unity_undo_last

Revert the most recent undoable MCP action as a whole (create/edit/boolean, not one internal step — each write runs in its own named undo group). With agentId, targets that agent

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-last.md

WHAT IT DOES

What unity_undo_last does on Unity MCP Server

AI agents use unity_undo_last 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_last is rated Medium

While undo operations modify state, they are reversible and restorative rather than destructive. The tool undoes previous write actions and can itself be undone (implied by MCP undo group semantics), making it a Write category action with low severity since it restores rather than destroys data.

From the tool's definition Tool name 'unity_undo_last' and description explicitly states it reverts/undoes 'the most recent undoable MCP action' — it reverses write operations (create/edit/boolean) that were previously performed, making it a Write operation that restores prior state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_undo_last 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_last, this is the rule to start with:

unity_undo_last Rate-limited

unity_undo_last 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_last": {
      "limits": [
        {
          "counter": "unity_undo_last_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_last call is checked against it from then on.

FAQ

Questions about unity_undo_last

What does the unity_undo_last tool do? +

Revert the most recent undoable MCP action as a whole (create/edit/boolean, not one internal step — each write runs in its own named undo group). With agentId, targets that agent. 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_last? +

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

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

Can I rate-limit unity_undo_last? +

Yes. Add a rate_limit block to the unity_undo_last 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_last completely? +

Set action: deny in the PolicyLayer policy for unity_undo_last. 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_last? +

unity_undo_last 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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