diff --git a/src/a2a/server/request_handlers/rest_handler.py b/src/a2a/server/request_handlers/rest_handler.py
index b809dcb5b..04d2ebce3 100644
--- a/src/a2a/server/request_handlers/rest_handler.py
+++ b/src/a2a/server/request_handlers/rest_handler.py
@@ -293,7 +293,7 @@ async def list_tasks(
         proto_utils.parse_params(request.query_params, params)
 
         result = await self.request_handler.on_list_tasks(params, context)
-        return MessageToDict(result)
+        return MessageToDict(result, always_print_fields_with_no_presence=True)
 
     async def list_push_notifications(
         self,
diff --git a/tck/sut_agent.py b/tck/sut_agent.py
index 8f2f09379..7196b828b 100644
--- a/tck/sut_agent.py
+++ b/tck/sut_agent.py
@@ -5,15 +5,26 @@
 
 from datetime import datetime, timezone
 
+import grpc.aio
 import uvicorn
 
+from starlette.applications import Starlette
+
+import a2a.compat.v0_3.a2a_v0_3_pb2_grpc as a2a_v0_3_grpc
+import a2a.types.a2a_pb2_grpc as a2a_grpc
+
+from a2a.compat.v0_3.grpc_handler import CompatGrpcHandler
 from a2a.server.agent_execution.agent_executor import AgentExecutor
 from a2a.server.agent_execution.context import RequestContext
-from a2a.server.apps import A2AStarletteApplication
+from a2a.server.apps import (
+    A2ARESTFastAPIApplication,
+    A2AStarletteApplication,
+)
 from a2a.server.events.event_queue import EventQueue
 from a2a.server.request_handlers.default_request_handler import (
     DefaultRequestHandler,
 )
+from a2a.server.request_handlers.grpc_handler import GrpcHandler
 from a2a.server.tasks.inmemory_task_store import InMemoryTaskStore
 from a2a.server.tasks.task_store import TaskStore
 from a2a.types import (
@@ -32,6 +43,7 @@
 
 
 JSONRPC_URL = '/a2a/jsonrpc'
+REST_URL = '/a2a/rest'
 
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger('SUTAgent')
@@ -133,6 +145,8 @@ def serve(task_store: TaskStore) -> None:
     """Sets up the A2A service and starts the HTTP server."""
     http_port = int(os.environ.get('HTTP_PORT', '41241'))
 
+    grpc_port = int(os.environ.get('GRPC_PORT', '50051'))
+
     agent_card = AgentCard(
         name='SUT Agent',
         description='An agent to be used as SUT against TCK tests.',
@@ -140,7 +154,17 @@ def serve(task_store: TaskStore) -> None:
             AgentInterface(
                 url=f'http://localhost:{http_port}{JSONRPC_URL}',
                 protocol_binding='JSONRPC',
-                protocol_version='0.3.0',
+                protocol_version='1.0.0',
+            ),
+            AgentInterface(
+                url=f'http://localhost:{http_port}{REST_URL}',
+                protocol_binding='REST',
+                protocol_version='1.0.0',
+            ),
+            AgentInterface(
+                url=f'http://localhost:{grpc_port}',
+                protocol_binding='GRPC',
+                protocol_version='1.0.0',
             ),
         ],
         provider=AgentProvider(
@@ -172,15 +196,49 @@ def serve(task_store: TaskStore) -> None:
         task_store=task_store,
     )
 
-    server = A2AStarletteApplication(
+    main_app = Starlette()
+
+    # JSONRPC
+    jsonrpc_server = A2AStarletteApplication(
         agent_card=agent_card,
         http_handler=request_handler,
     )
+    jsonrpc_server.add_routes_to_app(main_app, rpc_url=JSONRPC_URL)
 
-    app = server.build(rpc_url=JSONRPC_URL)
+    # REST
+    rest_server = A2ARESTFastAPIApplication(
+        agent_card=agent_card,
+        http_handler=request_handler,
+    )
+    rest_app = rest_server.build(rpc_url=REST_URL)
+    main_app.mount('', rest_app)
+
+    config = uvicorn.Config(
+        main_app, host='127.0.0.1', port=http_port, log_level='info'
+    )
+    uvicorn_server = uvicorn.Server(config)
+
+    # GRPC
+    grpc_server = grpc.aio.server()
+    grpc_server.add_insecure_port(f'[::]:{grpc_port}')
+    servicer = GrpcHandler(agent_card, request_handler)
+    compat_servicer = CompatGrpcHandler(agent_card, request_handler)
+    a2a_grpc.add_A2AServiceServicer_to_server(servicer, grpc_server)
+    a2a_v0_3_grpc.add_A2AServiceServicer_to_server(compat_servicer, grpc_server)
+
+    logger.info(
+        'Starting HTTP server on port %s and gRPC on port %s...',
+        http_port,
+        grpc_port,
+    )
 
-    logger.info('Starting HTTP server on port %s...', http_port)
-    uvicorn.run(app, host='127.0.0.1', port=http_port, log_level='info')
+    loop = asyncio.get_event_loop()
+    loop.run_until_complete(grpc_server.start())
+    loop.run_until_complete(
+        asyncio.gather(
+            uvicorn_server.serve(), grpc_server.wait_for_termination()
+        )
+    )
 
 
 def main() -> None: