diff --git a/veadk/runner.py b/veadk/runner.py
index 06f49038..5b7b6183 100644
--- a/veadk/runner.py
+++ b/veadk/runner.py
@@ -14,6 +14,7 @@
 from typing import Union
 
 from google.adk.agents import RunConfig
+from google.adk.agents.invocation_context import LlmCallsLimitExceededError
 from google.adk.agents.run_config import StreamingMode
 from google.adk.plugins.base_plugin import BasePlugin
 from google.adk.runners import Runner as ADKRunner
@@ -49,20 +50,25 @@ class Runner:
     def __init__(
         self,
         agent: VeAgent,
-        short_term_memory: ShortTermMemory,
+        short_term_memory: ShortTermMemory | None = None,
         plugins: list[BasePlugin] | None = None,
         app_name: str = "veadk_default_app",
         user_id: str = "veadk_default_user",
     ):
-        # basic settings
         self.app_name = app_name
         self.user_id = user_id
 
-        # agent settings
         self.agent = agent
 
-        self.short_term_memory = short_term_memory
-        self.session_service = short_term_memory.session_service
+        if not short_term_memory:
+            logger.info(
+                "No short term memory provided, using a in-memory memory by default."
+            )
+            self.short_term_memory = ShortTermMemory()
+        else:
+            self.short_term_memory = short_term_memory
+
+        self.session_service = self.short_term_memory.session_service
 
         # prevent VeRemoteAgent has no long-term memory attr
         if isinstance(self.agent, Agent):
@@ -114,35 +120,44 @@ async def _run(
         self,
         session_id: str,
         message: types.Content,
+        run_config: RunConfig | None = None,
         stream: bool = False,
     ):
         stream_mode = StreamingMode.SSE if stream else StreamingMode.NONE
 
-        async def event_generator():
-            async for event in self.runner.run_async(
-                user_id=self.user_id,
-                session_id=session_id,
-                new_message=message,
-                run_config=RunConfig(streaming_mode=stream_mode),
-            ):
-                if event.get_function_calls():
-                    for function_call in event.get_function_calls():
-                        logger.debug(f"Function call: {function_call}")
-                elif (
-                    event.content is not None
-                    and event.content.parts
-                    and event.content.parts[0].text is not None
-                    and len(event.content.parts[0].text.strip()) > 0
-                ):
-                    yield event.content.parts[0].text
+        if run_config is not None:
+            stream_mode = run_config.streaming_mode
+        else:
+            run_config = RunConfig(streaming_mode=stream_mode)
+        try:
 
-        final_output = ""
-        async for chunk in event_generator():
+            async def event_generator():
+                async for event in self.runner.run_async(
+                    user_id=self.user_id,
+                    session_id=session_id,
+                    new_message=message,
+                    run_config=run_config,
+                ):
+                    if event.get_function_calls():
+                        for function_call in event.get_function_calls():
+                            logger.debug(f"Function call: {function_call}")
+                    elif (
+                        event.content is not None
+                        and event.content.parts
+                        and event.content.parts[0].text is not None
+                        and len(event.content.parts[0].text.strip()) > 0
+                    ):
+                        yield event.content.parts[0].text
+
+            final_output = ""
+            async for chunk in event_generator():
+                if stream:
+                    print(chunk, end="", flush=True)
+                final_output += chunk
             if stream:
-                print(chunk, end="", flush=True)
-            final_output += chunk
-        if stream:
-            print()  # end with a new line
+                print()  # end with a new line
+        except LlmCallsLimitExceededError as e:
+            logger.warning(f"Max number of llm calls limit exceeded: {e}")
 
         return final_output
 
@@ -151,6 +166,7 @@ async def run(
         messages: RunnerMessage,
         session_id: str,
         stream: bool = False,
+        run_config: RunConfig | None = None,
         save_tracing_data: bool = False,
     ):
         converted_messages: list = self._convert_messages(messages)
@@ -163,7 +179,9 @@ async def run(
 
         final_output = ""
         for converted_message in converted_messages:
-            final_output = await self._run(session_id, converted_message, stream)
+            final_output = await self._run(
+                session_id, converted_message, run_config, stream
+            )
 
         # try to save tracing file
         if save_tracing_data:
@@ -193,6 +211,47 @@ def get_trace_id(self) -> str:
             logger.warning(f"Get tracer id failed as {e}")
             return "<unknown_trace_id>"
 
+    async def run_with_raw_message(
+        self,
+        message: types.Content,
+        session_id: str,
+        run_config: RunConfig | None = None,
+    ):
+        run_config = RunConfig() if not run_config else run_config
+
+        await self.short_term_memory.create_session(
+            app_name=self.app_name, user_id=self.user_id, session_id=session_id
+        )
+
+        try:
+
+            async def event_generator():
+                async for event in self.runner.run_async(
+                    user_id=self.user_id,
+                    session_id=session_id,
+                    new_message=message,
+                    run_config=run_config,
+                ):
+                    if event.get_function_calls():
+                        for function_call in event.get_function_calls():
+                            logger.debug(f"Function call: {function_call}")
+                    elif (
+                        event.content is not None
+                        and event.content.parts
+                        and event.content.parts[0].text is not None
+                        and len(event.content.parts[0].text.strip()) > 0
+                    ):
+                        yield event.content.parts[0].text
+
+            final_output = ""
+
+            async for chunk in event_generator():
+                final_output += chunk
+        except LlmCallsLimitExceededError as e:
+            logger.warning(f"Max number of llm calls limit exceeded: {e}")
+
+        return final_output
+
     def _print_trace_id(self) -> None:
         if not isinstance(self.agent, Agent):
             logger.warning(