feat(agent): 新增AI_AGENT_VERBOSE开关，控制工具调用过程回复及提示词输出

app/agent/prompt/__init__.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 from typing import Dict
 
+from app.core.config import settings
 from app.log import logger
 from app.schemas import (
     ChannelCapability,
@@ -73,6 +74,14 @@ class PromptManager:
         # 始终替换占位符，避免后续 .format() 时因残留花括号报 KeyError
         base_prompt = base_prompt.replace("{markdown_spec}", markdown_spec)
 
+        # 据 VERBOSE 开关动态调整提示词：关闭时要求避免工具调用前的废话
+        if not settings.AI_AGENT_VERBOSE:
+            base_prompt += (
+                "\n\n[Important Instruction] If you need to call a tool, DO NOT output any conversational "
+                "text or explanations before calling the tool. Call the tool directly without transitional "
+                "phrases like 'Let me check', 'I will look this up', etc."
+            )
+
         return base_prompt
 
     @staticmethod