3 files changed, 41 insertions, 1 deletions
diff --git a/internal/ui/keyhandlers_test.go b/internal/ui/keyhandlers_test.go
index d603aa1..d8a831c 100644
--- a/internal/ui/keyhandlers_test.go
+++ b/internal/ui/keyhandlers_test.go
@@ -35,3 +35,13 @@ func TestSharedKeyBindingsHaveUsableMetadata(t *testing.T) {
 		}
 	}
 }
+
+func TestAgentFilterHotkeyValidationRejectsSharedKeyBindings(t *testing.T) {
+	for _, binding := range sharedKeyBindings {
+		for _, key := range binding.keys {
+			if err := validateAgentFilterHotkey(key); err == nil {
+				t.Fatalf("shared key binding %q can be set as the agent filter hotkey", key)
+			}
+		}
+	}
+}
diff --git a/internal/ui/table.go b/internal/ui/table.go
index 2a04441..949abbb 100644
--- a/internal/ui/table.go
+++ b/internal/ui/table.go
@@ -1409,12 +1409,28 @@ func validateAgentFilterHotkey(key string) error {
 	if key == "" {
 		return nil
 	}
-	if _, ok := reservedAgentHotkeys[key]; ok {
+	if sharedKeyBindingContains(key) || reservedAgentHotkeyContains(key) {
 		return fmt.Errorf("agent hotkey %q conflicts with an existing command", key)
 	}
 	return nil
 }
 
+func sharedKeyBindingContains(key string) bool {
+	for _, binding := range sharedKeyBindings {
+		for _, candidate := range binding.keys {
+			if candidate == key {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func reservedAgentHotkeyContains(key string) bool {
+	_, ok := reservedAgentHotkeys[key]
+	return ok
+}
+
 func normalizeAgentFilterHotkey(key string) string {
 	key = strings.TrimSpace(key)
 	if key == "" || len(key) == 1 {
diff --git a/internal/ui/table_test.go b/internal/ui/table_test.go
index c102b82..0920deb 100644
--- a/internal/ui/table_test.go
+++ b/internal/ui/table_test.go
@@ -1603,6 +1603,20 @@ func TestAgentFilterHotkeyRejectsUppercaseNamedKeyCollision(t *testing.T) {
 	}
 }
 
+func TestAgentFilterHotkeyRejectsShellPromptSharedKeys(t *testing.T) {
+	for _, key := range []string{":", ";"} {
+		t.Run(key, func(t *testing.T) {
+			var m Model
+			if err := m.SetAgentFilterHotkey(key); err == nil {
+				t.Fatalf("expected collision for shell prompt hotkey %q", key)
+			}
+			if got := m.agentFilterHotkeyLabel(); got != "3" {
+				t.Fatalf("colliding shell prompt hotkey changed label: got %q want %q", got, "3")
+			}
+		})
+	}
+}
+
 func TestAgentFilterHotkeyCollisionIsRejected(t *testing.T) {
 	tmp := t.TempDir()
 	taskPath := filepath.Join(tmp, "task")