Multi-agent architecture evolution — from rigid pipelines to code-first domain-agnostic harnesses¶
Insight: Multi-agent system architecture has undergone three phases in two years: (1) domain-specific multi-agent chains with fragile sub-components (Dec 2024), (2) simplified orchestrator + worker patterns as models improved (Jul 2025), (3) code-first, domain-agnostic harnesses where agents solve non-coding problems through code (Jan 2026). The trend of "more intelligence means less architecture" has accelerated — less rigid assembly lines, more reliance on model reasoning.
Detail: Raw model improvements have obsoleted many of the architectural workarounds from earlier phases. The current paradigm uses consistent, domain-agnostic harnesses rather than specialized agent pipelines. Scripting that started as data analysis tooling is now the primary execution medium for agents tackling diverse problem domains. This consolidation of tools and patterns suggests the agent infrastructure layer is maturing.