# Use This Skill

> A directory of 2,043 agent skills (SKILL.md files) for Claude Code, Codex, Cursor and other coding agents. Proven skills show the same brief built by Claude twice, once without the skill and once with it, as two live pages side by side.

Use This Skill answers one question: what does this skill actually change? Most skill directories rank by GitHub stars or install counts. Use This Skill records the model, the brief and the exact skill version, runs the comparison, and publishes both results so anyone can judge or re-run it.

## Start here

- [Home](https://usethisskill.com/): the free proof, live, with a draggable divider
- [Proven skills](https://usethisskill.com/proven): every skill with a with-and-without comparison
- [All skills](https://usethisskill.com/skills): search the full directory by task or category
- [Claude skills](https://usethisskill.com/claude-skills), [Codex skills](https://usethisskill.com/codex-skills), [Cursor skills](https://usethisskill.com/cursor-skills), [Gemini CLI skills](https://usethisskill.com/gemini-skills): the directory by agent, with install paths and proofs
- [How proofs work](https://usethisskill.com/methodology): fixed brief written from the SKILL.md, three runs with and three without on the same model, exact commit recorded, published whatever the result, including paid proofs
- [Scan your repository](https://usethisskill.com/scan): CLI (npx github:nodegenie/awesome-agent-skills scan) and GitHub Action (nodegenie/awesome-agent-skills/scan@main); free for public repositories, Team $29/month for private
- [Safety scan](https://usethisskill.com/safety): every skill folder is scanned for fetch-and-execute, destructive, credential, exfiltration, obfuscation and rules-override patterns; results are on each skill page
- [Are agent skills safe?](https://usethisskill.com/guides/are-agent-skills-safe): what the weekly scan of every skill in the directory found, with the flagged skills read by hand
- [Best Claude Code skills for frontend design, tested](https://usethisskill.com/guides/best-frontend-design-skills): Nine design skills, each run 3 times without and 3 with on the same brief. Pick frontend-design for pages, ui-ux-pro-max for app screens.
- [Skills vs subagents vs slash commands in Claude Code](https://usethisskill.com/guides/skills-vs-subagents-vs-slash-commands): A skill adds instructions to the conversation, a subagent does work in its own context and reports back, and slash commands are now skills. When to use each, with the files and settings.
- [How to use a skill](https://usethisskill.com/how-to-use-skills): what a SKILL.md is, where the folder goes for Claude Code, Codex, Cursor and Gemini CLI, and how to install one
- [Pricing](https://usethisskill.com/pricing): the directory is free; a one-time Pro purchase unlocks every proof ($99 founding price for the first 200 buyers, then $149)
- [Prove my skill](https://usethisskill.com/prove): skill authors can order a published with-and-without proof of their own skill ($49), or a custom skill written and proven ($499)

## MCP server

Use This Skill is available as a remote MCP server at https://usethisskill.com/mcp (Streamable HTTP, no auth required; tools: search_skills, get_skill, list_proven, get_proof, order_proof). Setup: https://usethisskill.com/connect

## Proven skills

- [canvas-design](https://usethisskill.com/skills/canvas-design): "Build the one-page site for Blue Hour, a monthly jazz night at a small club: a poster-style hero with a drawn inline SVG illustration, the lineup with short bios, the schedule, a photo-strip section drawn with SVG, ticket tiers, and a footer with the address."
- [frontend-design](https://usethisskill.com/skills/frontend-design): "Build the marketing landing page for Halcyon, a calm AI calendar app for busy founders."
- [theme-factory](https://usethisskill.com/skills/theme-factory): "Build the one-page invitation site for the Harvest Table, a community garden's autumn dinner: a hero with the date and place, the story of the garden, the menu by course, the people cooking, a map drawn in inline SVG, and an RSVP form with success and error states."
- [ui-ux-pro-max](https://usethisskill.com/skills/ui-ux-pro-max): "Build the dashboard home screen for Tally, a personal finance app: a sidebar, a header with the account switcher, a balance hero, a monthly spending chart drawn with inline SVG, a recent transactions list, budget progress cards, and an upcoming bills panel."
- [tailwind-design-system](https://usethisskill.com/skills/tailwind-design-system): "Build the shop page for Verdant, an online plant shop: a header, a filter sidebar with categories, light and price, a responsive product grid with at least nine plants drawn in inline SVG, prices, ratings, add-to-cart buttons with a cart count that updates, and a footer."
- [web-design-guidelines](https://usethisskill.com/skills/web-design-guidelines): "Build the sign-up page for Lantern, a weekly newsletter on independent software businesses."
- [accessibility-compliance](https://usethisskill.com/skills/accessibility-compliance): "Build the settings page for a team workspace app with tabs for Profile, Notifications and Privacy, including toggles, a select menu, a danger zone, and save and cancel buttons with success and error states."
- [brand-guidelines](https://usethisskill.com/skills/brand-guidelines): "Build a one-page internal announcement for Relay, a new on-call handoff tool the platform team is rolling out next month."
- [internal-comms](https://usethisskill.com/skills/internal-comms): "Write this week's status update for the Checkout Redesign project as a single HTML page for the leadership channel."
- [changelog-generator](https://usethisskill.com/skills/changelog-generator): "Turn these git commits into a user-facing changelog page for version 2.4.0 of Ledgerly, a small-business invoicing app, as a single HTML page."
- [test-driven-development](https://usethisskill.com/skills/test-driven-development): "Implement a function that parses a cron expression (the standard five fields) and returns the next run time after a given date, in TypeScript."
- [writing-plans](https://usethisskill.com/skills/writing-plans): "Write the implementation plan for adding team accounts to a solo-user invoicing SaaS (Next.js, Postgres, Stripe): users must be able to create a team, invite members by email, assign owner or member roles, and share clients and invoices within the team, with billing moving from the user to the team."
- [skill-creator](https://usethisskill.com/skills/skill-creator): "Write a complete SKILL.md for a skill called release-notes that turns a list of merged pull request titles into customer-facing release notes grouped by feature, fix and breaking change, in the tone of a small developer-tools company."
- [systematic-debugging](https://usethisskill.com/skills/systematic-debugging): "A Node.js API returns 500 for about 1 in 200 requests to POST /orders."
- [algorithmic-art](https://usethisskill.com/skills/algorithmic-art): "Make a generative art piece called Tidewater: a single HTML page with a full-window canvas that draws slow, layered flow-field lines in a deep sea palette, seeded so the same seed always gives the same picture."
- [web-artifacts-builder](https://usethisskill.com/skills/web-artifacts-builder): "Build a single-page trip planner for a four-day weekend in Lisbon as one self-contained HTML file: a day-by-day itinerary with editable stops, a running budget that totals by category, a packing checklist with progress, and a simple map panel drawn with inline SVG that highlights the selected day's stops."
- [brainstorming](https://usethisskill.com/skills/brainstorming): "A small bakery with one location wants more weekday morning customers."
- [vercel-react-best-practices](https://usethisskill.com/skills/vercel-react-best-practices): "Here is a slow Next.js product list page."
- [vercel-composition-patterns](https://usethisskill.com/skills/vercel-composition-patterns): "Refactor this React Modal component."
- [writing-guidelines](https://usethisskill.com/skills/writing-guidelines): "Review and rewrite this getting-started page for Pipewell, a data pipeline CLI."
- [mcp-builder](https://usethisskill.com/skills/mcp-builder): "Build an MCP server in TypeScript that gives an agent read access to a team's Linear-style issue tracker through a REST API: tools to search issues, get one issue with comments, and list a project's open issues by priority."
- [vercel-react-view-transitions](https://usethisskill.com/skills/vercel-react-view-transitions): "Build a photo gallery for a small travel photographer as a single HTML page using React from a CDN: a grid of twelve photos drawn with inline SVG or CSS gradients, where clicking a photo smoothly expands it into a detail view with a caption and location, and going back animates it into its place in the grid."
- [tdd](https://usethisskill.com/skills/tdd): "Implement a function that parses a cron expression (the standard five fields) and returns the next run time after a given date, in TypeScript."
- [improve-codebase-architecture](https://usethisskill.com/skills/improve-codebase-architecture): "Here is the orders module of a small Express app."
- [prototype](https://usethisskill.com/skills/mattpocock-prototype): "We are designing the order state model for a food delivery app."
- [triage](https://usethisskill.com/skills/triage): "You are triaging three new issues on an open-source Markdown editor."
- [grilling](https://usethisskill.com/skills/grilling): "Here is my plan."
- [design-taste-frontend](https://usethisskill.com/skills/design-taste-frontend): "Build the homepage for Fieldnote, a field-recording gear shop run by two sound engineers in Portland."
- [ui-styling](https://usethisskill.com/skills/ui-styling): "Build the main screen of Quayside, an internal tool a small logistics company uses to track container shipments: a sidebar, a filter bar, a table of 12 shipments with status, ETA and port, a detail panel for the selected shipment with a timeline, and an empty state for when filters match nothing."

## How a proof is made

1. One brief is written once and never changed.
2. Claude builds it twice on the same model: once with no skill, once with the skill loaded.
3. Both results are saved as self-contained HTML pages, with the model and the skill's git commit recorded.

## Who makes it

Built by Tineessa Nelson (@tineessavm on X). Contact: hello@usethisskill.com. Skills belong to their authors; every listing links to its source repository. Not affiliated with Anthropic, OpenAI or Cursor.

## Full index

- [llms-full.txt](https://usethisskill.com/llms-full.txt): every skill in the directory with its description and install command
- [Sitemap](https://usethisskill.com/sitemap.xml)