How to Use the Color Contrast Checker MCP in LlamaIndex

Q: Can LlamaIndex search through past Color Contrast Checker runs?

Yes, because LlamaIndex can save the outputs of tools like checkwhitetextonbg into your vector store. Your agent can then perform semantic search over past contrast checks to find reusable, compliant colors.

Index accessibility audits into your LlamaIndex knowledge base to ground design decisions in real WCAG data.

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Connect Color Contrast Checker MCP to LlamaIndex

Create your Vinkius account to connect Color Contrast Checker to LlamaIndex 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 LlamaIndex

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Ground LlamaIndex RAG in actual contrast data

Stop letting your RAG pipeline hallucinate accessibility compliance. By integrating this MCP server with your knowledge agent, you can index the results of `check_color_contrast` directly into your LlamaIndex vector store. Your LlamaIndex agent can query past design decisions and find out exactly why a certain palette was chosen. It uses actual WCAG compliance metrics instead of guessing what looks readable.

Audit surface contrasts automatically

Checking text readability on clean surfaces is straightforward with tools like `check_text_on_pure_white` and `check_text_on_pure_black`. Your LlamaIndex agent can run these checks across your entire UI component library and index the results. When building new interfaces, the LlamaIndex agent searches this index to find compliant background-foreground pairs. It keeps your design system consistent without running redundant API calls.

Validate dark mode and error states

Complex interfaces require checking specialized states. Use `check_dark_mode_surface` and `check_danger_text_contrast` to verify that error logs and dark theme cards remain readable in your LlamaIndex RAG application. The agent saves these specific contrast ratios in your LlamaIndex vector database. You get a searchable history of your application's visual compliance over time.

Setup guide

Set up Color Contrast Checker MCP in LlamaIndex

Prerequisites

Python 3.10+ installed
llama-index-tools-mcp package
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run pip install llama-index-tools-mcp llama-index-llms-openai. The MCP tools package provides BasicMCPClient and McpToolSpec.
2

Connect with BasicMCPClient
Point BasicMCPClient to your Vinkius endpoint URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. Supports SSE and Streamable HTTP transports.
3

Convert to LlamaIndex tools
Call mcp_tool_spec.to_tool_list_async() to convert all Color Contrast Checker MCP tools into native FunctionTool objects that any LlamaIndex agent can use.
4

Run with any LLM
Create a FunctionAgent with the tools and your preferred LLM. Swap OpenAI for Anthropic, Gemini, or any LlamaIndex-supported provider.

agent.py

from llama_index.tools.mcp import BasicMCPClient, McpToolSpec
from llama_index.core.agent.workflow import FunctionAgent
from llama_index.llms.openai import OpenAI

# Connect to the MCP
mcp_client = BasicMCPClient(
    "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
)
mcp_tool_spec = McpToolSpec(client=mcp_client)

# Convert MCP tools to LlamaIndex tools
tools = await mcp_tool_spec.to_tool_list_async()

# Create and run the agent
agent = FunctionAgent(
    tools=tools,
    llm=OpenAI(model="gpt-4o"),
    system_prompt="You have access to Color Contrast Checker tools.",
)
response = await agent.run("List recent Color Contrast Checker data")

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Common questions about Color Contrast Checker MCP in LlamaIndex

Install the LlamaIndex MCP integration package and connect to your endpoint. Convert the tools using McpToolSpec and pass them to your FunctionAgent.

Yes, because LlamaIndex can save the outputs of tools like `check_white_text_on_bg` into your vector store. Your agent can then perform semantic search over past contrast checks to find reusable, compliant colors.

It gives your agent real-time verification tools. Instead of guessing if a color pair is accessible, the agent query triggers the MCP server to return the exact WCAG ratio.

You can restrict your agent to specific tools using the allowed tools filter in LlamaIndex. For example, you can limit a light-theme agent to only use `check_light_mode_surface` and `check_text_on_pure_white` from the MCP integration.

The server only receives basic color values like hex codes and RGB strings. Vinkius runs the tool in an isolated, secure sandbox that destroys the runtime state immediately after the contrast ratio is calculated.

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