Best skills for OpenAI Codex
274 skills tracked·ranked quality-first·Updated July 2026
The short answer
Codex reads the open agent-skills standard, so the best Codex tools are the same well-structured, portable skills that lead on other platforms — plus AGENTS.md configurations that give the CLI real project context. Skill of Skills ranks 274 Codex-compatible tools by structural quality rather than stars.
OpenAI's Codex CLI builds on the open agent-skills standard, which means the Codex ecosystem overlaps heavily with the broader cross-tool skill pool. This guide ranks the Codex-compatible tools with the strongest quality signals so you can equip the CLI with skills that were engineered to be followed.
Top 12 ranked quality-first
| # | Skill | Tier | Quality | Risk | Platforms |
|---|---|---|---|---|---|
| 1 | affaan-m/ECC The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond. | Curated | 160 | high | Claude Code, Cursor, Codex |
| 2 | graphify AI coding assistant skill (Claude Code, Codex, OpenCode, Cursor, Gemini CLI, and more). Turn any folder of code, SQL schemas, R scripts, shell scripts, docs, papers, images, or videos into a queryable knowledge graph. App code + database schema + infrastructure in one graph. | Curated | 165 | high | Claude Code, Codex |
| 3 | openai/openai-agents-python A lightweight, powerful framework for multi-agent workflows | Promising | 109 | medium | Claude Code, Codex |
| 4 | cli-printing-press Every API has a secret identity. This finds it, absorbs every feature from every competing tool, then builds the GOAT CLI — designed for AI agents first, with SQLite sync, offline search, and compound insight commands. | Curated | 169 | high | Claude Code, Codex |
| 5 | openai/openai-agents-js A lightweight, powerful framework for multi-agent workflows and voice agents | Promising | 109 | medium | Claude Code, Codex |
| 6 | chopratejas/headroom Compress tool outputs, logs, files, and RAG chunks before they reach the LLM. 60-95% fewer tokens, same answers. Library, proxy, MCP server. | Promising | 117 | low | Claude Code, Codex |
| 7 | graphify AI coding assistant skill (Claude Code, Codex, OpenCode, Cursor, Gemini CLI, and more). Turn any folder of code, SQL schemas, R scripts, shell scripts, docs, papers, images, or videos into a queryable knowledge graph. App code + database schema + infrastructure in one graph. | Curated | 175 | high | Claude Code, Codex |
| 8 | openai/plugins OpenAI Plugins | Experimental | 75 | low | Claude Code, Codex |
| 9 | gbrain Garry's Opinionated OpenClaw/Hermes Agent Brain | Curated | 174 | high | Claude Code, Codex |
| 10 | modelcontextprotocol/ext-apps Official repo for spec & SDK of MCP Apps protocol - standard for UIs embedded AI chatbots, served by MCP servers | Promising | 102 | low | Claude Code, Codex |
| 11 | destructive_command_guard The Destructive Command Guard (dcg) is for blocking dangerous git and shell commands from being executed by agents. | Curated | 180 | high | Claude Code, Codex |
| 12 | gastown Gas Town - multi-agent workspace manager | Curated | 169 | medium | Claude Code, Cursor, Codex |
Showing the top 12 of 274. Scores are evidence-based quality metadata, not endorsements — review each skill's risk level and source before installing.
Frequently asked
addWhat format do Codex skills use?
Codex builds on the open agent-skills (SKILL.md) standard and also reads AGENTS.md for project configuration. Tools authored to these formats are portable across Codex and other compliant clients.
addIs this list specific to Codex?
It is filtered to Codex-compatible tools, but because the skill standard is cross-tool, many entries also work in Claude Code, Cursor, and other clients.