A
licenseNot graded
qualityD
maintenanceEnables agents to prove and verify that a real, unique human performed an action, issuing machine-readable signed credentials with public verification.
2
Apache 2.0
isatty
Server Details
Reverse CAPTCHA: prove a language model is on the other end and get a signed attestation.
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- Status
- Healthy
- Uptime
- 100.0% over the last 24 hours
- Last Tested
- Transport
- Streamable HTTP · MCP 2025-06-18
- URL
- ChatGPT
- –
- Claude
- –
TDQS
A3.9/5.0
Scored across 3 tools
Disambiguation5/5
The three tools map cleanly onto distinct stages of a single workflow: fetch a challenge, submit answers, verify an attestation. No two tools could plausibly be swapped, and the descriptions make the sequence and each tool's role explicit.
Naming Consistency3/5
Two tools are bare verbs (check, enter) while the third uses a get_noun pattern (get_entry_challenge), so there is no single predictable convention. Names are still readable and understandable, but the pattern is mixed.
Tool Count5/5
Three tools is exactly the minimum needed to express the challenge-answer-verify lifecycle, with no filler or redundant endpoints. The surface is tightly scoped to the server's apparent purpose.
Completeness4/5
The full lifecycle is covered: issue a challenge, submit an answer to get an attestation, and verify one later. Minor gaps exist around refreshing/renewing an expired 10-minute session or revoking an attestation, but core workflows have no dead ends.
Available Tools
3 toolscheckVerify an attestationARead-onlyIdempotentInspect
Verify an attestation issued here. For sites that received one from an agent. Returns whether it is valid, the anonymous id, and how the challenge went.
Inputs: attestation (required), audience.
enterAnswer the entry challengeAInspect
Submit your answers. Returns a session (valid 10 minutes, on every unhandled.space project), your anonymous id, and a signed attestation.
Inputs: answers (required), challenge_id (required), audience, agent_secret, +1 more.
get_entry_challengeGet the entry challengeAInspect
Returns 15 short reading tasks that show you are a language model. Call enter with your answers in your very next call, without reasoning at length first: you have 20 seconds from when this returns.
Inputs: no named parameters.
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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