unity_execute_code

SERVERUnity MCP Server SOURCEanklebreaker-studio/unity-mcp-server

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/anklebreaker-studio-unity-mcp-server/unity-execute-code.md

WHAT IT DOES

What unity_execute_code does on Unity MCP Server

AI agents invoke unity_execute_code to trigger actions in Unity MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why unity_execute_code is rated High

This tool permits execution of arbitrary code within a running application context with full API access. An AI agent could use this to execute malicious scripts, delete files, modify projects, exfiltrate data, or compromise the development environment. The 'arbitrary' qualifier and unrestricted API access elevate this to critical severity.

From the tool's definition Tool explicitly allows 'Execute arbitrary C# code inside the Unity Editor' with 'access to all Unity APIs'. The description directly indicates code execution capability without restrictions on what that code can do.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_execute_code safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Unity MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For unity_execute_code, this is the rule to start with:

unity_execute_code Rate-limited

unity_execute_code 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Unity MCP Server, apply this rule, and every unity_execute_code call is checked against it from then on.

FAQ

Questions about unity_execute_code

What does the unity_execute_code tool do? +

Execute arbitrary C# code inside the Unity Editor. The code runs in the editor context with access to all Unity APIs. Useful for one-off operations, queries, and automation. Return values are serialized to JSON. It is categorised as a Execute tool in the Unity 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 unity_execute_code? +

Register the Unity MCP Server MCP server in PolicyLayer and add a rule for unity_execute_code: 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 Unity MCP Server. Nothing to install.

What risk level is unity_execute_code? +

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

Can I rate-limit unity_execute_code? +

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

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

unity_execute_code is provided by the Unity MCP Server MCP server (anklebreaker-studio/unity-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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