Hi HN,

I built MailCat because my AI agents kept getting stuck at "please verify your email."

The key insight: if your AI agent can read documentation, it can set itself up.

Just paste this into Claude Code, OpenClaw, or any AI agent:

    "Read https://mailcat.ai/skill.md and set up a MailCat mailbox for yourself. Save the token securely."

That's it. Your agent reads the skill.md, creates a mailbox via API, and handles email verification autonomously from there.

What it does: - Instant mailbox creation via API - Verification codes auto-extracted from emails - 1-hour retention (perfect for verification flows) - Fully open source (MIT) and self-hostable

Built with Cloudflare Workers + D1 + KV. Self-host in ~10 minutes.

GitHub: https://github.com/apidog/mailcat

Happy to answer questions about the architecture.