How to Use the Design Prover MCP in Claude

Stop your agent from shipping boring UIs. This is a design checklist for your Claude Desktop agent, forcing it to think before it codes.

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Connect Design Prover MCP to Claude Desktop

Create your Vinkius account to connect Design Prover to Claude Desktop and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Design Prover with Claude Desktop

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Break the AI Design Mold

The `prove_design` tool stops your agent from building another generic webpage. You know the one: a hero, two rows of three cards, and a CTA. It looks like an AI made it because an AI made it. This tool acts as a gate, forcing the agent to prove its design has a real personality. Before Claude writes a line of HTML, it sends its plan to this tool. If the plan involves boring grids, uniform padding, or the default blue-and-gray color scheme, it gets rejected. The result is that you and your agent have to think about the design first, which is the whole point.

Enforce Real Design Principles

This isn't about vague suggestions. The `prove_design` tool checks five concrete rules. It looks for a single focal point that dominates the screen. It demands an unpredictable layout, not a simple grid. It checks for intentional whitespace, both dramatic and tight. It requires a typographic scale with real contrast, not just a few default sizes. Finally, it makes the agent justify its color choices. Why those hex codes? What mood do they create? If the agent can't answer these questions, its design is denied. This forces it to generate UIs that look like a human with a point of view designed them.

Instant Feedback in Your Claude Desktop MCP Server

Get design feedback right in your chat window. When you ask Claude to build a UI, it runs its plan against the Design Prover tool. You'll see the pass/fail result immediately. If it fails, the tool tells you exactly why—'flat hierarchy' or 'uniform padding,' for example. This tight feedback loop lets you iterate quickly. You just refine your prompt based on the feedback and try again. It works the same whether you're using the local extension in the native app or a custom connector on the web. It's a simple check that saves you from throwing away a fully coded, but poorly designed, interface.

Setup guide

Set up Design Prover MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The Design Prover MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the Design Prover MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under design-prover-mcp.

json

{
  "mcpServers": {
    "design-prover-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Design Prover. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Design Prover MCP in Claude Desktop

It's a checkpoint. Before Claude's agent writes frontend code, it sends a text description of its design plan to the `prove_design` tool. If the plan is generic, the tool rejects it with a reason, forcing the agent to try again with a better design.

Yes. In your settings, go to Integrations and add a custom connector. Just paste your Vinkius MCP server URL. The tool will be available to your agent immediately, no install required.

The tool sends a specific reason for the failure back to the chat. You'll see why it was rejected—like 'layout is a predictable grid' or 'no clear focal point.' Use that feedback to give Claude a more specific prompt.

No, it's for any UI element. It forces your agent to think about visual hierarchy and personality, whether it's building a complete page, a single component, or an interactive view inside the chat itself.

It only ever sees the text-based design plan your agent creates for a specific UI task. Your Vinkius MCP server runs the check in a sandboxed V8 isolate, and the design plan text is discarded the moment the check is done. No data is stored.

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