Zovo Palette Lab

by theluckystrike · remote · no sign-in to list tools · v1.0.0 · published by GitHub user theluckystrike

WCAG contrast & palettes

Changes · 3

Compare Registry entry

3 tools: 3 change things.

Scanned Oct 22, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things3Claude Code: ask: see these tools
Only reads0Claude Code: allow

1 check matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http contrast-checker https://contrast-checker.zovo.one/mcp

Findings

Matches of fixed checks, with the text they matched.

1 warn

Warngenerate_accessible_palette
The server marks "generate_accessible_palette" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "generate_accessible_palette" says "generate": a word for a change.
What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

3 tools

Changes things 3Creates or changes something that can be changed back.Claude Code: ask

check_color_contrastUse this when the user wants to know whether a text, icon or border colour has enough contrast against a background: a WCAG contrast checker for one colour pair (e.g.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Use this when the user wants to know whether a text, icon or border colour has enough contrast against a background: a WCAG contrast checker for one colour pair (e.g. "does white text on #F59E0B pass WCAG AA", "contrast ratio of #767676 on white", "what text color for this background"). Returns the computed WCAG 2.x ratio (truncated to 2 decimals, rounded down), AA/AAA results for normal text, large text and UI components, a verdict for a given font size, APCA Lc as draft information, and the nearest passing colours for AA and AAA (darker and lighter, same OKLCH hue and chroma). Accepts hex, 8-digit hex with alpha, rgb(), hsl(), hwb(), lab(), lch(), oklab(), oklch(), color(display-p3 ...) and CSS colour names; wide-gamut colours are clipped to sRGB with a note. Does not read colours from images or web pages, resolve CSS variables or currentColor, or check gradients as a whole (check each stop). For 3 or more colours use check_palette_contrast.
Annotations the server declares
- title: Check color contrast
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: false
- idempotentHint: true
check_palette_contrastUse this when the user has a colour palette (2 to 12 colours) and wants to know which combinations are accessible: "check contrast of my color palette", "which of these colors can …No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Use this when the user has a colour palette (2 to 12 colours) and wants to know which combinations are accessible: "check contrast of my color palette", "which of these colors can I use for text", "accessible color palette checker". Returns the full pairwise WCAG 2.x contrast matrix (ratios truncated, rounded down), which pairs pass AA/AAA for text or 3:1 for large text and UI, and a recommended text colour for each background (a palette colour that passes AA, otherwise black or white). Does not generate new colours; use generate_accessible_palette for a tonal scale and check_color_contrast for fixes to one pair.
Annotations the server declares
- title: Check palette contrast
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: false
- idempotentHint: true
generate_accessible_paletteUse this when the user wants an accessible colour scale or palette built from one colour: "color palette generator from hex", "generate a 50-950 scale from #1E6FD9", "tailwind colo…1 finding
Why it is in this group
- The name "generate_accessible_palette" says "generate": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "generate_accessible_palette" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "generate_accessible_palette" says "generate": a word for a change.
  What this check looks for
Description, as the server wrote it
Use this when the user wants an accessible colour scale or palette built from one colour: "color palette generator from hex", "generate a 50-950 scale from #1E6FD9", "tailwind color palette generator", "accessible color palette for my website". Builds an 11-step 50-950 tonal scale in OKLCH with the base hue, where 50-400 pass AA with black text, 500 passes AA with both white and black text, 600 passes AA with white text and 700-950 pass AAA with white text, and each ratio is reported. Returns CSS custom properties and a Tailwind config as downloads. Does not pick colours by mood or brand meaning and does not extract palettes from images.
Annotations the server declares
- title: Generate accessible palette
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: false
- idempotentHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http contrast-checker https://contrast-checker.zovo.one/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__contrast-checker__check_color_contrast",
      "mcp__contrast-checker__check_palette_contrast",
      "mcp__contrast-checker__generate_accessible_palette"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as contrast-checker. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.theluckystrike/contrast-checker/changes.xml

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Source: MCP Registry. Synced Oct 22, 2026, 06:20 UTC.

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