LangSmith

Managed LLM development platform offering tracing, datasets, testing, and evaluation.

Overview

LangSmith automatically captures LLM calls, agent steps, and tool invocations into structured traces. It provides a playground for prompt iteration, dataset management for continuous evaluation, and a feedback loop to align model behavior with business goals.

Best for

• LangChain/LangGraph projects
• prompt iteration
• continuous evals

Trade-offs

What XeroHack pre-wires

When you pick LangSmith in the interview, the engine emits these files into your scaffold:

• auto-tracing middleware
• dataset versioning
• evaluation templates (faithfulness, relevance)