Debug LangChain Agents with LangSmith CLI
Learn how to debug LangChain agents using the LangSmith CLI tool to trace execution, inspect intermediate steps, and identify errors in agent workflows
Developers debug LangChain agents directly from the terminal using LangSmith Fetch commands.
Installation:
Terminal Commands:
langsmith fetch <run_id>: Retrieves specific agent trace datalangsmith fetch --project <project_name>: Pulls all runs from a projectlangsmith fetch --filter "status:error": Filters failed executionslangsmith fetch --output json: Exports traces as JSON
Workflow Integration:
- Pipe output to
jqfor JSON parsing:langsmith fetch <run_id> | jq '.outputs' - Combine with
grepto search errors:langsmith fetch --filter "status:error" | grep "Exception"
Resources:
- Documentation: https://docs.smith.langchain.com
- CLI reference: https://github.com/langchain-ai/langsmith-sdk
This eliminates browser context-switching and enables scriptable debugging workflows for production agent issues.
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