fix: map LiteLLM thought parts to reasoning_content

- Treat Part(thought=True) as reasoning_content when building assistant messages.
- Add unit tests for thought-only and thought+text cases.

Close #4069

Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 853790274

.gemini/settings.json

@@ -0,0 +1,3 @@
+{
+  "contextFileName": "AGENTS.md"
+}

.github/ISSUE_TEMPLATE/bug_report.md

@@ -14,11 +14,12 @@ assignees: ''
 A clear and concise description of what the bug is.
 
 **To Reproduce**
+Please share a minimal code and data to reproduce your problem.
 Steps to reproduce the behavior:
 1. Install '...'
 2. Run '....'
 3. Open '....'
-4. See error
+4. Provide error or stacktrace
 
 **Expected behavior**
 A clear and concise description of what you expected to happen.
@@ -27,9 +28,13 @@ A clear and concise description of what you expected to happen.
 If applicable, add screenshots to help explain your problem.
 
 **Desktop (please complete the following information):**
- - OS: [e.g. iOS]
+ - OS: [e.g. macOS, Linux, Windows]
  - Python version(python -V):
  - ADK version(pip show google-adk):
 
+ **Model Information:**
+ - Are you using LiteLLM: Yes/No
+ - Which model is being used(e.g. gemini-2.5-pro)
+
 **Additional context**
 Add any other context about the problem here.

.github/pull_request_template.md

@@ -0,0 +1,52 @@
+**Please ensure you have read the [contribution guide](https://github.com/google/adk-python/blob/main/CONTRIBUTING.md) before creating a pull request.**
+
+### Link to Issue or Description of Change
+
+**1. Link to an existing issue (if applicable):**
+
+- Closes: #_issue_number_
+- Related: #_issue_number_
+
+**2. Or, if no issue exists, describe the change:**
+
+_If applicable, please follow the issue templates to provide as much detail as
+possible._
+
+**Problem:**
+_A clear and concise description of what the problem is._
+
+**Solution:**
+_A clear and concise description of what you want to happen and why you choose
+this solution._
+
+### Testing Plan
+
+_Please describe the tests that you ran to verify your changes. This is required
+for all PRs that are not small documentation or typo fixes._
+
+**Unit Tests:**
+
+- [ ] I have added or updated unit tests for my change.
+- [ ] All unit tests pass locally.
+
+_Please include a summary of passed `pytest` results._
+
+**Manual End-to-End (E2E) Tests:**
+
+_Please provide instructions on how to manually test your changes, including any
+necessary setup or configuration. Please provide logs or screenshots to help
+reviewers better understand the fix._
+
+### Checklist
+
+- [ ] I have read the [CONTRIBUTING.md](https://github.com/google/adk-python/blob/main/CONTRIBUTING.md) document.
+- [ ] I have performed a self-review of my own code.
+- [ ] I have commented my code, particularly in hard-to-understand areas.
+- [ ] I have added tests that prove my fix is effective or that my feature works.
+- [ ] New and existing unit tests pass locally with my changes.
+- [ ] I have manually tested my changes end-to-end.
+- [ ] Any dependent changes have been merged and published in downstream modules.
+
+### Additional context
+
+_Add any other context or screenshots about the feature request here._

.github/workflows/analyze-releases-for-adk-docs-updates.yml

@@ -0,0 +1,47 @@
+name: Analyze New Release for ADK Docs Updates
+
+on:
+  # Runs on every new release.
+  release:
+    types: [published]
+  # Manual trigger for testing and retrying.
+  workflow_dispatch:
+
+jobs:
+  analyze-new-release-for-adk-docs-updates:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.11'
+
+      - name: Load adk-bot SSH Private Key
+        uses: webfactory/ssh-agent@v0.9.0
+        with:
+          ssh-private-key: ${{ secrets.ADK_BOT_SSH_PRIVATE_KEY }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install requests google-adk
+
+      - name: Run Analyzing Script
+        env:
+          GITHUB_TOKEN: ${{ secrets.ADK_TRIAGE_AGENT }}
+          GOOGLE_API_KEY: ${{ secrets.GOOGLE_API_KEY }}
+          GOOGLE_GENAI_USE_VERTEXAI: 0
+          DOC_OWNER: 'google'
+          CODE_OWNER: 'google'
+          DOC_REPO: 'adk-docs'
+          CODE_REPO: 'adk-python'
+          INTERACTIVE: 0
+          PYTHONPATH: contributing/samples/adk_documentation
+        run: python -m adk_release_analyzer.main

.github/workflows/check-file-contents.yml

@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 2
 
@@ -70,7 +70,7 @@ jobs:
 
             # Use grep -L to find files that DO NOT contain the pattern.
             # This command will output a list of non-compliant files.
-            FILES_MISSING_IMPORT=$(grep -L 'from __future__ import annotations' $CHANGED_FILES)
+            FILES_MISSING_IMPORT=$(grep -L 'from __future__ import annotations' $CHANGED_FILES || true)
 
             # Check if the list of non-compliant files is empty
             if [ -z "$FILES_MISSING_IMPORT" ]; then
@@ -89,7 +89,7 @@ jobs:
       - name: Check for import from cli package in certain changed Python files
         run: |
           git fetch origin ${{ github.base_ref }}
-          CHANGED_FILES=$(git diff --diff-filter=ACMR --name-only origin/${{ github.base_ref }}...HEAD | grep -E '\.py$' | grep -v -E 'cli/.*|tests/.*|contributing/samples/' || true)
+          CHANGED_FILES=$(git diff --diff-filter=ACMR --name-only origin/${{ github.base_ref }}...HEAD | grep -E '\.py$' | grep -v -E 'cli/.*|src/google/adk/tools/apihub_tool/apihub_toolset.py|tests/.*|contributing/samples/' || true)
           if [ -n "$CHANGED_FILES" ]; then
             echo "Changed Python files to check:"
             echo "$CHANGED_FILES"

.github/workflows/copybara-pr-handler.yml

@@ -0,0 +1,134 @@
+name: Copybara PR Handler
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+    inputs:
+      pr_number:
+        description: 'PR number to close (for testing)'
+        required: true
+        type: string
+      commit_sha:
+        description: 'Commit SHA reference (optional, for testing)'
+        required: false
+        type: string
+
+jobs:
+  close-imported-pr:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      issues: write
+      contents: read
+
+    steps:
+      - name: Check for Copybara commits and close PRs
+        uses: actions/github-script@v8
+        with:
+          github-token: ${{ secrets.ADK_TRIAGE_AGENT }}
+          script: |
+            // Check if this is a manual test run
+            const isManualRun = context.eventName === 'workflow_dispatch';
+
+            let prsToClose = [];
+
+            if (isManualRun) {
+              // Manual testing mode
+              const prNumber = parseInt(context.payload.inputs.pr_number);
+              const commitSha = context.payload.inputs.commit_sha || context.sha.substring(0, 7);
+
+              console.log('=== MANUAL TEST MODE ===');
+              console.log(`Testing with PR #${prNumber}, commit ${commitSha}`);
+
+              prsToClose.push({ prNumber, commitSha });
+            } else {
+              // Normal mode: process commits from push event
+              const commits = context.payload.commits || [];
+              console.log(`Found ${commits.length} commit(s) in this push`);
+
+              // Process each commit
+              for (const commit of commits) {
+                const sha = commit.id;
+                const committer = commit.committer.name;
+                const message = commit.message;
+
+                console.log(`\n--- Processing commit ${sha.substring(0, 7)} ---`);
+                console.log(`Committer: ${committer}`);
+
+                // Check if this is a Copybara commit
+                if (committer !== 'Copybara-Service') {
+                  console.log('Not a Copybara commit, skipping');
+                  continue;
+                }
+
+                // Extract PR number from commit message
+                // Pattern: "Merge https://github.com/google/adk-python/pull/3333"
+                const prMatch = message.match(/Merge https:\/\/github\.com\/google\/adk-python\/pull\/(\d+)/);
+
+                if (!prMatch) {
+                  console.log('No PR number found in Copybara commit message');
+                  continue;
+                }
+
+                const prNumber = parseInt(prMatch[1]);
+                const commitSha = sha.substring(0, 7);
+
+                prsToClose.push({ prNumber, commitSha });
+              }
+            }
+
+            // Process PRs to close
+            for (const { prNumber, commitSha } of prsToClose) {
+              console.log(`\n--- Processing PR #${prNumber} ---`);
+
+              // Get PR details to check if it's open
+              let pr;
+              try {
+                pr = await github.rest.pulls.get({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  pull_number: prNumber
+                });
+              } catch (error) {
+                console.log(`PR #${prNumber} not found or inaccessible:`, error.message);
+                continue;
+              }
+
+              // Only close if PR is still open
+              if (pr.data.state !== 'open') {
+                console.log(`PR #${prNumber} is already ${pr.data.state}, skipping`);
+                continue;
+              }
+
+              const author = pr.data.user.login;
+
+              try {
+                // Add comment with commit reference
+                await github.rest.issues.createComment({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: prNumber,
+                  body: `Thank you @${author} for your contribution! 🎉\n\nYour changes have been successfully imported and merged via Copybara in commit ${commitSha}.\n\nClosing this PR as the changes are now in the main branch.`
+                });
+
+                // Close the PR
+                await github.rest.pulls.update({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  pull_number: prNumber,
+                  state: 'closed'
+                });
+
+                console.log(`Successfully closed PR #${prNumber}`);
+              } catch (error) {
+                console.log(`Error closing PR #${prNumber}:`, error.message);
+              }
+            }
+
+            if (isManualRun) {
+              console.log('\n=== TEST COMPLETED ===');
+            } else {
+              console.log('\n--- Finished processing all commits ---');
+            }

.github/workflows/discussion_answering.yml

@@ -0,0 +1,54 @@
+name: ADK Answering Agent for Discussions
+
+on:
+  discussion:
+    types: [created]
+  discussion_comment:
+    types: [created]
+
+jobs:
+  agent-answer-questions:
+    if: >-
+      (github.event_name == 'discussion' && github.event.discussion.category.name == 'Q&A') ||
+      (github.event_name == 'discussion_comment' && contains(github.event.comment.body, '@adk-bot') && github.event.sender.login != 'adk-bot')
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.11'
+
+      - name: Authenticate to Google Cloud
+        id: auth
+        uses: 'google-github-actions/auth@v3'
+        with:
+          credentials_json: '${{ secrets.ADK_GCP_SA_KEY }}'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install google-adk google-cloud-discoveryengine
+
+      - name: Run Answering Script
+        env:
+          GITHUB_TOKEN: ${{ secrets.ADK_TRIAGE_AGENT }}
+          ADK_GCP_SA_KEY: ${{ secrets.ADK_GCP_SA_KEY }}
+          GOOGLE_CLOUD_PROJECT: ${{ secrets.GOOGLE_CLOUD_PROJECT }}
+          GOOGLE_CLOUD_LOCATION: ${{ secrets.GOOGLE_CLOUD_LOCATION }}
+          VERTEXAI_DATASTORE_ID: ${{ secrets.VERTEXAI_DATASTORE_ID }}
+          GEMINI_API_DATASTORE_ID: ${{ secrets.GEMINI_API_DATASTORE_ID }}
+          GOOGLE_GENAI_USE_VERTEXAI: 1
+          OWNER: 'google'
+          REPO: 'adk-python'
+          INTERACTIVE: 0
+          PYTHONPATH: contributing/samples
+        run: |
+          # Write discussion data to temporary file to avoid secret masking issues
+          cat > /tmp/discussion.json << 'EOF'
+          ${{ toJson(github.event.discussion) }}
+          EOF
+          python -m adk_answering_agent.main --discussion-file /tmp/discussion.json

.github/workflows/isort.yml

@@ -26,12 +26,12 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 2
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.x'
 

.github/workflows/pr-triage.yml

@@ -0,0 +1,45 @@
+name: ADK Pull Request Triaging Agent
+
+on:
+  pull_request_target:
+    types: [opened, reopened, edited]
+  workflow_dispatch:
+    inputs:
+      pr_number:
+        description: 'The Pull Request number to triage'
+        required: true
+        type: 'string'
+
+jobs:
+  agent-triage-pull-request:
+    if: github.event_name == 'workflow_dispatch' || !contains(github.event.pull_request.labels.*.name, 'google-contributor')
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.11'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install requests google-adk
+
+      - name: Run Triaging Script
+        env:
+          GITHUB_TOKEN: ${{ secrets.ADK_TRIAGE_AGENT }}
+          GOOGLE_API_KEY: ${{ secrets.GOOGLE_API_KEY }}
+          GOOGLE_GENAI_USE_VERTEXAI: 0
+          OWNER: 'google'
+          REPO: 'adk-python'
+          PULL_REQUEST_NUMBER: ${{ github.event.pull_request.number || github.event.inputs.pr_number }}
+          INTERACTIVE: ${{ vars.PR_TRIAGE_INTERACTIVE }}
+          PYTHONPATH: contributing/samples
+        run: python -m adk_pr_triaging_agent.main

.github/workflows/pyink.yml

@@ -26,12 +26,12 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 2
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.x'
 

.github/workflows/python-unit-tests.yml

@@ -25,19 +25,19 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
 
-    - name: Install uv
-      run: curl -LsSf https://astral.sh/uv/install.sh | sh
+    - name: Install the latest version of uv
+      uses: astral-sh/setup-uv@v6
 
     - name: Install dependencies
       run: |
@@ -48,14 +48,6 @@ jobs:
     - name: Run unit tests with pytest
       run: |
         source .venv/bin/activate
-        if [[ "${{ matrix.python-version }}" == "3.9" ]]; then
-          pytest tests/unittests \
-            --ignore=tests/unittests/a2a \
-            --ignore=tests/unittests/tools/mcp_tool \
-            --ignore=tests/unittests/artifacts/test_artifact_service.py \
-            --ignore=tests/unittests/tools/google_api_tool/test_googleapi_to_openapi_converter.py
-        else
-          pytest tests/unittests \
-            --ignore=tests/unittests/artifacts/test_artifact_service.py \
-            --ignore=tests/unittests/tools/google_api_tool/test_googleapi_to_openapi_converter.py
-        fi
+        pytest tests/unittests \
+          --ignore=tests/unittests/artifacts/test_artifact_service.py \
+          --ignore=tests/unittests/tools/google_api_tool/test_googleapi_to_openapi_converter.py

.github/workflows/stale-bot.yml

@@ -0,0 +1,57 @@
+# 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.
+
+name: ADK Stale Issue Auditor
+
+on:
+  workflow_dispatch:
+
+  schedule:
+    # This runs at 6:00 AM UTC (10 PM PST)
+    - cron: '0 6 * * *'
+
+jobs:
+  audit-stale-issues:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+
+    permissions:
+      issues: write
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.11'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install requests google-adk
+
+      - name: Run Auditor Agent Script
+        env:
+          GITHUB_TOKEN: ${{ secrets.ADK_TRIAGE_AGENT }}
+          GOOGLE_API_KEY: ${{ secrets.GOOGLE_API_KEY }}
+          OWNER: ${{ github.repository_owner }}
+          REPO: adk-python
+          CONCURRENCY_LIMIT: 3
+          LLM_MODEL_NAME: "gemini-2.5-flash"
+          PYTHONPATH: contributing/samples
+
+        run: python -m adk_stale_agent.main

.github/workflows/triage.yml

@@ -2,23 +2,32 @@ name: ADK Issue Triaging Agent
 
 on:
   issues:
-    types: [opened, reopened]
+    types: [opened, labeled]
   schedule:
-    - cron: '0 */6 * * *' # every 6h
+    # Run every 6 hours to triage untriaged issues
+    - cron: '0 */6 * * *'
 
 jobs:
   agent-triage-issues:
     runs-on: ubuntu-latest
+    # Run for:
+    # - Scheduled runs (batch processing)
+    # - New issues (need component labeling)
+    # - Issues labeled with "planned" (need owner assignment)
+    if: >-
+      github.event_name == 'schedule' ||
+      github.event.action == 'opened' ||
+      github.event.label.name == 'planned'
     permissions:
       issues: write
       contents: read
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.11'
 
@@ -32,12 +41,13 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.ADK_TRIAGE_AGENT }}
           GOOGLE_API_KEY: ${{ secrets.GOOGLE_API_KEY }}
           GOOGLE_GENAI_USE_VERTEXAI: 0
-          OWNER: 'google'
-          REPO: 'adk-python'
+          OWNER: ${{ github.repository_owner }}
+          REPO: ${{ github.event.repository.name }}
           INTERACTIVE: 0
           EVENT_NAME: ${{ github.event_name }} # 'issues', 'schedule', etc.
           ISSUE_NUMBER: ${{ github.event.issue.number }}
           ISSUE_TITLE: ${{ github.event.issue.title }}
           ISSUE_BODY: ${{ github.event.issue.body }}
           ISSUE_COUNT_TO_PROCESS: '3' # Process 3 issues at a time on schedule
-        run: python contributing/samples/adk_triaging_agent/main.py
+          PYTHONPATH: contributing/samples
+        run: python -m adk_triaging_agent.main

.github/workflows/upload-adk-docs-to-vertex-ai-search.yml

@@ -0,0 +1,51 @@
+name: Upload ADK Docs to Vertex AI Search
+
+on:
+  # Runs once per day at 16:00 UTC
+  schedule:
+   - cron: '00 16 * * *'
+  # Manual trigger for testing and fixing
+  workflow_dispatch:
+
+jobs:
+  upload-adk-docs-to-vertex-ai-search:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Clone adk-docs repository
+        run: git clone https://github.com/google/adk-docs.git /tmp/adk-docs
+
+      - name: Clone adk-python repository
+        run: git clone https://github.com/google/adk-python.git /tmp/adk-python
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.11'
+
+      - name: Authenticate to Google Cloud
+        id: auth
+        uses: 'google-github-actions/auth@v3'
+        with:
+          credentials_json: '${{ secrets.ADK_GCP_SA_KEY }}'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install google-adk markdown google-cloud-storage google-cloud-discoveryengine
+
+      - name: Run Answering Script
+        env:
+          GITHUB_TOKEN: ${{ secrets.ADK_TRIAGE_AGENT }}
+          GOOGLE_CLOUD_PROJECT: ${{ secrets.GOOGLE_CLOUD_PROJECT }}
+          GOOGLE_CLOUD_LOCATION: ${{ secrets.GOOGLE_CLOUD_LOCATION }}
+          VERTEXAI_DATASTORE_ID: ${{ secrets.VERTEXAI_DATASTORE_ID }}
+          GOOGLE_GENAI_USE_VERTEXAI: 1
+          GCS_BUCKET_NAME: ${{ secrets.GCS_BUCKET_NAME }}
+          ADK_DOCS_ROOT_PATH: /tmp/adk-docs
+          ADK_PYTHON_ROOT_PATH: /tmp/adk-python
+          PYTHONPATH: contributing/samples
+        run: python -m adk_answering_agent.upload_docs_to_vertex_ai_search

.gitignore

@@ -82,6 +82,7 @@ log/
 .env.development.local
 .env.test.local
 .env.production.local
+uv.lock
 
 # Google Cloud specific
 .gcloudignore
@@ -97,3 +98,21 @@ Thumbs.db
 *.bak
 *.tmp
 *.temp
+
+# AI Coding Tools - Project-specific configs
+# Developers should symlink or copy AGENTS.md and add their own overrides locally
+.adk/
+.claude/
+CLAUDE.md
+.cursor/
+.cursorrules
+.cursorignore
+.windsurfrules
+.aider*
+.continue/
+.codeium/
+.githubnext/
+.roo/
+.rooignore
+.bolt/
+.v0/

CONTRIBUTING.md

@@ -2,25 +2,24 @@
 
 We'd love to accept your patches and contributions to this project.
 
-- [How to contribute](#how-to-contribute)
-- [Before you begin](#before-you-begin)
-  - [Sign our Contributor License Agreement](#sign-our-contributor-license-agreement)
-  - [Review our community guidelines](#review-our-community-guidelines)
-- [Contribution workflow](#contribution-workflow)
-  - [Finding Issues to Work On](#finding-issues-to-work-on)
-  - [Requirement for PRs](#requirement-for-prs)
-  - [Large or Complex Changes](#large-or-complex-changes)
-  - [Testing Requirements](#testing-requirements)
-    - [Unit Tests](#unit-tests)
-    - [Manual End-to-End (E2E) Tests](#manual-end-to-end-e2e-tests)
-  - [Documentation](#documentation)
-  - [Development Setup](#development-setup)
-  - [Code reviews](#code-reviews)
+-   [How to contribute](#how-to-contribute)
+-   [Before you begin](#before-you-begin)
+    -   [Sign our Contributor License Agreement](#sign-our-contributor-license-agreement)
+    -   [Review our community guidelines](#review-our-community-guidelines)
+-   [Contribution workflow](#contribution-workflow)
+    -   [Finding Issues to Work On](#finding-issues-to-work-on)
+    -   [Requirement for PRs](#requirement-for-prs)
+    -   [Large or Complex Changes](#large-or-complex-changes)
+    -   [Testing Requirements](#testing-requirements)
+    -   [Unit Tests](#unit-tests)
+    -   [Manual End-to-End (E2E) Tests](#manual-end-to-end-e2e-tests)
+    -   [Documentation](#documentation)
+    -   [Development Setup](#development-setup)
+    -   [Code reviews](#code-reviews)
 
+## Before you begin
 
-# Before you begin
-
-## Sign our Contributor License Agreement
+### Sign our Contributor License Agreement
 
 Contributions to this project must be accompanied by a
 [Contributor License Agreement](https://cla.developers.google.com/about) (CLA).
@@ -34,73 +33,104 @@ was for a different project), you probably don't need to do it again.
 Visit <https://cla.developers.google.com/> to see your current agreements or to
 sign a new one.
 
-## Review our community guidelines
+### Review our community guidelines
 
 This project follows
 [Google's Open Source Community Guidelines](https://opensource.google/conduct/).
 
-# Contribution workflow
+### Code reviews
 
-## Finding Issues to Work On
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.
 
-- Browse issues labeled **`good first issue`** (newcomer-friendly) or **`help wanted`** (general contributions).
-- For other issues, please kindly ask before contributing to avoid duplication.
+## Contribution workflow
 
+### Finding Issues to Work On
 
-## Requirement for PRs
+-   Browse issues labeled **`good first issue`** (newcomer-friendly) or **`help
+    wanted`** (general contributions).
+-   For other issues, please kindly ask before contributing to avoid
+    duplication.
 
-- All PRs, other than small documentation or typo fixes, should have a Issue assoicated. If not, please create one.
-- Small, focused PRs. Keep changes minimal—one concern per PR.
-- For bug fixes or features, please provide logs or screenshot after the fix is applied to help reviewers better understand the fix.
-- Please include a `testing plan` section in your PR to talk about how you will test. This will save time for PR review. See `Testing Requirements` section for more details.
+### Requirement for PRs
+
+-   All PRs, other than small documentation or typo fixes, should have an Issue
+    associated. If a relevant issue doesn't exist, please create one first or
+    you may instead describe the bug or feature directly within the PR
+    description, following the structure of our issue templates.
+-   Small, focused PRs. Keep changes minimal—one concern per PR.
+-   For bug fixes or features, please provide logs or screenshot after the fix
+    is applied to help reviewers better understand the fix.
+-   Please include a `testing plan` section in your PR to describe how you
+    will test. This will save time for PR review. See `Testing Requirements`
+    section for more details.
+
+### Large or Complex Changes
 
-## Large or Complex Changes
 For substantial features or architectural revisions:
 
-- Open an Issue First: Outline your proposal, including design considerations and impact.
-- Gather Feedback: Discuss with maintainers and the community to ensure alignment and avoid duplicate work
+-   Open an Issue First: Outline your proposal, including design considerations
+    and impact.
+-   Gather Feedback: Discuss with maintainers and the community to ensure
+    alignment and avoid duplicate work
 
-## Testing Requirements
+### Testing Requirements
 
-To maintain code quality and prevent regressions, all code changes must include comprehensive tests and verifiable end-to-end (E2E) evidence.
+To maintain code quality and prevent regressions, all code changes must include
+comprehensive tests and verifiable end-to-end (E2E) evidence.
 
+#### Unit Tests
 
-### Unit Tests
-
-Please add or update unit tests for your change. Please include a summary of passed `pytest` results.
+Please add or update unit tests for your change. Please include a summary of
+passed `pytest` results.
 
 Requirements for unit tests:
 
-- **Coverage:** Cover new features, edge cases, error conditions, and typical use cases.
-- **Location:** Add or update tests under `tests/unittests/`, following existing naming conventions (e.g., `test_<module>_<feature>.py`).
-- **Framework:** Use `pytest`. Tests should be:
-  - Fast and isolated.
-  - Written clearly with descriptive names.
-  - Free of external dependencies (use mocks or fixtures as needed).
-- **Quality:** Aim for high readability and maintainability; include docstrings or comments for complex scenarios.
+-   **Coverage:** Cover new features, edge cases, error conditions, and typical
+    use cases.
+-   **Location:** Add or update tests under `tests/unittests/`, following
+    existing naming conventions (e.g., `test_<module>_<feature>.py`).
+-   **Framework:** Use `pytest`. Tests should be:
+    -   Fast and isolated.
+    -   Written clearly with descriptive names.
+    -   Free of external dependencies (use mocks or fixtures as needed).
+-   **Quality:** Aim for high readability and maintainability; include
+    docstrings or comments for complex scenarios.
 
-### Manual End-to-End (E2E) Tests
+#### Manual End-to-End (E2E) Tests
 
-Manual E2E tests ensure integrated flows work as intended. Your tests should cover all scenarios. Sometimes, it's also good to ensure relevant functionality is not impacted.
+Manual E2E tests ensure integrated flows work as intended. Your tests should
+cover all scenarios. Sometimes, it's also good to ensure relevant functionality
+is not impacted.
 
 Depending on your change:
 
-- **ADK Web:**
-  - Use the `adk web` to verify functionality.
-  - Capture and attach relevant screenshots demonstrating the UI/UX changes or outputs.
-  - Label screenshots clearly in your PR description.
+-   **ADK Web:**
 
-- **Runner:**
-  - Provide the testing setup. For example, the agent definition, and the runner setup.
-  - Execute the `runner` tool to reproduce workflows.
-  - Include the command used and console output showing test results.
-  - Highlight sections of the log that directly relate to your change.
+    -   Use the `adk web` to verify functionality.
+    -   Capture and attach relevant screenshots demonstrating the UI/UX changes
+        or outputs.
+    -   Label screenshots clearly in your PR description.
 
-## Documentation
+-   **Runner:**
 
-For any changes that impact user-facing documentation (guides, API reference, tutorials), please open a PR in the [adk-docs](https://github.com/google/adk-docs) repository to update relevant part before or alongside your code PR.
+    -   Provide the testing setup. For example, the agent definition, and the
+        runner setup.
+    -   Execute the `runner` tool to reproduce workflows.
+    -   Include the command used and console output showing test results.
+    -   Highlight sections of the log that directly relate to your change.
+
+### Documentation
+
+For any changes that impact user-facing documentation (guides, API reference,
+tutorials), please open a PR in the
+[adk-docs](https://github.com/google/adk-docs) repository to update the relevant
+part before or alongside your code PR.
 
 ## Development Setup
+
 1.  **Clone the repository:**
 
     ```shell
@@ -110,11 +140,13 @@ For any changes that impact user-facing documentation (guides, API reference, tu
 
 2.  **Install uv:**
 
-    Check out [uv installation guide](https://docs.astral.sh/uv/getting-started/installation/).
+    Check out
+    [uv installation guide](https://docs.astral.sh/uv/getting-started/installation/).
 
 3.  **Create and activate a virtual environment:**
 
-    **NOTE**: ADK supports Python 3.9+. Python 3.11 and above is strongly recommended.
+    **NOTE**: ADK supports Python 3.10+. Python 3.11 and above is strongly
+    recommended.
 
     Create a workspace venv using uv.
 
@@ -128,7 +160,8 @@ For any changes that impact user-facing documentation (guides, API reference, tu
     source .venv/bin/activate
     ```
 
-    **windows**
+    **Windows**
+
     ```shell
     source .\.venv\Scripts\activate
     ```
@@ -147,11 +180,11 @@ For any changes that impact user-facing documentation (guides, API reference, tu
     pytest ./tests/unittests
     ```
 
-    NOTE: for accurately repro test failure, only include `test` and `eval` as
-    extra dependencies.
+    NOTE: for accurate repro of test failure, only include `test`, `eval` and
+    `a2a` as extra dependencies.
 
     ```shell
-    uv sync --extra test --extra eval
+    uv sync --extra test --extra eval --extra a2a
     pytest ./tests/unittests
     ```
 
@@ -164,14 +197,14 @@ For any changes that impact user-facing documentation (guides, API reference, tu
     ./autoformat.sh
     ```
 
-7. **Build the wheel file:**
+7.  **Build the wheel file:**
 
     ```shell
     uv build
     ```
 
-8.  **Test the locally built wheel file:**
-    Have a simple testing folder setup as mentioned in the
+8.  **Test the locally built wheel file:** Have a simple testing folder setup as
+    mentioned in the
     [quickstart](https://google.github.io/adk-docs/get-started/quickstart/).
 
     Then following below steps to test your changes:
@@ -200,12 +233,11 @@ For any changes that impact user-facing documentation (guides, API reference, tu
 
 ## Contributing Resources
 
-[Contributing folder](https://github.com/google/adk-python/tree/main/contributing/samples) has resources that is helpful for contributors.
+[Contributing folder](https://github.com/google/adk-python/tree/main/contributing)
+has resources that are helpful for contributors.
 
+## Vibe Coding
 
-## Code reviews
-
-All submissions, including submissions by project members, require review. We
-use GitHub pull requests for this purpose. Consult
-[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
-information on using pull requests.
+If you want to contribute by leveraging vibe coding, the AGENTS.md
+(https://github.com/google/adk-python/tree/main/AGENTS.md) could be used as
+context to your LLM.

README.md

@@ -1,53 +1,64 @@
 # Agent Development Kit (ADK)
 
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](LICENSE)
+[![PyPI](https://img.shields.io/pypi/v/google-adk)](https://pypi.org/project/google-adk/)
 [![Python Unit Tests](https://github.com/google/adk-python/actions/workflows/python-unit-tests.yml/badge.svg)](https://github.com/google/adk-python/actions/workflows/python-unit-tests.yml)
 [![r/agentdevelopmentkit](https://img.shields.io/badge/Reddit-r%2Fagentdevelopmentkit-FF4500?style=flat&logo=reddit&logoColor=white)](https://www.reddit.com/r/agentdevelopmentkit/)
-[![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/google/adk-python)
+<a href="https://codewiki.google/github.com/google/adk-python"><img src="https://www.gstatic.com/_/boq-sdlc-agents-ui/_/r/Mvosg4klCA4.svg" alt="Ask Code Wiki" height="20"></a>
 
 <html>
     <h2 align="center">
       <img src="https://raw.githubusercontent.com/google/adk-python/main/assets/agent-development-kit.png" width="256"/>
     </h2>
     <h3 align="center">
-      An open-source, code-first Python toolkit for building, evaluating, and deploying sophisticated AI agents with flexibility and control.
+      An open-source, code-first Python framework for building, evaluating, and deploying sophisticated AI agents with flexibility and control.
     </h3>
     <h3 align="center">
       Important Links:
-      <a href="https://google.github.io/adk-docs/">Docs</a>, 
+      <a href="https://google.github.io/adk-docs/">Docs</a>,
       <a href="https://github.com/google/adk-samples">Samples</a>,
-      <a href="https://github.com/google/adk-java">Java ADK</a> &
+      <a href="https://github.com/google/adk-java">Java ADK</a>,
+      <a href="https://github.com/google/adk-go">Go ADK</a> &
       <a href="https://github.com/google/adk-web">ADK Web</a>.
     </h3>
 </html>
 
-Agent Development Kit (ADK) is a flexible and modular framework for developing and deploying AI agents. While optimized for Gemini and the Google ecosystem, ADK is model-agnostic, deployment-agnostic, and is built for compatibility with other frameworks. ADK was designed to make agent development feel more like software development, to make it easier for developers to create, deploy, and orchestrate agentic architectures that range from simple tasks to complex workflows.
-
+Agent Development Kit (ADK) is a flexible and modular framework that applies
+software development principles to AI agent creation. It is designed to
+simplify building, deploying, and orchestrating agent workflows, from simple
+tasks to complex systems. While optimized for Gemini, ADK is model-agnostic,
+deployment-agnostic, and compatible with other frameworks.
 
 ---
 
+## 🔥 What's new
+
+- **Custom Service Registration**: Add a service registry to provide a generic way to register custom service implementations to be used in FastAPI server. See [short instruction](https://github.com/google/adk-python/discussions/3175#discussioncomment-14745120). ([391628f](https://github.com/google/adk-python/commit/391628fcdc7b950c6835f64ae3ccab197163c990))
+
+- **Rewind**: Add the ability to rewind a session to before a previous invocation ([9dce06f](https://github.com/google/adk-python/commit/9dce06f9b00259ec42241df4f6638955e783a9d1)).
+
+- **New CodeExecutor**: Introduces a new AgentEngineSandboxCodeExecutor class that supports executing agent-generated code using the Vertex AI Code Execution Sandbox API ([ee39a89](https://github.com/google/adk-python/commit/ee39a891106316b790621795b5cc529e89815a98))
+
 ## ✨ Key Features
 
 - **Rich Tool Ecosystem**: Utilize pre-built tools, custom functions,
-  OpenAPI specs, or integrate existing tools to give agents diverse
+  OpenAPI specs, MCP tools or integrate existing tools to give agents diverse
   capabilities, all for tight integration with the Google ecosystem.
 
 - **Code-First Development**: Define agent logic, tools, and orchestration
   directly in Python for ultimate flexibility, testability, and versioning.
 
+- **Agent Config**: Build agents without code. Check out the
+  [Agent Config](https://google.github.io/adk-docs/agents/config/) feature.
+
+- **Tool Confirmation**: A [tool confirmation flow(HITL)](https://google.github.io/adk-docs/tools/confirmation/) that can guard tool execution with explicit confirmation and custom input.
+
 - **Modular Multi-Agent Systems**: Design scalable applications by composing
   multiple specialized agents into flexible hierarchies.
 
 - **Deploy Anywhere**: Easily containerize and deploy agents on Cloud Run or
   scale seamlessly with Vertex AI Agent Engine.
 
-## 🤖 Agent2Agent (A2A) Protocol and ADK Integration
-
-For remote agent-to-agent communication, ADK integrates with the
-[A2A protocol](https://github.com/google-a2a/A2A/).
-See this [example](https://github.com/google-a2a/a2a-samples/tree/main/samples/python/agents/google_adk)
-for how they can work together.
-
 ## 🚀 Installation
 
 ### Stable Release (Recommended)
@@ -58,7 +69,7 @@ You can install the latest stable version of ADK using `pip`:
 pip install google-adk
 ```
 
-The release cadence is weekly.
+The release cadence is roughly bi-weekly.
 
 This version is recommended for most users as it represents the most recent official release.
 
@@ -71,6 +82,13 @@ pip install git+https://github.com/google/adk-python.git@main
 
 Note: The development version is built directly from the latest code commits. While it includes the newest fixes and features, it may also contain experimental changes or bugs not present in the stable release. Use it primarily for testing upcoming changes or accessing critical fixes before they are officially released.
 
+## 🤖 Agent2Agent (A2A) Protocol and ADK Integration
+
+For remote agent-to-agent communication, ADK integrates with the
+[A2A protocol](https://github.com/google-a2a/A2A/).
+See this [example](https://github.com/a2aproject/a2a-samples/tree/main/samples/python/agents)
+for how they can work together.
+
 ## 📚 Documentation
 
 Explore the full documentation for detailed guides on building, evaluating, and
@@ -88,7 +106,7 @@ from google.adk.tools import google_search
 
 root_agent = Agent(
     name="search_assistant",
-    model="gemini-2.0-flash", # Or your preferred Gemini model
+    model="gemini-2.5-flash", # Or your preferred Gemini model
     instruction="You are a helpful assistant. Answer user questions using Google Search when needed.",
     description="An assistant that can search the web.",
     tools=[google_search]
@@ -103,13 +121,13 @@ Define a multi-agent system with coordinator agent, greeter agent, and task exec
 from google.adk.agents import LlmAgent, BaseAgent
 
 # Define individual agents
-greeter = LlmAgent(name="greeter", model="gemini-2.0-flash", ...)
-task_executor = LlmAgent(name="task_executor", model="gemini-2.0-flash", ...)
+greeter = LlmAgent(name="greeter", model="gemini-2.5-flash", ...)
+task_executor = LlmAgent(name="task_executor", model="gemini-2.5-flash", ...)
 
 # Create parent agent and assign children via sub_agents
 coordinator = LlmAgent(
     name="Coordinator",
-    model="gemini-2.0-flash",
+    model="gemini-2.5-flash",
     description="I coordinate greetings and tasks.",
     sub_agents=[ # Assign sub_agents here
         greeter,
@@ -135,9 +153,23 @@ adk eval \
 ## 🤝 Contributing
 
 We welcome contributions from the community! Whether it's bug reports, feature requests, documentation improvements, or code contributions, please see our
-- [General contribution guideline and flow](https://google.github.io/adk-docs/contributing-guide/#questions).
+- [General contribution guideline and flow](https://google.github.io/adk-docs/contributing-guide/).
 - Then if you want to contribute code, please read [Code Contributing Guidelines](./CONTRIBUTING.md) to get started.
 
+## Community Repo
+
+We have [adk-python-community repo](https://github.com/google/adk-python-community) that is home to a growing ecosystem of community-contributed tools, third-party
+service integrations, and deployment scripts that extend the core capabilities
+of the ADK.
+
+## Vibe Coding
+
+If you want to develop agent via vibe coding the [llms.txt](./llms.txt) and the [llms-full.txt](./llms-full.txt) can be used as context to LLM. While the former one is a summarized one and the later one has the full information in case your LLM has big enough context window.
+
+## Community Events
+
+- [Completed] ADK's 1st community meeting on Wednesday, October 15, 2025. Remember to [join our group](https://groups.google.com/g/adk-community) to get access to the [recording](https://drive.google.com/file/d/1rpXDq5NSH8-MyMeYI6_5pZ3Lhn0X9BQf/view), and [deck](https://docs.google.com/presentation/d/1_b8LG4xaiadbUUDzyNiapSFyxanc9ZgFdw7JQ6zmZ9Q/edit?slide=id.g384e60cdaca_0_658&resourcekey=0-tjFFv0VBQhpXBPCkZr0NOg#slide=id.g384e60cdaca_0_658).
+
 ## 📄 License
 
 This project is licensed under the Apache 2.0 License - see the [LICENSE](LICENSE) file for details.

autoformat.sh

@@ -52,16 +52,16 @@ echo '---------------------------------------'
 echo '|  Auto-formatting src/...'
 echo '---------------------------------------'
 
-find -L src/ -type f -name "*.py" -exec pyink --config pyproject.toml {} +
+find -L src/ -not -path "*/.*" -type f -name "*.py" -exec pyink --config pyproject.toml {} +
 
 echo '---------------------------------------'
 echo '|  Auto-formatting tests/...'
 echo '---------------------------------------'
 
-find -L tests/ -type f -name "*.py" -exec pyink --config pyproject.toml {} +
+find -L tests/ -not -path "*/.*" -type f -name "*.py" -exec pyink --config pyproject.toml {} +
 
 echo '---------------------------------------'
 echo '|  Auto-formatting contributing/...'
 echo '---------------------------------------'
 
-find -L contributing/ -type f -name "*.py" -exec pyink --config pyproject.toml {} +
+find -L contributing/ -not -path "*/.*" -type f -name "*.py" -exec pyink --config pyproject.toml {} +