Source Claim Proof MCP Server

by workers-mattskowronis-source-claim-proof Your server? Claim it

answering

Source Claim Proof is answering right now. Last checked 8 min ago. It exposes 1 tools.

Verify whether a supplied public source currently supports one atomic factual claim.

Uptime history 59 days of history · worst day 90%

59 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

78 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Source Claim Proof 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 8 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add verify-source-claim --transport http https://source-claim-proof.mattskowronis.workers.dev/mcp

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

{
  "mcpServers": {
    "verify-source-claim": {
      "url": "https://source-claim-proof.mattskowronis.workers.dev/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.verify-source-claim]
url = "https://source-claim-proof.mattskowronis.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "verify-source-claim": {
      "url": "https://source-claim-proof.mattskowronis.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "verify-source-claim": {
      "url": "https://source-claim-proof.mattskowronis.workers.dev/mcp"
    }
  }
}

Available tools 1

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

verify

verify_source_claim

Verify one atomic factual claim against one public source URL. Return supported, contradicted, or insufficient-evidence with source snippets, or explicit blocked/unreachable/unsupported states. Not a general fact checker.

Endpoints

URL	Transport	State	Latency	Checked
https://source-claim-proof.mattskowronis.workers.dev/mcp	streamable-http	answering	76 ms	8 min ago

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Source Claim Proof — questions

Answers built from our own checks of this server.

What can Source Claim Proof do?

It exposes 1 tools, read directly from the server on our last check. Among them: verify_source_claim. 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 Source Claim Proof working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 78 ms. The bar chart above shows every period we have measured.

How do I connect Source Claim Proof?

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 Source Claim Proof need an API key?

No. Source Claim Proof completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Source Claim Proof?

It answers our handshake in 78 ms on average, which is faster than 89% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.