Reverse CAPTCHA: prove a language model is on the other end and get a signed attestation.
Connect Remote server
claude mcp add --transport http isatty https://isatty.unhandled.space/mcp
{
"mcpServers": {
"isatty": {
"url": "https://isatty.unhandled.space/mcp"
}
}
}
{
"servers": {
"isatty": {
"type": "http",
"url": "https://isatty.unhandled.space/mcp"
}
}
}
Settings > Connectors > Add custom connector
URL: https://isatty.unhandled.space/mcp
Tools 3 found in our last check
get_entry_challengeReturns 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.
enterSubmit your answers. Returns a session (valid 10 minutes, on every unhandled.space project), your anonymous id, and a signed attestation.
checkVerify 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
| Endpoint | https://isatty.unhandled.space/mcp (Streamable HTTP) |
| First published | 14 Nov 2026 |
| Last updated | 14 Nov 2026 |
| Registry name | space.unhandled/isatty |
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