Agentic workflows that operate without logging create accountability gaps: when an error occurs, there is no way to trace which agent made which decision, on what inputs, to produce what output. Comprehensive decision logging is not optional overhead — it is the audit trail that enables quality improvement, error attribution, and regulatory compliance.
What to Log
For every agent action: Input (what data or text the agent received), Decision (what action the agent took or recommended), Reasoning (why the agent made that decision — LLM reasoning traces), Output (what text or data the agent produced), Timestamp (when the decision was made), Human action (what the human reviewer did with the agent's output: approved, rejected, modified, ignored). Store logs in a queryable format (database, not flat files) for error pattern analysis. Retain logs for at least 12 months for post-publication review.