fix: address mypy type errors in multiple files

- Fix return type and argument handling in cache_tools.py
- Add missing return statements in agent.py
- Fix _inject_date_to_task signature to accept Task object
- Remove unused type:ignore comments in tool_usage.py
- Add type annotations to internal methods in mem0_storage.py

src/crewai/agent.py

@@ -620,6 +620,7 @@ class Agent(BaseAgent):
             self._logger.log(
                 "info", "Coding tools not available. Install crewai_tools. "
             )
+            return []
 
     def get_output_converter(
         self, llm: BaseLLM, text: str, model: str, instructions: str
@@ -671,7 +672,7 @@ class Agent(BaseAgent):
 
         return description
 
-    def _inject_date_to_task(self, task: str) -> str:
+    def _inject_date_to_task(self, task: Task) -> None:
         """Inject the current date into the task description if inject_date is enabled."""
         if self.inject_date:
             from datetime import datetime

src/crewai/memory/storage/mem0_storage.py

@@ -15,7 +15,9 @@ class Mem0Storage(Storage):
     Extends Storage to handle embedding and searching across entities using Mem0.
     """
 
-    def __init__(self, type, crew=None, config=None):
+    def __init__(
+        self, type: str, crew: Any = None, config: dict[str, Any] | None = None
+    ) -> None:
         super().__init__()
 
         self._validate_type(type)
@@ -26,21 +28,21 @@ class Mem0Storage(Storage):
         self._extract_config_values()
         self._initialize_memory()
 
-    def _validate_type(self, type):
+    def _validate_type(self, type: str) -> None:
         supported_types = {"short_term", "long_term", "entities", "external"}
         if type not in supported_types:
             raise ValueError(
                 f"Invalid type '{type}' for Mem0Storage. Must be one of: {', '.join(supported_types)}"
             )
 
-    def _extract_config_values(self):
+    def _extract_config_values(self) -> None:
         self.mem0_run_id = self.config.get("run_id")
         self.includes = self.config.get("includes")
         self.excludes = self.config.get("excludes")
         self.custom_categories = self.config.get("custom_categories")
         self.infer = self.config.get("infer", True)
 
-    def _initialize_memory(self):
+    def _initialize_memory(self) -> None:
         api_key = self.config.get("api_key") or os.getenv("MEM0_API_KEY")
         org_id = self.config.get("org_id")
         project_id = self.config.get("project_id")
@@ -61,7 +63,7 @@ class Mem0Storage(Storage):
                 else Memory()
             )
 
-    def _create_filter_for_search(self):
+    def _create_filter_for_search(self) -> dict[str, Any]:
         """
         Returns:
             dict: A filter dictionary containing AND conditions for querying data.

src/crewai/tools/cache_tools/cache_tools.py

@@ -21,7 +21,11 @@ class CacheTools(BaseModel):
         )
 
     def hit_cache(self, key: str) -> str:
+        import json
+
         split = key.split("tool:")
         tool = split[1].split("|input:")[0].strip()
-        tool_input = split[1].split("|input:")[1].strip()
-        return self.cache_handler.read(tool, tool_input)
+        tool_input_str = split[1].split("|input:")[1].strip()
+        tool_input = json.loads(tool_input_str) if tool_input_str else None
+        result = self.cache_handler.read(tool, tool_input)
+        return result if result is not None else ""

src/crewai/tools/tool_usage.py

@@ -204,7 +204,7 @@ class ToolUsage:
         if self.tools_handler and self.tools_handler.cache:
             result = self.tools_handler.cache.read(
                 tool=calling.tool_name, input_data=calling.arguments
-            )  # type: ignore
+            )
             from_cache = result is not None
 
         available_tool = next(
@@ -322,7 +322,7 @@ class ToolUsage:
             and available_tool.result_as_answer  # type: ignore # Item "None" of "Any | None" has no attribute "cache_function"
         ):
             result_as_answer = available_tool.result_as_answer  # type: ignore # Item "None" of "Any | None" has no attribute "result_as_answer"
-            data["result_as_answer"] = result_as_answer  # type: ignore
+            data["result_as_answer"] = result_as_answer
 
         if self.agent and hasattr(self.agent, "tools_results"):
             self.agent.tools_results.append(data)