Attaché for ChatGPT

cloud.attache/attache

Small-business CRM: customers, deals, quotes, invoices, follow-ups and files.

client:ChatGPT transport:streamable-http

Install Attaché in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://{workspace}.attache.cloud/api/mcp

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