sim_open_url

THE RISK

High Risk

Why sim_open_url needs a policy

This tool triggers an external operation by opening a URL or deep link in a simulator, which can launch applications, trigger deep link handlers, or load web content. This constitutes execution of an external operation whose effects depend on the URL argument provided.

From the tool's definition Open a URL in the simulator (deep link or web URL)

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

POLICY

How to control sim_open_url

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

policy.json

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

sim_open_url 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 Claude Pascal 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Claude Pascal MCP Server tools

Destructive paserver_remove paserver_remove Destructive sim_uninstall Uninstall an app from a simulator. Destructive sim_shutdown Shut down a simulator. Pass udid='booted' to stop all running ones. Destructive sim_terminate Terminate a running app by bundle identifier. Execute adb_launch_app adb_launch_app Execute adb_stop_app Force-stop an app on the Android device. Execute build_dproj build_dproj Execute compile_delphi_project compile_delphi_project

All 53 Claude Pascal MCP Server 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 Claude Pascal MCP Server → 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 sim_open_url

What does the sim_open_url tool do? +

Open a URL in the simulator (deep link or web URL). It is categorised as a Execute tool in the Claude Pascal MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on sim_open_url? +

Register the Claude Pascal MCP Server MCP server in PolicyLayer and add a rule for sim_open_url: 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 Claude Pascal MCP Server. Nothing to install.

What risk level is sim_open_url? +

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

Can I rate-limit sim_open_url? +

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

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

sim_open_url is provided by the Claude Pascal MCP Server MCP server (tina4stack/claude-pascal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Claude Pascal MCP Server tool call.

Start from Claude Pascal 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 →