MCP demo v2: examples/demo/enclosure_ui_mcp.py builds the enclosure through the UI like a person (toolbar clicks, real dialogs, sketches on the model's faces, Look At and back out, orbits between features) with the parameters and their dimensions over MCP; record_v2.sh and overlay.py record it with captions (UI click / MCP call) and a drawn pointer with click ripples. Toolbar buttons, drop-down items and panel labels publish handles (toolbar:<id>, panel:<tab>:<panel>); control method ui.handles lists them

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/ui-egui/src/control.rs

@@ -252,6 +252,11 @@ pub fn handle(app: &mut SolveApp, ctx: &egui::Context, req: &ControlRequest) ->
                 _ => err("no dialog input with that index"),
             }
         }
+        "ui.handles" => {
+            // The handles drawn last frame (toolbar buttons `toolbar:<id>`, panels, browser rows…).
+            let list = crate::scenario::handles(s("prefix").unwrap_or(""));
+            ok(json!(list.into_iter().map(|(n, p)| json!({"name": n, "x": p.x, "y": p.y})).collect::<Vec<_>>()))
+        }
         "ui.at" => {
             // A scenario point: {world: [x,y,z]} | {sketch: [x,y]} | {plane: "XY"} (the middle of an
             // origin plane's square) → screen point.