AgentTrace vs LangSmith
Runtime control vs Prompt engineering.
What LangSmith is good at
- Excellent for prompt engineering and evaluation.
- Great for tracing chains and visualizing LLM calls.
- Integrated tightly with the LangChain ecosystem.
This helps build trust — we know LangSmith is a great tool.
Where LangSmith stops working for runtime
- It's an observability tool, not a runtime execution layer.
- Cannot guarantee deterministic re-execution of code.
- Focuses on prompts/IO, not full program state.
- Doesn't provide a sandboxed rewind/replay environment.
The Core Difference
Dimension
AgentTrace
LangSmith
Determinism
Execution Control
Layer
Runtime
Observability
Focus
System State
Prompts & IO
When to use both
Use LangSmith to optimize your prompts and chains during development. Use AgentTrace to guarantee reliable execution and debug complex failures in production.