Designing for Agents — Zeno Rocha, Resend (1:25:52)
Latent Space interviews Resend co-founder and CEO Zeno Rocha for 1:25:52, on how agents pick an email API, MCP server design, and writing for machines.
Key points Tap a time to jump
Cold open: a coding agent opens a pull request and picks an email provider
From the Dracula editor theme, launched in 2013, to building an email service
How agents pick an API: Claude Code picked Resend first in 64 of 102 extractable email recommendations
What tracking measures: the limits of click tracking and open rates
Paying for trust: custom tracking domains, the free tier, and anti-abuse
React Email's wedge: email templates first, then the sending API
Designing the MCP: the server grew from around 20 tools to more than 80
Mail for agents: reading pricing in Markdown and registering for a service on its own
Writing for machines: adding .md to the pricing page so an agent reads the table in one request
Winning recommendations: how the recommendation study differs across models
Comments
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