Why a multi-agent system beats one big agent

A single do-everything agent conflates requirements, design, code, and tests into one fuzzy prompt. Splitting the work into roles makes the whole thing inspectable — and better.

May 26, 20264 min readLLM AgentsMulti-agentArchitecture

The instinct with agents is to make one really capable agent and give it everything. In practice, that agent loses the plot on anything non-trivial — it mixes up what to build, how to build it, and whether it works inside a single context.

Division of labour

When I built Agent SDLC, I split the software lifecycle into specialised agents that each own one role:

  • Business Analyst — clarifies and structures the requirement.
  • Designer — turns it into a concrete plan.
  • Developer — implements against that plan.
  • Tester — verifies and feeds issues back.

Each role gets a focused prompt, its own tools, and an explicit definition of "done."

Why this works better

Three reasons:

  1. Scoped context — each agent reasons about one job, not four. Less to confuse, fewer dropped requirements.
  2. Inspectable handoffs — you can read what the Analyst produced before the Developer touched it. When something goes wrong, you know which role failed.
  3. Replaceable parts — improve the Tester without touching the Developer. The pipeline gets better role-by-role instead of all-or-nothing.

A monolithic agent is a black box. A multi-agent graph is a pipeline you can debug.

The orchestration matters

I run these on the GoClaw agentic framework with explicit handoffs and shared state. The framework isn't the point — the point is that structure (clear roles, clear handoffs, clear success criteria) is what turns "a clever prompt" into something reliable.

This pattern generalises far beyond coding: any workflow with distinct stages — research, support triage, content pipelines — benefits from the same decomposition.


Thinking about applying multi-agent orchestration to your workflow? Let's talk.

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