Updated 2026년 4월

Best Multi-Agent Framework for Hierarchical workflows

Hierarchical workflows put a supervisor agent in charge of delegating, reviewing, and composing the work of specialised workers. This is the right shape when the task has clear ownership boundaries and the supervisor needs to enforce a contract on the output. LangGraph, Google ADK, and CrewAI all support hierarchical orchestration; LangGraph and Google ADK lead on auditability.

Supervisorplans, delegates, reviewsWorker 1tool + LLMWorker 2tool + LLMWorker 3tool + LLMComposed answerSupervisor delegates and aggregates. Workers do not talk to each other.

Top 3 picks for hierarchical workflows

  1. #1
    LangGraph

    ×1.0 overhead

  2. #2
    Google Agent Development Kit

    ×1.2 overhead

  3. #3
    CrewAI

    ×1.3 overhead

Best fit inputs

Roles 5-10, state long-term, HITL configurable, observability compliance-grade.

Typical use cases

  • →Customer-support triage with a planner agent dispatching to billing, technical, and refund specialists.
  • →Research workflows where a coordinator delegates literature search, data extraction, and synthesis.
  • →Code-generation pipelines with a planner, generator, and reviewer trio.

Pitfalls

  • !Supervisor prompts grow unwieldy — extract them into versioned templates from day one.
  • !Worker agents can drift from contract; type-check or schema-validate every handoff.
  • !Supervisor becomes a single point of failure; instrument retries and idempotent workers.

FAQ

  1. How is hierarchical different from sequential?

    Sequential is a fixed chain. Hierarchical has a supervisor that decides which workers to invoke and in what order based on intermediate state.

  2. Can workers call other workers?

    In strict hierarchical, no — only the supervisor delegates. If workers need to talk, you have an adaptive workflow.

  3. How deep can the hierarchy go?

    Two levels (supervisor + workers) is the sweet spot. Three levels is doable but adds significant latency and cost.

  4. Which framework has the cleanest supervisor primitive?

    LangGraph supervisor patterns and Google ADK's hierarchical sub-agents are both first-class and well documented.

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