playwright_list_devices

THE RISK

Low Risk

Why playwright_list_devices needs a policy

This tool performs a simple query operation that retrieves reference information about device emulation configurations. It has no capability to modify state, execute code, delete data, or access sensitive information. The blast radius of misuse is minimal—an AI agent could only obtain metadata about available device profiles, which is non-sensitive configuration information.

From the tool's definition The tool "List all available device emulations supported by Playwright. Returns device names with their viewport sizes." retrieves and lists configuration data with no side effects or state changes.

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

POLICY

How to control playwright_list_devices

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_list_devices:

policy.json

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

playwright_list_devices 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.

CAP THIS TOOL →

Free to start. No card required.

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 →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about playwright_list_devices

What does the playwright_list_devices tool do? +

List all available device emulations supported by Playwright. Returns device names with their viewport sizes. 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_list_devices? +

Register the RunAutomation MCP Server MCP server in PolicyLayer and add a rule for playwright_list_devices: 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_list_devices? +

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

Can I rate-limit playwright_list_devices? +

Yes. Add a rate_limit block to the playwright_list_devices 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_list_devices completely? +

Set action: deny in the PolicyLayer policy for playwright_list_devices. 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_list_devices? +

playwright_list_devices 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 →