FreeCAD MCP

Instructions

Args:
    doc_name: The name of the document to get the objects from.

Returns:
    A list of objects in the document and a screenshot of the document.

Implementation Reference

• src/freecad_mcp/server.py:499-522 (handler)

  The primary MCP tool handler for 'get_objects'. Retrieves all objects from the specified FreeCAD document using the RPC proxy, serializes them to JSON, and returns them with an optional screenshot of the current view.

  @mcp.tool()
  def get_objects(ctx: Context, doc_name: str) -> list[dict[str, Any]]:
      """Get all objects in a document.
      You can use this tool to get the objects in a document to see what you can check or edit.
  
      Args:
          doc_name: The name of the document to get the objects from.
  
      Returns:
          A list of objects in the document and a screenshot of the document.
      """
      freecad = get_freecad_connection()
      try:
          screenshot = freecad.get_active_screenshot()
          response = [
              TextContent(type="text", text=json.dumps(freecad.get_objects(doc_name))),
          ]
          return add_screenshot_if_available(response, screenshot)
      except Exception as e:
          logger.error(f"Failed to get objects: {str(e)}")
          return [
              TextContent(type="text", text=f"Failed to get objects: {str(e)}")
          ]

• src/freecad_mcp/server.py:81-82 (helper)

  Proxy method in the FreeCADConnection class that forwards the get_objects request to the underlying XML-RPC server.

  def get_objects(self, doc_name: str) -> list[dict[str, Any]]:
      return self.server.get_objects(doc_name)

• addon/FreeCADMCP/rpc_server/rpc_server.py:196-201 (helper)

  Core implementation in the FreeCAD RPC server. Fetches the document by name and returns a list of serialized objects using the serialize_object helper.

  def get_objects(self, doc_name):
      doc = FreeCAD.getDocument(doc_name)
      if doc:
          return [serialize_object(obj) for obj in doc.Objects]
      else:
          return []