PropoBox for ChatGPT

com.propobox/propobox

Create, send, track and follow up on client proposals from Claude. Flat-price proposal software.

client:ChatGPT transport:streamable-http

Install PropoBox in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://www.propobox.com/api/mcp

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