{
  "approach": "Check how diff.external affects git diff invocation and add `--no-ext-diff` flag when external is set to ensure diffs work correctly with external diff tools configured.",
  "files_to_edit": [
    "git/diff.py"
  ],
  "finish_reason": "stop",
  "hypothesis": "When diff.external is configured, the code attempts to run `git diff` externally without `--no-ext-diff`, causing the diff to silently return empty results when comparing index/working tree since git treats external diff tools as requiring `--no-ext-diff`.",
  "retries": {},
  "usage": {
    "completion": 113,
    "prompt": 9597,
    "reasoning": 0
  }
}