Hierarchical Architecture and Its Failure Mode

Hierarchical is supervisor nested. Manager agents over sub-managers over workers. CrewAI `Process.hierarchical` is the textbook version: a `manager_llm` dynamically delegates tasks and validates outputs. The LangGraph equivalent is `create_supervisor(create_supervisor(...))`. It is the natural pattern when the task is a real org chart. It is also the pattern most likely to collapse into managerial looping — manager agents assign work poorly, misinterpret sub-outputs, or fail to reach consensus. Sequential often beats it.

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Prerequisites: Phase 16 · 05 (Supervisor Pattern)

#Problem

Once the supervisor pattern clicks, the natural next step is "what if the workers are themselves supervisors?" Teams have sub-teams; companies have departments of departments. Hierarchical architectures mirror that.

The issue: LLM managers are not the same as human managers. A human manager has stable priors about what their reports know. An LLM manager re-reasons the org every turn from whatever is in its context. Tiny drift in that context, and the whole tree misallocates work.

#Problem

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