Signal MCP Server

by returnonsecurity Your server? Claim it

answering

Signal is answering right now. Last checked 11 min ago.

Cybersecurity market intelligence: funding rounds, M&A, investors, valuations, corporate lineage.

Uptime history 71 days of history · worst day 91%

71 days agonow

100.0%

Uptime 24h

91 of 91 checks

—

Tools

hidden behind auth

242 ms

Response time

average over 24h

OAuth sign-in

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Signal 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 11 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add signal --transport http https://mcp.returnonsecurity.com/mcp

Settings → Connectors → Add custom connector, then paste this address

https://mcp.returnonsecurity.com/mcp

~/.codex/config.toml

[mcp_servers.signal]
url = "https://mcp.returnonsecurity.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "signal": {
      "url": "https://mcp.returnonsecurity.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "signal": {
      "type": "http",
      "url": "https://mcp.returnonsecurity.com/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.returnonsecurity.com/mcp	streamable-http	sign-in	226 ms	11 min ago

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Signal — questions

Answers built from our own checks of this server.

Why is there no tool list for Signal?

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 Signal 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 242 ms. The bar chart above shows every period we have measured.

How do I connect Signal?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.

How do you sign in to Signal?

No API key is involved. Signal answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.

How fast is Signal?

It answers our handshake in 242 ms on average, which is faster than 60% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.