fix: new agent card

src/google/adk/cli/fast_api.py

@@ -339,15 +339,17 @@ async def _get_a2a_runner_async() -> Runner:
         return _get_a2a_runner_async
 
       for p in base_path.iterdir():
-        # only folders with an agent.json file representing agent card are valid
+        # only folders with an agent-card.json or agent.json file representing agent card are valid
         # a2a agents
-        if (
-            p.is_file()
-            or p.name.startswith((".", "__pycache__"))
-            or not (p / "agent.json").is_file()
-        ):
+        if p.is_file() or p.name.startswith(('.', '__pycache__')):
           continue
 
+        json_file = p / 'agent-card.json'
+        if not json_file.is_file():
+          json_file = p / 'agent.json'
+          if not json_file.is_file():
+            continue
+
         app_name = p.name
         logger.info("Setting up A2A agent: %s", app_name)
 
@@ -359,8 +361,7 @@ async def _get_a2a_runner_async() -> Runner:
           request_handler = DefaultRequestHandler(
               agent_executor=agent_executor, task_store=a2a_task_store
           )
-
-          with (p / "agent.json").open("r", encoding="utf-8") as f:
+          with json_file.open("r", encoding="utf-8") as f:
             data = json.load(f)
             agent_card = AgentCard(**data)
 

tests/unittests/agents/test_remote_a2a_agent.py

@@ -112,27 +112,29 @@ def test_init_with_agent_card_object(self):
   def test_init_with_url_string(self):
     """Test initialization with URL string."""
     agent = RemoteA2aAgent(
-        name="test_agent", agent_card="https://example.com/agent.json"
+        name="test_agent", agent_card="https://example.com/agent-card.json"
     )
 
     assert agent.name == "test_agent"
     assert agent._agent_card is None
-    assert agent._agent_card_source == "https://example.com/agent.json"
+    assert agent._agent_card_source == "https://example.com/agent-card.json"
 
   def test_init_with_file_path(self):
     """Test initialization with file path."""
-    agent = RemoteA2aAgent(name="test_agent", agent_card="/path/to/agent.json")
+    agent = RemoteA2aAgent(
+        name="test_agent", agent_card="/path/to/agent-card.json"
+    )
 
     assert agent.name == "test_agent"
     assert agent._agent_card is None
-    assert agent._agent_card_source == "/path/to/agent.json"
+    assert agent._agent_card_source == "/path/to/agent-card.json"
 
   def test_init_with_shared_httpx_client(self):
     """Test initialization with shared httpx client."""
     httpx_client = httpx.AsyncClient()
     agent = RemoteA2aAgent(
         name="test_agent",
-        agent_card="https://example.com/agent.json",
+        agent_card="https://example.com/agent-card.json",
         httpx_client=httpx_client,
     )
 
@@ -158,7 +160,7 @@ def test_init_with_custom_timeout(self):
     """Test initialization with custom timeout."""
     agent = RemoteA2aAgent(
         name="test_agent",
-        agent_card="https://example.com/agent.json",
+        agent_card="https://example.com/agent-card.json",
         timeout=300.0,
     )
 
@@ -219,7 +221,7 @@ async def test_ensure_httpx_client_reuses_existing_client(self):
   async def test_resolve_agent_card_from_url_success(self):
     """Test successful agent card resolution from URL."""
     agent = RemoteA2aAgent(
-        name="test_agent", agent_card="https://example.com/agent.json"
+        name="test_agent", agent_card="https://example.com/agent-card.json"
     )
 
     with patch.object(agent, "_ensure_httpx_client") as mock_ensure_client:
@@ -234,15 +236,15 @@ async def test_resolve_agent_card_from_url_success(self):
         mock_resolver_class.return_value = mock_resolver
 
         result = await agent._resolve_agent_card_from_url(
-            "https://example.com/agent.json"
+            "https://example.com/agent-card.json"
         )
 
         assert result == self.agent_card
         mock_resolver_class.assert_called_once_with(
             httpx_client=mock_client, base_url="https://example.com"
         )
         mock_resolver.get_agent_card.assert_called_once_with(
-            relative_card_path="/agent.json"
+            relative_card_path="/agent-card.json"
         )
 
   @pytest.mark.asyncio
@@ -256,7 +258,9 @@ async def test_resolve_agent_card_from_url_invalid_url(self):
   @pytest.mark.asyncio
   async def test_resolve_agent_card_from_file_success(self):
     """Test successful agent card resolution from file."""
-    agent = RemoteA2aAgent(name="test_agent", agent_card="/path/to/agent.json")
+    agent = RemoteA2aAgent(
+        name="test_agent", agent_card="/path/to/agent-card.json"
+    )
 
     with tempfile.NamedTemporaryFile(
         mode="w", suffix=".json", delete=False
@@ -286,7 +290,9 @@ async def test_resolve_agent_card_from_file_not_found(self):
   @pytest.mark.asyncio
   async def test_resolve_agent_card_from_file_invalid_json(self):
     """Test agent card resolution from file with invalid JSON raises error."""
-    agent = RemoteA2aAgent(name="test_agent", agent_card="/path/to/agent.json")
+    agent = RemoteA2aAgent(
+        name="test_agent", agent_card="/path/to/agent-card.json"
+    )
 
     with tempfile.NamedTemporaryFile(
         mode="w", suffix=".json", delete=False
@@ -393,7 +399,7 @@ async def test_ensure_resolved_with_direct_agent_card(self):
   async def test_ensure_resolved_with_url_source(self):
     """Test _ensure_resolved with URL source."""
     agent = RemoteA2aAgent(
-        name="test_agent", agent_card="https://example.com/agent.json"
+        name="test_agent", agent_card="https://example.com/agent-card.json"
     )
 
     agent_card = create_test_agent_card()

tests/unittests/cli/test_fast_api.py

@@ -500,7 +500,7 @@ def temp_agents_dir_with_a2a():
     agent_dir = Path(temp_dir) / "test_a2a_agent"
     agent_dir.mkdir()
 
-    # Create agent.json file
+    # Create agent-card.json file
     agent_card = {
         "name": "test_a2a_agent",
         "description": "Test A2A agent",
@@ -509,7 +509,7 @@ def temp_agents_dir_with_a2a():
         "capabilities": ["text"],
     }
 
-    with open(agent_dir / "agent.json", "w") as f:
+    with open(agent_dir / "agent-card.json", "w") as f:
       json.dump(agent_card, f)
 
     # Create a simple agent.py file