Undo the last operation in AutoCAD (equivalent to Ctrl+Z)
AI agents use undo_last_operation to create or update resources in AutoCAD MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AutoCAD MCP Server environment.
The undo_last_operation tool reverses previously applied changes, making it a Write-category action (reversible modification of state) rather than Destructive. While it modifies the drawing state by reverting changes, those changes are not permanently lost—the undone operation can be redone.
From the tool's definition Tool description states 'Undo the last operation in AutoCAD (equivalent to Ctrl+Z)'. This is a reversible operation that reverts the most recent modification without permanently destroying data.
Documented attack patterns abuse exactly the kind of access undo_last_operation gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AutoCAD MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for undo_last_operation:
{
"version": "1",
"default": "deny",
"tools": {
"undo_last_operation": {
"limits": [
{
"counter": "undo_last_operation_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}undo_last_operation 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 operation in AutoCAD (equivalent to Ctrl+Z). It is categorised as a Write tool in the AutoCAD MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the AutoCAD MCP Server MCP server in PolicyLayer and add a rule for undo_last_operation: 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 AutoCAD MCP Server. Nothing to install.
undo_last_operation 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_last_operation 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_last_operation. 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_last_operation is provided by the AutoCAD MCP Server MCP server (thepiruthvirajan/autocad-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 21 AutoCAD MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
21 AutoCAD MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.