Open Components
Server Details
Guidelines for UI components with a perfect UX, DX and AX, whether humans or AI agents write them.
- Status
- Healthy
- Last Tested
- Transport
- Streamable HTTP · MCP 2025-11-25
- URL
- Repository
- uxfront-com/open-components
- GitHub Stars
- 7
TDQS
Score is being calculated.
Available Tools
6 toolsget-contractGet ContractRead-onlyIdempotentInspect
Returns the contract of a component or a foundation, as YAML: its API (props, slots and events), its DOM contract (element, role, states, keyboard and parts), its tokens, and every rule in its checklist, each with a stable ID (like button/keep-focus), a level (must or should), a scope (component, usage or both) and how to check it. It holds every requirement in a fraction of the page's length, and it's the same file as https://opencomponents.dev/raw/docs/.yaml.
WHEN TO USE: first, before you build, review or explain a component or its tokens. WHEN NOT TO USE: for some of the rules only (by scope, layer, level or check), use list-rules. For the reasoning or the examples behind a rule, use get-page with its sections.
| Name | Required | Description | Default |
|---|---|---|---|
| component | Yes | The component or foundation, like button or design-tokens. |
get-pageGet PageRead-onlyIdempotentInspect
Reads a docs page as markdown, whole or just the sections you name. Component pages explain why each rule exists, with examples in React, Vue, Svelte, Angular, Solid, Astro and Vanilla: pass a framework to keep only its examples.
WHEN TO USE: for the reasoning, an example or the details behind a rule (like the sections ["Loading"] of the button's page), or for a page without a contract, like the introduction or the roadmap. WHEN NOT TO USE: for the requirements alone, use get-contract or list-rules, which are much shorter. To find which page or section covers a topic, use search-docs.
A page longer than about 8,000 tokens, like the button's, returns its outline instead: every heading with its anchor and length, so you can ask for the sections you need. So do sections that are too long to return together.
| Name | Required | Description | Default |
|---|---|---|---|
| path | Yes | The page: its name (introduction, roadmap, mcp-server, agent-plugin, design-tokens, button, spinner, input), or its path, like /docs/components/button. A URL's #anchor, like the ones search-docs returns, reads that section. | |
| sections | No | The sections to read, by heading or anchor, like ["Loading"] or ["#ux-rules"]. Each comes with its sub-sections. Name a parent to tell apart headings that repeat, as in "Every state > Loading". | |
| framework | No | Your framework, to keep only its examples. |
get-reference-implementationGet Reference ImplementationRead-onlyIdempotentInspect
Returns a shipped component's reference implementation: a Vue 3 component that meets every rule in its checklist, the tests that prove it, the helpers it shares with other components and its theme tokens. The live examples on the site run on this code.
WHEN TO USE: to build a component that meets the standard, in Vue or by porting it and its tests to another framework, or to see how a rule is met in code. WHEN NOT TO USE: for the requirements, use get-contract. For how the component is used in another framework, use get-page with that framework.
| Name | Required | Description | Default |
|---|---|---|---|
| files | No | Only these files, like ["Button.vue"] or ["Button.test.ts"]. Leave it out for every file. | |
| component | Yes | A component with a reference implementation, like button. |
list-componentsList ComponentsRead-onlyIdempotentInspect
Lists what the Open Components standard covers: the components that have shipped (like Button), the foundations every component follows (like Design Tokens), and the components planned on the Roadmap.
WHEN TO USE: to check whether a component has a standard yet, to get the name the other tools take for it, or to see what's planned. WHEN NOT TO USE: if you already know the component, call get-contract directly. To find a topic in the docs, use search-docs.
Shipped entries come with their page, their contract and how many rules they have. Planned ones have no page, contract or rules yet: hold them to the three layers and Design Tokens, following the Button's structure, as the build-component prompt does.
| Name | Required | Description | Default |
|---|---|---|---|
| status | No | Which components to list. | all |
Output Schema
| Name | Required | Description |
|---|---|---|
| total | Yes | |
| components | Yes |
list-rulesList RulesRead-onlyIdempotentInspect
Lists checklist rules as records, filtered by component, ID, scope, layer, level or check. Each rule has a stable ID to cite in reviews and commits, its level (must or should), its scope, its requirement, how to check it (like a unit test, a review or axe's button-name rule) and a link to it.
WHEN TO USE: to review code rule by rule, to get only the rules that apply to a task, to look rules up by ID, or to find the ones a tool can check. Pass scope ["component", "both"] to build or review a component, and ["usage", "both"] to review a screen that uses it. WHEN NOT TO USE: for a component's API, DOM contract and tokens, use get-contract, which has every rule too.
A component meets the standard when it meets every must rule. Each should rule is expected unless there's a good reason not to follow it.
| Name | Required | Description | Default |
|---|---|---|---|
| ids | No | The IDs of the rules to look up, like ["button/keep-focus"]. | |
| check | No | How the rule is checked. | |
| layer | No | ui (how it looks), ux (user experience), dx (developer experience) or ax (agentic experience). | |
| level | No | ||
| scope | No | Who meets the rule: component (the component itself), usage (the code that uses it) or both. Rules without a scope, like the Design Tokens', match any scope. | |
| automated | No | true for the rules tools check all of (unit tests, axe, a type check, a linter or a visual regression test), false for the ones a person checks, at least in part. | |
| component | No | The component or foundation, like button or design-tokens. |
Output Schema
| Name | Required | Description |
|---|---|---|
| rules | Yes | |
| total | Yes | |
| unknown | No | The IDs asked for that no rule has, with the ones that might have been meant. |
search-docsSearch DocsRead-onlyIdempotentInspect
Searches the whole standard, every section of every page and every checklist rule, and returns the best matches: where each one is, a short excerpt, and for rules, their ID, level and scope.
WHEN TO USE: to find where a topic is covered when you don't know the page or the section, like "focus after delete", "spinner", "aria-pressed" or "dark mode". Then read a section with get-page, or rules with list-rules. WHEN NOT TO USE: to list a component's rules, use list-rules. To see which components there are, use list-components.
Search for a few specific words rather than a whole question.
| Name | Required | Description | Default |
|---|---|---|---|
| type | No | Only search sections, or only rules. | |
| limit | No | How many results to return, at most. | |
| query | Yes | A few words, like "focus after delete" or "aria-pressed". | |
| component | No | Only search this page and its rules, like button or design-tokens. |
Output Schema
| Name | Required | Description |
|---|---|---|
| query | Yes | |
| total | Yes | How many sections and rules match, of which the best come first. |
| results | Yes |
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
6 tool updates
- First observed
get-contract - First observed
get-page - First observed
get-reference-implementation - First observed
list-components - First observed
list-rules - First observed
search-docs
Related MCP Connectors
A design harness for AI coding agents: design systems, design principles, icons and UI review.
Live React design-system APIs, patterns, and code validation so AI agents build real UI, not slop.
Mlola UI components, tokens and design rules for coding agents, with a markup checker
Real product UI captures (onboarding, pricing, in-app screens) with design guides for coding agents.
Related MCP Servers
- AlicenseNot gradedqualityBmaintenanceProvides design systems, UI prompts, and layout variation guidance to AI coding tools for generating better user interfaces.409 npm2,013MIT
- AlicenseNot gradedqualityAmaintenanceEnables AI coding assistants to generate bespoke design systems by synthesizing OKLCH color palettes, chamfer highlights and spring physics, teaching layout composition grammar, and returning micro-interaction primitives and component blueprints. Also audits JSX/TSX/HTML through a senior design director's lens to score and critique UI quality.1 npm1MIT
- AlicenseBqualityDmaintenanceProvides AI assistants with tools to grade, generate, and validate UI components against the components.build specification. Supports searching documentation, checking compliance, and generating framework-agnostic accessible components.118 npmApache 2.0
- FlicenseBqualityDmaintenanceProvides design system guidelines and component documentation to Cursor Desktop, enabling accurate advice on UI components, patterns, and best practices.11-
Glama MCP Gateway
Add one secure layer between your agents and this server.