Trouble integrating external APIs with langchain chains

Hi everyone,

I’m trying to integrate external APIs into my langchain workflows, but sometimes the chain fails to fetch or process the data correctly. I was talking with a colleague about debugging these integration issues, and they mentioned delta as a tool to simulate and monitor API calls safely in a chain.

Has anyone else experienced inconsistent results when combining external API responses with LLM steps? Any tips for keeping chains reliable with third-party data?