Skip to content
Screwtape logo

Screwtape MCP server

Which MCP servers are Screwtape's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-27

← Back to Screwtape

Whose server it is
  • Registry nameai.screwtape/screwtapeverified in the MCP registry

The registry name sits under screwtape.ai. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-27
  • Stateanswerschecked 2026-10-27
  • Tools6
  • Server calls itselfScrewtape.ai
  • Server version1.2.0
  • Protocol version2025-06-18

On 2026-10-27 the server answered initialize and tools/list without a sign-in. First answer in 301 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.

Once connected

  • For "Flag duplicate invoices resent under a new number", the likely first call is check_duplicate_invoice.
  • publish_receipt change data without a sign-in: anyone with the address can call them.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 8, the first on 2026-10-28
  • INITE MCP score68 of 100answers 100 · definitions 100 · context 84 · use 0 · connects 100 · lowered by the warning signs below
  • Answered100% of days8 of 8 daily checks
  • Median first answer375 ms
  • Space in an agent's context≈ 5,455 tokensthe definitions of all its tools (6), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results6 of 6 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • not sure · Check invoice amounts and totals against purchase orders before payment
  • can do · Flag duplicate invoices resent under a new number
  • not sure · Export signed receipts of payment decisions for auditor review

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

  • Tools that change data, on a server that answers without a sign-in: publish_receipt

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers6 tools · read 2026-10-27
  • 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…

  • 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…

  • 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…

  • get_api_key

    Create a free Screwtape.ai API key (10 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…

  • buy_pack

    Retired. No prepaid pack is sold to agents any more (Starter and Builder were retired), so this tool always returns the error pack_retired with how a person buys the Sandbox Evaluation Pack by card. It does not move funds and needs no…

  • 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…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "screwtape": {
      "type": "http",
      "url": "https://screwtape.ai/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http screwtape https://screwtape.ai/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://screwtape.ai/mcp as a custom connector in the settings.

OpenAPI spec

37 paths, read 2026-10-27. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.