Black Flag Alert MCP Server

by blackflagalert Your server? Claim it

answering

Black Flag Alert is answering right now. Last checked 4 min ago. Last commit 3 Oct 2026.

UK company credit risk for England & Wales: R-Score, CCJs, charges, financials. 5.1M companies.

Uptime history 14 days of history · worst day 97%

14 days agonow

98.9%

Uptime 24h

91 of 92 checks

—

Tools

hidden behind auth

409 ms

Response time

average over 24h

Stars

last commit 3 Oct 2026

Black Flag Alert does not always answer

Over the last week it answered 99.2% 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 4 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mcp --transport http https://blackflagalert.com/api/mcp

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

{
  "mcpServers": {
    "mcp": {
      "url": "https://blackflagalert.com/api/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.mcp]
url = "https://blackflagalert.com/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://blackflagalert.com/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://blackflagalert.com/api/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, but it did not say what kind of credentials it expects.

Endpoints

URL	Transport	State	Latency	Checked
https://blackflagalert.com/api/mcp	streamable-http	needs auth	418 ms	4 min ago

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Black Flag Alert — questions

Answers built from our own checks of this server.

Why is there no tool list for Black Flag Alert?

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: 98.9% of checks in the last 24 hours got a reply.

Is Black Flag Alert working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 92 checks got a reply (98.9%), average response time 409 ms. The bar chart above shows every period we have measured.

How do I connect Black Flag Alert?

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 credentials: it refuses anonymous clients.

Does Black Flag Alert need an API key?

Yes. Every time we knock, Black Flag Alert 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 Black Flag Alert?

It answers our handshake in 409 ms on average, which is faster than 30% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Black Flag Alert open source?

Yes — it is published under the MIT licence, written in Python and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.