Measuring LLM Systems
Agent observability & tracing
Lesson 4 of 5
A trace turns an opaque agent run into spans you can measure — latency, tokens, and cost per step.
What you'll learn
- Model an agent run as a trace of spans (think → tool → observe)
- Attribute latency, tokens, and cost to each step
- Explain why 2026 treats observability as table stakes
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Not sure yet? Try the free lesson first: Eval harnesses