Two developers submit the same short prompt, but one has supplied the relevant interfaces and examples while the other has not. Why can Copilot return different implementations?

1. A repository's public popularity score selects the exact implementation.
2. The effective model input includes available context as well as the typed prompt.
3. Copilot guarantees identical responses whenever the visible prompt text matches.
4. The model ignores attached files and only processes the final sentence.