diff --git a/pyproject.toml b/pyproject.toml
index 57c90c32..009c035a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "veadk-python"
-version = "0.2.21"
+version = "0.2.22"
 description = "Volcengine agent development kit, integrations with Volcengine cloud services."
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/veadk/configs/database_configs.py b/veadk/configs/database_configs.py
index a886a9b8..6de68036 100644
--- a/veadk/configs/database_configs.py
+++ b/veadk/configs/database_configs.py
@@ -75,6 +75,8 @@ class RedisConfig(BaseSettings):
 
     port: int = 6379
 
+    username: str | None = None
+
     password: str = ""
 
     db: int = 0
diff --git a/veadk/knowledgebase/backends/redis_backend.py b/veadk/knowledgebase/backends/redis_backend.py
index b990fb0a..400824c2 100644
--- a/veadk/knowledgebase/backends/redis_backend.py
+++ b/veadk/knowledgebase/backends/redis_backend.py
@@ -88,6 +88,7 @@ def model_post_init(self, __context: Any) -> None:
             host=self.redis_config.host,
             port=self.redis_config.port,
             db=self.redis_config.db,
+            username=self.redis_config.username,
             password=self.redis_config.password,
         )
 
diff --git a/veadk/runner.py b/veadk/runner.py
index ebd357a2..1955fd58 100644
--- a/veadk/runner.py
+++ b/veadk/runner.py
@@ -288,128 +288,6 @@ class Runner(ADKRunner):
         This class wraps the parent ``run_async`` at initialization to insert media
         upload and post-run handling. If you override the underlying ``run_async``,
         ensure it remains compatible with this interception logic.
-
-    Examples:
-        ### Text-only interaction
-
-        ```python
-        import asyncio
-
-        from veadk import Agent, Runner
-
-        agent = Agent()
-
-        runner = Runner(agent=agent)
-
-        response = asyncio.run(runner.run(messages="北京的天气怎么样？"))
-
-        print(response)
-        ```
-
-        ### Send multimodal data to agent
-
-        Currently, VeADK support send multimodal data (i.e., text with images) to agent, and invoke the corresponding model to do tasks.
-
-        !!! info "Note for multimodal running"
-
-            When sending multimodal data to agent, the model of agent must support multimodal data processing. For example, `doubao-1-6`.
-
-        ```python
-        import asyncio
-
-        from veadk import Agent, Runner
-        from veadk.types import MediaMessage
-
-        agent = Agent(model_name="doubao-seed-1-6-250615")
-
-        runner = Runner(agent=agent)
-
-        message = MediaMessage(
-            text="Describe the image",
-            media="https://...", # <-- replace here with an image from web
-        )
-        response = asyncio.run(runner.run(messages=message))
-
-        print(response)
-        ```
-
-        ### Run with run_async
-
-        You are recommand that **using `run_async` in production to invoke agent**. During running, the loop will throw out `event`, you can process each `event` according to your requirements.
-
-        ```python
-        import uuid
-
-        from google.genai import types
-        from veadk import Agent, Runner
-
-        APP_NAME = "app"
-        USER_ID = "user"
-
-        agent = Agent()
-
-        runner = Runner(agent=agent, app_name=APP_NAME)
-
-
-        async def main(message: types.Content, session_id: str):
-            # before running, you should create a session first
-            await runner.short_term_memory.create_session(
-                app_name=APP_NAME, user_id=USER_ID, session_id=session_id
-            )
-
-            async for event in runner.run_async(
-                user_id=USER_ID,
-                session_id=session_id,
-                new_message=message,
-            ):
-                # process event here
-                print(event)
-
-
-        if __name__ == "__main__":
-            import asyncio
-
-            message = types.Content(parts=[types.Part(text="Hello")], role="user")
-            session_id = str(uuid.uuid1())
-            asyncio.run(main(message=message, session_id=session_id))
-        ```
-
-        ### Custom your message
-
-        You can custom your message content, as Google provides some basic types to build and custom agent's input. For example, you can build a message with a text and several images.
-
-        ```python
-        from google.genai import types
-
-        # build message with a text
-        message = types.Content(parts=[types.Part(text="Hello")], role="user")
-
-        # build message with a text and an image
-        message = types.Content(
-            parts=[
-                types.Part(text="Hello!"),
-                types.Part(
-                    inline_data=types.Blob(display_name="foo.png", data=..., mime_type=...)
-                ),
-            ],
-            role="user",
-        )
-
-        # build image with several text and several images
-        message = types.Content(
-            parts=[
-                types.Part(text="Hello!"),
-                types.Part(text="Please help me to describe the following images."),
-                types.Part(
-                    inline_data=types.Blob(display_name="foo.png", data=..., mime_type=...)
-                ),
-                types.Part(
-                    inline_data=types.Blob(display_name="bar.png", data=..., mime_type=...)
-                ),
-            ],
-            role="user",
-        )
-        ```
     """
 
     def __init__(
diff --git a/veadk/version.py b/veadk/version.py
index a6961407..763d0b67 100644
--- a/veadk/version.py
+++ b/veadk/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-VERSION = "0.2.21"
+VERSION = "0.2.22"