diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c1bd5f..4dee733 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,11 @@ submodule.
   shows ⚠ so the warning never depends on color alone, and screen readers announce it. Cloud models,
   which manage their own window, show their token count.
 
+### Fixed
+- **The "Add tag" button is fully visible again.** In the Manage tags dialog, the name box was a
+  fixed width, which pushed the button past the dialog's edge and cut it off. The name box now
+  shrinks to fit, so the color picker and the whole button always fit on the row.
+
 ## [0.15.0] — 2026-09-10
 
 **A new AI foundation, plans you can resume, and more ways to work alongside your agents.**
diff --git a/src/MandoCode.Desktop/MainWindow.Tags.cs b/src/MandoCode.Desktop/MainWindow.Tags.cs
index 50080eb..c5b33c9 100644
--- a/src/MandoCode.Desktop/MainWindow.Tags.cs
+++ b/src/MandoCode.Desktop/MainWindow.Tags.cs
@@ -129,7 +129,6 @@ private async Task ShowTagManagerAsync(TagScope scope, string title)
         var input = new TextBox
         {
             PlaceholderText = "New tag (for example: database)",
-            MinWidth = 300,
         };
         var list = new ListView
         {
@@ -186,7 +185,14 @@ void Refresh()
             TextWrapping = TextWrapping.Wrap,
             Opacity = 0.7,
         });
-        var addRow = new StackPanel { Orientation = Orientation.Horizontal, Spacing = 8 };
+        // The dialog caps its content near 500px, so the name box takes whatever the color picker
+        // and button leave. A horizontal StackPanel sized the box first and pushed the button off the edge.
+        var addRow = new Grid { ColumnSpacing = 8 };
+        addRow.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
+        addRow.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto });
+        addRow.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto });
+        Grid.SetColumn(color, 1);
+        Grid.SetColumn(add, 2);
         addRow.Children.Add(input);
         addRow.Children.Add(color);
         addRow.Children.Add(add);