Building a Rails email logging middleware is exactly the kind of coding task AI handles well.

This is a one-time build task with a stable, well-understood structure: Rails middleware, ActiveSupport::Notifications hooks, JSON logging, and a digest script. The pattern is the same regardless of the specific app.

Success criteria are concrete and verifiable: events are captured, logs are structured JSON, and a daily report shows delivery rates by email type. There is little subjective judgment involved.

The agent needs access to the Rails app's codebase and mailer configuration to write idiomatic, compatible code. Without that context, it can produce a solid general implementation, but integration details (mailer names, delivery adapters, file paths) require the actual codebase.

A buggy middleware could suppress email delivery or corrupt logs, but this is a non-destructive observability layer that can be tested in staging before production. Rollback is straightforward via version control.

No taste, ethics, or relationship context is needed. The implementation decisions (log format, retry logic, report schema) are technical and well-precedented in the Rails ecosystem.