Based on the recent leaks, their system prompt explicitly nudges the model not to do anything outside of what was asked. That could very well explain why it’s not fixing preexisting broken tests.
“Don't add features, refactor code, or make "improvements" beyond what was asked.”
“Don't add features, refactor code, or make "improvements" beyond what was asked.”
https://www.dbreunig.com/2026/04/04/how-claude-code-builds-a...