Open Components

Name: Open Components
Author: uxfront

Open Components is the standard for perfect UI components: guidelines for building UI components with a perfect user experience, developer experience and agentic experience, whether humans or AI agents write them.

Open Components is part of UXFront, written and maintained by @alexgrozav.

Homepage · Documentation · Changelog · llms.txt · Issue Tracker

The standard
Reading the standard
For agents
Bugs and feature requests
Contributing
Creator
Copyright and license

The standard

The standard has three layers, one for each audience a component serves. A component meets the standard when it meets all three.

User experience (UX): components behave the way people expect them to, with any input, on any device and for every ability. Accessible, predictable, every state, adaptive.
Developer experience (DX): one clear API, learned once and used everywhere. Knowing one component means knowing them all. Consistent, type-safe, composable, controllable.
Agentic experience (AX): components that AI agents can read, reason about and build with, so their output meets the same bar as yours. Semantic, described, deterministic, verifiable.

Learn the guidelines once, then hold every component to the same high standards, whether you or your agents write it.

Reading the standard

Start with the Introduction, which walks through the three layers and what each one asks of a component. The guidelines live as markdown in content/docs/, so you can also read them right here on GitHub.

For agents

If your agent supports MCP, connect it to our MCP server at https://mcp.opencomponents.dev/mcp, free and with no sign-in. It gives agents the contracts, every rule and the docs a section at a time, as tools. The MCP Server page shows how to connect Claude, Codex, Cursor, VS Code, Gemini CLI, Grok, Hermes Agent and other clients.

Or install our agent plugin, in plugins/open-components, which connects the same server along with skills that build and review components the way the standard asks. It's an Agent Plugin, so it works in VS Code, GitHub Copilot, Cursor, Codex, Claude Code and other clients that support the format. The Agent Plugin page shows how to install it.

Every page of the documentation is also published as markdown, so agents can read the standard and check their work against it:

https://opencomponents.dev/raw/<path>.md holds one page, as in /raw/docs/getting-started/introduction.md for the introduction.
https://opencomponents.dev/raw/<path>.yaml holds a page's contract, with every rule from its checklist, as in /raw/docs/components/button.yaml. It's every requirement in a fraction of the page's length.
/schemas/contract.json is the JSON Schema every contract follows, so you can validate them, and contracts of your own. Each contract names it on its first line, so editors that use the YAML language server check it as you type.
/llms.txt lists every page and every contract.
/llms-full.txt holds them all in one file. Point your agent at it to give it the whole standard in one request.

Bugs and feature requests

Found a bug on the site, a gap in the guidelines or an idea for a new one? Please first search for existing and closed issues. If your problem or idea is not addressed yet, please open a new issue.

Contributing

Please read through our contributing guide. There you can find how to run the site locally, edit the guidelines and deploy. Everyone taking part in the project agrees to follow our Code of Conduct.

Thanks goes to these wonderful people!

Creator

Alex Grozav

If you use Open Components in your daily work and feel that it has made your life easier, please consider sponsoring me on GitHub Sponsors. 💖

Copyright and license

Copyright © 2026 UXFront. The site code is released under the MIT License. The guidelines in content/ and the agent plugin in plugins/open-components/ are released under the Creative Commons Attribution 4.0 License: you can share and adapt them, commercially too, as long as you credit Open Components.