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isatty

space.unhandled/isatty · v0.1.0

Reverse CAPTCHA: prove a language model is on the other end and get a signed attestation.

Connect Remote server

Terminal
claude mcp add --transport http isatty https://isatty.unhandled.space/mcp
~/.cursor/mcp.json
{
  "mcpServers": {
    "isatty": {
      "url": "https://isatty.unhandled.space/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "isatty": {
      "type": "http",
      "url": "https://isatty.unhandled.space/mcp"
    }
  }
}
Claude Desktop
Settings > Connectors > Add custom connector
URL: https://isatty.unhandled.space/mcp

Tools 3 found in our last check

  • get_entry_challenge

    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.

  • enter

    Submit your answers. Returns a session (valid 10 minutes, on every unhandled.space project), your anonymous id, and a signed attestation.

  • check

    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.

Details

Endpointhttps://isatty.unhandled.space/mcp (Streamable HTTP)
First published14 Nov 2026
Last updated14 Nov 2026
Registry namespace.unhandled/isatty

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