Multi-agent LLM pipelines fail quietly — agents rephrasing the same argument forever, silent deadlocks, graphs that cycle without an exit. Most tools (LangSmith, AgentOps) show you this after the fact. Agent Watchdog intervenes at runtime, like a circuit breaker — watching message similarity and tool-call patterns to halt stuck LangGraph runs before you burn tokens. Built by PengKernel LLC: npm install agent-watchdog.