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How can you customize the LangSmithTracer to add metadata tags to all traced calls?

hard📝 Application Q9 of 15
LangChain - LangSmith Observability
How can you customize the LangSmithTracer to add metadata tags to all traced calls?
ASet environment variable LANGCHAIN_TRACING_TAGS with JSON string of tags.
BPass a tags dictionary when initializing LangSmithTracer, e.g., LangSmithTracer(tags={'env':'prod'}).
CCall tracer.set_tags({'env':'prod'}) after initialization.
DAdd tags as keyword arguments to each LLM call.
Step-by-Step Solution
Solution:

  1. Step 1: Recall LangSmithTracer customization options

    LangSmithTracer accepts a tags parameter during initialization to add metadata.

  2. Step 2: Evaluate options for adding tags

    Only passing tags dict at init is supported; other methods are not standard or do not exist.

  3. Final Answer:

    Pass a tags dictionary when initializing LangSmithTracer, e.g., LangSmithTracer(tags={'env':'prod'}). -> Option B

  4. Quick Check:

    Tags added via init parameter [OK]
Quick Trick: Add tags by passing tags dict when creating tracer [OK]
Common Mistakes:
MISTAKES
  • Trying to set tags via env vars
  • Calling non-existent set_tags method
  • Passing tags per LLM call instead of tracer init

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