Test two colors for WCAG accessible contrast
AI agents call are-colors-accessible 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 accessibility compliance information by analyzing color pairs. It performs a computational check and returns results (pass/fail or a contrast ratio) without creating, modifying, deleting, or executing any irreversible operations. The most severe applicable category is Read.
From the tool's definition Tool 'are-colors-accessible' tests/checks two colors for WCAG compliance. Description states it 'Test[s]' and the server enables 'checking' and 'validates' — all read-only operations that query color contrast ratios without modifying, executing external…
Attacks that exploit this kind of access
Test two colors for WCAG accessible contrast. 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 are-colors-accessible: 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.
are-colors-accessible 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 are-colors-accessible 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 are-colors-accessible. 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.
are-colors-accessible 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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