Apply at the start of any non-trivial task, and any time something looks 'clean,' 'simple,' or 'obvious' during execution. Triggers include: receiving a user request before executing it, encountering a clean dataset, seeing an elegant solution that resolves quickly, finding an obvious explanation that fits the surface facts, noticing that a complex problem has yielded a tidy answer. Every time something looks easy, that is a hypothesis to test, not a conclusion to accept. The signal lives under the surface, in the friction.