A skill is a portable skill.md file — YAML frontmatter plus a markdown body — that you drop into Claude Code, Cursor, Windsurf, Copilot, or any other AI tool that reads project instructions. Every entry here downloads in the format you need, and carries a community-verified compatibility matrix showing which tools it actually works with.
Browse by category below, or contribute a skill you've built.
Migration Plan Writer
Draft an incremental database migration plan with rollback gates from a before/after schema diff — no single-shot migrations that can't be reversed.
Test Gap Finder
Combine coverage data with mutation-testing survivors to produce a ranked list of untested behaviors — the ones most likely to ship bugs.
API Changelog Generator
Diff two OpenAPI specs into a human-readable changelog with breaking-change flags, ready for release notes.
SQL Query Writer
Turn natural-language questions into validated, safe SQL against a known schema — with dry-run support.
Codebase Map
Compress an entire repo into a single LLM-digestible context bundle with an import graph and hot-file list.
