Nick Babich on agents in UX Planet. A useful pair to his earlier writeup on Claude skills, since the two words get used interchangeably and they are not the same thing. Babich opens with the plain-language version:

Think of an AI agent as a program you run when you need to solve a particular problem in design. For example, you can create an AI agent that helps you with usability testing, code review, UI/UX audit, etc.

A program you run is the right mental model. A skill, the way Babich described it in his earlier piece, is a recipe: a markdown file Claude reaches for when a task matches. An agent is what runs once Claude has the recipe in hand. It carries state across steps, picks tools, reports back.

Babich’s four attributes of a well-designed agent get at that distinction without saying it out loud:

1. Good clarity (intent alignment). A strong agent understands what success looks like, not just the task. This understanding helps it translate vague prompts into clear objectives.
2. Context awareness. Good agents maintain and use context effectively. Not only do they remember previous steps, constraints, and user preferences (which is well-expected behavior nowadays), but they also adapt output based on the environment (tools, data, stage of workflow).
3. Tool orchestration. Agents can perform the workflow autonomously and they have the ability to use the right tools for a task at hand is what makes an agent so powerful. Well-crafted agents can chain tools together into workflows, and they don’t overuse tools when simple reasoning is enough.
4. Explainability (transparent reasoning). When you interact with an AI agent, you need to understand why something happened. Thus, an AI agent should provide a rationale behind decisions surface assumptions, and trade-offs.

Context awareness and tool orchestration are what separate an agent from a prompt template. A skill can ship intent alignment and explainability in plain markdown, but state across steps and the ability to chain tools require a runtime. That’s why Babich’s specs include Boundaries sections and “When Not To Use It” blocks: a stateful, tool-using program needs guardrails that a one-shot prompt does not.

If you haven’t built one yet, his five specs—Research Synthesizer, Competitor Intelligence, Problem Definition, Idea Generation, UX Flow Designer—are a clean starter pack. Pick the one closest to a workflow you already do by hand, and notice how much of the spec is about what the agent will not do.