Best agent skills for Codex

1

Brainstormingobra/superpowers

You MUST use this before any creative work - creating features, building components, adding functionality, or modifying behavior.

Shell

296k

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.

2

Improve Codebase Architecturemattpocock/skills

Scan a codebase for deepening opportunities, present them as a visual HTML report, then grill through whichever one you pick.

Shell

278k

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.

3

Golang Testingaffaan-m/ECC

Go testing patterns including table-driven tests, subtests, benchmarks, fuzzing, and test coverage.

JavaScript

274k

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.

4

PonytailDietrichGebert/ponytail

Forces the laziest solution that actually works, simplest, shortest, most minimal.

JavaScript

157k

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.

5

Autoplangarrytan/gstack

Auto-review pipeline — reads the full CEO, design, eng, and DX review skills from disk and runs them sequentially with auto-decisions using 6 decision principles.

TypeScript

136k

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.

6

Banner Designnextlevelbuilder/ui-ux-pro-max-skill

Design banners for social media, ads, website heroes, creative assets, and print.

Python

134k

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.

7

Browser Usebrowser-use/browser-use

Direct browser control via CDP for web interaction: automation, scraping, testing, screenshots, and site/app work.

Python

117k

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.

8

Safe RefactorJuliusBrussee/caveman

Restructure code while preserving behavior.

Go

110k

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.

9

Code Review And Qualityaddyosmani/agent-skills

Conducts multi-axis code review. Use before merging any change.

JavaScript

102k

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.

10

Clinical Case Reportnexu-io/open-design

Structured medical case presentation for clinical rounds, conferences, and documentation.

TypeScript

100k

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.