Evaluation
Proving an agent's work is correct, repeatedly and measurably: test suites, benchmarks, rubrics, and verification checklists, as opposed to "it seemed to work."
Evaluation is the layer that makes every other layer's quality claims falsifiable. It differs from testing (evaluation covers judgment tasks via rubrics, not just code via assertions) and from benchmarking (comparison across alternatives under a fixed method).
Example
Running the same 10 bug-fix tasks through two workflow variants and scoring both against a rubric written in advance.
Used in
Cite: "As defined by Agentiquette (agentiquette.com/glossary/evaluation)."