The reason diverse tech products from Linear to Notion are building similar AI agent capabilities is the emergence of a "general harness" architecture. This common pattern—a loop of context engineering, model calls, and tool usage—is a general-purpose framework for solving problems, leading to a convergence of product features across different domains.

Simply offering the latest model is no longer a competitive advantage. True value is created in the system built around the model—the system prompts, tools, and overall scaffolding. This 'harness' is what optimizes a model's performance for specific tasks and delivers a superior user experience.

For years, Google has integrated AI as features into existing products like Gmail. Its new "Antigravity" IDE represents a strategic pivot to building applications from the ground up around an "agent-first" principle. This suggests a future where AI is the core foundation of a product, not just an add-on.

An AI coding agent's performance is driven more by its "harness"—the system for prompting, tool access, and context management—than the underlying foundation model. This orchestration layer is where products create their unique value and where the most critical engineering work lies.

Early agent development used simple frameworks ("scaffolds") to structure model interactions. As LLMs grew more capable, the industry moved to "harnesses"—more opinionated, "batteries-included" systems that provide default tools (like planning and file systems) and handle complex tasks like context compaction automatically.

Beyond a technical concept for coding agents, "harness engineering" provides a powerful mental model for enterprise AI adoption. It reframes the challenge from simply deploying models to redesigning the entire organizational system—processes, data access, and feedback loops—to create an environment where AI capabilities can truly succeed.

The rapid pace of AI paradigm shifts—from simple token-in/token-out models to complex agentic systems—forces a complete infrastructure rewrite every 12 to 18 months. Google's lesson for large organizations is to invest in standardized platforms to avoid having every team reinvent the wheel and fall behind.

Top-tier language models are becoming commoditized in their excellence. The real differentiator in agent performance is now the 'harness'—the specific context, tools, and skills you provide. A minimalist, well-crafted harness on a good model will outperform a bloated setup on a great one.

The planned Superapp combining coding, browsing, and chat is more than a UI consolidation. The deeper, more critical goal is to merge multiple backend systems into a single, unified 'AI harness' that manages context, actions, and interaction loops. This creates a powerful, efficient AI layer for various applications.