make tool verbosity override agent verbosity (#2173)

Currently, if a tool is set to verbose, an agent can override it by
passing in its own verbose flag. This is not ideal if we want to stream
back responses from agents, as we want the llm and tools to be sending
back events but nothing else. This also makes the behavior consistent
with ts.

langchain/tools/base.py

@@ -55,22 +55,24 @@ class BaseTool(BaseModel):
         **kwargs: Any
     ) -> str:
         """Run the tool."""
-        if verbose is None:
-            verbose = self.verbose
+        if not self.verbose and verbose is not None:
+            verbose_ = verbose
+        else:
+            verbose_ = self.verbose
         self.callback_manager.on_tool_start(
             {"name": self.name, "description": self.description},
             tool_input,
-            verbose=verbose,
+            verbose=verbose_,
             color=start_color,
             **kwargs,
         )
         try:
             observation = self._run(tool_input)
         except (Exception, KeyboardInterrupt) as e:
-            self.callback_manager.on_tool_error(e, verbose=verbose)
+            self.callback_manager.on_tool_error(e, verbose=verbose_)
             raise e
         self.callback_manager.on_tool_end(
-            observation, verbose=verbose, color=color, name=self.name, **kwargs
+            observation, verbose=verbose_, color=color, name=self.name, **kwargs
         )
         return observation
 
@@ -83,13 +85,15 @@ class BaseTool(BaseModel):
         **kwargs: Any
     ) -> str:
         """Run the tool asynchronously."""
-        if verbose is None:
-            verbose = self.verbose
+        if not self.verbose and verbose is not None:
+            verbose_ = verbose
+        else:
+            verbose_ = self.verbose
         if self.callback_manager.is_async:
             await self.callback_manager.on_tool_start(
                 {"name": self.name, "description": self.description},
                 tool_input,
-                verbose=verbose,
+                verbose=verbose_,
                 color=start_color,
                 **kwargs,
             )
@@ -97,7 +101,7 @@ class BaseTool(BaseModel):
             self.callback_manager.on_tool_start(
                 {"name": self.name, "description": self.description},
                 tool_input,
-                verbose=verbose,
+                verbose=verbose_,
                 color=start_color,
                 **kwargs,
             )
@@ -106,16 +110,16 @@ class BaseTool(BaseModel):
             observation = await self._arun(tool_input)
         except (Exception, KeyboardInterrupt) as e:
             if self.callback_manager.is_async:
-                await self.callback_manager.on_tool_error(e, verbose=verbose)
+                await self.callback_manager.on_tool_error(e, verbose=verbose_)
             else:
-                self.callback_manager.on_tool_error(e, verbose=verbose)
+                self.callback_manager.on_tool_error(e, verbose=verbose_)
             raise e
         if self.callback_manager.is_async:
             await self.callback_manager.on_tool_end(
-                observation, verbose=verbose, color=color, name=self.name, **kwargs
+                observation, verbose=verbose_, color=color, name=self.name, **kwargs
             )
         else:
             self.callback_manager.on_tool_end(
-                observation, verbose=verbose, color=color, name=self.name, **kwargs
+                observation, verbose=verbose_, color=color, name=self.name, **kwargs
             )
         return observation