Exit Codes

Code	Meaning
0	Success
1	Validation or user-code failure (fmt --check found unformatted files, metrics thresholds or hotspot score thresholds were exceeded, etc.)
2	CLI argument or configuration error (including invalid wait combinations, metrics thresholds/exclusions, and hotspot selectors)
3	Operational or environment failure (including workbook busy, wait, and recovery outcomes)

diff returns 0 when differences are found. Inspect diff.summary.total_diffs in JSON.