api: improve message serialisation

pkgs/clan-cli/clan_cli/api/__init__.py

@@ -1,12 +1,14 @@
 from collections.abc import Callable
-from typing import Any
+from typing import Any, TypeVar
+
+T = TypeVar("T")
 
 
 class _MethodRegistry:
     def __init__(self) -> None:
         self._registry: dict[str, Callable] = {}
 
-    def register(self, fn: Callable) -> Callable:
+    def register(self, fn: Callable[..., T]) -> Callable[..., T]:
         self._registry[fn.__name__] = fn
         return fn
 

pkgs/clan-cli/clan_cli/api/util.py

@@ -44,6 +44,7 @@ def type_to_dict(t: Any, scope: str = "") -> dict:
         elif issubclass(origin, dict):
             return {
                 "type": "object",
+                "additionalProperties": type_to_dict(t.__args__[1], scope),
             }
 
         raise BaseException(f"Error api type not yet supported {t!s}")