Open an existing FreeCAD document from file. Args: path: Full path to the .FCStd file to open. Returns: Dictionary with opened document information: - name: Internal document name - label: Display label - path: File path - objects: List of object names Raises: FileNotFoundError: If the file doesn...
AI agents call open_document to retrieve information from FreeCAD Robust MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool opens/reads an existing file into FreeCAD, retrieving document information (name, label, path, objects). It does not modify data or create new content — it is a read/load operation. Slight uncertainty because opening a file could trigger macros or side effects in FreeCAD, but the description gives no indication of that.
From the tool's definition Open an existing FreeCAD document from file
Documented attack patterns abuse exactly the kind of access open_document 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 open_document:
{
"version": "1",
"default": "deny",
"tools": {
"open_document": {}
}
}open_document is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Open an existing FreeCAD document from file. Args: path: Full path to the .FCStd file to open. Returns: Dictionary with opened document information: - name: Internal document name - label: Display label - path: File path - objects: List of object names Raises: FileNotFoundError: If the file doesn't exist. ValueError: If the file is not a valid FreeCAD document. It is categorised as a Read tool in the FreeCAD Robust MCP Server MCP Server, which means it retrieves data without modifying state.
Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for open_document: 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.
open_document is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the open_document 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 open_document. 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.
open_document 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.