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LangSmith

Debug, test, and monitor your LLM apps — full trace visibility for every run.

0Free-Limited
AI Observability
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Overview

LangSmith is a platform for debugging, testing, evaluating, and monitoring LLM applications, built by the LangChain team to give full visibility into every chain and agent run.

Key Features

  • Full trace visualization for every LLM call and chain step
  • Dataset management for evaluation benchmarks
  • Automated evaluators with LLM-as-judge
  • Prompt versioning and A/B testing
  • Production monitoring with latency and error tracking
  • Human annotation workflows for labeling

Real-World Workflows

Debug a hallucinating RAG pipeline

  1. 1Add LANGSMITH_API_KEY to your environment
  2. 2Run your LangChain app — traces appear automatically
  3. 3Open the trace to see each retrieval chunk and LLM prompt
  4. 4Identify where irrelevant context is causing hallucinations and fix the retriever

Getting Started

pip install langsmith

export LANGCHAIN_TRACING_V2=true
export LANGCHAIN_API_KEY=ls__your_key

# That's it — all LangChain calls are now traced
# View traces at https://smith.langchain.com

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