Set the selection in FreeCAD. Requires GUI mode. Args: object_names: List of object names to select. clear_existing: Whether to clear existing selection first. Defaults to True. doc_name: Document containing the objects. Uses active document if None. Returns: Dictionary with result: - success: Wh...
AI agents use set_selection 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.
This tool changes the selection state in FreeCAD, which is a reversible modification of application state rather than permanent data change or code execution. While it doesn't create/modify document geometry directly, it affects UI state and can influence subsequent operations. The reversible nature and limited scope (selection only, not document data) classify it as Write rather than Execute.
From the tool's definition Tool modifies FreeCAD's selection state via 'set_selection' with parameters to 'clear existing selection' and select objects, which alters the application's internal state reversibly.
Documented attack patterns abuse exactly the kind of access set_selection 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 set_selection:
{
"version": "1",
"default": "deny",
"tools": {
"set_selection": {
"limits": [
{
"counter": "set_selection_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_selection 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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Set the selection in FreeCAD. Requires GUI mode. Args: object_names: List of object names to select. clear_existing: Whether to clear existing selection first. Defaults to True. doc_name: Document containing the objects. Uses active document if None. Returns: Dictionary with result: - success: Whether operation was successful - selected_count: Number of objects selected. 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 set_selection: 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.
set_selection 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 set_selection 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 set_selection. 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.
set_selection 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.