fix: blocks list endpoint bug (#1421)

letta/server/rest_api/routers/v1/blocks.py

@@ -18,7 +18,7 @@ router = APIRouter(prefix="/blocks", tags=["blocks"])
 def list_blocks(
     # query parameters
     label: Optional[str] = Query(None, description="Labels to include (e.g. human, persona)"),
-    templates_only: bool = Query(True, description="Whether to include only templates"),
+    templates_only: bool = Query(False, description="Whether to include only templates"),
     name: Optional[str] = Query(None, description="Name of the block"),
     identity_id: Optional[str] = Query(None, description="Search agents by identifier id"),
     identifier_keys: Optional[List[str]] = Query(None, description="Search agents by identifier keys"),

tests/test_sdk_client.py

@@ -592,3 +592,60 @@ def test_agent_creation(client: LettaSDKClient):
     assert len(agent_tools) == 2
     tool_ids = {tool1.id, tool2.id}
     assert all(tool.id in tool_ids for tool in agent_tools)
+
+
+def test_many_blocks(client: LettaSDKClient):
+    users = ["user1", "user2"]
+    # Create agent with the blocks
+    agent1 = client.agents.create(
+        name=f"test_agent_{str(uuid.uuid4())}",
+        memory_blocks=[
+            CreateBlock(
+                label="user1",
+                value="user preferences: loud",
+            ),
+            CreateBlock(
+                label="user2",
+                value="user preferences: happy",
+            ),
+        ],
+        model="openai/gpt-4o-mini",
+        embedding="openai/text-embedding-ada-002",
+        include_base_tools=False,
+        tags=["test"],
+    )
+    agent2 = client.agents.create(
+        name=f"test_agent_{str(uuid.uuid4())}",
+        memory_blocks=[
+            CreateBlock(
+                label="user1",
+                value="user preferences: sneezy",
+            ),
+            CreateBlock(
+                label="user2",
+                value="user preferences: lively",
+            ),
+        ],
+        model="openai/gpt-4o-mini",
+        embedding="openai/text-embedding-ada-002",
+        include_base_tools=False,
+        tags=["test"],
+    )
+
+    # Verify the agent was created successfully
+    assert agent1 is not None
+    assert agent2 is not None
+
+    # Verify all memory blocks are properly attached
+    for user in users:
+        agent_block = client.agents.blocks.retrieve(agent_id=agent1.id, block_label=user)
+        assert agent_block is not None
+
+        blocks = client.blocks.list(label=user)
+        assert len(blocks) == 2
+
+        for block in blocks:
+            client.blocks.delete(block.id)
+
+    client.agents.delete(agent1.id)
+    client.agents.delete(agent2.id)

tests/test_v1_routes.py

@@ -364,7 +364,7 @@ def test_list_blocks(client, mock_sync_server):
     Test the GET /v1/blocks endpoint to list blocks.
     """
     # Arrange: mock return from block_manager
-    mock_block = Block(label="human", value="Hi", is_template=True)
+    mock_block = Block(label="human", value="Hi")
     mock_sync_server.block_manager.get_blocks.return_value = [mock_block]
 
     # Act
@@ -378,7 +378,7 @@ def test_list_blocks(client, mock_sync_server):
     mock_sync_server.block_manager.get_blocks.assert_called_once_with(
         actor=mock_sync_server.user_manager.get_user_or_default.return_value,
         label=None,
-        is_template=True,
+        is_template=False,
         template_name=None,
         identity_id=None,
         identifier_keys=None,