Julien Thibeaut is a design engineer who runs Interface Office, a studio helping AI startups build products. His open-source work includes UI Skills, prompt-kit and motion-primitives.[1]
Start with Anatomy of AI Input →Career
Thibeaut’s portfolio connects his independent projects with client work through Interface Office. He describes paying attention to interface details until the experience feels right, and names AI startups among the studio’s clients.[1]
Contributions
Make interface knowledge available to an agent
UI Skills provides a registry of design-engineering instructions. A command-line interface lets a developer browse categories, list skills and fetch a particular entry. Agents can also query the registry through its Model Context Protocol endpoint. A companion playbook distills lessons from the collection. The project organizes access to those instructions rather than replacing design judgment.[2]
Build AI interactions from reusable components
Prompt-kit supplies customizable interface components for AI applications. It builds on shadcn/ui, allowing components such as a prompt input to be installed into a project and imported from the application’s own code. Motion-primitives provides a related set of animated interface components built with Motion and Tailwind CSS.[3][4]
Ideas
In Anatomy of AI Input, Thibeaut explores how the surface for writing a prompt has grown beyond a text box. Attachments, model selection and other controls share the same interaction space. He recommends keeping typing available during generation, avoiding layout jumps and preserving keyboard access. These details let a user revise or stop work while a model responds.[5]
Tools, writing & talks
Writing, research & talks
Start here
Anatomy of AI Inputibelick.comAn exploration of the structure and controls surrounding a modern AI prompt input.
Explore the illustrated input and its controls before considering implementation. It needs no local setup; React and shadcn/ui familiarity helps when moving on to prompt-kit.
Author[5]
Tools
- UI Skills
github.comA registry of design-engineering instructions accessible through a CLI or MCP endpoint.
Creator[1][2]Original source - prompt-kit
github.comCustomizable components for building interfaces around AI applications.
- motion-primitives
github.comReusable motion components for interface design and implementation.