MCP & skills

Extend Codex by connecting tools through MCP servers and installing reusable skills, all from CodexUse Settings without hand-editing config files.

MCP servers

The Model Context Protocol (MCP) gives Codex access to external tools such as docs, APIs, and internal services. Add one in Settings:

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)

The marketplace installs vetted MCP servers in one click during the trial. Pro keeps one-click installs unlocked after the trial.

• Browse verified MCP servers.
• Install with one click.
• Manual MCP setup is available during the trial.

Skills

Skills are reusable instruction bundles stored in ~/.codex/skills, one folder per skill.

• Each skill has a SKILL.md file.
• Create skills in-app during the trial; Pro keeps marketplace installs unlocked afterward.
• Uninstalling removes the local files only.

AGENTS.md

AGENTS.md holds persistent agent instructions that carry across sessions.

• Global instructions apply across your Codex workspaces.
• Workspace-level instructions override the global ones when present.
• Keep them concise and specific.