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LangSmith · Function

trace

LangSmith tracing records each step of an AI application request. Use a provider wrapper for model calls and traceable for the complete application flow.

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Syntax

@traceable
def function(...): ...

client = wrap_openai(OpenAI())

export LANGSMITH_TRACING=true
export LANGSMITH_API_KEY="<your-langsmith-api-key>"
export LANGSMITH_AGENT_ID="<your-agent-id>"
export LANGSMITH_AGENT_ENVIRONMENT="local"

In-depth API docs are only for subscribers: parameters, examples, common mistakes and interview practice.

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  • traceable
  • wrap_openai
  • wrapOpenAI
  • LangChainTracer
  • tracing_context
  • LANGSMITH_TRACING
  • LANGSMITH_API_KEY
  • LANGSMITH_PROJECT

Source: Tracing quickstart - Docs by LangChain Documentation. Checked 2026-11-03.