diff --git a/libs/collab-stream/src/model.rs b/libs/collab-stream/src/model.rs
index 0443ec5b..5e8b5901 100644
--- a/libs/collab-stream/src/model.rs
+++ b/libs/collab-stream/src/model.rs
@@ -5,18 +5,49 @@ use std::str::FromStr;
 use crate::error::{internal, StreamError};
 use redis::{FromRedisValue, RedisError, RedisResult, Value};
 
+/// The [MessageId] generated by XADD has two parts: a timestamp and a sequence number, separated by
+/// a hyphen (-). The timestamp is based on the server's time when the message is added, and the
+/// sequence number is used to differentiate messages added at the same millisecond.
+///
+///  If multiple messages are added within the same millisecond, Redis increments the sequence number
+/// for each subsequent message
+///
+/// An example message ID might look like this: 1631020452097-0. In this example, 1631020452097 is
+/// the timestamp in milliseconds, and 0 is the sequence number.
 #[derive(Debug)]
-pub struct CreatedTime {
+pub struct MessageId {
   pub timestamp_ms: u64,
-
-  // applies if more than one message is sent at the same millisecond
-  // this distinguishes the order of the messages
   pub sequence_number: u16,
 }
 
-impl CreatedTime {
-  fn from_redis_stream_key(bytes: &[u8]) -> Result<Self, StreamError> {
-    let s = std::str::from_utf8(bytes)?;
+impl ToString for MessageId {
+  fn to_string(&self) -> String {
+    format!("{}-{}", self.timestamp_ms, self.sequence_number)
+  }
+}
+
+impl MessageId {
+  pub fn sub_ms(&mut self, ms: u64) {
+    if self.timestamp_ms < ms {
+      return;
+    }
+    self.timestamp_ms -= ms;
+  }
+}
+
+impl TryFrom<&[u8]> for MessageId {
+  type Error = StreamError;
+
+  fn try_from(s: &[u8]) -> Result<Self, Self::Error> {
+    let s = std::str::from_utf8(s)?;
+    Self::try_from(s)
+  }
+}
+
+impl TryFrom<&str> for MessageId {
+  type Error = StreamError;
+
+  fn try_from(s: &str) -> Result<Self, Self::Error> {
     let parts: Vec<_> = s.splitn(2, '-').collect();
 
     if parts.len() != 2 {
@@ -27,17 +58,17 @@ impl CreatedTime {
     let timestamp_ms = u64::from_str(parts[0])?;
     let sequence_number = u16::from_str(parts[1])?;
 
-    Ok(CreatedTime {
+    Ok(MessageId {
       timestamp_ms,
       sequence_number,
     })
   }
 }
 
-impl FromRedisValue for CreatedTime {
+impl FromRedisValue for MessageId {
   fn from_redis_value(v: &Value) -> RedisResult<Self> {
     match v {
-      Value::Data(stream_key) => CreatedTime::from_redis_stream_key(stream_key).map_err(|_| {
+      Value::Data(stream_key) => MessageId::try_from(stream_key.as_slice()).map_err(|_| {
         RedisError::from((
           redis::ErrorKind::TypeError,
           "invalid stream key",
@@ -50,13 +81,13 @@ impl FromRedisValue for CreatedTime {
 }
 
 #[derive(Debug)]
-pub struct MessageReadByStreamKey(pub BTreeMap<String, Vec<MessageRead>>);
+pub struct StreamMessageByStreamKey(pub BTreeMap<String, Vec<StreamMessage>>);
 
-impl FromRedisValue for MessageReadByStreamKey {
+impl FromRedisValue for StreamMessageByStreamKey {
   fn from_redis_value(v: &Value) -> RedisResult<Self> {
-    let mut map: BTreeMap<String, Vec<MessageRead>> = BTreeMap::new();
+    let mut map: BTreeMap<String, Vec<StreamMessage>> = BTreeMap::new();
     if matches!(v, Value::Nil) {
-      return Ok(MessageReadByStreamKey(map));
+      return Ok(StreamMessageByStreamKey(map));
     }
 
     let value_by_id = bulk_from_redis_value(v)?.iter();
@@ -74,25 +105,26 @@ impl FromRedisValue for MessageReadByStreamKey {
       let stream_key = RedisString::from_redis_value(&key_values[0])?.0;
       let values = bulk_from_redis_value(&key_values[1])?.iter();
       for value in values {
-        let value = MessageRead::from_redis_value(value)?;
+        let value = StreamMessage::from_redis_value(value)?;
         map.entry(stream_key.clone()).or_default().push(value);
       }
     }
 
-    Ok(MessageReadByStreamKey(map))
+    Ok(StreamMessageByStreamKey(map))
   }
 }
 
+/// A message in the Redis stream. It's the same as [Message] but with additional metadata.
 #[derive(Debug)]
-pub struct MessageRead {
+pub struct StreamMessage {
   /// user who did the change
   pub uid: i64,
   pub raw_data: Vec<u8>,
   /// only applicable when reading from redis
-  pub created_time: CreatedTime,
+  pub message_id: MessageId,
 }
 
-impl FromRedisValue for MessageRead {
+impl FromRedisValue for StreamMessage {
   // Optimized parsing function
   fn from_redis_value(v: &Value) -> RedisResult<Self> {
     let bulk = bulk_from_redis_value(v)?;
@@ -104,7 +136,7 @@ impl FromRedisValue for MessageRead {
       )));
     }
 
-    let created_time = CreatedTime::from_redis_value(&bulk[0])?;
+    let created_time = MessageId::from_redis_value(&bulk[0])?;
     let fields = bulk_from_redis_value(&bulk[1])?;
     if fields.len() != 4 {
       return Err(RedisError::from((
@@ -119,10 +151,10 @@ impl FromRedisValue for MessageRead {
     verify_field(&fields[2], "data")?;
     let raw_data = Vec::<u8>::from_redis_value(&fields[3])?;
 
-    Ok(MessageRead {
+    Ok(StreamMessage {
       uid,
       raw_data,
-      created_time,
+      message_id: created_time,
     })
   }
 
@@ -136,8 +168,8 @@ pub struct Message {
   pub raw_data: Vec<u8>,
 }
 
-impl From<MessageRead> for Message {
-  fn from(m: MessageRead) -> Self {
+impl From<StreamMessage> for Message {
+  fn from(m: StreamMessage) -> Self {
     Message {
       uid: m.uid,
       raw_data: m.raw_data,
diff --git a/libs/collab-stream/src/stream.rs b/libs/collab-stream/src/stream.rs
index e7ccfa55..c1cab6c5 100644
--- a/libs/collab-stream/src/stream.rs
+++ b/libs/collab-stream/src/stream.rs
@@ -1,5 +1,5 @@
 use crate::error::StreamError;
-use crate::model::{CreatedTime, Message, MessageRead, MessageReadByStreamKey};
+use crate::model::{Message, MessageId, StreamMessage, StreamMessageByStreamKey};
 use redis::aio::ConnectionManager;
 use redis::streams::{StreamMaxlen, StreamReadOptions};
 use redis::{pipe, AsyncCommands, RedisError};
@@ -19,13 +19,13 @@ impl CollabStream {
   }
 
   /// Inserts a single message into the Redis stream.
-  pub async fn insert_message(&mut self, message: Message) -> Result<CreatedTime, StreamError> {
+  pub async fn insert_message(&mut self, message: Message) -> Result<MessageId, StreamError> {
     let tuple = message.into_tuple_array();
-    let created_time = self
+    let message_id = self
       .connection_manager
       .xadd(&self.stream_key, "*", tuple.as_slice())
       .await?;
-    Ok(created_time)
+    Ok(message_id)
   }
 
   /// Inserts multiple messages into the Redis stream using a pipeline.
@@ -42,9 +42,9 @@ impl CollabStream {
 
   /// Fetches the next message from a Redis stream after a specified entry.
   ///
-  pub async fn next(&mut self) -> Result<Option<Message>, StreamError> {
+  pub async fn next(&mut self) -> Result<Option<StreamMessage>, StreamError> {
     let options = StreamReadOptions::default().count(1).block(100);
-    let map: MessageReadByStreamKey = self
+    let map: StreamMessageByStreamKey = self
       .connection_manager
       .xread_options(&[&self.stream_key], &["$"], &options)
       .await?;
@@ -56,21 +56,21 @@ impl CollabStream {
       .ok_or_else(|| StreamError::UnexpectedValue("Empty stream".into()))?;
 
     debug_assert_eq!(messages.len(), 1);
-    Ok(messages.pop().map(Into::into))
+    Ok(messages.pop())
   }
 
   pub async fn next_after(
     &mut self,
-    after: Option<CreatedTime>,
-  ) -> Result<Option<Message>, StreamError> {
-    let id = after
-      .map(|ct| format!("{}-{}", ct.timestamp_ms, ct.sequence_number))
+    after: Option<MessageId>,
+  ) -> Result<Option<StreamMessage>, StreamError> {
+    let message_id = after
+      .map(|ct| ct.to_string())
       .unwrap_or_else(|| "$".to_string());
 
     let options = StreamReadOptions::default().group("1", "2").block(100);
-    let map: MessageReadByStreamKey = self
+    let map: StreamMessageByStreamKey = self
       .connection_manager
-      .xread_options(&[&self.stream_key], &[&id], &options)
+      .xread_options(&[&self.stream_key], &[&message_id], &options)
       .await?;
 
     let (_, mut messages) = map
@@ -80,11 +80,11 @@ impl CollabStream {
       .ok_or_else(|| StreamError::UnexpectedValue("Empty stream".into()))?;
 
     debug_assert_eq!(messages.len(), 1);
-    Ok(messages.pop().map(Into::into))
+    Ok(messages.pop())
   }
 
   pub async fn read_all_message(&mut self) -> Result<Vec<Message>, StreamError> {
-    let read_messages: Vec<MessageRead> =
+    let read_messages: Vec<StreamMessage> =
       self.connection_manager.xrange_all(&self.stream_key).await?;
     Ok(read_messages.into_iter().map(Into::into).collect())
   }
diff --git a/libs/collab-stream/src/stream_group.rs b/libs/collab-stream/src/stream_group.rs
index 6826e4fb..a66dd30a 100644
--- a/libs/collab-stream/src/stream_group.rs
+++ b/libs/collab-stream/src/stream_group.rs
@@ -1,7 +1,7 @@
 use crate::error::StreamError;
-use crate::model::{CreatedTime, Message, MessageRead, MessageReadByStreamKey};
+use crate::model::{Message, MessageId, StreamMessage, StreamMessageByStreamKey};
 use redis::aio::ConnectionManager;
-use redis::streams::{StreamMaxlen, StreamReadOptions};
+use redis::streams::{StreamMaxlen, StreamPendingData, StreamPendingReply, StreamReadOptions};
 use redis::{pipe, AsyncCommands, RedisError, RedisResult};
 
 #[derive(Clone)]
@@ -40,6 +40,12 @@ impl CollabStreamGroup {
   }
 
   /// Acknowledges messages processed by a consumer.
+  ///
+  /// In Redis streams, when a message is delivered to a consumer using XREADGROUP, it moves into
+  /// a pending state for that consumer. Redis expects you to manually acknowledge these messages
+  /// using XACK once they have been successfully processed. If you don't acknowledge a message,
+  /// it remains in the pending state for that consumer. Redis keeps track of these messages so you
+  /// can handle message failures or retries.
   pub async fn ack_messages(&mut self, message_ids: &[String]) -> Result<(), StreamError> {
     self
       .connection_manager
@@ -49,13 +55,13 @@ impl CollabStreamGroup {
   }
 
   /// Inserts a single message into the Redis stream.
-  pub async fn insert_message(&mut self, message: Message) -> Result<CreatedTime, StreamError> {
+  pub async fn insert_message(&mut self, message: Message) -> Result<MessageId, StreamError> {
     let tuple = message.into_tuple_array();
-    let created_time = self
+    let message_id = self
       .connection_manager
       .xadd(&self.stream_key, "*", tuple.as_slice())
       .await?;
-    Ok(created_time)
+    Ok(message_id)
   }
 
   /// Inserts multiple messages into the Redis stream using a pipeline.
@@ -73,33 +79,88 @@ impl CollabStreamGroup {
   /// Fetches number of messages from a Redis stream
   /// Returns the messages that were not consumed yet. Which means each message is delivered to only
   /// one consumer in the group
-  pub async fn fetch_messages(
+  ///
+  /// $: This symbol is used with the XREAD command to indicate that you want to start reading only
+  /// new messages that arrive in the stream after the read command has been issued. Essentially,
+  /// it tells Redis to ignore all the messages already in the stream and only listen for new ones.
+  /// It's particularly useful when you want to start processing messages from the current moment
+  /// forward and don't need to process historical messages.
+  ///
+  /// >: This symbol is used with the XREADGROUP command in the context of consumer groups. When a
+  /// consumer group reads from a stream using >, it tells Redis to deliver only messages that have
+  /// not yet been acknowledged by any consumer in the group. This allows different consumers in the
+  /// group to read and process different messages concurrently, without receiving messages that have
+  /// already been processed by another consumer. It's a way to distribute the workload of processing
+  /// stream messages across multiple consumers.
+  pub async fn consumer_messages(
     &mut self,
     consumer_name: &str,
-    count: usize,
-  ) -> Result<Vec<Message>, StreamError> {
-    let options = StreamReadOptions::default()
+    option: ConsumeOptions,
+  ) -> Result<Vec<StreamMessage>, StreamError> {
+    let mut options = StreamReadOptions::default()
       .group(&self.group_name, consumer_name)
-      .count(count)
       .block(100);
 
-    let map: MessageReadByStreamKey = self
+    let mut message_id = ">".to_string();
+    match option {
+      ConsumeOptions::Empty => {},
+      ConsumeOptions::Count(count) => {
+        options = options.count(count);
+      },
+      ConsumeOptions::After(after) => {
+        message_id = after.to_string();
+      },
+    }
+
+    let map: StreamMessageByStreamKey = self
       .connection_manager
-      .xread_options(&[&self.stream_key], &[">"], &options)
+      .xread_options(&[&self.stream_key], &[message_id], &options)
       .await?;
 
     match map.0.into_iter().next() {
       None => Ok(Vec::with_capacity(0)),
-      Some((_, messages)) => Ok(messages.into_iter().map(Into::into).collect()),
+      Some((_, messages)) => Ok(messages),
+    }
+  }
+
+  /// Get messages starting from a specific message id.
+  /// returns list of messages excluding the message with the start_id
+  pub async fn get_messages_starting_from_id(
+    &mut self,
+    start_id: Option<String>,
+    count: usize,
+  ) -> Result<Vec<StreamMessage>, StreamError> {
+    let options = StreamReadOptions::default().count(count).block(100);
+    let message_id = start_id.unwrap_or_else(|| "0".to_string());
+    let map: StreamMessageByStreamKey = self
+      .connection_manager
+      .xread_options(&[&self.stream_key], &[message_id], &options)
+      .await?;
+
+    match map.0.into_iter().next() {
+      None => Ok(Vec::with_capacity(0)),
+      Some((_, messages)) => Ok(messages),
     }
   }
 
   /// Reads all messages from the stream
   ///
-  pub async fn read_all_message(&mut self) -> Result<Vec<Message>, StreamError> {
-    let read_messages: Vec<MessageRead> =
+  pub async fn get_all_message(&mut self) -> Result<Vec<StreamMessage>, StreamError> {
+    let read_messages: Vec<StreamMessage> =
       self.connection_manager.xrange_all(&self.stream_key).await?;
-    Ok(read_messages.into_iter().map(Into::into).collect())
+    Ok(read_messages.into_iter().collect())
+  }
+
+  pub async fn pending_reply(&mut self) -> Result<Option<StreamPendingData>, StreamError> {
+    let reply: StreamPendingReply = self
+      .connection_manager
+      .xpending(&self.stream_key, &self.group_name)
+      .await?;
+
+    match reply {
+      StreamPendingReply::Empty => Ok(None),
+      StreamPendingReply::Data(data) => Ok(Some(data)),
+    }
   }
 
   pub async fn clear(&mut self) -> Result<(), RedisError> {
@@ -110,3 +171,9 @@ impl CollabStreamGroup {
     Ok(())
   }
 }
+
+pub enum ConsumeOptions {
+  Empty,
+  Count(usize),
+  After(MessageId),
+}
diff --git a/libs/collab-stream/tests/collab_stream_test/mod.rs b/libs/collab-stream/tests/collab_stream_test/mod.rs
new file mode 100644
index 00000000..a7c84e32
--- /dev/null
+++ b/libs/collab-stream/tests/collab_stream_test/mod.rs
@@ -0,0 +1,4 @@
+mod pubsub_test;
+mod stream_group_test;
+mod stream_test;
+mod test_util;
diff --git a/libs/collab-stream/tests/stream_test/pubsub_test.rs b/libs/collab-stream/tests/collab_stream_test/pubsub_test.rs
similarity index 89%
rename from libs/collab-stream/tests/stream_test/pubsub_test.rs
rename to libs/collab-stream/tests/collab_stream_test/pubsub_test.rs
index 0da4c113..e0e8b6f5 100644
--- a/libs/collab-stream/tests/stream_test/pubsub_test.rs
+++ b/libs/collab-stream/tests/collab_stream_test/pubsub_test.rs
@@ -1,4 +1,4 @@
-use crate::stream_test::test_util::{pubsub_client, random_i64};
+use crate::collab_stream_test::test_util::{pubsub_client, random_i64};
 
 use collab_stream::pubsub::PubSubMessage;
 
@@ -7,7 +7,7 @@ use std::time::Duration;
 use tokio::time::sleep;
 
 #[tokio::test]
-async fn different_group_read_message_test() {
+async fn pubsub_test() {
   let oid = format!("o{}", random_i64());
   let client_1 = pubsub_client().await;
   let client_2 = pubsub_client().await;
diff --git a/libs/collab-stream/tests/stream_test/group_read_test.rs b/libs/collab-stream/tests/collab_stream_test/stream_group_test.rs
similarity index 63%
rename from libs/collab-stream/tests/stream_test/group_read_test.rs
rename to libs/collab-stream/tests/collab_stream_test/stream_group_test.rs
index aeeb213c..34ce6f22 100644
--- a/libs/collab-stream/tests/stream_test/group_read_test.rs
+++ b/libs/collab-stream/tests/collab_stream_test/stream_group_test.rs
@@ -1,5 +1,6 @@
-use crate::stream_test::test_util::{random_i64, stream_client};
-use collab_stream::model::Message;
+use crate::collab_stream_test::test_util::{random_i64, stream_client};
+use collab_stream::model::{Message, MessageId};
+use collab_stream::stream_group::ConsumeOptions;
 use futures::future::join;
 
 #[tokio::test]
@@ -21,14 +22,17 @@ async fn single_group_read_message_test() {
     group.insert_message(msg).await.unwrap();
   }
 
-  let messages = group.fetch_messages("consumer1", 1).await.unwrap();
+  let messages = group
+    .consumer_messages("consumer1", ConsumeOptions::Empty)
+    .await
+    .unwrap();
   assert_eq!(messages.len(), 1);
   assert_eq!(messages[0].raw_data, vec![1, 2, 3, 4, 5]);
   assert_eq!(messages[0].uid, random_uid);
 
   // after the message was consumed, it should not be available anymore
   assert!(group
-    .fetch_messages("consumer1", 1)
+    .consumer_messages("consumer1", ConsumeOptions::Count(1))
     .await
     .unwrap()
     .is_empty());
@@ -54,8 +58,8 @@ async fn different_group_read_message_test() {
   }
 
   let (result1, result2) = join(
-    group_1.fetch_messages("consumer1", 1),
-    group_2.fetch_messages("consumer1", 1),
+    group_1.consumer_messages("consumer1", ConsumeOptions::Empty),
+    group_2.consumer_messages("consumer1", ConsumeOptions::Empty),
   )
   .await;
   let group_1_messages = result1.unwrap();
@@ -86,7 +90,10 @@ async fn read_specific_num_of_message_test() {
     group.insert_messages(messages).await.unwrap();
   }
 
-  let messages = group_1.fetch_messages("consumer1", 15).await.unwrap();
+  let messages = group_1
+    .consumer_messages("consumer1", ConsumeOptions::Count(15))
+    .await
+    .unwrap();
   assert_eq!(messages.len(), 5);
   for i in 0..5 {
     assert_eq!(messages[i].raw_data, vec![1, 2, 3, 4, 5]);
@@ -116,9 +123,18 @@ async fn read_all_message_test() {
     group.insert_messages(messages).await.unwrap();
   }
 
-  let messages = group.read_all_message().await.unwrap();
-  let consumer_messages = group.fetch_messages("consumer1", 15).await.unwrap();
-  assert_eq!(messages.len(), 5);
+  // get all the message in the group
+  let messages = group.get_all_message().await.unwrap();
+  for i in 0..5 {
+    assert_eq!(messages[i].raw_data, vec![1, 2, 3, 4, 5]);
+    assert_eq!(messages[i].uid, uids[i]);
+  }
+
+  // consume all message for given consumer
+  let consumer_messages = group
+    .consumer_messages("consumer1", ConsumeOptions::Count(15))
+    .await
+    .unwrap();
   assert_eq!(consumer_messages.len(), 5);
   for i in 0..5 {
     assert_eq!(messages[i].raw_data, vec![1, 2, 3, 4, 5]);
@@ -127,4 +143,31 @@ async fn read_all_message_test() {
     assert_eq!(messages[i].uid, uids[i]);
     assert_eq!(consumer_messages[i].uid, uids[i]);
   }
+
+  // get the pending state
+  let pending = group.pending_reply().await.unwrap().unwrap();
+  assert_eq!(pending.consumers.len(), 1);
+  assert_eq!(pending.consumers[0].name, "consumer1".to_string(),);
+  assert_eq!(pending.consumers[0].pending, 5);
+
+  // get pending message start from first message
+  let mut message_id = MessageId::try_from(pending.start_id.as_str()).unwrap();
+
+  // try to min 2 millisecond from the message id in order to get all the messages. Otherwise, only
+  // 4 messages will be returned.
+  message_id.sub_ms(2);
+  let pending_messages = group
+    .get_messages_starting_from_id(Some(message_id.to_string()), pending.count)
+    .await
+    .unwrap();
+  assert_eq!(pending_messages.len(), 5);
+
+  // ack all messages.
+  let message_ids = consumer_messages
+    .iter()
+    .map(|m| m.message_id.to_string())
+    .collect::<Vec<_>>();
+  group.ack_messages(&message_ids).await.unwrap();
+  let pending = group.pending_reply().await.unwrap();
+  assert!(pending.is_none());
 }
diff --git a/libs/collab-stream/tests/stream_test/read_test.rs b/libs/collab-stream/tests/collab_stream_test/stream_test.rs
similarity index 95%
rename from libs/collab-stream/tests/stream_test/read_test.rs
rename to libs/collab-stream/tests/collab_stream_test/stream_test.rs
index 374dfc6a..b7e41200 100644
--- a/libs/collab-stream/tests/stream_test/read_test.rs
+++ b/libs/collab-stream/tests/collab_stream_test/stream_test.rs
@@ -1,4 +1,4 @@
-use crate::stream_test::test_util::{random_i64, stream_client};
+use crate::collab_stream_test::test_util::{random_i64, stream_client};
 use collab_stream::model::Message;
 
 #[tokio::test]
diff --git a/libs/collab-stream/tests/stream_test/test_util.rs b/libs/collab-stream/tests/collab_stream_test/test_util.rs
similarity index 100%
rename from libs/collab-stream/tests/stream_test/test_util.rs
rename to libs/collab-stream/tests/collab_stream_test/test_util.rs
diff --git a/libs/collab-stream/tests/main.rs b/libs/collab-stream/tests/main.rs
index 27702e4e..e4a94b98 100644
--- a/libs/collab-stream/tests/main.rs
+++ b/libs/collab-stream/tests/main.rs
@@ -1 +1 @@
-mod stream_test;
+mod collab_stream_test;
diff --git a/libs/collab-stream/tests/stream_test/mod.rs b/libs/collab-stream/tests/stream_test/mod.rs
deleted file mode 100644
index 422f94c3..00000000
--- a/libs/collab-stream/tests/stream_test/mod.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-mod group_read_test;
-mod pubsub_test;
-mod read_test;
-mod test_util;