Reckon for ChatGPT

software.reckon/reckon

The commercial record your coding agent works from — deterministic pricing with full provenance

client:ChatGPT transport:streamable-http

Install Reckon in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://www.reckon.software/api/mcp

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