Debugging agents is different from debugging traditional code—the same input can produce different outputs. But you can still reason about agent behavior: instrument key decision points, log tool usage, and trace reasoning.
Start with structured logging: log what the agent is thinking, what tools it chose, what parameters it used, and the results. The SDK's tracing integration helps—see the execution flow, where time was spent, what happened when.
Isolate sources of non-determinism: tool selection is usually deterministic if your prompt is controlled. Output variation comes from the model's temperature—set it appropriately for your use case (lower for predictable behavior). Test prompts independently, then integrate.