In 2026 there is exactly one production-grade agent stack: a model with tool use, three tools, and a cron job.
- One tool to read (web fetch, DB, API)
- One tool to think (the model itself)
- One tool to write (email, doc, ticket, message)
If your day-one architecture diagram has more than five boxes, you're scaling before you've shipped. The agents I've seen die in production all died of complexity, never of missing capability.
— Patrick