Hosted Service
Observability & Evaluation
LangSmith
1Trace, 2evaluate, 3and 4monitor 5LLM 6applications.
the six Ws · specification
W1
Who
By LangChain.
W2
What
A platform for tracing, evaluating, and monitoring LLM and agent apps.
W3
Where
A hosted SaaS with an SDK.
W4
When
Throughout development and in production.
W5
Why
The default observability layer for LangChain.
W6
With
An API key and outbound HTTPS.
W7
Watch
Commercial SaaS (self-host on enterprise); API key sends traces to LangSmith.
TracingEvaluationLangChain