diff --git a/astrbot/core/astr_main_agent.py b/astrbot/core/astr_main_agent.py
index 3cd849194..53f0efee1 100644
--- a/astrbot/core/astr_main_agent.py
+++ b/astrbot/core/astr_main_agent.py
@@ -335,7 +335,7 @@ async def _ensure_persona_and_skills(
                 if tool and tool.active:
                     persona_toolset.add_tool(tool)  # type: ignore[arg-type]
     if not req.func_tool:
-        req.func_tool = persona_toolset
+        req.func_tool = persona_toolset  # type: ignore[assignment]
     else:
         req.func_tool.merge(persona_toolset)