Even a specialized task like coding involves a wide range of human-like interaction: brainstorming, searching, and more. This "AGI-completeness" means a powerful general model with a good "bedside manner" can outperform a narrowly specialized one, complicating the strategy for vertical AI apps.

The most significant productivity gains come from applying AI to every stage of development, including research, planning, product marketing, and status updates. Limiting AI to just code generation misses the larger opportunity to automate the entire engineering process.

Instead of a single, generalizable AI, we are creating 'Functional AGI'—a collection of specialized AIs layered together. This system will feel like AGI to users but lacks true cross-domain reasoning, as progress in one area (like coding) doesn't translate to others (like history).

As AI agents handle the mechanics of code generation, the primary role of a developer is elevated. The new bottlenecks are not typing speed or syntax, but higher-level cognitive tasks: deciding what to build, designing system architecture, and curating the AI's work.

Unlike traditional programming, which demands extreme precision, modern AI agents operate from business-oriented prompts. Given a high-level goal and minimal context (like a single class name), an AI can infer intent and generate a complete, multi-file solution.

The ability to code is not just another domain for AI; it's a meta-skill. An AI that can program can build tools on demand to solve problems in nearly any digital domain, effectively simulating general competence. This makes mastery of code a form of instrumental, functional AGI for most economically valuable work.

The next major advance for AI in software development is not just completing tasks, but deeply understanding entire codebases. This capability aims to "mind meld" the human with the AI, enabling them to collaboratively tackle problems that neither could solve alone.

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.

Replit CEO Amjad Massad argues that the ability to write and execute code is a form of general intelligence. This insight suggests that building general-purpose coding agents will outperform handcrafting specialized, expert-knowledge agents for specific verticals, representing a more direct and scalable approach to achieving AGI.