The prompt is the basic unit of human–AI interaction — the place where intent meets a model. An entire discipline has grown up around writing, sharing, selling, and versioning prompts, and there is no purpose-built namespace for it. .prompt is that home: for prompt libraries, prompt-engineering studios, AI products, and the marketplaces trading them.
It is also the single string in this portfolio with a marketplace already attached. ai.Best runs a prompt-and-workflow marketplace inside its multi-model AI platform — which means demand for a .prompt address is not hypothetical, it is operational.