# Agent skills

> Real engineering practice, packaged as skills your AI coding agent can install. Add one to Claude Code, Cursor, Codex, GitHub Copilot, or Gemini CLI, and it builds the way we do: the techniques we rely on, and the anti-patterns we avoid.

- URL: https://evilmartians.com/agent-skills

- [design-system](https://github.com/ymandrikov/ai-design-system): Create and maintain a consistent design system through component contracts, inventories, and verification, with separate workflows for evolving the system and building interfaces with it.
- [llms-visibility](https://github.com/evilmartians/agent-skills): Make a site readable to ChatGPT, Claude, Perplexity, and the coding agents that fetch URLs: Markdown routes, Accept content negotiation, llms.txt, and crawler signals in robots.txt. Pushes back on the AI-SEO advice we tested and found useless.
- [intent-log](https://github.com/irinanazarova/intent-log): Keep a shared record of what a person actually wanted, one short list per day tagged with the PRs it produced, so a teammate can catch up on a burst of agent-assisted work without reading every pull request. Written by the agent at the end of a session, not by hand.
- [storybook-workbench](https://github.com/strongeron/storybook-workbench): Eleven skills that turn Storybook into an audit layer for vibe-coded React and Vite apps: tell real components from dead ones, map routes and flows, check design-system health, bridge Figma both ways, and write CSF3 stories for the states that matter.
- [layered-rails](https://github.com/palkan/skills): Write, refactor, and review Rails code by the principles from the Layered Design for Ruby on Rails Applications book: service, form, policy, and query objects, plus a codebase analysis that scores callbacks, finds god objects by churn and complexity, and flags layer violations in a diff.
- [good-readme](https://github.com/evilmartians/agent-skills): Write or rewrite an open source README the way PostCSS, Nano ID, imgproxy, and AnyCable did it: lead with what the project does and how it differs, drop the badges, and never invent a benchmark the repo can't back up.
- [inertia-rails-skills](https://github.com/inertia-rails/skills): Fixes what LLMs get wrong about Inertia.js on Rails, across React, Vue 3, and Svelte: controllers and prop types, forms without react-hook-form, pages and navigation, shared-prop typing, shadcn/ui, and Alba serializers with auto-generated types.
- [skills-visibility](https://github.com/evilmartians/agent-skills): Publish a catalog of agent skills and make it discoverable to AI coding agents: the .well-known/agent-skills/index.json index, integrity digests, single-file vs multi-file vs bundle packaging, and every install method. Pushes back on pointing the index at raw GitHub URLs instead of a domain you control.
- [secure-npm-package](https://github.com/evilmartians/agent-skills): Release an npm package with no token left to steal: Trusted Publishing, provenance, and staged publishes from a single GitHub Actions workflow, plus click-by-click npmjs.com and GitHub settings with every URL resolved from your own package.json.
- [rails-boot-profiling](https://github.com/palkan/require-profiler): Profile Rails boot time with require-profiler: find the slowest requires and initializers, catch boot-time YAML parsing and HTTP calls, deep-dive into stubborn files with Stackprof, and turn the findings into fixes that speed up your Rails app startup.
- [tailwind-best-practices](https://github.com/evilmartians/agent-skills): Writes and audits Tailwind CSS with the five practices that keep a fast-to-write codebase maintainable: design tokens over magic values, short and consistently ordered class lists, semantically grouped tokens, and fixed variants for design-system components instead of arbitrary className props.
- [web-video](https://github.com/evilmartians/agent-skills): Encode a video for the web with one ffmpeg script: AV1, HEVC, and H.264 MP4s plus a poster and the video tag with its sources in the right order, or VP9 and HEVC with alpha for a transparent video that plays in both Safari and Chrome.