Verifiability
The degree to which important errors can be detected before the output causes harm.
Definition
The degree to which important errors can be detected before the output causes harm.
Practical test
Can the important error be detected before harm, by a named check or reviewer using available evidence under realistic time and volume?
Example
A draft email is easy for its sender to verify; personalized advice may be impossible for its recipient to verify despite clear prose.
What to record
For verifiability to be operational rather than a reassuring label, record the failure to detect, required evidence, check or reviewer, timing, measured miss rate, and fallback. If those facts cannot be observed or tested, do not treat the term itself as evidence that the workflow is safe.