Skill, agent, or app — which form should you build your expertise into?

Expertise now gets packaged into one of three forms — a skill, an agent, or a full app — and picking the right one depends on whether your audience wants to learn your process or just get the result. None of this is actually new; only the containers changed shape. The consulting project became the agent. The short how-to guide became the skill. The custom-built software became the vibe-coded app. The underlying job is the same: packaging what you know so other people can use it.

Skills are a small, sharp piece of judgment someone drops into their existing AI workflow — a folder with a markdown file that tells an assistant "when this kind of task comes up, handle it this way." Use a skill when your expertise is a rule of thumb, a checklist, or a structural preference: "always rewrite cold email openers to lead with a question," or "surface the methodology before the conclusions when summarizing a research paper." What used to be a short guide like "5 ways to write cold emails with great open rates" now ships as a skill — and it's a strong format for building credibility publicly, since skills are easy to share and demonstrate.

Agents are for when the user wants the outcome, not the steps. Most people don't want to learn how to write a buyer persona — they want a buyer persona. An agent skips the teaching and just does the thing. This is where most bottled expertise ends up living, because most people, most of the time, want results over process — and it's the layer where monetization is starting to work, from per-message payouts to demand that outpaced the now-stalled GPT Store.

Vibe-coded apps are still software, just dramatically faster to build — a full experience shipped by one person in days instead of a team in months. The build is no longer the bottleneck; distribution is. Getting anyone to use, pay for, and stick with an app is as hard as it's ever been, and most expertise doesn't need a whole app to be useful — a skill or an agent gets you 90% of the way for most use cases. Reserve a full app for after you've validated demand and the agent form is starting to strain under what you're asking it to do.