unity_select_instance

Select the Unity Editor instance this session targets; subsequent unity_* calls route there.

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

Medium RISK CLASS

Category Write

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-select-instance.md

WHAT IT DOES

What unity_select_instance does on Unity MCP Server

AI agents use unity_select_instance to create or update resources in Unity MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Unity MCP Server environment.

RISK

Why unity_select_instance is rated Medium

This tool changes the routing/targeting of the current session to a specific Unity Editor instance. It modifies session state (which instance is targeted), which is a reversible write operation.

From the tool's definition Select the Unity Editor instance this session targets; subsequent unity_* calls route there.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_select_instance 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_select_instance, this is the rule to start with:

unity_select_instance Rate-limited

unity_select_instance stays usable, but capped: an agent stuck in a loop can't make hundreds of changes 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_select_instance": {
      "limits": [
        {
          "counter": "unity_select_instance_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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_select_instance call is checked against it from then on.

FAQ

Questions about unity_select_instance

What does the unity_select_instance tool do? +

Select the Unity Editor instance this session targets; subsequent unity_* calls route there. It is categorised as a Write tool in the Unity MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on unity_select_instance? +

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

unity_select_instance is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit unity_select_instance? +

Yes. Add a rate_limit block to the unity_select_instance 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_select_instance completely? +

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

unity_select_instance 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

More on Unity MCP Server, and thousands of servers like it.

This server

All 338 Unity MCP Server tools →

Across the catalogue

The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →