diff --git a/memos/commands.py b/memos/commands.py
index 11053f0..1064be6 100644
--- a/memos/commands.py
+++ b/memos/commands.py
@@ -273,5 +273,22 @@ def create(name: str, webhook_url: str, description: str = ""):
         print(f"Failed to create plugin: {response.status_code} - {response.text}")
 
 
+@plugin_app.command("bind")
+def bind(
+    library_id: int = typer.Option(..., "--lib", help="ID of the library"),
+    plugin_id: int = typer.Option(..., "--plugin", help="ID of the plugin"),
+):
+    response = httpx.post(
+        f"{BASE_URL}/libraries/{library_id}/plugins",
+        json={"plugin_id": plugin_id},
+    )
+    if 200 <= response.status_code < 300:
+        print("Plugin bound to library successfully")
+    else:
+        print(
+            f"Failed to bind plugin to library: {response.status_code} - {response.text}"
+        )
+
+
 if __name__ == "__main__":
     app()
diff --git a/memos/server.py b/memos/server.py
index 9e04a85..11c4fdc 100644
--- a/memos/server.py
+++ b/memos/server.py
@@ -211,6 +211,12 @@ def list_plugins(db: Session = Depends(get_db)):
 def add_library_plugin(
     library_id: int, new_plugin: NewLibraryPluginParam, db: Session = Depends(get_db)
 ):
+    library = crud.get_library_by_id(library_id, db)
+    if any(plugin.id == new_plugin.plugin_id for plugin in library.plugins):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Plugin already exists in the library",
+        )
     crud.add_plugin_to_library(library_id, new_plugin.plugin_id, db)