unity_mppm_start

Start the currently active scenario. By default also enters Play mode on the main editor

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-mppm-start.md

WHAT IT DOES

What unity_mppm_start does on Unity MCP Server

AI agents invoke unity_mppm_start 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_mppm_start is rated High

This tool executes a scenario in the Unity editor's Play mode, which runs arbitrary game code/logic. While not destructive by itself, it triggers execution of potentially complex game logic whose side effects are unpredictable and depend on the scenario's contents.

From the tool's definition Tool name 'unity_mppm_start' combined with description stating it 'Start[s] the currently active scenario' and 'enters Play mode on the main editor'.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_mppm_start 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_mppm_start, this is the rule to start with:

unity_mppm_start Rate-limited

unity_mppm_start 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_mppm_start": {
      "limits": [
        {
          "counter": "unity_mppm_start_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_mppm_start call is checked against it from then on.

FAQ

Questions about unity_mppm_start

What does the unity_mppm_start tool do? +

Start the currently active scenario. By default also enters Play mode on the main editor. 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_mppm_start? +

Register the Unity MCP Server MCP server in PolicyLayer and add a rule for unity_mppm_start: 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_mppm_start? +

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

Can I rate-limit unity_mppm_start? +

Yes. Add a rate_limit block to the unity_mppm_start 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_mppm_start completely? +

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

unity_mppm_start 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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