Fix availability busy slot serialization in REST adapter

app/main.py

@@ -398,7 +398,10 @@ async def availability(request: AvailabilityRequest) -> AvailabilityResponse:
             start=result.start,
             end=result.end,
             available=result.available,
-            busy_slots=result.busy_slots, # type: ignore
+            busy_slots=[
+                BusySlot.model_validate(slot, from_attributes=True)
+                for slot in result.busy_slots
+            ],
             checked_calendars=result.checked_calendars,
         )
     except ValueError as exc:

tests/test_a2a_availability.py

@@ -6,11 +6,7 @@ from fastapi import Response
 
 import app.a2a.router as a2a_module
 from app.a2a.models import A2ARpcRequest
-
+from app.core.models import CoreBusySlot
-
-class _Slot(dict):
-    def __getattr__(self, item: str) -> str:
-        return self[item]
 
 
 class _DummyCoreService:
@@ -21,7 +17,7 @@ class _DummyCoreService:
         calendar_ids: list[str] | None,
     ) -> SimpleNamespace:
         checked = calendar_ids or ["primary"]
-        busy_slots = [_Slot(calendar_id=checked[0], start=start, end=end)]
+        busy_slots = [CoreBusySlot(calendar_id=checked[0], start=start, end=end)]
         return SimpleNamespace(
             start=start,
             end=end,

tests/test_mcp_availability.py

@@ -7,16 +7,12 @@ from fastapi import Response
 
 import app.a2a.router as a2a_module
 from app.a2a.models import A2ARpcRequest
+from app.core.models import CoreBusySlot
 import app.main as main_module
 import app.mcp.server as mcp_server_module
 import app.mcp.tools as mcp_tools_module
 
 
-class _Slot(dict):
-    def __getattr__(self, item: str) -> str:
-        return self[item]
-
-
 class _DummyCoreService:
     def check_availability(
         self,
@@ -25,7 +21,7 @@ class _DummyCoreService:
         calendar_ids: list[str] | None,
     ) -> SimpleNamespace:
         checked = calendar_ids or ["primary"]
-        busy_slots = [_Slot(calendar_id=checked[0], start=start, end=end)]
+        busy_slots = [CoreBusySlot(calendar_id=checked[0], start=start, end=end)]
         return SimpleNamespace(
             start=start,
             end=end,

tests/test_rest_availability.py

@@ -4,11 +4,7 @@ import asyncio
 from types import SimpleNamespace
 
 import app.main as main_module
-
+from app.core.models import CoreBusySlot
-
-class _Slot(dict):
-    def __getattr__(self, item: str) -> str:
-        return self[item]
 
 
 class _DummyCoreService:
@@ -20,7 +16,7 @@ class _DummyCoreService:
     ) -> SimpleNamespace:
         checked = calendar_ids or ["primary"]
         busy_slots = [
-            _Slot(
+            CoreBusySlot(
                 calendar_id=checked[0],
                 start=start,
                 end=end,