AI agents use undo to create or update resources in O3de — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your O3de environment.
While undo operations reverse prior changes, they are fundamentally Write operations because they modify editor state reversibly. The tool does not create permanent, irreversible deletions (which would be Destructive) nor does it execute arbitrary code.
From the tool's definition Tool is named 'undo' with description 'Undo the last editor action.' This reverses a prior modification to the editor state, making it a reversible write operation that modifies the O3DE project state.
Documented attack patterns abuse exactly the kind of access undo gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and O3de, and nothing reaches the server without passing your rules. This is the rule we recommend for undo:
{
"version": "1",
"default": "deny",
"tools": {
"undo": {
"limits": [
{
"counter": "undo_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}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.
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Undo the last editor action. It is categorised as a Write tool in the O3de MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the O3de MCP server in PolicyLayer and add a rule for 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 O3de. Nothing to install.
undo is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the 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.
Set action: deny in the PolicyLayer policy for 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.
undo is provided by the O3de MCP server (nickschuetz/o3de-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from O3de, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
30 O3de tools catalogued and risk-classified — across an index of 43,000+ MCP servers.