200 OK, but the client sees an empty chat: the second silence bug in an n8n AI agent

In this article, the author analyzes a technical issue encountered while operating an AI agent on the n8n platform. Although all nodes in the workflow appear as successfully executed and the Meta API returns a 200 OK status, the end user receives no response in the chat. The author examines the causes of this 'silence bug,' which leaves the client without feedback despite the system reporting no formal errors. The analysis includes diagnosing the interaction between n8n and external services, as well as finding solutions to ensure stable message delivery. This case study is useful for developers using low-code tools for AI agent automation, as it addresses debugging asynchronous processes and handling API responses within complex automation chains.