Verify WCAG accessibility compliance
AI agents call check_contrast to retrieve information from MCP Color Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and validates contrast information against WCAG guidelines. It performs analysis and returns compliance results with no side effects, data modification, code execution, or irreversible actions. The operation is purely informational—checking whether colors meet accessibility thresholds. This is a straightforward Read category action.
From the tool's definition Tool name 'check_contrast' and description 'Verify WCAG accessibility compliance' indicate a read-only operation that analyzes color contrast ratios against accessibility standards without modifying, executing, or deleting any data.
Attacks that exploit this kind of access
Verify WCAG accessibility compliance. It is categorised as a Read tool in the MCP Color Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Color Server MCP server in PolicyLayer and add a rule for check_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 MCP Color Server. Nothing to install.
check_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 check_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 check_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.
check_contrast is provided by the MCP Color Server MCP server (keyurgolani/colormcp). 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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