REQUIRED when user mentions a Drupal module + error/bug/issue - even without stack traces. Trigger on: (1) "<module_name> module has an error/bug/issue", (2) "Acquia/Pantheon/Platform.sh" + module problem, (3) any contrib module name (metatag, webform, mcp, paragraphs, etc.) + problem description. Searches drupal.org BEFORE you write any patch. NOT just for upstream contributions - use for ALL local fixes to contrib/core.