unity_play_mode

Control Unity Editor play mode: enter play, pause, or stop.

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-play-mode.md

WHAT IT DOES

What unity_play_mode does on Unity MCP Server

AI agents invoke unity_play_mode 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_play_mode is rated High

This tool triggers execution of the Unity Editor's play mode, causing the engine to run/simulate game logic. It is an active operation that triggers external execution within the Unity environment. It does not permanently delete data but can cause side effects depending on what scripts and logic run during play mode.

From the tool's definition Control Unity Editor play mode: enter play, pause, or stop.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_play_mode 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_play_mode, this is the rule to start with:

unity_play_mode Rate-limited

unity_play_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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "unity_play_mode": {
      "limits": [
        {
          "counter": "unity_play_mode_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_play_mode call is checked against it from then on.

FAQ

Questions about unity_play_mode

What does the unity_play_mode tool do? +

Control Unity Editor play mode: enter play, pause, or stop. 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_play_mode? +

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

What risk level is unity_play_mode? +

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

Can I rate-limit unity_play_mode? +

Yes. Add a rate_limit block to the unity_play_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 unity_play_mode completely? +

Set action: deny in the PolicyLayer policy for unity_play_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 unity_play_mode? +

unity_play_mode 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.

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