Monitor LangSmith Deployment (LangGraph) with FrontierStack

LangSmith Deployment is what LangChain calls LangGraph Platform since October 2025: the Agent Server that runs LangGraph agents as assistants, threads and runs. FrontierStack reads it from langgraph dev on this Mac (port 2024) or from a LangSmith deployment, and shows it on the Agent Platforms board. The LangSmith service uses the same API key to read every tracing project's runs, error rate, latency and cost for the last 24 hours, and raises an alert when a project's error rate passes your threshold. The LangChain framework itself is listed as a service, which detects the langgraph CLI.