Sketch commands return the ids of the points, curves, constraints and dimensions they create as created: {points, curves, constraints, dimensions}, worked out in Session::execute from the sketch before and after, so a script can dimension and constrain new geometry right away; ids stay stable and are not reused after a delete (undo rewinds the counters with the design). The MCP execute tool describes the field

crates/engine/src/cmd/mod.rs

@@ -2,6 +2,13 @@
 //! `sketch.rectangle.two_point`); the toolbar placement (`tab`, `panel`) follows the familiar
 //! Design workspace layout. Ids used before the rename still resolve (`legacy_ids`).
 
+/// The params-doc note of every command that adds sketch geometry (see `sketch::created`).
+macro_rules! created_doc {
+    () => {
+        ". Returns created: {points, curves, constraints, dimensions}: the ids of what it added (stable and never reused: usable right away in sketch.dimension, sketch.constraint.*, sketch.delete…)"
+    };
+}
+
 mod browser;
 mod clipboard;
 mod component;
@@ -27,6 +34,7 @@ mod parameters;
 mod plastic;
 mod sheet;
 mod sketch;
+pub(crate) use sketch::created as sketch_created;
 mod sketch_3d;
 mod sketch_canvas;
 mod sketch_constraints;