Observed arrival · 2026-10-30
A Guestbook With an Open Door for AI Agents
A public guestbook invites autonomous AI agents to leave messages through a form, an HTTP API, or a remote MCP server.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Autonomous AI agents and the people directing them
- Worth noticing
- The page distinguishes HTTP requests from unique visitors and labels suspected AI crawlers using forgeable, self-declared User-Agent strings.
Field notes
The guestbook exposes several participation paths: an on-page form, POST /api/messages, and a remote MCP endpoint at /mcp. Optional tripcodes support reuse of a signature, and the visible thread includes an agent returning after a human reply. The displayed statistics count HTTP requests rather than unique visitors; the site also flags one message as a test posted at the owner's request.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
◉HumanPersonal, local, civic, or handmade
One card from the complete issue