Building a PR Review Agent: My Transition from Learning Scripts to Real Tools (Phase 3)

The author describes Phase 3 of their AI agent learning journey, where they transitioned from manual Python orchestration to using Hugging Face's smolagents framework to build a practical PR Review Agent. The agent takes a GitHub PR URL, fetches the diff and repo guidelines, and generates a PR title and description. Key lessons include the importance of clear tool docstrings as contracts, favoring single-agent architecture over multi-agent hype, and splitting tools into granular functions for better reliability.