Screwtape.ai MCP Server

About Screwtape.ai

Verify before the agent pays. An independent judge for your agents. Screwtape isn't tied to any agent framework or AI model provider, so its verdicts are never grading their own work. Every verdict comes with a signed receipt you can verify yourself, which gives you a record you can trust when it matters.

Tools: judge (pass, fail or retry verdict on one agent output, with reasons and a next step), check_duplicate_invoice (before an agent pays, flags duplicate or possible-duplicate invoices for a person; opt-in, stores only keyed fingerprints, needs a free API key), consensus (scores agreement across 2 to 16 agent answers and flags false-consensus risk), get_api_key, buy_pack, publish_receipt.

Auth and pricing: free API key (100 calls per UTC day), or $0.005 USDC per call with x402 on Base or Solana, no key needed. Transport: streamable HTTP at https://screwtape.ai/mcp. Docs: https://screwtape.ai/docs/

Screwtape.ai tools (6)

Read from the live server on Oct 26, 2026. These are the tools your AI assistant can call once connected.

judge

An independent pass/fail/retry verdict on ONE agent output. Call it before you return, store or act on a draft answer, especially when you have the evidence the answer should be based on. Do NOT call it to look up facts (it does no web sear

check_duplicate_invoice

Duplicate invoice check before an agent pays. Same as judge with one duplicate check: it compares this invoice with the invoices this API key recorded earlier and also judges it. Call it before an agent pays or approves an invoice or paymen

consensus

False-consensus check for 2 to 16 answers to the same task. It scores how the answers agree and flags agreement that looks copied or too thin to trust. Screwtape is not tied to the agent framework or the model that wrote the answers. Call i

get_api_key

Create a free Screwtape.ai API key (100 calls per UTC day) with no human approval. Call it only when no Screwtape key is configured and you can compute SHA-256 with a code tool, because the proof of work must be computed exactly, not guesse

buy_pack

Return the x402 payment requirements for a Starter ($40, 10000 calls) or Builder ($175, 50000 calls) prepaid pack, plus how to pay with USDC on Base or Solana. pack is starter or builder. This call does not move funds and does not require a

publish_receipt

Publish a signed receipt you own so a public page and a Screwtape Verified badge can link to that one verdict. Call it when you want to show that a specific output received a specific verdict. Do NOT call it to certify an agent in general:

How to connect Screwtape.ai to Claude, Cursor or VS Code

Screwtape.ai runs as a hosted remote MCP server at https://screwtape.ai/mcp. Add that URL to your MCP client's config (Claude Code, Cursor, Windsurf or VS Code) and the tools appear immediately, no install required.

{
  "mcpServers": {
    "screwtape-ai": {
      "url": "https://screwtape.ai/mcp"
    }
  }
}

Claude Code: claude mcp add --transport http screwtape-ai https://screwtape.ai/mcp. Servers that require OAuth or an API key will prompt on first use.