Fixes a problem where formatted tools would break

It seems like the first time we are calling _format_tools everything works fine, but on a second run, the _snake_case_to_camel_case converts the input parameters to camelCase and breaks the tools.

libs/aws/langchain_aws/chat_models/bedrock_converse.py

@@ -312,6 +312,11 @@ class Joke(BaseModel):
     config: Any = None
     """An optional botocore.config.Config instance to pass to the client."""
 
+    formatted_tools: List[
+        Dict[Literal["toolSpec"], Dict[str, Union[Dict[str, Any], str]]]
+    ] = Field(default_factory=list, exclude=True)
+    """"Formatted tools to be stored and used in the toolConfig parameter."""
+
     class Config:
         """Configuration for this pydantic object."""
 
@@ -411,7 +416,8 @@ def bind_tools(
     ) -> Runnable[LanguageModelInput, BaseMessage]:
         if tool_choice:
             kwargs["tool_choice"] = _format_tool_choice(tool_choice)
-        return self.bind(tools=_format_tools(tools), **kwargs)
+        self.formatted_tools = _format_tools(tools)
+        return self.bind(tools=self.formatted_tools, **kwargs)
 
     def with_structured_output(
         self,
@@ -465,7 +471,7 @@ def _converse_params(
             }
         if not toolConfig and tools:
             toolChoice = _format_tool_choice(toolChoice) if toolChoice else None
-            toolConfig = {"tools": _format_tools(tools), "toolChoice": toolChoice}
+            toolConfig = {"tools": self.formatted_tools, "toolChoice": toolChoice}
         return _drop_none(
             {
                 "modelId": modelId or self.model_id,