diff --git a/src/dify_plugin/entities/tool.py b/src/dify_plugin/entities/tool.py
index ef4e0d7a..cdebcb84 100644
--- a/src/dify_plugin/entities/tool.py
+++ b/src/dify_plugin/entities/tool.py
@@ -15,6 +15,7 @@
 from dify_plugin.entities import I18nObject, ParameterOption
 from dify_plugin.entities.invoke_message import InvokeMessage
 from dify_plugin.entities.model.message import PromptMessageTool
+from dify_plugin.entities.model.provider import FormShowOnObject
 from dify_plugin.entities.oauth import OAuthSchema
 from dify_plugin.entities.provider_config import (
     CommonParameterType,
@@ -47,7 +48,10 @@ class ToolIdentity(BaseModel):
     description="The option of the tool parameter",
 )
 class ToolParameterOption(ParameterOption):
-    pass
+    show_on: list[FormShowOnObject] = Field(
+        default_factory=list,
+        description="The conditions that control whether the option is shown",
+    )
 
 
 @docs(
@@ -130,6 +134,10 @@ class ToolParameterForm(Enum):
     options: list[ToolParameterOption] | None = None
     # MCP object and array type parameters use this field to store the schema
     input_schema: Mapping[str, Any] | None = None
+    show_on: list[FormShowOnObject] = Field(
+        default_factory=list,
+        description="The conditions that control whether the parameter is shown",
+    )
 
     @model_validator(mode="after")
     def validate_multiple(self) -> "ToolParameter":
diff --git a/tests/entities/test_tool.py b/tests/entities/test_tool.py
index a0b692eb..b6748708 100644
--- a/tests/entities/test_tool.py
+++ b/tests/entities/test_tool.py
@@ -44,3 +44,41 @@ def test_tool_parameter_rejects_invalid_multiple_select(
             "form": "form",
             **values,
         })
+
+
+def test_tool_parameter_preserves_show_on_conditions() -> None:
+    base = {
+        "name": "format",
+        "label": {"en_US": "Format"},
+        "human_description": {"en_US": "Output format"},
+        "type": "select",
+        "form": "form",
+    }
+    conditions = [{"variable": "mode", "value": "advanced"}]
+    parameter = ToolParameter.model_validate(
+        base
+        | {
+            "show_on": conditions,
+            "options": [
+                {
+                    "value": "json",
+                    "label": {"en_US": "JSON"},
+                    "show_on": conditions,
+                }
+            ],
+        }
+    )
+
+    assert [condition.model_dump() for condition in parameter.show_on] == conditions
+    assert parameter.options
+    assert [
+        condition.model_dump() for condition in parameter.options[0].show_on
+    ] == conditions
+    assert ToolParameter.model_validate(parameter.model_dump()) == parameter
+
+    defaulted = ToolParameter.model_validate(
+        base | {"options": [{"value": "text", "label": {"en_US": "Text"}}]}
+    )
+    assert defaulted.show_on == []
+    assert defaulted.options
+    assert defaulted.options[0].show_on == []