How to install Brain in Codex

To install Brain in Codex, run "codex mcp add brain -- npx -y @schlessera/brain" in your terminal, then type /mcp in Codex to check it.

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Run the install command

In a terminal, run:

codex mcp add brain -- npx -y @schlessera/brain

MCP servers run with your permissions. If Brain needs an API key, add it under env in the config. Check its README.

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Does Brain work in Codex?

Yes. Codex supports mcp servers in the codex cli and ide extension, and Brain installs with the steps above.

Brain does not show up in Codex. What now?

Restart Codex fully, check the JSON is valid, and make sure Node.js (for npx) is installed. See common MCP errors and fixes.

Is Brain safe?

It scores 84 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.