Connect FuelKit to ChatGPT

FuelKit speaks MCP (Model Context Protocol), which ChatGPT supports through developer mode. Fair warning up front: the experience depends heavily on your ChatGPT plan — read the plan notes below before setting it up.

Plan limitations (read this first)

• Custom MCP connectors require a paid ChatGPT plan and are set up on the web, in beta.
• On Plus and Pro (individual) plans, custom connectors are effectively read-only: ChatGPT can look things up ("what's on my grocery list?", "what did I eat today?") but the tools that write — logging food, creating recipes, editing the plan — are restricted to Business, Enterprise, and Edu workspaces.
• If you want the full log-and-plan-by-chat experience on a personal plan, connect Claude instead — Claude supports FuelKit's read and write tools on every plan.

Set up the connection

1. In ChatGPT on the web, open Settings → Apps (formerly Connectors) → Advanced settings and turn on Developer mode.

2. Add a new connector: name it FuelKit, with the MCP server URL:

   https://mcp.fuelkit.app/mcp
   

3. Complete the sign-in: you'll be sent to FuelKit to authenticate with Google and approve access.

4. In a conversation, enable the FuelKit connector from the tools/plugins picker.

What you can do

Within your plan's limits: review your day or week, check the grocery list, look up foods and recipes, and compare tracked grocery prices. On workspace plans with write access, everything described in the Claude article works here too.

Troubleshooting

• "I can't find developer mode" — it's web-only, under Settings → Apps → Advanced settings, and requires a paid plan.
• ChatGPT refuses to log food — that's the write restriction on individual plans, not a FuelKit error.
• Stale tools after a FuelKit update — remove and re-add the connector to refresh its tool list.