unity_list_instances

List running Unity Editor instances (name, port, version, clone flag, pluginVersion).

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

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/anklebreaker-studio-unity-mcp-server/unity-list-instances.md

WHAT IT DOES

What unity_list_instances does on Unity MCP Server

AI agents call unity_list_instances to retrieve information from Unity MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why unity_list_instances is rated Low

This is a straightforward read operation that queries and returns information about currently running Unity Editor instances. It has no capability to create, modify, delete, or execute operations. The information returned is metadata that could be useful for monitoring or discovery, but poses minimal security risk as a standalone tool.

From the tool's definition Tool name 'unity_list_instances' and description 'List running Unity Editor instances' indicates a query/retrieval operation with no side effects. Returns metadata (name, port, version, clone flag, pluginVersion) without modifying any state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_list_instances 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_list_instances, this is the rule to start with:

unity_list_instances Allowed

unity_list_instances is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "unity_list_instances": {}
  }
}

ALLOW ONLY 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_list_instances call is checked against it from then on.

FAQ

Questions about unity_list_instances

What does the unity_list_instances tool do? +

List running Unity Editor instances (name, port, version, clone flag, pluginVersion). It is categorised as a Read tool in the Unity MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on unity_list_instances? +

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

unity_list_instances is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit unity_list_instances? +

Yes. Add a rate_limit block to the unity_list_instances 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_list_instances completely? +

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

unity_list_instances 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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