In a 2026 case study, Antonio Lopes Correia compared a single-agent customer-support system with a team-based version using the same evaluation suite. None of the five reported outcome measures changed. His explanation: the redesign changed which component called the system’s safeguards, but kept the classifier and core business controls the same.
What changed—and what did not
The system handled customer-support requests that could require either a knowledge answer or a refund action. Correia’s team design divided responsibilities among triage, refund handling, knowledge answering, and coordination. Both versions implemented the same interface, allowing the evaluation suite to assess them without knowing which architecture it was grading.
Correia reports that both versions used the same intent classifier. The refund specialist also retained the same customer-data scoping, eligibility, policy, and risk-gate components used by the single-agent version. In his words: “Splitting the caller changed who invokes the boundary. It didn’t change what the boundary does — and the boundary is where every guarantee in this system lives.”
Reported evaluation results
These are figures reported by Correia in his 2026 article, not independently audited metrics or general benchmarks.
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| Measure | Baseline | Candidate | Change |
|---|---|---|---|
| Safety | 1.000 | 1.000 | +0.000 |
| Gate outcome | 1.000 | 1.000 | +0.000 |
| Intent accuracy | 0.875 | 0.875 | +0.000 |
| Groundedness | 1.000 | 1.000 | +0.000 |
| Answered | 0.667 | 0.667 | +0.000 |
Correia also reports zero fixed scenarios and zero broken scenarios. The available account does not specify sample size or confidence intervals, and no external replication is established. The results therefore describe this evaluation, not how multi-agent systems perform in general.
The implementation got bigger
Although the reported outcome measures stayed flat, the implementation expanded. Correia counts production types, lines of code, and orchestration hops as follows:
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| Implementation measure | Single-agent version | Team version |
|---|---|---|
| Production types | 1 | 5 |
| Lines of code | 91 | 127 |
| Orchestration hops | 1 | 2 |
Those are the author’s implementation counts. They are not a latency or operating-cost benchmark. Correia notes that a runtime design where agents each make their own model call would require at least two calls for a request; that is conditional on the design, not a measured count for every multi-agent system. Separate calls may add latency and create opportunities for agents to disagree, but the article does not quantify those effects.
Structural delegation is not the same as runtime agents
The team in this case split responsibilities and orchestration around the existing boundaries. That is different from a runtime system in which role-specific agents independently call a model, use their own prompts and tools, and potentially work in parallel.
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Correia identifies possible reasons to use runtime agents: distinct tools or prompts for different roles, and parallel execution. Those advantages matter only if they solve a concrete problem. Parallelism, for example, is useful when tasks can genuinely proceed independently and take long enough for reduced elapsed time to matter. The article offers no separate benchmark establishing when those benefits outweigh the additional calls, handoffs, and complexity.
When adding agents may be worth reconsidering
Correia says he would revisit the design under specific conditions. For another system, these can serve as questions to test rather than a universal ranking of architectures:
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- Are the actions and tools genuinely distinct? Multiple action types with disjoint tool sets can make role separation useful.
- Can meaningful work happen in parallel? Independent tasks that take enough time to affect user-visible latency may benefit from parallel execution.
- Does a role need a different model? A capability or cost need should justify using a model suited to that role, rather than adding agents by default.
- Does evaluation show an improvement? Compare the architectures on the same representative tasks and relevant measures; complexity alone is not evidence of better outcomes.
In Correia’s system, a MultiAgentEquivalenceTest runs both designs on every build and asserts zero difference. He says a changed test result would prompt a fresh look at the decision. This makes the rejected architecture runnable and the comparison repeatable as the system changes.
The practical question to ask
Before adding another agent, identify the capability the current design lacks: a distinct tool boundary, useful parallel work, a role-specific model, or a measurable quality improvement. Then compare both versions against the same evaluation suite and account for the extra handoffs and implementation surface. In this case, the shared classifier and deterministic controls explain why the author believes splitting responsibilities did not change outcomes; another system may have different boundaries and different results.
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