unity_undo

Undo the single most recent step on Unity

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-undo.md

WHAT IT DOES

What unity_undo does on Unity MCP Server

AI agents use unity_undo 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_undo is rated Medium

Undo is a reversible operation that modifies the state of a Unity project by undoing the most recent change. While it reverses data changes rather than creating or deleting them permanently, it still constitutes a Write category action because it actively modifies the current state of the project.

From the tool's definition Tool name is 'unity_undo' and description states 'Undo the single most recent step on Unity'. Undo operations reverse modifications to project state (scripts, scenes, assets) that were made in the previous step.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_undo 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_undo, this is the rule to start with:

unity_undo Rate-limited

unity_undo 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_undo": {
      "limits": [
        {
          "counter": "unity_undo_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_undo call is checked against it from then on.

FAQ

Questions about unity_undo

What does the unity_undo tool do? +

Undo the single most recent step on Unity. 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_undo? +

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

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

Can I rate-limit unity_undo? +

Yes. Add a rate_limit block to the unity_undo 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_undo completely? +

Set action: deny in the PolicyLayer policy for unity_undo. 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_undo? +

unity_undo 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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