Letter AI for ChatGPT

io.github.tractatus-ai/letter

Search and act on Letter AI sales enablement content, deals, and call recordings.

client:ChatGPT transport:streamable-http

Install Letter AI in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://api.letter.ai/v1/mcp

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