Three Tools, Three Layers: Sentry, Langfuse, and LangGraph for Multi-Agent Fleets

Multi-agent systems need three layers of visibility. System health, run quality, and workflow state. We run a stack of Sentry, Langfuse, and LangGraph for that. Three tools, three clearly separated jobs, none can solve the problem of the others. Here is how it plays together at our place and why exactly this combination. Multi-agent systems have a property that everyone underestimates the first time they see one in production. A single LLM call is transparent. You put a prompt in, you get an ans