Undo the last operation. Args: doc_name: Document to undo in. Uses active document if None. Returns: Dictionary with result: - success: Whether undo was performed - can_undo: Whether more undos are available
AI agents use undo to create or update resources in FreeCAD Robust MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your FreeCAD Robust MCP Server environment.
Undo is categorized as Write rather than Destructive because it is reversible and maintains data integrity—the user can redo the undone operation. While it modifies document state, it does so in a controlled, non-destructive manner. Severity is medium because misuse could cause loss of user work or confusion in a collaborative editing scenario, but the operation can be undone itself.
From the tool's definition Tool performs 'Undo the last operation' which reverses the most recent change in a document. This is a write-class operation that modifies document state by rolling back changes, though it is reversible (can be countered with redo).
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 FreeCAD Robust MCP Server, 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.
Free to start. No card required.
Undo the last operation. Args: doc_name: Document to undo in. Uses active document if None. Returns: Dictionary with result: - success: Whether undo was performed - can_undo: Whether more undos are available. It is categorised as a Write tool in the FreeCAD Robust MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the FreeCAD Robust MCP Server 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 FreeCAD Robust MCP Server. 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 FreeCAD Robust MCP Server MCP server (spkane/freecad-addon-robust-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 152 FreeCAD Robust MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
152 FreeCAD Robust MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.