diff --git a/mseries/SDK-CORNERS.md b/mseries/SDK-CORNERS.md
index 19d412b..be906ff 100644
--- a/mseries/SDK-CORNERS.md
+++ b/mseries/SDK-CORNERS.md
@@ -19,8 +19,8 @@ Logical pixels, shared by SDK apps and meant to be read by the compositor:
 
 | Token | Value | Used for |
 |---|---:|---|
-| `screen` | 14 | The built-in display's physical corner (the mask) |
-| `window` | 12 | Floating window outline and title band |
+| `screen` | 20 | The built-in display's physical corner (the mask) |
+| `window` | 20 | Floating window outline and title band |
 | `popover` | 10 | Menus, popovers |
 | `card` | 12 | Cards, editors, the Transcript bubbles' parent shapes |
 | `bubble` | 14 | Chat bubbles |
@@ -33,6 +33,11 @@ Logical pixels, shared by SDK apps and meant to be read by the compositor:
 has a larger radius than the display (`window <= screen`; tested). Maximized and fullscreen SDK windows have radius 0 in their own
 stylesheet because an app cannot know whether it is on the built-in display or a square external one; the compositor decides (below).
 
+> **2026-10-27:** `screen` and `window` are now 20, the value the owner had already set by hand for the display mask, the
+> window clip and the GTK theme on 2026-10-22 (the tokens said 14 and 12, so three different radii were in use). The
+> compositor draws the screen mask and clips windows from these same tokens; 20 is still a calibration starting point,
+> not a measured panel radius. Mirrors techmore/ElementaryOS_MSeries#641, where the compositor reads these tokens.
+
 ## 3. Compositor contract (not built in the Rust compositor)
 
 The compositor is the only layer that can make every app, including third-party and client-side-decorated windows, follow the curve.
diff --git a/rust/msdk/data/tokens.json b/rust/msdk/data/tokens.json
index b66a186..e0987cc 100644
--- a/rust/msdk/data/tokens.json
+++ b/rust/msdk/data/tokens.json
@@ -70,8 +70,8 @@
     "bubble_alpha": 0.22
   },
   "corners": {
-    "screen": 14,
-    "window": 12,
+    "screen": 20,
+    "window": 20,
     "popover": 10,
     "card": 12,
     "bubble": 14,