Arc UI MCP Server

by uiarc Your server? Claim it

answering

Arc UI is answering right now. Last checked 5 min ago. It exposes 5 tools. Last commit 24 Oct 2026.

React components and blocks with motion. Search docs, props and shadcn install commands.

Uptime history 26 days of history

26 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

1192 ms

Response time

average over 24h

978

Stars

last commit 24 Oct 2026

What the code does

We read the source, 1 d ago · tools taken from the live server · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Builds a database query by concatenation registry/components/chip-group/chip-group.tsx:166

    const update = () => grown.set(Math.max(0, (slot.current + lag.get()) / SLOT));

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 5 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add arc --transport http https://uiarc.dev/api/mcp

Settings → Connectors → Add custom connector, then paste this address

https://uiarc.dev/api/mcp

~/.codex/config.toml

[mcp_servers.arc]
url = "https://uiarc.dev/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "arc": {
      "url": "https://uiarc.dev/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "arc": {
      "type": "http",
      "url": "https://uiarc.dev/api/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Available tools 5

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

components

list_components

List Arc components and blocks with name, description, tier, and links. Filter by category (Actions, Inputs, Disclosure, Feedback, Data, Text, Special, Blocks), tag, tier (free or pro), or kind (component or block).

search_components

Search Arc components and blocks by intent, e.g. "confirm destructive action", "date range", or "pricing page". Returns the best matches first.

component

get_component

Get full documentation for one Arc component or block: when to use it, when not to (with the better alternative), usage and extra examples, props, keyboard, accessibility, motion, responsive behavior, performance, keywords, related items, and the install command. structuredContent.api carries the same fields as JSON. With an Arc Pro token (Authorization header), Pro items also include their full source files in structuredContent.files.

install

get_install_command

Get the shadcn CLI command that installs one or more Arc components or blocks, including shared foundation tokens and Arc dependencies, plus setup notes. Free items always; Pro items (@uiarc-pro registry) when the connection carries an Arc Pro token.

skill

get_skill

Get one Arc skill file as markdown: rules for building with Arc. Free skills: SKILL (entry point: workflow, principles, never-do list, and quick decisions); INSTRUCTIONS (short always-on rules for agents.md, claude.md, or cursor rules); checklist (the review loop to run before finishing, with grep sweeps); components (choosing the right component or block by job, with ids); composition (page containers, dashboards, marketing sections, states, react correctness); copy (sentence case, no eyebrows or em dashes, verbs on buttons, honest claims); design (color, type, surfaces, concentric radii, spacing, and icons); motion (motion tokens, spring choice, patterns with code, reduced motion); accessibility (focus without rings, semantics, keyboard, and announcements); responsive (widths to check, overflow, tables, and touch targets); example-settings (a worked account settings page); example-pricing (a worked pricing section with plans, comparison, and faq); example-dashboard (a worked analytics overview with kpis, chart, and table). Pro skills (arc-pro, full-page-generation, page-composition, design-system-generation, refactor-to-arc, motion-recommendations, responsive-optimization, accessibility-audit) are returned in full when the connection carries an Arc Pro token (otherwise signed-in Pro members download them at /api/skills and this tool returns where).

Endpoints

URL	Transport	State	Latency	Checked
https://uiarc.dev/api/mcp	streamable-http	sign-in	1223 ms	5 min ago

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Arc UI — questions

Answers built from our own checks of this server.

What can Arc UI do?

It exposes 5 tools, read directly from the server on our last check. Among them: get_component, get_install_command, get_skill, list_components, search_components. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Arc UI working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 1192 ms. The bar chart above shows every period we have measured.

How do I connect Arc UI?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.

How do you sign in to Arc UI?

No API key is involved. Arc UI answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.

How fast is Arc UI?

It answers our handshake in 1192 ms on average, which is faster than 3% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Arc UI open source?

The code is open source: it is published under the MIT licence, written in TypeScript, 978 stars on GitHub and 3 open issues. The licence covers the code in the repository, not the hosted service at uiarc.dev, which runs on its operator's own terms.