MCP server

ContrastKit

dev.workers.mike-tusa.contrastkit/contrastkit

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

WCAG color contrast checks, nearest accessible color, CSS color conversion and palette pair checks.

Website

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

4

Token cost

About 995 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http contrastkit https://contrastkit.mike-tusa.workers.dev/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.contrastkit]
url = "https://contrastkit.mike-tusa.workers.dev/mcp"

Gemini CLI

{"mcpServers":{"contrastkit":{"httpUrl":"https://contrastkit.mike-tusa.workers.dev/mcp"}}}

Cursor

{"mcpServers":{"contrastkit":{"url":"https://contrastkit.mike-tusa.workers.dev/mcp"}}}

VS Code

{"servers":{"contrastkit":{"type":"http","url":"https://contrastkit.mike-tusa.workers.dev/mcp"}}}

Antigravity

agy mcp add contrastkit https://contrastkit.mike-tusa.workers.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"contrastkit","server_url":"https://contrastkit.mike-tusa.workers.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"contrastkit","server_url":"https://contrastkit.mike-tusa.workers.dev/mcp"}

Tools

• check_contrast ~243 tokens
  Compute the WCAG 2.x contrast ratio between a text (foreground) color and a background color, with pass/fail for AA, AA large text, AAA, AAA large text and non-text UI (3:1). Handles translucent colors. Read-only. Same engine as GET /api/contrast.
• check_palette ~249 tokens
  Contrast ratio for every pair of 2 to 12 colors (up to 66 pairs), highest first, each flagged against the chosen WCAG level. Use it to see which brand colors can be used together for text. Read-only. Same engine as GET /api/palette.
• convert_color ~158 tokens
  Convert a CSS color to hex, rgb() and hsl(), with its relative luminance, its contrast on white and on black, and the better text color (black or white) to put on it. Read-only. Same engine as GET /api/convert.
• suggest_accessible_color ~345 tokens
  For a failing color pair, find the closest color (same hue and saturation, lightness changed as little as possible) that meets the chosen WCAG level. Adjust the foreground (default), the background, or both (best first). Read-only. Same engine as GET /api/suggest.

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