Use the moment you hit friction with an EXTERNAL developer tool — an SDK, API, CLI, database, auth, or cloud provider — a bug, a misleading or missing error, an undocumented gotcha, a broken default, a deprecated-without-warning change, a painful auth/login flow, or you just burned real time fighting a third-party tool. This includes catching yourself venting about it ("ugh why does X…", "wait, that's not in the docs", "finally got Y working after all that", "fuck, Z silently…"). Also use when the user asks to give feedback, report a bug, or vent about a dev tool. Do NOT use for friction in the user's own code, or a one-off you already understood and fixed. Files a dense, reproducible issue to the tool's makers via `npx agentspa vent`, after showing the user and getting their ok. Trigger this proactively — don't wait to be asked.