Built DocuPilot: auto documentation GitHub App powered by Claude API

[AkrMcmr]

Built DocuPilot using Claude API — a GitHub App that auto-generates documentation (README, CHANGELOG, API docs) every time you push code.

Why Claude API

I chose Claude for the core doc generation because:

• Long context: Code diffs + existing docs can be large. Claude handles this well.
• Structured output: Claude excels at generating well-formatted markdown with proper headings, code blocks, and tables.
• Instruction following: The system prompt specifies doc structure, tone, and format — Claude follows it consistently.
• Quality: The generated docs read naturally, not like typical AI output.

Architecture

GitHub push webhook
  → Vercel serverless function
  → Fetch diff via GitHub API
  → Send to Claude API with system prompt + diff + existing docs
  → Parse response into file updates
  → Create Pull Request via GitHub API

Uses the @anthropic-ai/sdk (JS/TS SDK) with maxDuration=60 for longer generations.

Example output

Real PR generated by DocuPilot + Claude: docupilot-test#3 — 147 lines of auto-generated docs from a code push.

Try it

Free for 1 repo, forever. No credit card.

🔗 docupilot-alpha.vercel.app | Source | Install

Happy to answer questions about using Claude API for developer tools!