unity_undo

THE RISK

Medium Risk

Why unity_undo needs a policy

This tool reverses the most recent action in Unity Editor, effectively modifying the editor state by rolling back a previous change. It is a Write-category operation because it alters the current state of data/scene in a reversible manner (it restores a prior state). It is not Destructive since it doesn't permanently delete anything, nor Execute since it doesn't run arbitrary code.

From the tool's definition Undo the last operation in Unity Editor

Documented attack patterns abuse exactly the kind of access unity_undo gives an agent:

POLICY

How to control unity_undo

PolicyLayer is an MCP gateway — it sits between your AI agents and Unity MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for unity_undo:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "unity_undo": {
      "limits": [
        {
          "counter": "unity_undo_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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.

Create a free account and register Unity MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Unity MCP Server tools

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All 324 Unity MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about unity_undo

What does the unity_undo tool do? +

Undo the last operation in Unity Editor. 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.

Enforce policy on every Unity MCP Server tool call.

Start from Unity MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →