Use when investigating a specific named Positron e2e (Playwright) test that is failing or flaking -- in CI ("why is <test> failing on main", "this test is flaky in CI", "is this a test bug or a product bug") or on the engineer's machine ("this e2e test just failed locally", "debug this e2e failure"). From CI it surfaces the test's distinct failure modes from history and pulls evidence for one; locally it reads the run's own trace, snapshot, and logs. Either way it reasons to a falsifiable root cause with the engineer and lands on a test fix, a product-bug issue, or an accepted-flake note. Do NOT use for a test you are writing or currently editing (author-e2e-tests); a whole CI run's failures, or a run ID/URL (e2e-failure-analyzer); Vitest or extension-host failures.