How to Use the Color Contrast Checker MCP in Google ADK

Run WCAG contrast checks on enterprise UI data directly within your Google ADK agent.

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Connect Color Contrast Checker MCP to Google ADK

Create your Vinkius account to connect Color Contrast Checker to Google ADK 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 Google ADK

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Verify brand colors with Google ADK

`check_color_contrast` calculates the precise contrast ratio between any two colors to prevent accessibility violations on enterprise web apps. Your Google ADK agent pulls color palettes from BigQuery and feeds them directly into this tool. Gemini models use their long-context reasoning to analyze thousands of color combinations in a single run. This setup lets you audit massive legacy design systems without writing custom math functions.

Audit UI surfaces using this MCP Server

`check_dark_mode_surface` and `check_light_mode_surface` measure readability against typical dark and light backgrounds. Your agent uses these tools to flag unreadable text elements across enterprise dashboards. You configure the MCP Server parameters inside your Google ADK pipeline to expose only these surface-level tools. This restriction keeps your agent focused on theme testing without wasting tokens on unused operations.

Test text against absolute black and white

`check_text_on_pure_black` and `check_text_on_pure_white` check how foreground text colors look on absolute black or white canvases. Your Google ADK agent runs these tools to validate high-contrast accessibility modes. The agent processes these checks asynchronously within your Vertex AI pipelines. It catches bad color pairings before they reach your front-end deployment.

Setup guide

Set up Color Contrast Checker MCP in Google ADK

Prerequisites

Python 3.10+ installed
google-adk package (pip install google-adk)
Active Vinkius subscription with a valid endpoint token

1

Install Google ADK

Run pip install google-adk to install the Agent Development Kit. MCP support is included via the McpToolset class.
2

Connect via SSE transport

Use McpToolset.from_server() with SseServerParams pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create an LlmAgent

Pass the returned mcp_tools list directly to LlmAgent(tools=mcp_tools). The ADK maps each MCP tool to a native Gemini function call — no manual schema definitions required.
4

Run with any Gemini model

The agent works with any Gemini model (gemini-2.0-flash, gemini-2.5-pro, etc.). Copy the full example on the right to get started with Color Contrast Checker tools in your ADK agent.

agent.py

from google.adk.agents import LlmAgent
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset
from google.adk.tools.mcp_tool.mcp_session_manager import SseServerParams

# Connect to the MCP via SSE
mcp_tools, exit_stack = await McpToolset.from_server(
    connection_params=SseServerParams(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    )
)

# Create your agent with auto-discovered tools
agent = LlmAgent(
    name="Color Contrast Checker_agent",
    model="gemini-2.0-flash",
    instruction="You have access to Color Contrast Checker tools via MCP.",
    tools=mcp_tools,
)

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Common questions about Color Contrast Checker MCP in Google ADK

Instantiate the MCP toolset with the Vinkius HTTP URL and pass it to your LLM agent tool list. This exposes all eight contrast checking tools to Gemini.

Yes, you can use the tool names parameter to restrict access. If you only want to check dark backgrounds, expose only the dark mode surface tool.

Yes, Gemini can analyze thousands of color combinations from BigQuery and pass them to the contrast tools in a single session. The server handles high-volume requests quickly.

The MCP Server returns a standard error message with the calculated ratio. Your agent reads this output and can log the failure or try a different color.

Only raw hex codes and color strings are sent to this MCP server. Vinkius isolates the execution in a zero-trust environment, so your proprietary UI layouts never leave your Google Cloud perimeter.

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