LangChain - LangSmith Observability
You added a callback to your LangChain app but no logs appear when running the chain. What is the most likely cause?
You added a callback to your LangChain app but no logs appear when running the chain. What is the most likely cause?
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Check callback implementation
If the callback class lacks event methods like on_llm_start, no logs will be triggered.Step 2: Verify callback registration
Even if callbacks are registered correctly, without event methods, no output occurs.Final Answer:
The callback class does not implement any event methods like on_llm_start. -> Option CQuick Check:
Callbacks need event methods to log [OK]
Quick Trick: Callbacks must implement event methods to produce logs [OK]
Common Mistakes:
MISTAKES- Assuming single object instead of list stops logs
- Blaming internet connection for no logs
- Thinking empty prompt causes no callback logs
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