We spent our first weeks saying API when we meant MCP, and our agent politely built the wrong thing. Here's the kitchen-terms explanation that finally stuck — an API is another kitchen's order counter, MCP hands your agent the appliances — plus a ten-minute exercise that makes the difference physical.
Confession: we used to finish a feature, duplicate the entire project folder as a backup, and delete everything when an experiment failed. Then Git ended the ritual. Here's the save-system mental model, the seven commands that cover 95% of your needs — and how to run all of it in plain English through your agent.
We gave the same physics-simulation prompt to Fable 5, Opus 4.8, Sonnet 5, and Haiku 4.5 — one shot each, effort pinned, no retries — then ran all four artifacts in a real browser. Three passed. One lost its balls, literally. Play all four demos yourself.
Google's Antigravity is a full agent workbench you download like any app — and your Google AI subscription already covers it. From download to a working app in one sitting.
You already pay for ChatGPT — and that same subscription includes Codex, a coding agent that lives inside VS Code. Fifteen minutes from install to an app you can click.
Your Claude Pro subscription includes Claude Code — a coding agent with a reputation among professionals, one extension install away. First app in 15 minutes.