diff --git a/scripts/mma_exec.py b/scripts/mma_exec.py
index d1ece92..61c4ba9 100644
--- a/scripts/mma_exec.py
+++ b/scripts/mma_exec.py
@@ -1,5 +1,6 @@
 import argparse
 import subprocess
+import json
 
 def get_role_documents(role: str) -> list[str]:
     if role == 'tier1':
@@ -15,9 +16,24 @@ def execute_agent(role: str, prompt: str, docs: list[str]) -> str:
     for doc in docs:
         command_text += f" @{doc}"
     
-    cmd = ["gemini", command_text]
-    process = subprocess.run(cmd, capture_output=True, text=True)
-    return process.stdout
+    cmd = ['gemini', '-p', command_text, '--output-format', 'json', '--model', 'gemini-2.5-flash-lite']
+    try:
+        process = subprocess.run(cmd, capture_output=True, text=True, shell=True)
+        if not process.stdout and process.stderr:
+            return f"Error: {process.stderr}"
+            
+        stdout = process.stdout
+        start_index = stdout.find('{')
+        if start_index != -1:
+            json_str = stdout[start_index:]
+            try:
+                data = json.loads(json_str)
+                return data.get('response', stdout)
+            except json.JSONDecodeError:
+                return stdout
+        return stdout
+    except Exception as e:
+        return f"Execution failed: {str(e)}"
 
 def create_parser():
     parser = argparse.ArgumentParser(description="MMA Execution Script")
diff --git a/tests/test_mma_exec.py b/tests/test_mma_exec.py
index 15e1ae1..56964e6 100644
--- a/tests/test_mma_exec.py
+++ b/tests/test_mma_exec.py
@@ -64,7 +64,8 @@ def test_execute_agent():
         cmd_list = args[0]
         
         assert cmd_list[0] == "gemini"
-        assert cmd_list[1] == expected_gemini_arg
+        assert cmd_list[1] == "-p"
+        assert cmd_list[2] == expected_gemini_arg
         assert kwargs.get("capture_output") is True
         assert kwargs.get("text") is True