playwright_check_contrast

THE RISK

Low Risk

Why playwright_check_contrast needs a policy

This tool performs a read-only accessibility audit check. It analyzes existing visual properties (color contrast) against WCAG standards without creating, modifying, deleting, or executing code/commands. It is a query-like diagnostic operation with no side effects, fitting the 'Read' category with low severity as misuse would only produce incorrect accessibility reports rather than cause harm or blast radius.

From the tool's definition The tool name 'playwright_check_contrast' and description 'Check color contrast ratio for WCAG compliance' indicate a diagnostic/assessment operation that reads and analyzes color properties to verify accessibility standards.

Documented attack patterns abuse exactly the kind of access playwright_check_contrast gives an agent:

POLICY

How to control playwright_check_contrast

PolicyLayer is an MCP gateway — it sits between your AI agents and RunAutomation MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for playwright_check_contrast:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "playwright_check_contrast": {}
  }
}

playwright_check_contrast is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register RunAutomation MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about playwright_check_contrast

What does the playwright_check_contrast tool do? +

Check color contrast ratio for WCAG compliance. It is categorised as a Read tool in the RunAutomation MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on playwright_check_contrast? +

Register the RunAutomation MCP Server MCP server in PolicyLayer and add a rule for playwright_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 RunAutomation MCP Server. Nothing to install.

What risk level is playwright_check_contrast? +

playwright_check_contrast is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit playwright_check_contrast? +

Yes. Add a rate_limit block to the playwright_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.

How do I block playwright_check_contrast completely? +

Set action: deny in the PolicyLayer policy for playwright_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.

What MCP server provides playwright_check_contrast? +

playwright_check_contrast is provided by the RunAutomation MCP Server MCP server (tayyabakmal1/runautomation-mcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every RunAutomation MCP Server tool call.

Start from RunAutomation MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →