
The Agent Harness Is Eating Itself: How Models Absorbed Their Own Scaffolding and What Comes Next
The agents that suddenly started working around Christmas 2025 were not the product of a single breakthrough. They were the result of two curves finally crossing: model capability and agent harness maturity. The harness, the invisible scaffolding of tools, context, and guardrails that turns a raw model into an agent, is now being absorbed into the models themselves. And the next phase, according to agentic engineer Dan McAteer, will turn the harness into something entirely different: an interface for human attention.


