Agent Skills

Free AI agent skills from GitHub, tested by a small, cheap model (Haiku). Further right means Haiku used it right more often.

How a skill is tested

A skill is a file that teaches an AI coding agent how to do one job. We test each one with a small, cheap model (Haiku), because if a small model gets it right, a big one will too.

  1. Picked right. Haiku sees the list of skills, like a real agent does, and gets 3 requests: 2 where this skill should be used and 1 that only sounds similar. It scores a point for each request it sends the right way.
  2. Followed right. Haiku reads the whole skill and a real request, then says its first step. A second Haiku call checks that step against the one the skill asks for.

Score: 1 point per request picked right (3) plus 2 points for following right, out of 5, shown out of 100. Further right is better. Green is 80 and up, amber 50 to 79, red below 50. Pick a kind of skill to see them as a leaderboard, best first. Haiku only sees skills from the same repo when it picks, as if you had installed that one collection. The test questions were written from each skill's own text by a stronger model, so a skill is never graded on something it does not claim to do. Last run: claude-haiku-4-5-20251001, 2026-10-28.

The same skills as a table
SkillFromWhat it doesScorePicked rightFollowed right
doc-coauthoring anthropics/skillsWrite a spec, RFC or design doc in three steps: gather context, shape it, test it on a fresh reader. 100 3/3 1/1
diagram garrytan/gstackTurn a text description into a diagram: mermaid source, editable Excalidraw file, SVG and PNG. 60 3/3 0/1
document-generate garrytan/gstackWrite missing docs from scratch for a feature, module or project, using the Diataxis four-part layout. 60 3/3 0/1
document-release garrytan/gstackAfter you commit, before merge, check that docs still match the code and fix them. 60 3/3 0/1
domain-modeling mattpocock/skillsBuild and sharpen the project's domain language: write GLOSSARY.md and decision records (ADRs). 80 2/3 1/1
research mattpocock/skillsSend a background agent to read primary sources and save the findings, with citations, as Markdown. 100 3/3 1/1
writing-for-agents mattpocock/skillsStyle guide for docs agents read: skills, AGENTS.md and CLAUDE.md, with context pointers. 60 3/3 0/1
agents-md getsentry/skillsWrite and keep short AGENTS.md and CLAUDE.md files that tell coding agents how your repo works. 100 3/3 1/1
doc-coauthoring getsentry/skillsWalk through writing a spec, proposal or decision doc in stages with the user. 100 3/3 1/1
document-api-endpoint getsentry/skillsDocument and type a Sentry API endpoint with schema decorators and response types. 100 3/3 1/1
writing-user-docs callstackincubator/agent-skillsHouse style for user-facing docs. Voice, scope, structure and what to cut. 60 3/3 0/1
architecture-decision-records wshobson/agentsWrite and keep ADRs that say why a technical choice was made. 60 3/3 0/1
changelog-automation wshobson/agentsMake changelogs and release notes from commits in Keep a Changelog style. 60 3/3 0/1
openapi-spec-generation wshobson/agentsWrite and check OpenAPI 3.1 specs from code or design-first. 60 3/3 0/1
postmortem-writing wshobson/agentsWrite blameless postmortems with timeline, root cause and action items. 100 3/3 1/1
runbook-generator alirezarezvani/claude-skillsMake ops runbooks for deploy, incident, maintenance and rollback. 100 3/3 1/1
code-documenter Jeffallan/claude-skillsAdd docstrings, JSDoc, OpenAPI specs and user guides to code. 60 3/3 0/1
spec-miner Jeffallan/claude-skillsRead old code with no docs and pull out the real specs and dependencies. 60 3/3 0/1
codebase-onboarding affaan-m/everything-claude-codeMap an unfamiliar repo and write an onboarding guide plus a starter CLAUDE.md. 100 3/3 1/1
update-docs NeoLabHQ/context-engineering-kitUpdate docs, READMEs, JSDoc and API docs to match local code changes. 100 3/3 1/1
repomix mrgoonie/claudekit-skillsPack a whole repo into one AI-ready file with include and exclude rules. 60 3/3 0/1
mermaidjs-v11 mrgoonie/claudekit-skillsDraw flowcharts, sequence, ER and class diagrams in Mermaid v11. 60 3/3 0/1
project-docs jezweb/claude-skillsWrite ARCHITECTURE, API endpoints and DB schema docs by reading the code. 60 1/3 1/1