Per-rule usage for the current ISO week (omitted when feature is disabled).
public Optional<Double> spendUsd()Per-rule usage for the current ISO week (omitted when feature is disabled). LLM-evaluator rules are initialized to 0; code-evaluator rules include trace counts only.
LangChainInvalidDataException: if the JSON field has an unexpected type (e.g. if the
server responded with an unexpected value).