diff --git a/api/controllers/console/workspace/plugin.py b/api/controllers/console/workspace/plugin.py
index c5624e0fc2..805058ba5a 100644
--- a/api/controllers/console/workspace/plugin.py
+++ b/api/controllers/console/workspace/plugin.py
@@ -46,8 +46,8 @@ class PluginDebuggingKeyApi(Resource):
 
 
 class ParserList(BaseModel):
-    page: int = Field(default=1)
-    page_size: int = Field(default=256)
+    page: int = Field(default=1, ge=1, description="Page number")
+    page_size: int = Field(default=256, ge=1, le=256, description="Page size (1-256)")
 
 
 reg(ParserList)
@@ -106,8 +106,8 @@ class ParserPluginIdentifierQuery(BaseModel):
 
 
 class ParserTasks(BaseModel):
-    page: int
-    page_size: int
+    page: int = Field(default=1, ge=1, description="Page number")
+    page_size: int = Field(default=256, ge=1, le=256, description="Page size (1-256)")
 
 
 class ParserMarketplaceUpgrade(BaseModel):