CompanyStack MCP Server

by co-companystack Your server? Claim it

answering

CompanyStack is answering right now. Last checked 15 min ago.

UK company data from Companies House: search, officers, PSCs, filings, financials, KYB checks.

Uptime history 25 hours of history

25 hours agonow

100.0%

Uptime 24h

91 of 91 checks

—

Tools

hidden behind auth

282 ms

Response time

average over 24h

API key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check CompanyStack every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

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 mcp --transport http https://api.companystack.co.uk/mcp

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

{
  "mcpServers": {
    "mcp": {
      "url": "https://api.companystack.co.uk/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.mcp]
url = "https://api.companystack.co.uk/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://api.companystack.co.uk/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://api.companystack.co.uk/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, but you need an API key from its owner to call it.

Endpoints

URL	Transport	State	Latency	Checked
https://api.companystack.co.uk/mcp	streamable-http	needs key	331 ms	15 min ago

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CompanyStack — questions

Answers built from our own checks of this server.

Why is there no tool list for CompanyStack?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is CompanyStack working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 282 ms. The bar chart above shows every period we have measured.

How do I connect CompanyStack?

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. You will need your own key: it refuses anonymous clients.

Does CompanyStack need an API key?

Yes. Every time we knock, CompanyStack answers with an authorization challenge instead of its tool list — that is how we know it is running and gated rather than broken. Bring your own credentials and it will talk.

How fast is CompanyStack?

It answers our handshake in 282 ms on average, which is faster than 50% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.