capabilities txt registry for ChatGPT

io.github.capabilityhostprotocol/capabilities-txt-registry

Discover what websites across the agentic web can do — query the capabilities.txt registry.

client:ChatGPT transport:streamable-http tools:3

Install capabilities txt registry in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://capabilitiestxt.org/api/mcp

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