> Conversely, on tasks requiring strict sequential reasoning (like planning in PlanCraft), every multi-agent variant we tested degraded performance by 39-70%. In these scenarios, the overhead of communication fragmented the reasoning process, leaving insufficient "cognitive budget" for the actual task.

> As tasks require more tools (e.g., a coding agent with access to 16+ tools), the "tax" of coordinating multiple agents increases disproportionately.

This aligns well the principle of highly cohesive, loosely coupled design for software components. If you instruct the AI to design this way, it should result in components that're simpler to reason about, and require fewer sequential steps to work on. You can think of cohesion in many different ways, but one is common functions, and another is tool/library dependency.