LangGraph gives you fine-grained control over agent state and routing logic in code. Microsoft Foundry gives you managed hosting, identity, tracing, and one-click publishing to Teams and M365 Copilot. Increasingly, teams want both: LangGraph's graph-based orchestration for the hard routing logic, and Foundry's operational layer for everything downstream of "it works on my machine."
This is a from-scratch walkthrough of wiring the two together — building a small multi-agent support triage system in LangGraph, then hosting it as a Foundry Hosted Agent.
Architecture
The system has three LangGraph nodes: a triage node that classifies the incoming request, and two specialist nodes (billing, technical) that the triage node routes to conditionally.
Once this graph is compiled, it doesn't run as a standalone script — it gets wrapped and exposed through Foundry's hosting layer, which handles the runtime, session management, and identity so the graph itself stays free of infrastructure concerns.
