The new paradigm for building powerful tools is to design them for AI models. Instead of complex GUIs, developers should create simple, well-documented command-line interfaces (CLIs). Agents can easily understand and chain these CLIs together, exponentially increasing their capabilities far more effectively than trying to navigate a human-centric UI.

The enthusiastic reception for Google's Workspace CLI reveals a counter-intuitive trend: old-school Command-Line Interfaces are becoming the preferred way for AI agents to interact with software. Unlike humans, agents don't need GUIs and benefit from the CLI's deterministic, low-friction nature, avoiding the 'abstraction tax' of newer API layers.

While direct vector space communication between AI agents would be most efficient, the reality of heterogeneous systems and human-in-the-loop collaboration makes natural language the necessary lowest common denominator for interoperability for the foreseeable future.

While GUIs were built for humans, the terminal is more "empathetic to the machine." Coding agents are more effective using CLIs because it provides a direct, scriptable, and universal way to interact with a system's tools, leveraging vast amounts of pre-trained shell command data.

The future of AI requires two distinct interaction models. One is the conversational "agent," akin to collaborating with a person. The other is the formally programmed "system." These are different paradigms for different needs, like a chair versus a table, not a single evolutionary path.

The best UI for an AI tool is a direct function of the underlying model's power. A more capable model unlocks more autonomous 'form factors.' For example, the sudden rise of CLI agents was only possible once models like Claude 3 became capable enough to reliably handle multi-step tasks.

Instead of designing tools for human usability, the creator built command-line interfaces (CLIs) that align with how AI models process information. This "agentic-driven" approach allows an AI to easily understand and scale its capabilities across numerous small, single-purpose programs on a user's machine.

The 'agents vs. applications' debate is a false dichotomy. Future applications will be sophisticated, orchestrated systems that embed agentic capabilities. They will feature multiple LLMs, deterministic logic, and robust permission models, representing an evolution of software, not a replacement of it.

A more likely AI future involves an ecosystem of specialized agents, each mastering a specific domain (e.g., physical vs. digital worlds), rather than a single, monolithic AGI that understands everything. These agents will require protocols to interact.