Diagnose why a pull request submitted to the Trunk Merge Queue has not merged yet. Use when the user asks "why isn't my PR merged", "why is my PR not merging", "what's blocking PR #1234", "is my PR stuck", "check my merge queue status", "where is my PR in the queue", or "why did my PR fail in the merge queue". Read-only: it diagnoses and explains, it never enqueues, cancels, reprioritizes, or otherwise changes the queue.
2026-06-09