fix: correct Conversation.messages access and ToolSchema dict keys for mypy

Author: RheagalFire

plugins/litellm/vision_agents/plugins/litellm/litellm_llm.py

@@ -225,7 +225,10 @@ async def _build_model_request(self) -> list[dict[str, object]]:
         if self._instructions:
             messages.append({"role": "system", "content": self._instructions})
         if self._conversation:
-            messages.extend(await self._conversation.get_messages())
+            messages.extend(
+                {"role": m.role, "content": m.content}
+                for m in self._conversation.messages
+            )
         return messages
 
     def _convert_tools_to_provider_format(
@@ -235,9 +238,9 @@ def _convert_tools_to_provider_format(
             {
                 "type": "function",
                 "function": {
-                    "name": t.name,
-                    "description": t.description,
-                    "parameters": t.parameters,
+                    "name": t["name"],
+                    "description": t.get("description", ""),
+                    "parameters": t.get("parameters_schema", {}),
                 },
             }
             for t in tools