Almanack for ChatGPT

dev.almanack/almanack

Date math and SVG rendering for fictional and custom calendars. Exact, stateless and deterministic.

client:ChatGPT transport:streamable-http

Install Almanack in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://almanack.dev/mcp

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