diff --git a/internal/plugin/plugin_test.go b/internal/plugin/plugin_test.go
index 87b1744..f6d1a73 100644
--- a/internal/plugin/plugin_test.go
+++ b/internal/plugin/plugin_test.go
@@ -2,6 +2,8 @@ package plugin
 
 import (
 	"testing"
+
+	sdk "gitcode.com/JianFeeeee/HomeAgent/internal/sdk"
 )
 
 func TestExtractDescription(t *testing.T) {
@@ -195,3 +197,8 @@ A tool with no parameters`
 		t.Errorf("expected no params, got %d", len(props))
 	}
 }
+
+func TestPluginManagerInterfaceReloadOne(t *testing.T) {
+	// 编译期契约：Registry 必须实现 PluginManager（含 ReloadOne 单插件重载）。
+	var _ sdk.PluginManager = (*Registry)(nil)
+}