Capabilities Txt Registry MCP Server

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not responding

Capabilities Txt Registry is listed as active in the registry but did not answer our last check. It exposes 3 tools. Last commit 10 Sep 2026.

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

Uptime history 51 days of history · worst day 0%

51 days agonow

2.2%

Uptime 24h

2 of 90 checks

Tools

read from the server

880 ms

Response time

average over 24h

Stars

last commit 10 Sep 2026

Capabilities Txt Registry does not always answer

Over the last week it answered 0.6% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 15 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

~/Library/Application Support/Claude/claude_desktop_config.json

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

~/.codex/config.toml

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

.cursor/mcp.json

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

.vscode/mcp.json

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

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

discover

discover_capabilities

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.

site

get_site

Get the full list of capabilities a site declares, by domain.

sites

list_sites

List every site that publishes a conformant capabilities.txt, with its grade and capability count.

Endpoints

URL	Transport	State	Latency	Checked
https://capabilitiestxt.org/api/mcp	streamable-http	answering	52 ms	15 min ago

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Capabilities Txt Registry — questions

Answers built from our own checks of this server.

What can Capabilities Txt Registry do?

It exposes 3 tools, read directly from the server on our last check. Among them: discover_capabilities, get_site, list_sites. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Capabilities Txt Registry working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 2 of 90 checks got a reply (2.2%), average response time 880 ms. The bar chart above shows every period we have measured.

The registry lists Capabilities Txt Registry as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect Capabilities Txt Registry?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Capabilities Txt Registry need an API key?

No. Capabilities Txt Registry completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Capabilities Txt Registry?

It answers our handshake in 880 ms on average, which is faster than 13% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Capabilities Txt Registry open source?

We cannot say either way: written in TypeScript and 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.