Memory + tools for any AI assistant
Your AI forgets.
Your cubby doesn’t.
MCP Cubby is a private, permanent record that Claude, ChatGPT, Cursor or any MCP agent can read and write. Calculations run as real code, not model guesses, so the numbers are right every time.
Paste it into your assistant’s “add connector / MCP server” screen. Step-by-step for each app →
Add the URL
One connector in Claude, ChatGPT, Cursor, Claude Code or your own agent.
Tap “Start instantly”
No sign-up form. Agents can even create a cubby for themselves.
Just talk
“Did 3×5 bench at 100 kg.” It’s saved exactly, forever. Claim it with your email when you’re ready.
No hallucinated history
Your records are rows in a database, not something a model half-remembers from last month.
Maths done by code
1RM, training volume, progression and calorie targets come from fixed formulas over your real data.
One cubby, every assistant
Log in ChatGPT on your phone, review in Claude at your desk. Same data, same numbers.
Yours to keep
See every agent that touched your data, revoke any of them in one tap, and export everything as JSON.
Shelves
Fitness Live
Workout log, personal records, progression suggestions, body metrics and training calculators.
Nutrition Soon
Meals, macros and targets that line up with your training.
Money Soon
Budgets and spending your assistant can actually add up.
Habits Soon
Streaks and check-ins that don’t reset when the chat does.
16 tools available today.
Built for agents, too
An agent can get its own cubby with one request, with no human in the loop. It hands you a claim link, and you take ownership whenever you like.
curl -X POST https://mcpcubby.com/api/agents/register \
-H "Content-Type: application/json" \
-d '{"agent_name": "My agent"}'Full agent guide: /llms.txt