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Connect ChatGPT to Traveler.md

Connect Traveler.md to ChatGPT so it can read your Traveler.md and Trip.md files and keep them updated as you plan. ChatGPT calls this a custom MCP app, and it needs developer mode turned on before you can create one.

What you’ll need

  • A Plus, Pro, Business, Enterprise, or Education account. Developer mode and custom MCP apps work on all five.
  • ChatGPT on the web. Custom apps are not available in the mobile apps.
  • An admin, on workspace plans. On Business and Enterprise workspaces, an admin may need to allow custom MCP connectors first, in Workspace Settings → Permissions & Roles → Connected Data.

Step 1: Turn on developer mode

Open Settings → Security and login and turn on Developer mode.

ChatGPT labels this setting elevated risk, because developer mode lets you add unverified connectors that can modify or erase data. Traveler.md’s write tools only ever touch your own profile and your own trips.

Step 2: Create the Traveler.md app

  1. Go to Plugins in your settings and click the plus button to create a developer mode app for a remote MCP server.

  2. Name it Traveler.md, and describe it as reading and updating your Traveler.md travel profile and trips.

  3. Enter the server URL. Make sure it starts with https://.

    MCP server URL
    https://mcp.traveler.md/mcp

  4. Set the authentication method to OAuth. Sign in to Traveler.md, review the scopes, and approve.

Optionally add an icon with the Traveler.md logo (PNG, 256×256).

The app then appears under Drafts in your app settings. On a workspace plan the draft is yours alone until an admin publishes it to the workspace.

Step 3: Tell ChatGPT to use your files

Paste the instruction block below into your custom instructions, or into a custom GPT’s system prompt, so ChatGPT reaches for your files instead of answering from the conversation alone.

Send this to ChatGPT:

I use Traveler.md as my travel memory, so my preferences and my trips live in one place I can connect to the travel tools I use. There are two kinds of files, and I manage both on the Traveler.md platform: one profile with my lasting travel preferences, and one file per trip with the details for that trip. You can read and update both through the Traveler.md connector. Follow these rules whenever travel comes up: - Read before answering. For any travel-related request, first read my profile and the relevant trip file. Use what's there, and don't ask me for anything the files already contain. - If you can't reach my files, say so. Don't guess or invent preferences. Tell me the connector isn't responding so I can reconnect it. - Capture durable preferences immediately. When I state a lasting travel preference, even casually with no trip in progress (e.g. "I prefer aisle seats"), update my profile right away, then confirm in one line what changed. Make the actual update, don't just say you will. - Keep one-off details in the trip file. Needs specific to a single trip (e.g. "ground-floor room this time") go in that trip's file, not my profile. For that trip, the trip file overrides my general defaults. - One file per trip. Create a new trip file when a trip takes shape, store the itinerary and ideas in it, and update it as plans firm up. - Keep everything clean. No duplicates, and preserve existing entries unless you're correcting or replacing them. If a new preference conflicts with an old one, replace it and note the change. - Flag the edits that matter. Tell me briefly when you create a trip file or make a significant change, and skip announcing trivial ones.

Then start a chat, select Traveler.md from the tools menu or name it in your prompt, and ask “What do you know about my travel preferences?”

Good to know

  • Write actions ask for confirmation by default. ChatGPT shows you the input it is about to send, so you can check it before your profile or a trip changes.
  • Both MCP transports work. ChatGPT supports SSE and streaming HTTP. Traveler.md uses streaming HTTP.

Troubleshooting

  • No developer mode setting under Settings → Security and login? On a Business or Enterprise workspace, an admin has not allowed custom MCP connectors yet. Ask them to enable it in Workspace Settings → Permissions & Roles → Connected Data.
  • Scope or revocation change not reflected? Changes can take up to 15 minutes to propagate. The app keeps its current token until then, and picks up the change immediately if it re-authenticates.
  • Other issues: see Support.
Reference

ChatGPT developer mode