mobile_mode

THE RISK

High Risk

Why mobile_mode needs a policy

This tool modifies the browser's viewport configuration by toggling mobile emulation mode. It triggers an external browser operation (changing device emulation settings via DevTools Protocol) that affects subsequent browser behavior.

From the tool's definition Toggles mobile viewport (iPhone X dimensions)

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

POLICY

How to control mobile_mode

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mobile_mode": {
      "limits": [
        {
          "counter": "mobile_mode_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

mobile_mode stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

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

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Chrome MCP Docker tools

Execute navigate Navigates to a URL and waits for network idle. Execute wait_for_selector Waits for an element to appear in the DOM. Execute click Clicks an element identified by CSS selector. Execute scroll Scrolls the page. Use x,y coordinates OR selector to scroll into view. Write type Types text into an input field. Read get_computed_styles Returns the computed CSS styles for an element (essential for UI debugging). Read get_console_logs Returns captured console logs (errors, warnings, info). Useful for debugging JS issues. Read get_network_errors Returns a list of failed network requests.

All 10 Chrome MCP Docker tools →

Execute tools on other servers

Android Forensics ADB MCP Server adb_shell_command EMBA-MCP run_emba_scan Frida Game Hacking MCP remove_breakpoint Procmon request_elevation

Go deeper

High-risk tools in Chrome MCP Docker → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mobile_mode

What does the mobile_mode tool do? +

Toggles mobile viewport (iPhone X dimensions). It is categorised as a Execute tool in the Chrome MCP Docker MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on mobile_mode? +

Register the Chrome MCP Docker MCP server in PolicyLayer and add a rule for mobile_mode: 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 Chrome MCP Docker. Nothing to install.

What risk level is mobile_mode? +

mobile_mode is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit mobile_mode? +

Yes. Add a rate_limit block to the mobile_mode 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 mobile_mode completely? +

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

mobile_mode is provided by the Chrome MCP Docker MCP server (null-runner/chrome-mcp-docker). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Chrome MCP Docker tool call.

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

CHECK YOUR STACK →