Countersign MCP Server

by llpro-countersign Your server? Claim it

answering

Countersign is answering right now. Last checked 11 min ago. It exposes 3 tools.

Independent, signed check of AI work: math, quotes, sources, links, code. Public verifiable log.

Uptime history 43 hours of history

43 hours agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

529 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Countersign 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 countersign --transport http https://countersign.llpro.ai/mcp

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

https://countersign.llpro.ai/mcp

~/.codex/config.toml

[mcp_servers.countersign]
url = "https://countersign.llpro.ai/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "countersign": {
      "url": "https://countersign.llpro.ai/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "countersign": {
      "type": "http",
      "url": "https://countersign.llpro.ai/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.

countersign

countersign_log

Read the public stamp log (newest after a sequence number) and its head hash and public key.

countersign_stamp

Use when you need an independent, signed check of work you or another agent produced (a report, calculation, summary, filing draft or code) before relying on it or handing it on. Countersign re-computes arithmetic, looks up quotes and values in the cited sources, opens links and parses code, then returns a signed stamp (pass, fail or inconclusive) saying exactly what is wrong, with time and method. The stamp is kept in a public log. It never checks work it produced.

countersign_verify

Confirm a Countersign stamp is real: give a stamp id (and optionally the work, to confirm the stamp is for exactly that text). Returns whether it is in the public log and whether its hash and signature are valid.

Endpoints

URL	Transport	State	Latency	Checked
https://countersign.llpro.ai/mcp	streamable-http	answering	595 ms	11 min ago

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Countersign — questions

Answers built from our own checks of this server.

What can Countersign do?

It exposes 3 tools, read directly from the server on our last check. Among them: countersign_log, countersign_stamp, countersign_verify. 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 Countersign 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 529 ms. The bar chart above shows every period we have measured.

How do I connect Countersign?

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.

Does Countersign need an API key?

No. Countersign 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 Countersign?

It answers our handshake in 529 ms on average, which is faster than 22% 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.