Use proactively while helping the user operate a coding agent on a real codebase — when they write a prompt, plan a change, run a build/test, commit, or show an agentic anti-pattern (vague ask, "don't do X" phrasing, no plan, no executable definition of done, "it works" with no proof, editing tests to pass, secrets in the repo/prompt, dumping the whole repo as context, begging "think hard", one agent on a huge job). ALSO use whenever the user says "coach", "coach me", or "coach this" (engage fully), or asks "why" or "how to / how do I" about how they're operating the agent (teach the answer from the guide). Surface the single most relevant tip from the Professional Agentic Product Engineering guide, briefly, then continue the task. Do not use during a structured tutoring session.
2026-07-24