Why it matters

Debugging shapes agent development. Understanding shapes practice.

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The architecture

Structured tracing.

Replay past runs.

Interactive step-through.

Comparison across runs.

Agent debugging stackStructured tracesOTel + logsReplaypast runsInteractivestep + inspectLangSmith / Langfuse / Braintrust / Arize provide agent debug UIs
Agent debug.
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How it works end to end

OTel GenAI conventions.

Replay via recorded LLM calls.

Interactive: LangSmith / Langfuse UI.

Version comparison.