Install Fatsecret in Codex

What you need first

• Codex, installed.
• uv, which gives the uvx command the server starts with.
• Your own values for YOUR_FATSECRET_CONSUMER_KEY,YOUR_FATSECRET_CONSUMER_SECRET,YOUR_FATSECRET_MCP_SIGNING_KEY,YOUR_FATSECRET_MCP_USERS.

Steps

1. Run this in a terminal. It writes the server into ~/.codex/config.toml, which the Codex CLI, its IDE extension and the ChatGPT desktop app share.

codex mcp add fatsecret-mcp --env FATSECRET_CONSUMER_KEY=YOUR_FATSECRET_CONSUMER_KEY --env FATSECRET_CONSUMER_SECRET=YOUR_FATSECRET_CONSUMER_SECRET --env FATSECRET_MCP_SIGNING_KEY=YOUR_FATSECRET_MCP_SIGNING_KEY --env FATSECRET_MCP_USERS=YOUR_FATSECRET_MCP_USERS -- uvx fatsecret-mcp==0.1.0

2. Replace YOUR_FATSECRET_CONSUMER_KEY,YOUR_FATSECRET_CONSUMER_SECRET,YOUR_FATSECRET_MCP_SIGNING_KEY,YOUR_FATSECRET_MCP_USERS with your own values.
3. Start Codex again and type /mcp: the server is listed.

Check it worked

Ask Codex: List the tools of fatsecret-mcp.

If it does not start

spawn uvx ENOENT

uv is not on the PATH that Codex sees. Install it, or write the full path of uvx in the config.

The server starts, but its tools fail

A YOUR_… placeholder is still in the config, or its value is wrong.