unity_set_object_reference

[LEGACY] Set an object reference on a component. Prefer unity_component_set_reference (richer resolution).

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-set-object-reference.md

WHAT IT DOES

What unity_set_object_reference does on Unity MCP Server

AI agents use unity_set_object_reference 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_set_object_reference is rated Medium

This tool writes/modifies a component property (an object reference) within the Unity Editor. It is reversible (the reference can be changed back), so it falls under Write rather than Destructive. The legacy notice slightly lowers confidence but doesn't change the category. Misuse could corrupt scene component wiring but is generally recoverable.

From the tool's definition 'Set an object reference on a component' — modifies component data by assigning an object reference

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_set_object_reference 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_set_object_reference, this is the rule to start with:

unity_set_object_reference Rate-limited

unity_set_object_reference 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_set_object_reference": {
      "limits": [
        {
          "counter": "unity_set_object_reference_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_set_object_reference call is checked against it from then on.

FAQ

Questions about unity_set_object_reference

What does the unity_set_object_reference tool do? +

[LEGACY] Set an object reference on a component. Prefer unity_component_set_reference (richer resolution). 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_set_object_reference? +

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

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

Can I rate-limit unity_set_object_reference? +

Yes. Add a rate_limit block to the unity_set_object_reference 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_set_object_reference completely? +

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

unity_set_object_reference 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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