Decision GuideCategory landing: how to pick a testing level and where it should run.Jump to the level-picking, tiering, and failure-pattern pages below.In this sectionQuick Decision TableDecision table and flowchart mapping what changed to the minimum testing level required, plus a symptom-to-pattern lookup for a failure already in front of you.The Common AI Failure PatternHow AI agents fail by testing logic when the bug is visual.Execution TiersWhere and when a test runs -- the second axis, orthogonal to testing levels.Heavy Test Decision RuleWhat to do when an E2E test is too heavy for PR CI — fix, demote, or delete, then classify why it is heavy and assign the right tier.Required Testing BehaviorMandatory behaviors for AI agents when testing frontend code.Project Archetype PlaybookThe minimum viable test suite per repo type — pick an archetype, produce a concrete starting suite.NextQuick Decision TableRevision HistoryCreatedUpdated