Everyone is Building AI Subagents - But Most Devs Still Don’t Understand Context Engineering

Every developer wants subagents now. One agent for testing, one for docs, one for refactors, one for code reviews. Sounds smart. Looks modern too. But here’s the problem: most teams are stacking subagents on top of weak context, and that breaks the whole system. If the model gets the wrong tools, stale memory, noisy history, or missing repo facts, your shiny agent setup turns into expensive confusion. In 2026, the real edge is not adding more agents. It’s designing better context. That is the di