MCP server

Capabilities Txt Registry

io.github.capabilityhostprotocol/capabilities-txt-registry

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Website Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

3

Token cost

About 302 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.capabilities-txt-registry]
url = "https://capabilitiestxt.org/api/mcp"

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"capabilities-txt-registry":{"type":"http","url":"https://capabilitiestxt.org/api/mcp"}}}

Antigravity

agy mcp add capabilities-txt-registry https://capabilitiestxt.org/api/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"capabilities-txt-registry","server_url":"https://capabilitiestxt.org/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"capabilities-txt-registry","server_url":"https://capabilitiestxt.org/api/mcp"}

Tools

• discover_capabilities ~151 tokens
  Search the capabilities.txt registry for sites that can do something — by capability id, keyword, or category. Returns matching capabilities with the site that offers them and its conformance grade. To invoke, fetch that site's /capabilities.txt.
• get_site ~83 tokens
  Get the full list of capabilities a site declares, by domain.
• list_sites ~68 tokens
  List every site that publishes a conformant capabilities.txt, with its grade and capability count.

Browse

• GitHub tools
• GitHub and code hosting

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