Shell tool improvements

Made shell output more concise.

app.py

@@ -29,7 +29,6 @@ def execute_shell_command(
         Dictionary containing stdout, stderr, and return_code
     """
     try:
-        # Run the command with specified parameters
         process = subprocess.Popen(
             command,
             stdout=subprocess.PIPE,
@@ -39,27 +38,34 @@ def execute_shell_command(
             universal_newlines=True
         )
         
-        # Get command output with optional timeout
         stdout, stderr = process.communicate(timeout=timeout)
         return_code = process.returncode
         
-        return {
-            "stdout": stdout,
-            "stderr": stderr,
-            "return_code": str(return_code)  # Convert to string for consistency
-        }
+        # Format output more concisely
+        if return_code == 0:
+            return {
+                "stdout": stdout.strip(),
+                "stderr": "",
+                "return_code": "0"
+            }
+        else:
+            return {
+                "stdout": "",
+                "stderr": stderr.strip(),
+                "return_code": str(return_code)
+            }
         
     except subprocess.TimeoutExpired:
         process.kill()
         return {
             "stdout": "",
-            "stderr": f"Command timed out after {timeout} seconds",
+            "stderr": f"Timeout after {timeout}s",
             "return_code": "-1"
         }
     except Exception as e:
         return {
             "stdout": "",
-            "stderr": f"Error executing command: {str(e)}",
+            "stderr": str(e),
             "return_code": "-1"
         }