refactor: improve code readability in environment tools

Refactored the file_search_tool.py, grep_tool.py, and list_dir_tool.py to enhance code readability. Changes include formatting list comprehensions for better clarity, adjusting error handling for consistency, and removing unnecessary imports. These improvements aim to streamline the codebase and maintain a clean structure for future development.

lib/crewai/src/crewai/experimental/environment_tools/file_search_tool.py

@@ -91,7 +91,9 @@ Examples:
                 matches = [m for m in matches if m.is_dir()]
 
             # Filter out hidden files
-            matches = [m for m in matches if not any(part.startswith(".") for part in m.parts)]
+            matches = [
+                m for m in matches if not any(part.startswith(".") for part in m.parts)
+            ]
 
             # Sort alphabetically
             matches.sort(key=lambda x: str(x).lower())

lib/crewai/src/crewai/experimental/environment_tools/grep_tool.py

@@ -120,7 +120,8 @@ Examples:
                 output = result.stdout
                 # Count actual match lines (not context lines)
                 match_lines = [
-                    line for line in output.split("\n")
+                    line
+                    for line in output.split("\n")
                     if line and not line.startswith("--")
                 ]
                 match_count = len(match_lines)
@@ -129,18 +130,19 @@ Examples:
                 header += "=" * 60 + "\n"
                 return header + output
 
-            elif result.returncode == 1:
+            if result.returncode == 1:
                 # No matches found (grep returns 1 for no matches)
                 return f"No matches found for '{pattern}' in {path}"
 
-            else:
-                # Error occurred
-                error_msg = result.stderr.strip() if result.stderr else "Unknown error"
-                return f"Error: {error_msg}"
+            # Error occurred
+            error_msg = result.stderr.strip() if result.stderr else "Unknown error"
+            return f"Error: {error_msg}"
 
         except subprocess.TimeoutExpired:
             return "Error: Search timed out (>30s). Try narrowing the search path."
         except FileNotFoundError:
-            return "Error: grep command not found. Ensure grep is installed on the system."
+            return (
+                "Error: grep command not found. Ensure grep is installed on the system."
+            )
         except Exception as e:
             return f"Error during search: {e}"

lib/crewai/src/crewai/experimental/environment_tools/list_dir_tool.py

@@ -2,8 +2,6 @@
 
 from __future__ import annotations
 
-from pathlib import Path
-
 from pydantic import BaseModel, Field
 
 from crewai.experimental.environment_tools.base_environment_tool import (