MCP & skills

Extend CodexUse by connecting tools (MCP servers) and installing reusable skills.

MCP servers

Model Context Protocol (MCP) lets Codex access tools like docs, APIs, and internal services.

1. Open Settings → MCP Servers.
2. Select a protocol: stdio, http, or sse.
3. Paste the command or URL and save.

npx -y @mcp/server-filesystem ~/Documents/docs
https://mcp.deepwiki.com/mcp

Marketplace (Pro)

• Browse verified MCP servers.
• Install with one click.
• Manual MCP setup stays free.

Skills

Skills are instruction bundles stored in ~/.codex/skills.

• Each skill has a SKILL.md file.
• Create skills in-app or install from GitHub (Pro).
• Uninstall removes local files only.

AGENTS.md

Use AGENTS.md for persistent agent instructions across sessions.

• Global instructions apply across all projects.
• Project-level instructions override when needed.
• Keep them concise and specific.