device_sim_generate_proxy

THE RISK

High Risk

Why device_sim_generate_proxy needs a policy

The tool generates and likely writes/executes a Python proxy class for a Verse device in a live editor. This goes beyond a simple read or write, as it involves running a code generation process that produces executable artifacts within the editor context. The blast radius is moderate since misuse could inject unexpected proxy code into the project.

From the tool's definition "Generate a Python simulation proxy class" — this triggers code generation (execution of a generation process) targeting a live UEFN editor environment

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

POLICY

How to control device_sim_generate_proxy

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

policy.json

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

device_sim_generate_proxy 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 Uefn — 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

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All 143 Uefn tools →

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Go deeper

High-risk tools in Uefn → 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 device_sim_generate_proxy

What does the device_sim_generate_proxy tool do? +

Generate a Python simulation proxy class for the selected Verse device. It is categorised as a Execute tool in the Uefn MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on device_sim_generate_proxy? +

Register the Uefn MCP server in PolicyLayer and add a rule for device_sim_generate_proxy: 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 Uefn. Nothing to install.

What risk level is device_sim_generate_proxy? +

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

Can I rate-limit device_sim_generate_proxy? +

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

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

device_sim_generate_proxy is provided by the Uefn MCP server (quangdang46/uefn-verse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Uefn tool call.

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

CHECK YOUR STACK →