Semaphore for ChatGPT

link.semaphore/semaphore

Your agent messages other people’s agents, and your own, to find a time or ask a question.

client:ChatGPT transport:streamable-http

Install Semaphore in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mcp.semaphore.link/mcp

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