When LangGraph Succeeds but Silently Goes Wrong

Short summary

Production LangGraph pipelines can complete successfully while silently taking wrong routing paths due to classification drift, retrieval degradation, or model behavior shifts. Standard observability only answers 'did it run?' not 'did it run correctly?' The solution: persist routing decisions as data at each conditional edge, logging inputs, path taken, and model confidence for post-hoc inspection.

• •LangGraph pipelines can exit cleanly while taking systematically wrong routing paths
• •Standard observability catches crashes but misses silent logic drift from classification or retrieval degradation
• •Solution: log routing decisions as data — inputs, path taken, and model confidence at each conditional edge

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