", err)
+	}
+
+	appName := "hotel_assistant"
+	userID := "user-123"
+	sessionService := session.InMemoryService()
+	respSess, err := sessionService.Create(ctx, &session.CreateRequest{
+		AppName: appName,
+		UserID:  userID,
+	})
+	if err != nil {
+		log.Fatalf("Failed to create the session service: %v", err)
+	}
+	sess := respSess.Session
+
+	r, err := runner.New(runner.Config{
+		AppName:        appName,
+		Agent:          llmagent,
+		SessionService: sessionService,
+	})
+	if err != nil {
+		log.Fatalf("Failed to create runner: %v", err)
+	}
+
+	for i, query := range queries {
+		fmt.Printf("\n=== Query %d: %s ===\n", i+1, query)
+		userMsg := genai.NewContentFromText(query, genai.RoleUser)
+		streamingMode := agent.StreamingModeSSE
+
+		runIter := r.Run(ctx, userID, sess.ID(), userMsg, agent.RunConfig{
+			StreamingMode: streamingMode,
+		})
+
+		fmt.Print("AI: ")
+		for event := range runIter {
+			if event != nil && event.LLMResponse.Content != nil {
+				for _, p := range event.LLMResponse.Content.Parts {
+						fmt.Print(p.Text)
+				}
+			}
+		}
+
+		fmt.Println("\n" + strings.Repeat("-", 80) + "\n")
+	}
+}

docs/en/samples/pre_post_processing/go/adk/go.mod

@@ -0,0 +1,44 @@
+module example.com/adk-agent
+
+go 1.24.4
+
+require (
+	github.com/googleapis/mcp-toolbox-sdk-go v0.5.1
+	google.golang.org/adk v0.3.0
+	google.golang.org/genai v1.43.0
+)
+
+require (
+	cloud.google.com/go v0.123.0 // indirect
+	cloud.google.com/go/auth v0.18.1 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
+	cloud.google.com/go/compute/metadata v0.9.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/google/s2a-go v0.1.9 // indirect
+	github.com/google/safehtml v0.1.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.11 // indirect
+	github.com/googleapis/gax-go/v2 v2.16.0 // indirect
+	github.com/gorilla/websocket v1.5.3 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.63.0 // indirect
+	go.opentelemetry.io/otel v1.39.0 // indirect
+	go.opentelemetry.io/otel/metric v1.39.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.39.0 // indirect
+	go.opentelemetry.io/otel/trace v1.39.0 // indirect
+	golang.org/x/crypto v0.47.0 // indirect
+	golang.org/x/net v0.49.0 // indirect
+	golang.org/x/oauth2 v0.34.0 // indirect
+	golang.org/x/sys v0.40.0 // indirect
+	golang.org/x/text v0.33.0 // indirect
+	google.golang.org/api v0.263.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260122232226-8e98ce8d340d // indirect
+	google.golang.org/grpc v1.78.0 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
+	rsc.io/omap v1.2.0 // indirect
+	rsc.io/ordered v1.1.1 // indirect
+)

docs/en/samples/pre_post_processing/go/adk/go.sum

@@ -0,0 +1,132 @@
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docs/en/samples/pre_post_processing/go/agent_test.go

@@ -0,0 +1,78 @@
+// 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 main
+
+import (
+	"bytes"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestQuickstartSample(t *testing.T) {
+	framework := os.Getenv("ORCH_NAME")
+	if framework == "" {
+		t.Skip("Skipping test: ORCH_NAME environment variable is not set.")
+	}
+
+	t.Logf("--- Testing: %s ---", framework)
+
+	if os.Getenv("GOOGLE_API_KEY") == "" {
+		t.Skipf("Skipping test for %s: GOOGLE_API_KEY environment variable is not set.", framework)
+	}
+
+	sampleDir := filepath.Join(".", framework)
+	if _, err := os.Stat(sampleDir); os.IsNotExist(err) {
+		t.Fatalf("Test setup failed: directory for framework '%s' not found.", framework)
+	}
+
+	cmd := exec.Command("go", "run", ".")
+	cmd.Dir = sampleDir
+	var stdout, stderr bytes.Buffer
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+
+	err := cmd.Run()
+	actualOutput := stdout.String()
+
+	if err != nil {
+		t.Fatalf("Script execution failed with error: %v\n--- STDERR ---\n%s", err, stderr.String())
+	}
+	if len(actualOutput) == 0 {
+		t.Fatal("Script ran successfully but produced no output.")
+	}
+
+	goldenKeywords := []string{
+		"AI:",
+		"Loyalty Points",
+		"POLICY CHECK: Intercepting 'update-hotel'",
+	}
+
+	var missingKeywords []string
+	outputLower := strings.ToLower(actualOutput)
+
+	for _, keyword := range goldenKeywords {
+		kw := strings.TrimSpace(keyword)
+		if kw != "" && !strings.Contains(outputLower, strings.ToLower(kw)) {
+			missingKeywords = append(missingKeywords, kw)
+		}
+	}
+
+	if len(missingKeywords) > 0 {
+		t.Fatalf("FAIL: The following keywords were missing from the output: [%s]", strings.Join(missingKeywords, ", "))
+	}
+}