# Best agent skills for Codex > The best agent skills for Codex are Brainstorming, Improve Codebase Architecture and Golang Testing, ranked by GitHub stars; Brainstorming leads with 296,071 stars. The list covers 750 agent skills in the appsgit catalog, one entry per repository. ## Key facts | Fact | Value | |---|---| | Question | What are the best agent skills for OpenAI Codex? | | Picks | 10 | | Top pick | Brainstorming (296,071 stars) | | Data as of | Oct 7, 2026 | | Canonical URL | https://appsgit.com/best/skills-for-codex | ## Ranked picks - [Brainstorming](https://appsgit.com/skills/obra-brainstorming) (296,071 stars, MIT, Shell): Brainstorming has 296,071 GitHub stars, has 382,478 installs on skills.sh, runs without an API key, works with Claude Code, Codex and Cursor, is written in Shell and was last updated in September 2026. - [Improve Codebase Architecture](https://appsgit.com/skills/mattpocock-improve-codebase-architecture) (278,361 stars, MIT, Shell): Improve Codebase Architecture has 278,361 GitHub stars, has 1,057,293 installs on skills.sh, runs without an API key, works with Claude Code and Codex, is written in Shell and was last updated in October 2026. - [Golang Testing](https://appsgit.com/skills/affaan-m-golang-testing) (274,402 stars, MIT, JavaScript): Golang Testing has 274,402 GitHub stars, has 3 installs on skills.sh, runs without an API key, works with Claude Code, Codex and Cursor, is written in JavaScript and was last updated in October 2026. - [Ponytail](https://appsgit.com/skills/dietrichgebert-ponytail) (156,966 stars, MIT, JavaScript): Ponytail has 156,966 GitHub stars, has 72,989 installs on skills.sh, runs without an API key, works with Claude Code, Codex and Cursor, is written in JavaScript and was last updated in October 2026. - [Autoplan](https://appsgit.com/skills/garrytan-autoplan) (135,577 stars, MIT, TypeScript): Autoplan has 135,577 GitHub stars, runs without an API key, works with Claude Code, Codex and Cursor, is written in TypeScript and was last updated in October 2026. - [Banner Design](https://appsgit.com/skills/nextlevelbuilder-banner-design) (133,647 stars, MIT, Python): Banner Design has 133,647 GitHub stars, runs without an API key, works with Claude Code, Codex and Cursor, is written in Python and was last updated in October 2026. - [Browser Use](https://appsgit.com/skills/browser-use) (117,307 stars, MIT, Python): Browser Use has 117,307 GitHub stars, is published by the vendor itself, has 96,300 installs on skills.sh, needs an API key or token, works with Claude Code, Codex and Cursor, is written in Python and was last updated in October 2026. - [Safe Refactor](https://appsgit.com/skills/juliusbrussee-safe-refactor) (110,252 stars, Apache-2.0, Go): Safe Refactor has 110,252 GitHub stars, has 86,376 installs on skills.sh, runs without an API key, works with Claude Code, Codex and Cursor, is written in Go and was last updated in October 2026. - [Code Review And Quality](https://appsgit.com/skills/addyosmani-code-review-and-quality) (102,166 stars, MIT, JavaScript): Code Review And Quality has 102,166 GitHub stars, has 56,497 installs on skills.sh, runs without an API key, works with Claude Code, Codex and Cursor, is written in JavaScript and was last updated in October 2026. - [Clinical Case Report](https://appsgit.com/skills/nexu-io-clinical-case-report) (99,748 stars, Apache-2.0, TypeScript): Clinical Case Report has 99,748 GitHub stars, runs without an API key, works with Claude Code, Codex and Cursor, is written in TypeScript and was last updated in September 2026. ## How this list was made - Only skills whose compatibility data lists Codex (750 of 1,000). - Ranked by GitHub stars (installs on skills.sh break ties), at most one entry per repository so one project cannot fill the list. - The catalog itself only lists skills with a valid SKILL.md, a license and a commit in the last six months, from repositories with 100+ stars or a skills.sh listing. ## FAQ ### Do these agent skills need an API key? 1 of the 10 picks need an API key or token, for example Browser Use; 9 run without one. Each page on appsgit lists the environment variables a agent skill expects. ### Which coding agents work with these skills? Claude Code (all), Codex (all), Cursor (9 of 10) and GitHub Copilot (8 of 10). The client list comes from each project's published compatibility data; appsgit does not guess it. ### Are any of these agent skills official? Yes: Browser Use is published by the vendor itself. ### How do I install an agent skill? A skill is a folder with a SKILL.md file that you copy into your agent's skills directory, or install from a plugin marketplace when the repository is one. Every skill page on appsgit shows the install command. ## Related questions - [Which agent skills are trending right now?](https://appsgit.com/best/trending-skills) - [What are the best open source AI agents and agent frameworks?](https://appsgit.com/best/open-source-ai-agents) - [What are the best tools to run an LLM locally?](https://appsgit.com/best/local-llm) - [What are the best MCP servers for databases?](https://appsgit.com/best/mcp-servers-for-databases) - [What are the best MCP servers for developer tools?](https://appsgit.com/best/mcp-servers-for-developer-tools) - [What are the best MCP servers for web browsing and scraping?](https://appsgit.com/best/mcp-servers-for-web-browsing-scraping) - [What are the best MCP servers for productivity?](https://appsgit.com/best/mcp-servers-for-productivity) - [What are the best MCP servers for cloud and DevOps?](https://appsgit.com/best/mcp-servers-for-cloud-devops) ## See also - [All agent skills](https://appsgit.com/skills) - [Trending agent skills](https://appsgit.com/skills/trending) - [Official agent skills](https://appsgit.com/skills/official) --- Canonical page: https://appsgit.com/best/skills-for-codex Source: appsgit (https://appsgit.com), the app store for github. Data from the GitHub API, refreshed nightly. Machine access: JSON API https://appsgit.com/api/v1/apps (OpenAPI: https://appsgit.com/openapi.json), MCP server https://mcp.appsgit.com/mcp, full index https://appsgit.com/llms-full.txt.