How to Check Color Contrast with OpenClaw
Check color accessibility contrast with OpenClaw and ToolRouter. Run accessibility audits across full color systems at batch scale.
Tool
OpenClaw handles contrast checking at the scale of a comprehensive accessibility audit — running every meaningful combination in a design system through WCAG compliance checks and producing a complete report.
Connect ToolRouter to OpenClaw
1Install the CLI
npm install -g toolrouter-mcp2Call tools directly from OpenClaw
toolrouter-mcp call web-search search --query "AI tools"
toolrouter-mcp toolsSteps
Once connected (see setup above), use the Color Tools tool:
- Define the full set of foreground and background color pairs to check.
- Run check_contrast across all pairs.
- Organize results by compliance level — AAA pass, AA pass, fail — with the contrast ratio for each.
- Export the accessibility audit report for the compliance and design team.
Example Prompt
Try this with OpenClaw using the Color Tools tool
Use color-tools to run WCAG contrast checks on all 40 foreground-background combinations in our design system. Return a report organized by: AAA passes, AA passes, and failures. For each failure include the contrast ratio and how far it is from the AA threshold.
Tips
- Audit the full matrix even if you think most combinations will pass — accessibility failures are often in combinations that seemed low-risk.
- Include the shortfall from AA threshold in failure reports — a ratio of 3.8:1 is almost passing, a ratio of 1.5:1 needs a complete color change.
- Run the audit again after any palette update — it is fast and catches regression before it reaches production.