ChatGPT

The ChatGPT desktop app has two parts: Chat, the usual conversation, and Codex, an assistant that works with programs and files on your PC. XIV MCP works in Codex. Chat only connects to MCP servers on the internet, so it cannot reach the game, which runs on your PC.

One clickCopy Anchor Link

In /xivmcp → Connect, choose ChatGPT and click the button. XIV MCP adds itself to ~/.codex/config.toml, the file that Codex in the ChatGPT desktop app, the Codex CLI and the IDE extension share.

• The rest of the file is kept.
• The previous file is saved as config.toml.xivmcp-backup.
• Restart ChatGPT afterwards, so Codex reads the new entry.

By handCopy Anchor Link

Codex can read the token from an environment variable. In PowerShell, store the token:

setx XIVMCP_TOKEN "<token>"

Then open a new terminal, so it sees the variable, and add the server before you start Codex:

codex mcp add ffxiv `
  --url http://localhost:37521/mcp `
  --bearer-token-env-var XIVMCP_TOKEN

Or add the server to ~/.codex/config.toml directly:

[mcp_servers.ffxiv]
url = "http://localhost:37521/mcp"
http_headers = { "Authorization" = "Bearer <token>" }

Replace <token> with the token from /xivmcp → Connect.

Removing itCopy Anchor Link

See Removing XIV MCP from an app.