Create a .sh3d project. Lengths are in centimetres and rotations in degrees. The plan coordinate system uses y increasing downward. This tool does not create multi-level homes or add furniture beyond the optional 4-wall rectangle footprint. Example: create_project(project_path='house.sh3d', name='House', width=800, height=600)

Add a wall to a .sh3d project. Lengths are in centimetres and rotations in degrees. The plan coordinate system uses y increasing downward. This tool does not create rooms or resolve unsupported multi-wall junctions beyond the documented pairwise join model. Example: add_wall(project_path='house.sh3d', x1=0, y1=0, x2=500, y2=0)

Add a room polygon to a .sh3d project. Lengths are in centimetres and rotations in degrees. The plan coordinate system uses y increasing downward. This tool does not infer walls, repeat the closing point, or auto-split overlapping rooms. Example: add_room(project_path='house.sh3d', points=[(0,0),(500,0),(500,400),(0,400)], name='Kitchen')

Add furniture to a .sh3d project. Lengths are in centimetres and rotations in degrees. The plan coordinate system uses y increasing downward. This tool does not bind doors or windows to walls and cannot invent a missing 3D model or unsupported catalogue entry. Example: add_furniture(project_path='house.sh3d', catalog_id='eTeks#chair', x=120, y=240, rotation=90)

Add a dimension line to a .sh3d project. Lengths are in centimetres and rotations in degrees. The plan coordinate system uses y increasing downward. This tool does not snap to existing geometry or infer offsets from nearby walls. Example: add_dimension(project_path='house.sh3d', x1=0, y1=0, x2=500, y2=0, offset=20)

List editable elements in a .sh3d project. Lengths are in centimetres and rotations in degrees. The plan coordinate system uses y increasing downward. This tool does not modify the archive or canonicalize element order. Example: list_elements(project_path='house.sh3d', kinds=['walls','rooms'])

Finalize and rewrite a .sh3d project. Lengths are in centimetres and rotations in degrees. The plan coordinate system uses y increasing downward. This tool does not export OBJ, PNG, SVG, or any format other than .sh3d. Example: export_project(project_path='house.sh3d', destination_path='house-final.sh3d')

Inspect a reference .sh3d file and populate the in-process furniture catalogue cache. Lengths are in centimetres and rotations in degrees. The plan coordinate system uses y increasing downward. This tool does not modify the sample archive or copy any content into another project. Example: open_reference(sample_sh3d_path='sample.sh3d')

Validate an existing .sh3d project. Lengths are in centimetres and rotations in degrees. The plan coordinate system uses y increasing downward. This tool does not modify the archive or rewrite canonical order. Example: validate_project(project_path='house.sh3d')

Delete an editable element from a .sh3d project by id. Lengths are in centimetres and rotations in degrees. The plan coordinate system uses y increasing downward. This tool does not delete unsupported tags or repair geometry beyond clearing inbound wall join references to a deleted wall. Example: delete_element(project_path='house.sh3d', element_id='wall2')