diff --git a/src/praisonai-agents/praisonaiagents/agent/chat_mixin.py b/src/praisonai-agents/praisonaiagents/agent/chat_mixin.py
index 7babf3600..0f56d30f8 100644
--- a/src/praisonai-agents/praisonaiagents/agent/chat_mixin.py
+++ b/src/praisonai-agents/praisonaiagents/agent/chat_mixin.py
@@ -507,7 +507,7 @@ def _process_stream_response(self, messages, temperature, start_time, formatted_
             emit_events=True
         )
 
-    def _chat_completion(self, messages, temperature=1.0, tools=None, stream=True, reasoning_steps=False, task_name=None, task_description=None, task_id=None, response_format=None, _retry_depth=0):
+    def _chat_completion(self, messages, temperature=1.0, tools=None, stream=False, reasoning_steps=False, task_name=None, task_description=None, task_id=None, response_format=None, _retry_depth=0):
         start_time = time.time()
 
         # --- Context compaction (opt-in via ExecutionConfig.context_compaction) ---
@@ -774,7 +774,7 @@ def _execute_unified_chat_completion(
         messages, 
         temperature=1.0, 
         tools=None, 
-        stream=True,
+        stream=False,
         reasoning_steps=False,
         task_name=None,
         task_description=None,
@@ -857,7 +857,7 @@ async def _execute_unified_achat_completion(
         messages, 
         temperature=1.0, 
         tools=None, 
-        stream=True,
+        stream=True,  # Async methods keep stream=True default (async adapters support streaming)
         reasoning_steps=False,
         task_name=None,
         task_description=None,
diff --git a/src/praisonai-agents/tests/unit/agent/test_chat_sync_stream_defaults.py b/src/praisonai-agents/tests/unit/agent/test_chat_sync_stream_defaults.py
new file mode 100644
index 000000000..3a28fae7d
--- /dev/null
+++ b/src/praisonai-agents/tests/unit/agent/test_chat_sync_stream_defaults.py
@@ -0,0 +1,48 @@
+import ast
+from pathlib import Path
+
+
+def _chat_mixin_path() -> Path:
+    for candidate in Path(__file__).resolve().parents:
+        chat_mixin = candidate / "praisonaiagents" / "agent" / "chat_mixin.py"
+        if chat_mixin.exists():
+            return chat_mixin
+    raise FileNotFoundError("Could not locate praisonaiagents/agent/chat_mixin.py")
+
+
+def get_chat_mixin_stream_parameter_default(function_name: str):
+    chat_mixin = _chat_mixin_path()
+    tree = ast.parse(chat_mixin.read_text(encoding="utf-8"))
+
+    for node in tree.body:
+        if isinstance(node, ast.ClassDef) and node.name == "ChatMixin":
+            for item in node.body:
+                if isinstance(item, ast.FunctionDef) and item.name == function_name:
+                    args = item.args.args
+                    defaults = item.args.defaults
+                    first_default_index = len(args) - len(defaults)
+                    for idx, arg in enumerate(args):
+                        if arg.arg == "stream":
+                            default_idx = idx - first_default_index
+                            if default_idx < 0:
+                                raise AssertionError(
+                                    f"Function '{function_name}' has no default for stream"
+                                )
+                            default = defaults[default_idx]
+                            if isinstance(default, ast.Constant):
+                                return default.value
+                            raise AssertionError(
+                                f"Function '{function_name}' stream default is non-constant"
+                            )
+    raise AssertionError(f"Function '{function_name}' or stream parameter not found")
+
+
+def test_chat_completion_stream_default_is_false():
+    assert get_chat_mixin_stream_parameter_default("_chat_completion") is False
+
+
+def test_execute_unified_chat_completion_stream_default_is_false():
+    assert (
+        get_chat_mixin_stream_parameter_default("_execute_unified_chat_completion")
+        is False
+    )