Calculator Tools MCP for ChatGPT
tools.calculator/mcp
Publish a live calculator, tracker, tool, or game from Cursor, Claude, or ChatGPT.
client:ChatGPT
transport:streamable-http
Install Calculator Tools MCP in ChatGPT
Settings → Connectors → Advanced → Developer mode
https://api.calculator.tools/mcp/Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs