Stop Prompting — Greg Pstrucha, Sentry

You correct your agent. It says "You're absolutely right." Five minutes later, after compaction, it makes the same mistake again.

Greg Pstrucha, who works on the infrastructure behind Seer, Sentry's debugging agent, argues you should stop re-prompting your coding agent and start codifying the rules you keep repeating. Agents have no memory, so the same elementary mistakes come back: overly defensive code, useless tests, endpoints nobody needs. Tests, strict types and especially linters turn those corrections into deterministic checks, and with agents, writing a custom lint rule is now cheap. He shows real examples from Sentry: lint rules that keep endpoints in sync with the OpenAPI schema, and a long game of whack-a-mole to keep agent skills accurate. For qualitative judgment, he uses written policies and a "Grumpy Engineer" review loop, and warns that agents will game any number you hand them, like test coverage.

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