How to Use the Color Contrast Checker MCP in Claude Code

Bring WCAG compliance into your terminal. Claude Code uses this MCP server to validate contrast ratios in your build scripts.

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Connect Color Contrast Checker MCP to Claude Code

Create your Vinkius account to connect Color Contrast Checker to Claude Code 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 Color Contrast Checker with Claude Code

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Claude Code automates accessibility audits

Pipe your design tokens into `check_color_contrast` to verify compliance in a headless environment. Claude Code processes the output for your CI/CD logs. This is essential for automated testing. You can trigger these checks whenever a developer pushes changes to the design system.

Headless contrast validation for Claude Code

Use `check_black_text_on_bg` and `check_white_text_on_bg` to enforce standards via shell scripts. Claude Code reads the results and fails the build if contrast falls below WCAG levels. This keeps your codebase clean. You get instant alerts in your terminal if a new color variable violates accessibility rules.

Surface contrast checks via CLI

Claude Code uses `check_dark_mode_surface` to audit theme consistency across your project. It runs the check and reports the ratio back to your terminal. This prevents regressions in your design system. You maintain full control over the audit process from your command line.

Setup guide

Set up Color Contrast Checker MCP in Claude Code

Prerequisites

Claude Code CLI installed (npm install -g @anthropic-ai/claude-code)
Active Vinkius subscription with a valid endpoint token

1

Run the add command

Open your terminal and run the command shown on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com. Use --scope user to make it available across all projects.
2

Verify the connection

Start a Claude Code session and type /mcp to list connected servers. You should see color-contrast-checker-mcp with a green status indicator.
3

Start using tools

Ask Claude Code something like "Check my latest Color Contrast Checker transactions." It will automatically discover and invoke the available Color Contrast Checker tools.

Terminal

claude mcp add --transport http color-contrast-checker-mcp https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

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Prerequisites

Claude Code CLI installed
Active Vinkius subscription with a valid endpoint token

1

Open the config file

Create or edit .mcp.json in your project root for project-level scope, or ~/.claude.json for user-level scope.
2

Add the Color Contrast Checker MCP

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

Restart Claude Code

Start a new Claude Code session. Type /mcp to confirm the server is connected. The tools will be automatically available in your conversation.

.mcp.json

{
  "mcpServers": {
    "color-contrast-checker-mcp": {
      "type": "url",
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

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Common questions about Color Contrast Checker MCP in Claude Code

Add the server via the claude mcp add command. Once linked, you can call the tools directly in your terminal prompts.

Yes. Since it's a CLI-first tool, you can script these checks to run automatically before deployments.

Yes. You can write a script that has the agent loop through your entire color palette and check each one.

It returns the calculated contrast ratio and whether it passes the WCAG standards for small or large text.

It only reads the specific color values you provide in your prompt. It has no access to your environment variables or private source code.

Use it with your favorite AI tools

Connect this server to Cursor, Claude, VS Code, and more.

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