“It fails in CI” is not a bug report yet

A debugging question about turning CI-only failures into reusable reports without writing a long essay.

A CI-only failure usually starts with the least useful sentence: “it works locally.” I get why people write it. It feels like the important fact. But the next useful line is the difference. Was the lockfile different? Was the cache warm? Was the command run from another directory? Was one secret missing? Did the runner use another minor version? For a small team, I would rather receive four boring lines than a paragraph of guesses. What is the shortest CI failure format that still helps the next person reproduce it?