Anthropic's platform team, which powers its external developer API and internal products, argues that models are now steerable enough to eliminate traditional 'harness' walls, moving the value creation to assigning specific jobs to each token within a meta-harness. The company plans to offer more coordination primitives and views model routing as its sole closed-door technology, while making skills and MCP (Managed Compute Platform) open to the industry. Anthropic encourages developers to delete old steering harnesses, focusing instead on letting models run longer and leveraging 'best-of-N' strategies as a third lever for agent performance.