I was looking at the documentation for subgraphs. [image] Invoke a graph from a node - Subgraphs - Docs by LangChain Full example: different state schemas The referenced link contains an example snippet with a subgraph being invoked in the parent node. I w…

hi @sudokpr I reckon, you can build and compile a subgraph inside a node on every invocation, but it’s usually not the pattern LangGraph is optimized for. For your goal (only exposing a subset of agents to the LLM), it’s typically better to keep the graph topology static and make the router’s promp…

‘Compile’ really isn’t expensive (just constructs an in-mem python object) so I really wouldn’t be concerned.

Thank you for the detailed response, @pawel-twardziak Thank you as well for sharing your perspective, @wfh That’s very helpful advice, @pawel-twardziak , about reducing the context sent to the LLM while keeping the subgraph static. In our setup, the subgraph uses an internal library owned by ano…

Hi @sudokpr and @wfh as far as I can read correctly from the source code: A node function is always wrapped in a RunnableCallable RunnableCallable has a built‑in rule: if your function returns another Runnable, it immediately runs that runnable with the same input and returns its output Since Com…

Ya we designed the Runnable API to recurse in that way. It’s predates LangGraph as a library and is stable, but it’s less legible from a software design perspective so I don’t see any purpose in using it in the context of StateGraph

[image] pawel-twardziak: subgraphs=True Hi @wfh what about the subgraphs=True? Will it work as usual when a node returns a graph?

Dynamic subgraphs?

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pawel-twardziak December 24, 2025, 10:52am 7

Hi @wfh

what about the subgraphs=True? Will it work as usual when a node returns a graph?

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Dynamic subgraphs?

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