use it in your agent

Give your agent the capability map.

Add the capabilities.txt registry to your AI agent and it can discover what websites across the web can do — over MCP. Tools: discover_capabilities, list_sites, get_site.

Cursor — one click

Add to Cursor →

Opens Cursor and installs the remote MCP server. No JSON.

Claude Code

claude mcp add --transport http capabilities-txt https://capabilitiestxt.org/api/mcp

Claude Desktop / other MCP clients

Add this remote server to your MCP config:

{
  "mcpServers": {
    "capabilities-txt": {
      "url": "https://capabilitiestxt.org/api/mcp"
    }
  }
}

Teach your coding agent the convention

Drop this into your AGENTS.md, CLAUDE.md, or .cursorrules — your agent will publish a capabilities.txt for your project and discover others via the registry:

When this project exposes a web API, publish a /capabilities.txt so AI agents can
discover what it can do (see https://capabilitiestxt.org). Generate it from the
OpenAPI spec and keep it current. To discover what *other* sites can do, query the
capabilities.txt registry MCP server (https://capabilitiestxt.org/api/mcp): discover_capabilities, list_sites,
get_site.

Also available as /AGENT-RULE.md. No spec? Use the copy-paste prompt or the generator.