The original title is "Create a Custom AI PR Reviewer from scratch with GitHub Actions"

Short summary

A step-by-step tutorial shows how to build a custom AI PR reviewer using GitHub Actions and the Gemini API with a short Python script. The workflow triggers on PR events, extracts the git diff, sends it to Gemini for structured review, and posts inline comments back to the PR. No heavy third-party platform is required, making it a lightweight alternative to tools like CodeRabbit or Copilot.

• •Build a dependency-free AI code reviewer inside GitHub Actions
• •Uses Gemini API with structured output for line-by-line review
• •Covers trigger setup, diff extraction, API call, and inline comment posting

Generated with AI, which can make mistakes.