unity_undo_clear

THE RISK

Critical Risk

This tool irreversibly deletes undo history data, preventing recovery of prior editor states or modifications. While it does not delete project assets directly, it destroys the mechanism that allows undoing changes, making it a destructive operation. The blast radius is high because an AI agent clearing undo history globally could prevent users from recovering from accidental destructive actions.

From the tool's definition Tool name 'unity_undo_clear' explicitly performs clearing of undo history. Description states it 'Clear[s] undo history' which is an irreversible action that removes the user's ability to recover previous states.

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

HOW TO CONTROL UNITY_UNDO_CLEAR

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_clear:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "unity_undo_clear"
  ]
}

unity_undo_clear disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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.

RESTRICT THIS TOOL →

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EXPLORE

More Unity MCP Server tools

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All 324 Unity MCP Server tools →

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Go deeper

Critical-risk tools in Unity MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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FAQ

What does the unity_undo_clear tool do? +

Clear undo history. Can clear for a specific object or all undo history. It is categorised as a Destructive tool in the Unity MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on unity_undo_clear? +

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

unity_undo_clear is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit unity_undo_clear? +

Yes. Add a rate_limit block to the unity_undo_clear 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_clear completely? +

Set action: deny in the PolicyLayer policy for unity_undo_clear. 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_clear? +

unity_undo_clear 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.

Deterministic rules across all 324 Unity MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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324 Unity MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT UNITY_UNDO_CLEAR ON UNITY MCP SERVER DOES

// THE RISK

// HOW TO CONTROL UNITY_UNDO_CLEAR

// EXPLORE