A GitHub code review bot that automatically analyzes pull requests using Claude AI and posts review comments.

• Responds to GitHub pull request webhooks
• Analyzes code changes using Anthropic's Claude
• Posts detailed review comments on PRs
• Secure webhook signature verification

1. GitHub Token: Create a fine-grained personal access token with:

   • Repository access to your target repo
   • Metadata: Read-only
   • Contents: Read-only
   • Pull requests: Read and write

2. Anthropic API Key: Get your API key from Anthropic Console

3. Environment Variables: Set these in Val Town:

   • GITHUB_TOKEN: Your GitHub personal access token
   • ANTHROPIC_API_KEY: Your Anthropic API key
   • WEBHOOK_SECRET: A random secret string for webhook verification

4. GitHub Webhook: Configure in your repository settings:

   • Payload URL: Your Val Town HTTP endpoint
   • Content type: application/json
   • Secret: Same as WEBHOOK_SECRET
   • Events: Pull requests

The bot automatically reviews pull requests when they are opened or reopened. It will:

1. Fetch the changed files from the PR
2. Analyze the code using Claude
3. Post a review comment with findings

• index.ts - Main webhook handler and review logic
• github.ts - GitHub API integration
• claude.ts - Claude AI integration
• utils.ts - Utility functions for webhook verification