Add an optional design_id argument to create_node, create_edge and get_canvas so AI clients can read and populate a canvas other than the first design. Add a list_designs tool wrapping GET /api/v1/designs so those IDs are discoverable.
Backward compatible: omitting design_id preserves the existing first-design fallback in the backend (nodes.py / edges.py / canvas.py).
Co-authored-by: Cursor <cursoragent@cursor.com>
Nicola Bottini
6e3d45fddc