capabilities txt registry for Claude.ai

io.github.capabilityhostprotocol/capabilities-txt-registry

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

client:Claude.ai transport:streamable-http tools:3

Install capabilities txt registry in Claude.ai

Settings → Connectors → Add custom connector

https://capabilitiestxt.org/api/mcp

Claude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs

What Claude.ai can do once it is connected

discover_capabilities
list_sites
get_site

capabilities txt registry in other clients

Claude Code
Claude Desktop
Cursor
VS Code
Zed
Windsurf
Cline
Gemini CLI
Grok
ChatGPT
LangChain

capabilities txt registry MCP server