Get the WCAG contrast value between two colors.
AI agents call get-color-contrast to retrieve information from Accessible Color Contrast MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and calculates contrast information from provided color inputs without creating, modifying, deleting, executing code, or performing any irreversible actions. It is a simple computational query that produces informational output only.
From the tool's definition Tool description states it 'Get[s] the WCAG contrast value between two colors' — a pure data retrieval operation with no side effects.
Attacks that exploit this kind of access
Get the WCAG contrast value between two colors. It is categorised as a Read tool in the Accessible Color Contrast MCP MCP Server, which means it retrieves data without modifying state.
Register the Accessible Color Contrast MCP server in PolicyLayer and add a rule for get-color-contrast: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Accessible Color Contrast MCP. Nothing to install.
get-color-contrast is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get-color-contrast rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for get-color-contrast. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
get-color-contrast is provided by the Accessible Color Contrast MCP server (ryelle/a11y-color-contrast-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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