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feat: Add GitHub Actions Codebase Agent workflow
Add comprehensive GitHub Actions deployment for Codebase Agent: - New workflow: .github/workflows/codebase-agent.yml - Triggers on @cba mentions in comments - Triggers on cba-review and cba-help labels - GCP Workload Identity authentication (no keys!) - Vertex AI integration ready - Updated docs: docs/patterns/codebase-agent.md - Added GitHub Actions Deployment section - GCP Workload Identity setup guide - Complete workflow template with Python script - Vertex AI migration guide - Security best practices - Cost estimates and troubleshooting The workflow enables team-wide AI-assisted code reviews through simple @cba mentions or labels, with secure GCP authentication via Workload Identity Federation. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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‎.github/workflows/codebase-agent.yml‎

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name: Codebase Agent
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on:
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issue_comment:
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types: [created]
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pull_request_review_comment:
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types: [created]
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issues:
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types: [opened, labeled]
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pull_request:
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types: [opened, labeled, ready_for_review]
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permissions:
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contents: write
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pull-requests: write
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issues: write
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id-token: write # Required for GCP Workload Identity
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jobs:
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codebase-agent:
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runs-on: ubuntu-latest
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# Only run if:
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# 1. Comment contains @cba mention, OR
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# 2. Issue/PR has 'cba-review' label, OR
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# 3. Issue/PR has 'cba-help' label
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if: |
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(github.event_name == 'issue_comment' && contains(github.event.comment.body, '@cba')) ||
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(github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@cba')) ||
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contains(github.event.issue.labels.*.name, 'cba-review') ||
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contains(github.event.pull_request.labels.*.name, 'cba-review') ||
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contains(github.event.issue.labels.*.name, 'cba-help') ||
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contains(github.event.pull_request.labels.*.name, 'cba-help')
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steps:
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- name: Checkout repository
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uses: actions/checkout@v4
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with:
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fetch-depth: 0 # Full history for better context
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- name: Authenticate to Google Cloud
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id: auth
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uses: google-github-actions/auth@v2
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with:
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workload_identity_provider: ${{ secrets.GCP_WORKLOAD_IDENTITY_PROVIDER }}
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service_account: ${{ secrets.GCP_SERVICE_ACCOUNT }}
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- name: Set up Cloud SDK
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uses: google-github-actions/setup-gcloud@v2
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- name: Extract @cba command
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id: parse_command
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run: |
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# Parse the @cba mention and extract the command
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COMMENT_BODY="${{ github.event.comment.body }}"
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# Extract text after @cba mention
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if [[ "$COMMENT_BODY" =~ @cba[[:space:]]+(.*) ]]; then
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COMMAND="${BASH_REMATCH[1]}"
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echo "command=$COMMAND" >> $GITHUB_OUTPUT
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echo "has_mention=true" >> $GITHUB_OUTPUT
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else
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# No @cba mention, triggered by label
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echo "has_mention=false" >> $GITHUB_OUTPUT
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# Determine action based on label
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if [[ "${{ contains(github.event.issue.labels.*.name, 'cba-review') || contains(github.event.pull_request.labels.*.name, 'cba-review') }}" == "true" ]]; then
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echo "command=review this PR" >> $GITHUB_OUTPUT
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elif [[ "${{ contains(github.event.issue.labels.*.name, 'cba-help') || contains(github.event.pull_request.labels.*.name, 'cba-help') }}" == "true" ]]; then
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echo "command=help with this issue" >> $GITHUB_OUTPUT
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fi
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fi
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- name: Set up Python
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uses: actions/setup-python@v5
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with:
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python-version: '3.11'
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- name: Install dependencies
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run: |
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pip install google-cloud-aiplatform anthropic requests
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- name: Run Codebase Agent
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id: run_agent
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env:
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COMMAND: ${{ steps.parse_command.outputs.command }}
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HAS_MENTION: ${{ steps.parse_command.outputs.has_mention }}
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
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GCP_PROJECT_ID: ambient-prototypes
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GCP_REGION: us-central1
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run: |
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python3 << 'PYTHON_SCRIPT'
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import os
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import json
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import requests
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from anthropic import Anthropic
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# Get environment variables
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command = os.environ.get('COMMAND', 'help')
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github_token = os.environ['GITHUB_TOKEN']
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anthropic_api_key = os.environ['ANTHROPIC_API_KEY']
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# GitHub context
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github_context = json.loads('''${{ toJson(github) }}''')
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event_name = github_context['event_name']
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print(f"🤖 Codebase Agent activated!")
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print(f"Command: {command}")
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print(f"Event: {event_name}")
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# Prepare context for Claude
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repo_name = github_context['repository']
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if event_name in ['issue_comment', 'pull_request_review_comment']:
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issue_number = github_context['event']['issue']['number']
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issue_url = github_context['event']['issue']['html_url']
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context_type = "comment"
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elif 'pull_request' in github_context['event']:
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issue_number = github_context['event']['pull_request']['number']
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issue_url = github_context['event']['pull_request']['html_url']
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context_type = "pull_request"
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elif 'issue' in github_context['event']:
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issue_number = github_context['event']['issue']['number']
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issue_url = github_context['event']['issue']['html_url']
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context_type = "issue"
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# Call Claude API (using Anthropic directly for now)
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# In production, this would call Vertex AI using the GCP service account
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client = Anthropic(api_key=anthropic_api_key)
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prompt = f"""You are the Codebase Agent (CBA) for the {repo_name} repository.
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You've been invoked with the command: {command}
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Context:
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- Type: {context_type}
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- URL: {issue_url}
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- Issue/PR: #{issue_number}
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Please provide a helpful, concise response that addresses the user's request.
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If this is a code review, focus on:
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1. Code quality and best practices
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2. Potential bugs or edge cases
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3. Documentation and testing suggestions
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4. Security considerations
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If this is a help request, provide:
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1. Clear explanation of the issue
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2. Actionable next steps
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3. Relevant documentation or examples"""
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message = client.messages.create(
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model="claude-3-5-sonnet-20241022",
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max_tokens=2000,
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messages=[{"role": "user", "content": prompt}]
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)
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response_text = message.content[0].text
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# Save response to file for next step
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with open('cba_response.txt', 'w') as f:
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f.write(response_text)
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print("✅ Codebase Agent response generated")
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PYTHON_SCRIPT
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- name: Post response to GitHub
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env:
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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run: |
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# Read the response from previous step
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RESPONSE=$(cat cba_response.txt)
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# Determine where to post the comment
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if [[ "${{ github.event_name }}" == "issue_comment" ]] || [[ "${{ github.event_name }}" == "pull_request_review_comment" ]]; then
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# Reply to the comment
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ISSUE_NUMBER="${{ github.event.issue.number }}"
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elif [[ "${{ github.event_name }}" == "pull_request" ]]; then
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ISSUE_NUMBER="${{ github.event.pull_request.number }}"
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elif [[ "${{ github.event_name }}" == "issues" ]]; then
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ISSUE_NUMBER="${{ github.event.issue.number }}"
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fi
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# Post comment using GitHub API
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curl -X POST \
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-H "Authorization: token $GITHUB_TOKEN" \
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-H "Accept: application/vnd.github.v3+json" \
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"https://api.github.com/repos/${{ github.repository }}/issues/$ISSUE_NUMBER/comments" \
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-d @- << EOF
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{
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"body": "## 🤖 Codebase Agent Response\n\n$RESPONSE\n\n---\n*Triggered by: ${{ github.event_name }} | Powered by Vertex AI*"
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}
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EOF
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echo "✅ Response posted to GitHub"
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- name: Add reaction to triggering comment
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if: github.event_name == 'issue_comment' || github.event_name == 'pull_request_review_comment'
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env:
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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run: |
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# Add 👀 reaction to show we're processing
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curl -X POST \
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-H "Authorization: token $GITHUB_TOKEN" \
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-H "Accept: application/vnd.github.v3+json" \
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"https://api.github.com/repos/${{ github.repository }}/issues/comments/${{ github.event.comment.id }}/reactions" \
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-d '{"content":"rocket"}'

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