diff --git a/src/AcDream.Core/Selection/WorldPicker.cs b/src/AcDream.Core/Selection/WorldPicker.cs
index 1c49b70..6074373 100644
--- a/src/AcDream.Core/Selection/WorldPicker.cs
+++ b/src/AcDream.Core/Selection/WorldPicker.cs
@@ -57,7 +57,7 @@ public static class WorldPicker
 
     /// <summary>
     /// Ray-sphere intersection against each candidate's <see cref="WorldEntity.Position"/>
-    /// using a fixed 5m sphere radius. Returns the <see cref="WorldEntity.ServerGuid"/>
+    /// using a fixed 0.7 m sphere radius. Returns the <see cref="WorldEntity.ServerGuid"/>
     /// of the closest hit within <paramref name="maxDistance"/>, or null on miss.
     /// </summary>
     /// <param name="direction">
@@ -68,10 +68,22 @@ public static class WorldPicker
     /// of world meters.
     /// </param>
     /// <remarks>
+    /// <para>
     /// Entities with <c>ServerGuid == 0</c> (atlas-tier scenery, dat-hydrated
     /// statics) are skipped — they have no server-side identity and can't be
     /// the target of a Use packet. The player's own guid is skipped via
     /// <paramref name="skipServerGuid"/>.
+    /// </para>
+    /// <para>
+    /// <b>Radius history (Issue #59).</b> Started at 5 m as a forgiving default;
+    /// in practice this over-picked massively — any cursor anywhere near an
+    /// NPC selected the NPC instead of a nearby item, and "click empty
+    /// ground to deselect" was nearly impossible. Tightened to 0.7 m on
+    /// 2026-05-15 to roughly match the actual hitbox radius of humanoids +
+    /// most items. A future refinement is per-itemType radius (smaller for
+    /// tapers, bigger for shop chests) or priority sorting (items beat
+    /// NPCs at equal hit-distance).
+    /// </para>
     /// </remarks>
     public static uint? Pick(
         Vector3 origin, Vector3 direction,
@@ -79,7 +91,7 @@ public static class WorldPicker
         uint skipServerGuid,
         float maxDistance = 50f)
     {
-        const float Radius  = 5f;
+        const float Radius  = 0.7f;
         const float Radius2 = Radius * Radius;
 
         if (direction.LengthSquared() < 1e-10f) return null;