r/AI_Agents: Switching From Ollama to Anthropic SDK Broke a System — The LLM Didn't Change the Code; It Changed the Timing

A builder in r/AI_Agents documents that migrating a shared decision-log agent from local Ollama inference to the Anthropic cloud API broke a system that had worked fine — not because model behavior changed but because API round-trip latency altered the timing of agent state transitions. The post identifies infrastructure latency as a hidden failure mode in agentic systems: behaviors that are stable under local inference can be structurally fragile when the latency profile changes. The pattern is likely common among teams that prototype locally and deploy to cloud APIs.