diff --git a/apps/api/src/main.py b/apps/api/src/main.py
index 1bd58cf..06fe5dd 100644
--- a/apps/api/src/main.py
+++ b/apps/api/src/main.py
@@ -185,6 +185,7 @@ services:
                 "category": "ai-assistant",
                 "interface_type": "terminal",
                 "requires_port": False,
+                "default_port": 0,
                 "compose_template": """version: "3.8"
 services:
   opencode:
@@ -247,7 +248,8 @@ volumes:
                 existing.definition_type = "compose"
                 existing.compose_template = tool_data["compose_template"]
                 existing.required_variables = tool_data["required_variables"]
-                existing.default_port = tool_data.get("default_port")
+                if "default_port" in tool_data:
+                    existing.default_port = tool_data["default_port"]
                 logger.info("Updated built-in tool type: %s", tool_data["name"])
 
         await session.commit()