A useful work unit begins with a qualified request and ends with an accepted, refused, or abandoned disposition. Cost can include model calls, retrieval, storage, tools, retries, human review, and exception handling. Value may concern cycle time, quality, risk reduction, revenue influence, or capacity released. The selected metric must match the objective and avoid claiming cash impact when only intermediate workflow evidence exists.
Track forecast and actual separately. Before execution, record expected route, cost range, quality risk, and value hypothesis. Afterward, reconcile provider and internal usage, review time, outcome, and error state. Variance can then inform routing, caching, budget, package, and workflow changes. Without this comparison, usage growth can appear successful while margin or operating load deteriorates unnoticed.