How to install langfuse in Codex

To install langfuse in Codex, run "codex mcp add langfuse --env LANGFUSE_SECRET_KEY=YOUR_LANGFUSE_SECRET_KEY --env LANGFUSE_PUBLIC_KEY=YOUR_LANGFUSE_PUBLIC_KEY -- npx -y langfuse-observability-mcp-server" in your terminal, then type /mcp in Codex to check it.

Built from the published package · server updated 13 days ago

Run the install command

In a terminal, run:

codex mcp add langfuse --env LANGFUSE_SECRET_KEY=YOUR_LANGFUSE_SECRET_KEY --env LANGFUSE_PUBLIC_KEY=YOUR_LANGFUSE_PUBLIC_KEY -- npx -y langfuse-observability-mcp-server

2
Check it
Inside Codex, type /mcp to see the server and its tools.

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

Install langfuse in another app

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Questions

Does langfuse work in Codex?

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

langfuse 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 langfuse safe?

It scores 83 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.