chore: improve typing and docs in agents leaf files (#3461)

- Add typing and Google-style docstrings to agents leaf files
- Add TODO notes

src/crewai/agents/agent_adapters/base_converter_adapter.py

@@ -1,29 +1,58 @@
+"""Base converter adapter for structured output conversion."""
+
+from __future__ import annotations
+
 from abc import ABC, abstractmethod
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from crewai.agents.agent_adapters.base_agent_adapter import BaseAgentAdapter
+    from crewai.task import Task
 
 
 class BaseConverterAdapter(ABC):
-    """Base class for all converter adapters in CrewAI.
+    """Abstract base class for converter adapters in CrewAI.
 
-    This abstract class defines the common interface and functionality that all
-    converter adapters must implement for converting structured output.
+    Defines the common interface for converting agent outputs to structured formats.
+    All converter adapters must implement the methods defined here.
     """
 
-    def __init__(self, agent_adapter):
+    def __init__(self, agent_adapter: BaseAgentAdapter) -> None:
+        """Initialize the converter adapter.
+
+        Args:
+            agent_adapter: The agent adapter to configure for structured output.
+        """
         self.agent_adapter = agent_adapter
 
     @abstractmethod
-    def configure_structured_output(self, task) -> None:
+    def configure_structured_output(self, task: Task) -> None:
         """Configure agents to return structured output.
-        Must support json and pydantic output.
+
+        Must support both JSON and Pydantic output formats.
+
+        Args:
+            task: The task requiring structured output.
         """
-        pass
 
     @abstractmethod
     def enhance_system_prompt(self, base_prompt: str) -> str:
-        """Enhance the system prompt with structured output instructions."""
-        pass
+        """Enhance the system prompt with structured output instructions.
+
+        Args:
+            base_prompt: The original system prompt.
+
+        Returns:
+            Enhanced prompt with structured output guidance.
+        """
 
     @abstractmethod
     def post_process_result(self, result: str) -> str:
-        """Post-process the result to ensure it matches the expected format: string."""
-        pass
+        """Post-process the result to ensure proper string format.
+
+        Args:
+            result: The raw result from agent execution.
+
+        Returns:
+            Processed result as a string.
+        """