Change to remove model_dump='json'

Author: holtskinner

src/a2a/client/client.py

@@ -98,9 +98,7 @@ async def get_agent_card(
                 target_url,
                 agent_card_data,
             )
-            agent_card = AgentCard.model_validate(
-                agent_card_data, by_alias=True
-            )
+            agent_card = AgentCard.model_validate(agent_card_data)
         except httpx.HTTPStatusError as e:
             raise A2AClientHTTPError(
                 e.response.status_code,

src/a2a/server/apps/jsonrpc/jsonrpc_app.py

@@ -376,7 +376,6 @@ async def _handle_get_agent_card(self, request: Request) -> JSONResponse:
         # provided at initialization.
         return JSONResponse(
             self.agent_card.model_dump(
-                mode='json',
                 exclude_none=True,
                 by_alias=True,
             )
@@ -396,7 +395,6 @@ async def _handle_get_authenticated_extended_agent_card(
         if self.extended_agent_card:
             return JSONResponse(
                 self.extended_agent_card.model_dump(
-                    mode='json',
                     exclude_none=True,
                     by_alias=True,
                 )