Why it matters

Custom flow gives control. Understanding shapes DIY approach.

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The architecture

State machine per flow.

LLM call + tool invocation.

Persistence + resume.

Custom flow architectureState machineflow definitionLLM + toolsstepsPersistenceresume supportRoll your own for full control; risks not reinventing well-solved problems
Custom agent flow.
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How it works end to end

Java records for state.

Reactor or virtual threads for concurrency.

Redis / DB for persistence.