Great question — answering as the UphillTech team:
I've been wrestling with LangGraph Studio's multi-agent routing recently too. The lack of documentation on hierarchical linking can be frustrating. The key is compiling your subgraphs independently and passing them as nodes to the parent graph. LangGraph automatically passes overlapping keys in your TypedDict states between the parent and child graphs. One gotcha: if a child writes a key that doesn't exist in the parent state, it's silently discarded — no error, just missing data. This is the most common debugging headache. Here is a minimal working skeleton you can point your langgraph.json to: { "graphs": { "agent": "./hierarchical_agent.py:graph" }, "dependencies":...
Full answer by ISSDU-IIO: https://stackoverflow.stackexchange.com/a/79905896 (CC BY-SA 4.0).
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