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Mastering Multi-Agent Systems: How to Build Reliable Sub-Agent Pipelines

A practical guide to designing sub-agent pipelines: choose the right control pattern, parallelize independent work, and make the coordinator responsible for review and synthesis.

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A reliable sub-agent pipeline starts with a clear outcome, divides the work into bounded tasks, and gives each task only the control flow it needs. Keep a manager in charge when one agent must synthesize results for the user; use a handoff when a specialist should take over; and use application code to make known sequences and checks predictable. Run tasks in parallel only when they are genuinely independent, then validate the results before using them.

When does a multi-agent pipeline make sense?

Use multiple agents when a task can be divided into distinct responsibilities—such as research, drafting, and evaluation—and the benefits of specialization or parallel work outweigh the extra coordination. A multi-agent design is not automatically better than one agent. If the work is a single ordered chain, requires frequent shared-state updates, or is dominated by one slow operation, adding agents may add overhead without removing the bottleneck.

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Parallel work is most useful when subtasks can proceed independently, have clear boundaries, and do not need to continually exchange intermediate state. OpenAI’s multi-agent guidance describes subagents as working in their own contexts while a main agent coordinates and combines their outputs. Anthropic’s account of its research system identifies broad research, work that exceeds one context window, and complex tool use as favorable cases; it identifies shared-context needs and many inter-agent dependencies as poor fits.

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Choose who owns the next decision

The key distinction between a manager and a handoff is control, not whether specialists exist. A manager can call specialists while retaining the conversation and responsibility for the final response. A handoff routes the turn to a specialist, who becomes the active agent for the remainder of that turn according to the OpenAI Agents SDK documentation.

Pattern Who controls the workflow? Best fit What to watch
Manager calling agents as tools The manager retains execution and user access, and combines specialist outputs (OpenAI practical guide and Agents SDK documentation). Bounded specialist contributions when one agent must synthesize the answer or enforce shared orchestration policies. The manager must resolve conflicts, check the outputs, and own the user-facing result.
Handoff Control transfers to the routed specialist for the remainder of the turn (OpenAI Agents SDK documentation). A workflow branch where a specialist should own the next response or decision. Make the transfer of responsibility explicit; do not assume the original manager will resume control automatically.
Code-controlled orchestration Application code determines ordering, routing, chaining, and checks (OpenAI Agents SDK documentation). Known sequences, structured routing, and workflows where predictable execution matters. Code makes the defined flow more deterministic, but the application still needs to handle model outputs and failures.

These patterns can be combined. A manager may delegate one part of a workflow through a handoff, or a specialist may itself call narrower agents as tools. Choose the arrangement based on who should make the next decision and who must deliver the final result.

Match the pipeline shape to the dependencies

Sequential transformations

Use a sequence when each stage needs the previous stage’s output. For example, a writing workflow might move from research to outline, draft, critique, and revision. Code can enforce that order and pass each result to the next stage. Running dependent stages at once does not remove the dependency; it merely leaves later work without the necessary input.

Parallel fan-out

Use parallel delegation for independent subtasks that can be combined later—for example, separate research questions with distinct scopes. Give each subagent its own task boundary and expected output, then have the coordinator reconcile overlaps, gaps, and disagreements. Parallel execution can reduce waiting on independent work, but synthesis remains necessary.

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Evaluator loops

Use a review loop when a result can be checked against explicit acceptance criteria. A generator produces an output, an evaluator identifies criterion-level failures, and a revision step addresses those failures. Set a stopping condition, such as passing the required checks or reaching a defined retry limit; otherwise, the loop can consume time and tokens without producing a clear improvement.

Build the pipeline in six steps

  1. Define the user-visible outcome. Write down what the finished response or action must accomplish, then turn that into measurable acceptance criteria. Criteria should be checkable, not just aspirations such as “high quality.”
  2. Split the work into bounded tasks. For each task, specify its inputs, expected output, and limits. Create a specialist only when it has a distinct responsibility or tool access; otherwise, extra agents add coordination without a clear role.
  3. Select the control flow. Use manager calls when the coordinator must retain control and synthesize; hand off when a specialist should own the next branch; use code for known ordering and deterministic checks; and fan out only independent tasks.
  4. Specify each task contract. State what the agent should do and what it should return. Where practical, require structured output that downstream code can validate—for example, required fields and allowed categories—rather than relying on prose that is difficult to check consistently.
  5. Collect, validate, and review. Check required fields and supporting evidence before passing results downstream. Have an evaluator compare the work with the acceptance criteria. Retry or revise only when the reviewer identifies a failure the next attempt can plausibly fix.
  6. Monitor and refine. Track output quality, errors, latency, tool use, and cost. Use observed failures to adjust task boundaries, prompts, and permissions, then evaluate changes rather than assuming that adding agents improves the system. OpenAI’s SDK guidance recommends monitoring, iteration, specialization, and evaluations.

Keep the coordinator accountable for synthesis

Delegation does not make the subagents’ outputs a finished answer. In a manager pattern, the manager should check whether each result answers its assigned question, whether the evidence supports it, and whether results conflict or leave a gap. It then decides what to include in the final response. OpenAI’s Agents SDK documentation describes agents-as-tools as suitable when a specialist should help with a bounded subtask but should not take over the user-facing conversation.

  • Require outputs to distinguish findings from uncertainty, and to identify evidence for material claims.
  • Compare overlapping findings instead of treating agreement as proof or silently discarding disagreement.
  • Do not pass an unchecked result into a consequential downstream action.
  • Limit tool permissions to the specialist’s assigned work, and decide in advance which decisions require coordinator review.

Account for overhead and limits in the evidence

Multi-agent systems add coordination work as well as model usage. In an engineering article published June 13, 2025, Anthropic reported that its internal research system—using Claude Opus 4 as lead and Claude Sonnet 4 subagents—outperformed its single-agent Claude Opus 4 baseline by 90.2% on Anthropic’s internal research evaluation. The same article reported agent use at about 4× the tokens of chat interactions and multi-agent systems at about 15× the tokens of chats in its data. These are Anthropic’s vendor-reported results and measurements, not expected gains or cost multipliers for other tasks, models, or deployments.

There is no universally optimal pipeline topology or standard maximum number of agents established by these sources. The guidance comes from official vendor documentation and an internal vendor account, not a neutral benchmark across frameworks. Treat the reported figures as evidence about one system and evaluation, then measure your own workflow’s quality, latency, and cost.

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Check platform behavior before committing

Platform capabilities and limits can change. OpenAI’s Responses API documentation labels its multi-agent feature beta and specifies model and API enablement information. Check the live documentation for compatibility, limits, and SDK behavior before making those details dependencies of a production pipeline.

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