How to install PreReason in Codex

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

Built from the published package · server updated 3 days ago

Run the install command

In a terminal, run:

codex mcp add prereason -- npx -y @prereason/mcp

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

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Does PreReason work in Codex?

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

PreReason 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 PreReason safe?

It scores 82 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.