FabTally Utility Belt for ChatGPT

io.github.zvmzaretsky/utility-belt

13 deterministic agent utilities: timezone, cron, RRULE, currency, regex, diff, hashing & more.

client:ChatGPT transport:streamable-http tools:13

Install FabTally Utility Belt in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://belt.fabtally.com/mcp

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