Sphinx is a Git hook that quizzes developers on AI-generated code before pushing

Sphinx is a free, open-source Git hook that asks a developer a question about what an agent's code does before the push continues. The questions are generated from the diff, and a wrong answer prompts another scenario.

The page says it works with Codex, Claude Code, Cursor, OpenCode, Pi, or plain Git, and that it runs on minimal tokens through an existing agent, OpenRouter, or any OpenAI-compatible endpoint.