diff --git a/src/crewai_tools/tools/serpapi_tool/serpapi_base_tool.py b/src/crewai_tools/tools/serpapi_tool/serpapi_base_tool.py
index 57e33e71e..98491190c 100644
--- a/src/crewai_tools/tools/serpapi_tool/serpapi_base_tool.py
+++ b/src/crewai_tools/tools/serpapi_tool/serpapi_base_tool.py
@@ -1,10 +1,12 @@
 import os
 import re
-from typing import Optional, Any
+from typing import Optional, Any, Union
 
 from crewai.tools import BaseTool
 
 class SerpApiBaseTool(BaseTool):
+    """Base class for SerpApi functionality with shared capabilities."""
+
     client: Optional[Any] = None
 
     def __init__(self, **kwargs):
@@ -14,7 +16,7 @@ class SerpApiBaseTool(BaseTool):
             from serpapi import Client
         except ImportError:
             raise ImportError(
-                "`serpapi` package not found"
+                "`serpapi` package not found, please install with `pip install serpapi`"
             )
         api_key = os.getenv("SERPAPI_API_KEY")
         if not api_key:
@@ -23,7 +25,7 @@ class SerpApiBaseTool(BaseTool):
             )
         self.client = Client(api_key=api_key)
 
-    def _omit_fields(self, data, omit_patterns):
+    def _omit_fields(self, data: Union[dict, list], omit_patterns: list[str]) -> None:
         if isinstance(data, dict):
             for field in list(data.keys()):
                 if any(re.compile(p).match(field) for p in omit_patterns):
@@ -34,4 +36,3 @@ class SerpApiBaseTool(BaseTool):
         elif isinstance(data, list):
             for item in data:
                 self._omit_fields(item, omit_patterns)
-