Agent + Subagent Systems with OpenCode, Claude Code, and OpenClaw

Single-agent setups are useful for small tasks, but complex product work needs role separation. In larger builds, one model handling everything causes context overload, weaker focus, and inconsistent output quality. A better model is to design agent systems the way we design engineering teams: one coordinator and specialized executors with clear boundaries.

In this setup, a parent agent handles planning and decomposition. Subagents handle focused tasks such as UI implementation, API integration, QA generation, docs updates, and release notes. OpenCode is great for controlled local execution loops. Claude Code handles deep reasoning and architecture-level refactors. OpenClaw adds orchestration logic so handoffs between agents become predictable and traceable.

The biggest unlock is role contracts. Every role should define: what inputs it accepts, what outputs it returns, what files it can touch, and what confidence checks it must run before handoff. Once these contracts are explicit, agent systems become easier to debug, easier to scale, and easier for humans to trust.

Multi-agent delivery does not eliminate human engineering judgment. It amplifies it. When role design is clear, you get faster iteration, fewer execution blind spots, and a system that behaves more like a reliable product team than a random prompt experiment.