diff --git a/cdp-agentkit-core/cdp_agentkit_core/actions/social/twitter/post_tweet_reply.py b/cdp-agentkit-core/cdp_agentkit_core/actions/social/twitter/post_tweet_reply.py
new file mode 100644
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+++ b/cdp-agentkit-core/cdp_agentkit_core/actions/social/twitter/post_tweet_reply.py
@@ -0,0 +1,57 @@
+from collections.abc import Callable
+from json import dumps
+
+import tweepy
+from pydantic import BaseModel, Field
+
+from cdp_agentkit_core.actions.social.twitter import TwitterAction
+
+POST_TWEET_REPLY_REPLY_PROMPT = """
+This tool will post a reply to a tweet on Twitter. The tool takes the text of the tweet as input and the tweet id to reply to. Tweets can be maximum 280 characters."""
+
+
+class PostTweetReplyInput(BaseModel):
+    """Input argument schema for twitter post tweet reply action."""
+
+    tweet_id: str = Field(
+        ...,
+        description="The tweet id to post a reply to twitter",
+    )
+
+    tweet_reply: str = Field(
+        ...,
+        description="The text of the tweet to post in reply to another tweet on twitter. Tweets can be maximum 280 characters.",
+    )
+
+
+def post_tweet_reply(client: tweepy.Client, tweet_id: str, tweet_reply: str) -> str:
+    """post tweet reply to Twitter.
+
+    Args:
+        client (tweepy.Client): The tweepy client to use.
+        tweet (str): The text of the tweet to post to twitter. Tweets can be maximum 280 characters.
+
+    Returns:
+        str: A message containing the result of the post action and the tweet.
+
+    """
+    message = ""
+
+    try:
+        response = client.create_tweet(text=tweet_reply, in_reply_to_tweet_id=tweet_id)
+        data = response.data
+
+        message = f"Successfully posted reply to Twitter:\n{dumps(data)}"
+    except tweepy.errors.TweepyException as e:
+        message = f"Error posting reply to Twitter: {e}"
+
+    return message
+
+
+class PostTweetReplyAction(TwitterAction):
+    """Twitter (X) post tweet reply action."""
+
+    name: str = "post_tweet_reply"
+    description: str = POST_TWEET_REPLY_REPLY_PROMPT
+    args_schema: type[BaseModel] | None = PostTweetReplyInput
+    func: Callable[..., str] = post_tweet_reply