check-contrast

check-contrast is a command for coding agents from rohitg00/awesome-claude-code-toolkit. It costs 0 tokens per session (320 once invoked), scanned A, original, Apache-2.0.

A command that checks whether text, interface controls, and graphics have enough color difference to meet Web Content Accessibility Guidelines (WCAG) requirements.

In plain words
What is it for?
Use it to audit CSS and themes, calculate contrast ratios, identify failing elements, and produce a pass/fail accessibility report.
Why use it?
It finds color combinations that may be difficult to read or see, including problems in light mode, dark mode, focus indicators, images, and transparent colors.

Command

Part of the color-contrast plugin — 2 commands shipped together

About the project

Awesome Claude Code Toolkit is a curated collection of extensions and configuration for Claude Code, including agents, skills, commands, plugins, hooks, rules, templates, MCP configurations, and companion apps. It is for Claude Code users who want ready-made workflows and integrations for different development tasks. The catalogue add-ons are selected components from this toolkit.

rohitg00/awesome-claude-code-toolkit · 2,587 stars · on GitHub

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/rohitg00/awesome-claude-code-toolkit/check-contrast
Clone the repo
git clone --depth 1 https://github.com/rohitg00/awesome-claude-code-toolkit

Or install color-contrast, the plugin that ships this one along with the rest of its 2 commands.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for check-contrast

README.md
[![agentmods](https://agentmods.dev/badge/commands/rohitg00/awesome-claude-code-toolkit/check-contrast.svg)](https://agentmods.dev/commands/rohitg00/awesome-claude-code-toolkit/check-contrast)
Your own site
<a href="https://agentmods.dev/commands/rohitg00/awesome-claude-code-toolkit/check-contrast"><img src="https://agentmods.dev/badge/commands/rohitg00/awesome-claude-code-toolkit/check-contrast.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 320 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00320
Opus 5 $0.00000 $0.00160
Sonnet 5 $0.00000 $0.00064
Haiku 4.5 $0.00000 $0.00032

Measured yesterday against content hash 7ac8a84fac24, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

check-contrast scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/color-contrast/commands/check-contrast.md · 29 lines

What it actually says

/check-contrast - Check Color Contrast

Check color contrast ratios against WCAG accessibility requirements.

Steps

  1. Scan CSS, SCSS, and styled-components for all text color and background color pairs
  2. Resolve CSS custom properties and theme variables to actual color values
  3. Calculate the luminance contrast ratio for each foreground/background pair
  4. Check against WCAG 2.1 requirements: 4.5:1 for normal text, 3:1 for large text (18px+ or 14px+ bold)
  5. Check non-text contrast for UI components and graphical objects: 3:1 ratio
  6. Identify text on images or gradients that may have insufficient contrast
  7. Check focus indicator contrast against adjacent colors
  8. Verify contrast in both light and dark themes if the app supports them
  9. Flag transparent or semi-transparent colors that reduce effective contrast
  10. Generate a report: element, foreground color, background color, ratio, pass/fail
  11. Show the total pass/fail count and compliance percentage
  12. Highlight the worst offenders that need immediate attention

Rules

  • Test both light and dark mode color schemes
  • Account for opacity when calculating effective contrast
  • Large text threshold: 18px regular or 14px bold
  • Do not flag disabled elements as they are exempt from contrast requirements
  • Check placeholder text contrast (should meet 4.5:1 even though many sites skip this)
  • Consider adjacent color contrast for interactive component boundaries
  • Report all unique color pairs, not every instance
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 29 lines · 0 tokens per session scan A 7ac8a84fac24

Subscribe to this mod's changes

check-contrast is a command published in the GitHub repository rohitg00/awesome-claude-code-toolkit (2,587 stars, last pushed 3mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 320 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.