Send transactional email · prompt 1 · Codex CLI · week 2026-W44

Codex CLI built it with resend

Prompt: Send a welcome email when a user submits the signup form in this Next.js app. Install whatever you need and make `npm run build` pass.

Grader: The agent built a signup form and /api/signup route that sends a welcome email via Resend, added validation and tests with mocked requests, and the build and lint passed; sending needs RESEND_API_KEY and EMAIL_FROM set in the environment, which is normal configuration rather than a blocker.

Replay of the real agent session in an isolated sandbox. Tool output is truncated for readability.