AI Commit Message Generator
A focused single-purpose tool: paste any git diff, get back a Conventional Commits message. The system prompt enforces the format strictly (type · scope · 72-char imperative subject · body that explains the WHY · optional footer for breaking changes or issue links). Streams in. Three example diffs (feature, fix, refactor) demonstrate the output shape. Lives at /commit. Real utility for every dev who's ever written 'fix stuff' as a commit message at 11pm.
Built in public to learn something or prove a pattern. Some are published packages, some are demos that live on this site.
- ▸Conventional Commits format has rules many devs don't remember at commit time
- ▸Bodies that just restate the diff add noise; the value is in explaining WHY the change happened
- ▸Engineers iterate constantly on commit messages — a tool that gets it 90% right beats the 50/50 they'd otherwise type
- ▸Strict system prompt enforcing the format and prohibiting WHAT-style bodies
- ▸Three curated example diffs so visitors see the output shape on three different change types (feature, fix, refactor)
- ▸Streamed output + one-click copy
Working tool, no signup, ready to copy-paste into a commit
Demonstrates focused prompt engineering — single-call structured output without an SDK
Reuses the shared streaming LLM route and rate limiter
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