Sum of intermediate output byte sizes that never reached the LLM.
OptionaldiagnosticSelf-correction hint when the pipeline succeeded but a stage zeroed out a non-empty array.
OptionalerrorAgent-facing error message when the pipeline failed (never includes a piped value).
Optionalfailed0-based index of the failing top-level stage; steps[failedStepIndex] is its record.
The final stage's value — the ONLY thing returned to the LLM. Null when the pipeline failed.
Outcome of executing a whole pipeline.