diff --git a/python/dify_plugin/entities/model/message.py b/python/dify_plugin/entities/model/message.py
index c4f41c85..0884101d 100644
--- a/python/dify_plugin/entities/model/message.py
+++ b/python/dify_plugin/entities/model/message.py
@@ -14,6 +14,7 @@ class PromptMessageRole(Enum):
     USER = "user"
     ASSISTANT = "assistant"
     TOOL = "tool"
+    DEVELOPER = "developer"
 
     @classmethod
     def value_of(cls, value: str) -> "PromptMessageRole":
@@ -241,6 +242,14 @@ class SystemPromptMessage(PromptMessage):
     role: PromptMessageRole = PromptMessageRole.SYSTEM
 
 
+class DeveloperPromptMessage(PromptMessage):
+    """
+    Model class for developer prompt message.
+    """
+
+    role: PromptMessageRole = PromptMessageRole.DEVELOPER
+
+
 class ToolPromptMessage(PromptMessage):
     """
     Model class for tool prompt message.