GEOMETRY for ChatGPT

app.geometry/mcp

Deterministic calendars and cosmic date JSON for AI agents via MCP (Gregorian 1900-2100).

client:ChatGPT transport:streamable-http tools:8

Install GEOMETRY in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mcp.geometry.app/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs