diff --git a/agent_sdks/python/src/a2ui/adk/a2a_extension/send_a2ui_to_client_toolset.py b/agent_sdks/python/src/a2ui/adk/a2a_extension/send_a2ui_to_client_toolset.py
index 50555ef1b..cb8e1a681 100644
--- a/agent_sdks/python/src/a2ui/adk/a2a_extension/send_a2ui_to_client_toolset.py
+++ b/agent_sdks/python/src/a2ui/adk/a2a_extension/send_a2ui_to_client_toolset.py
@@ -88,9 +88,7 @@ async def get_examples(ctx: ReadonlyContext) -> str:
 """
 
 import inspect
-import json
 import logging
-import re
 from typing import (
     TYPE_CHECKING,
     Any,
@@ -101,7 +99,6 @@ async def get_examples(ctx: ReadonlyContext) -> str:
     Union,
 )
 
-import jsonschema
 
 from a2a import types as a2a_types
 from a2ui.a2a import (
diff --git a/agent_sdks/python/src/a2ui/core/parser/parser.py b/agent_sdks/python/src/a2ui/core/parser/parser.py
index 364fb9a44..04e6c56e1 100644
--- a/agent_sdks/python/src/a2ui/core/parser/parser.py
+++ b/agent_sdks/python/src/a2ui/core/parser/parser.py
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 import re
-from typing import List, Optional, Any
+from typing import List
 from .response_part import ResponsePart
 from ..schema.constants import A2UI_OPEN_TAG, A2UI_CLOSE_TAG
 from .payload_fixer import parse_and_fix
diff --git a/agent_sdks/python/src/a2ui/core/parser/streaming.py b/agent_sdks/python/src/a2ui/core/parser/streaming.py
index 5a23ffe49..fe3b29395 100644
--- a/agent_sdks/python/src/a2ui/core/parser/streaming.py
+++ b/agent_sdks/python/src/a2ui/core/parser/streaming.py
@@ -21,7 +21,6 @@
 from .constants import *
 from ..schema.constants import (
     VERSION_0_9,
-    VERSION_0_8,
     A2UI_OPEN_TAG,
     A2UI_CLOSE_TAG,
     SURFACE_ID_KEY,
diff --git a/agent_sdks/python/src/a2ui/core/parser/streaming_v08.py b/agent_sdks/python/src/a2ui/core/parser/streaming_v08.py
index 6678b77dc..b724d0177 100644
--- a/agent_sdks/python/src/a2ui/core/parser/streaming_v08.py
+++ b/agent_sdks/python/src/a2ui/core/parser/streaming_v08.py
@@ -13,13 +13,12 @@
 # limitations under the License.
 
 import re
-import json
 from typing import Any, List, Dict, Optional, Set
 
 from .streaming import A2uiStreamParser
 from .response_part import ResponsePart
 from .constants import *
-from ..schema.constants import VERSION_0_8, SURFACE_ID_KEY, CATALOG_COMPONENTS_KEY
+from ..schema.constants import SURFACE_ID_KEY, CATALOG_COMPONENTS_KEY
 
 
 class A2uiStreamParserV08(A2uiStreamParser):
diff --git a/agent_sdks/python/src/a2ui/core/parser/streaming_v09.py b/agent_sdks/python/src/a2ui/core/parser/streaming_v09.py
index 5284c0136..135bdb90a 100644
--- a/agent_sdks/python/src/a2ui/core/parser/streaming_v09.py
+++ b/agent_sdks/python/src/a2ui/core/parser/streaming_v09.py
@@ -19,7 +19,7 @@
 from .streaming import A2uiStreamParser
 from .response_part import ResponsePart
 from .constants import *
-from ..schema.constants import VERSION_0_9, SURFACE_ID_KEY, CATALOG_COMPONENTS_KEY
+from ..schema.constants import SURFACE_ID_KEY, CATALOG_COMPONENTS_KEY
 
 
 class A2uiStreamParserV09(A2uiStreamParser):
diff --git a/agent_sdks/python/src/a2ui/core/schema/catalog.py b/agent_sdks/python/src/a2ui/core/schema/catalog.py
index 15898a3a6..96826a2b3 100644
--- a/agent_sdks/python/src/a2ui/core/schema/catalog.py
+++ b/agent_sdks/python/src/a2ui/core/schema/catalog.py
@@ -17,8 +17,8 @@
 import json
 import logging
 import os
-from dataclasses import dataclass, field, replace
-from typing import Any, Dict, List, Optional, TYPE_CHECKING
+from dataclasses import dataclass, replace
+from typing import Any, Dict, List, Optional
 
 from .catalog_provider import A2uiCatalogProvider, FileSystemCatalogProvider
 from .constants import (
diff --git a/agent_sdks/python/src/a2ui/core/schema/manager.py b/agent_sdks/python/src/a2ui/core/schema/manager.py
index 185df6a2e..c9e344b00 100644
--- a/agent_sdks/python/src/a2ui/core/schema/manager.py
+++ b/agent_sdks/python/src/a2ui/core/schema/manager.py
@@ -13,12 +13,7 @@
 # limitations under the License.
 
 import copy
-import json
-import logging
-import os
-import importlib.resources
 from typing import List, Dict, Any, Optional, Callable
-from dataclasses import dataclass, field
 from .utils import load_from_bundled_resource
 from ..inference_strategy import InferenceStrategy
 from .constants import *
diff --git a/agent_sdks/python/src/a2ui/core/schema/validator.py b/agent_sdks/python/src/a2ui/core/schema/validator.py
index 2ba5eec73..51b5afae8 100644
--- a/agent_sdks/python/src/a2ui/core/schema/validator.py
+++ b/agent_sdks/python/src/a2ui/core/schema/validator.py
@@ -27,10 +27,8 @@
 from .constants import (
     BASE_SCHEMA_URL,
     CATALOG_COMPONENTS_KEY,
-    CATALOG_ID_KEY,
     CATALOG_STYLES_KEY,
     VERSION_0_8,
-    VERSION_0_9,
 )
 
 # RFC 6901 compliant regex for JSON Pointer
diff --git a/agent_sdks/python/src/a2ui/core/template/manager.py b/agent_sdks/python/src/a2ui/core/template/manager.py
index 235eb1880..a3b605fb9 100644
--- a/agent_sdks/python/src/a2ui/core/template/manager.py
+++ b/agent_sdks/python/src/a2ui/core/template/manager.py
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 from ..inference_strategy import InferenceStrategy
-from typing import List, Optional, Any
+from typing import List
 
 
 class A2uiTemplateManager(InferenceStrategy):
diff --git a/agent_sdks/python/tests/adk/a2a_extension/test_send_a2ui_to_client_toolset.py b/agent_sdks/python/tests/adk/a2a_extension/test_send_a2ui_to_client_toolset.py
index acfc1f0d9..1608f94f5 100644
--- a/agent_sdks/python/tests/adk/a2a_extension/test_send_a2ui_to_client_toolset.py
+++ b/agent_sdks/python/tests/adk/a2a_extension/test_send_a2ui_to_client_toolset.py
@@ -13,14 +13,12 @@
 # limitations under the License.
 
 import json
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import MagicMock, patch
 
 import pytest
 
 from a2a import types as a2a_types
 from a2ui.a2a import create_a2ui_part
-from google.adk.agents.invocation_context import InvocationContext
-from google.adk.events.event import Event
 
 from a2ui.adk.a2a_extension.send_a2ui_to_client_toolset import (
     A2uiEventConverter,
diff --git a/agent_sdks/python/tests/core/parser/test_parser.py b/agent_sdks/python/tests/core/parser/test_parser.py
index 3ba6d0762..f507d7f83 100644
--- a/agent_sdks/python/tests/core/parser/test_parser.py
+++ b/agent_sdks/python/tests/core/parser/test_parser.py
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 import pytest
-from a2ui.core.parser.parser import parse_response, ResponsePart
+from a2ui.core.parser.parser import parse_response
 from a2ui.core.schema.constants import A2UI_OPEN_TAG, A2UI_CLOSE_TAG
 
 
diff --git a/agent_sdks/python/tests/core/parser/test_payload_fixer.py b/agent_sdks/python/tests/core/parser/test_payload_fixer.py
index 2bd554d08..0916b0eff 100644
--- a/agent_sdks/python/tests/core/parser/test_payload_fixer.py
+++ b/agent_sdks/python/tests/core/parser/test_payload_fixer.py
@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
-import pytest
 from a2ui.core.parser.payload_fixer import (
     _remove_trailing_commas,
     _parse,
diff --git a/agent_sdks/python/tests/core/parser/test_streaming_v08.py b/agent_sdks/python/tests/core/parser/test_streaming_v08.py
index 51cfed5bc..bab29aacc 100644
--- a/agent_sdks/python/tests/core/parser/test_streaming_v08.py
+++ b/agent_sdks/python/tests/core/parser/test_streaming_v08.py
@@ -12,22 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
 import copy
-from unittest.mock import MagicMock
 import pytest
 from a2ui.core.schema.constants import (
     A2UI_OPEN_TAG,
     A2UI_CLOSE_TAG,
     VERSION_0_8,
-    SURFACE_ID_KEY,
     CATALOG_COMPONENTS_KEY,
 )
 from a2ui.core.parser.constants import (
     MSG_TYPE_SURFACE_UPDATE,
     MSG_TYPE_BEGIN_RENDERING,
-    MSG_TYPE_DELETE_SURFACE,
-    MSG_TYPE_DATA_MODEL_UPDATE,
 )
 from a2ui.core.schema.catalog import A2uiCatalog
 from a2ui.core.parser.streaming import A2uiStreamParser
diff --git a/agent_sdks/python/tests/core/parser/test_streaming_v09.py b/agent_sdks/python/tests/core/parser/test_streaming_v09.py
index 6255467e3..0e17e8e0a 100644
--- a/agent_sdks/python/tests/core/parser/test_streaming_v09.py
+++ b/agent_sdks/python/tests/core/parser/test_streaming_v09.py
@@ -12,22 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
 import copy
-from unittest.mock import MagicMock
 import pytest
 from a2ui.core.schema.constants import (
     A2UI_OPEN_TAG,
     A2UI_CLOSE_TAG,
     VERSION_0_9,
-    SURFACE_ID_KEY,
     CATALOG_COMPONENTS_KEY,
 )
 from a2ui.core.parser.constants import (
     MSG_TYPE_CREATE_SURFACE,
     MSG_TYPE_UPDATE_COMPONENTS,
-    MSG_TYPE_DELETE_SURFACE,
-    MSG_TYPE_DATA_MODEL_UPDATE,
 )
 from a2ui.core.schema.catalog import A2uiCatalog
 from a2ui.core.parser.streaming import A2uiStreamParser
diff --git a/agent_sdks/python/tests/core/schema/test_catalog.py b/agent_sdks/python/tests/core/schema/test_catalog.py
index 8c773ac34..b120a7902 100644
--- a/agent_sdks/python/tests/core/schema/test_catalog.py
+++ b/agent_sdks/python/tests/core/schema/test_catalog.py
@@ -12,10 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
-import os
 import pytest
-from typing import Any, Dict, List
 from a2ui.core.schema.catalog import A2uiCatalog
 from a2ui.core.schema.constants import (
     A2UI_SCHEMA_BLOCK_START,
diff --git a/agent_sdks/python/tests/core/schema/test_modifiers.py b/agent_sdks/python/tests/core/schema/test_modifiers.py
index bb927c60b..393d87a1e 100644
--- a/agent_sdks/python/tests/core/schema/test_modifiers.py
+++ b/agent_sdks/python/tests/core/schema/test_modifiers.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import pytest
 from unittest.mock import patch
 from a2ui.core.schema.constants import VERSION_0_8
 from a2ui.core.schema.manager import A2uiSchemaManager
diff --git a/agent_sdks/python/tests/core/schema/test_schema_manager.py b/agent_sdks/python/tests/core/schema/test_schema_manager.py
index 777832b59..de4c7fb41 100644
--- a/agent_sdks/python/tests/core/schema/test_schema_manager.py
+++ b/agent_sdks/python/tests/core/schema/test_schema_manager.py
@@ -11,9 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 import io
 import pytest
-import json
-import os
-from unittest.mock import patch, MagicMock, PropertyMock
+from unittest.mock import patch, MagicMock
 from a2ui.core.schema.manager import A2uiSchemaManager, A2uiCatalog, CatalogConfig
 from a2ui.basic_catalog import BasicCatalog
 from a2ui.basic_catalog.constants import BASIC_CATALOG_NAME
diff --git a/agent_sdks/python/tests/core/schema/test_validator.py b/agent_sdks/python/tests/core/schema/test_validator.py
index 9eb003b1b..dbae03452 100644
--- a/agent_sdks/python/tests/core/schema/test_validator.py
+++ b/agent_sdks/python/tests/core/schema/test_validator.py
@@ -12,12 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
 import copy
 import pytest
 from unittest.mock import MagicMock
-from a2ui.core.schema.manager import A2uiSchemaManager, A2uiCatalog, CatalogConfig
-from a2ui.core.schema.common_modifiers import remove_strict_validation
+from a2ui.core.schema.manager import A2uiCatalog
 from a2ui.core.schema.constants import VERSION_0_8, VERSION_0_9
 from a2ui.core.schema.validator import (
     _find_root_id as find_root_id,
diff --git a/samples/agent/adk/component_gallery/agent.py b/samples/agent/adk/component_gallery/agent.py
index e73401f16..d7f403b49 100644
--- a/samples/agent/adk/component_gallery/agent.py
+++ b/samples/agent/adk/component_gallery/agent.py
@@ -17,9 +17,8 @@
 import logging
 from collections.abc import AsyncIterable
 from typing import Any, Optional
-import json
 
-from a2a.types import DataPart, Part, TextPart
+from a2a.types import Part, TextPart
 from a2ui.core.schema.constants import A2UI_OPEN_TAG, A2UI_CLOSE_TAG
 from a2ui.a2a import create_a2ui_part, parse_response_to_parts
 
diff --git a/samples/agent/adk/component_gallery/agent_executor.py b/samples/agent/adk/component_gallery/agent_executor.py
index ef8afd8c8..f9394ab51 100644
--- a/samples/agent/adk/component_gallery/agent_executor.py
+++ b/samples/agent/adk/component_gallery/agent_executor.py
@@ -15,11 +15,10 @@
 """Agent executor for Component Gallery."""
 
 import logging
-import json
 from a2a.server.agent_execution import AgentExecutor, RequestContext
 from a2a.server.events import EventQueue
 from a2a.server.tasks import TaskUpdater
-from a2a.types import (DataPart, Part, TaskState, TextPart, AgentCard)
+from a2a.types import (DataPart, TaskState, TextPart, AgentCard)
 from a2a.utils import new_agent_parts_message, new_task
 from agent import ComponentGalleryAgent
 from a2ui.a2a import try_activate_a2ui_extension
diff --git a/samples/agent/adk/contact_lookup/agent.py b/samples/agent/adk/contact_lookup/agent.py
index a34d3a977..234450408 100644
--- a/samples/agent/adk/contact_lookup/agent.py
+++ b/samples/agent/adk/contact_lookup/agent.py
@@ -16,7 +16,6 @@
 import logging
 import os
 from collections.abc import AsyncIterable
-from dataclasses import dataclass
 from typing import Any, Dict, Optional
 
 import jsonschema
@@ -31,7 +30,6 @@
     AgentCapabilities,
     AgentCard,
     AgentSkill,
-    DataPart,
     Part,
     TextPart,
 )
@@ -41,9 +39,9 @@
 from tools import get_contact_info
 from a2ui.core.schema.constants import VERSION_0_8, VERSION_0_9, A2UI_OPEN_TAG, A2UI_CLOSE_TAG
 from a2ui.core.schema.manager import A2uiSchemaManager
-from a2ui.core.parser.parser import parse_response, ResponsePart
+from a2ui.core.parser.parser import parse_response
 from a2ui.basic_catalog.provider import BasicCatalog
-from a2ui.a2a import create_a2ui_part, get_a2ui_agent_extension, parse_response_to_parts
+from a2ui.a2a import get_a2ui_agent_extension, parse_response_to_parts
 
 logger = logging.getLogger(__name__)
 
diff --git a/samples/agent/adk/contact_lookup/agent_executor.py b/samples/agent/adk/contact_lookup/agent_executor.py
index f83df30fa..318376448 100644
--- a/samples/agent/adk/contact_lookup/agent_executor.py
+++ b/samples/agent/adk/contact_lookup/agent_executor.py
@@ -19,7 +19,6 @@
 from a2a.server.tasks import TaskUpdater
 from a2a.types import (
     DataPart,
-    Part,
     Task,
     TaskState,
     TextPart,
diff --git a/samples/agent/adk/contact_lookup/prompt_builder.py b/samples/agent/adk/contact_lookup/prompt_builder.py
index ab2070d9a..df36d7105 100644
--- a/samples/agent/adk/contact_lookup/prompt_builder.py
+++ b/samples/agent/adk/contact_lookup/prompt_builder.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from a2ui.core.schema.constants import VERSION_0_8, VERSION_0_9, A2UI_OPEN_TAG, A2UI_CLOSE_TAG
+from a2ui.core.schema.constants import VERSION_0_9, A2UI_OPEN_TAG, A2UI_CLOSE_TAG
 from a2ui.core.schema.manager import A2uiSchemaManager
 from a2ui.basic_catalog.provider import BasicCatalog
 
diff --git a/samples/agent/adk/custom-components-example/a2ui_examples.py b/samples/agent/adk/custom-components-example/a2ui_examples.py
index b628c601c..110d44bce 100644
--- a/samples/agent/adk/custom-components-example/a2ui_examples.py
+++ b/samples/agent/adk/custom-components-example/a2ui_examples.py
@@ -12,14 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
 import logging
 import os
 from pathlib import Path
 from typing import Optional
 from a2ui.core.schema.constants import VERSION_0_8, VERSION_0_9
 
-import jsonschema
 
 logger = logging.getLogger(__name__)
 
@@ -162,7 +160,6 @@ def load_close_modal_example(version: Optional[str] = None) -> list[dict]:
 
 def load_send_message_example(contact_name: str, version: Optional[str] = None) -> str:
   """Constructs the JSON string for the send message confirmation."""
-  from pathlib import Path
 
   examples_dir = Path(os.path.dirname(__file__)) / "examples" / version
   action_file = examples_dir / "action_confirmation.json"
diff --git a/samples/agent/adk/custom-components-example/agent.py b/samples/agent/adk/custom-components-example/agent.py
index 00428a5f6..04814da44 100644
--- a/samples/agent/adk/custom-components-example/agent.py
+++ b/samples/agent/adk/custom-components-example/agent.py
@@ -16,7 +16,6 @@
 import logging
 import os
 from collections.abc import AsyncIterable
-from dataclasses import dataclass
 from typing import Any, Dict, Optional
 
 import jsonschema
@@ -32,7 +31,6 @@
     AgentCapabilities,
     AgentCard,
     AgentSkill,
-    DataPart,
     Part,
     TextPart,
 )
@@ -43,9 +41,9 @@
 from a2ui.core.schema.constants import VERSION_0_8, VERSION_0_9, A2UI_OPEN_TAG, A2UI_CLOSE_TAG
 from a2ui.core.schema.common_modifiers import remove_strict_validation
 from a2ui.core.schema.manager import A2uiSchemaManager
-from a2ui.core.parser.parser import parse_response, ResponsePart
+from a2ui.core.parser.parser import parse_response
 from a2ui.basic_catalog.provider import BasicCatalog
-from a2ui.a2a import create_a2ui_part, get_a2ui_agent_extension, parse_response_to_parts
+from a2ui.a2a import get_a2ui_agent_extension, parse_response_to_parts
 
 logger = logging.getLogger(__name__)
 
@@ -182,7 +180,6 @@ async def _handle_action(
       return None
 
     from a2ui_examples import (
-        load_floor_plan_example,
         load_close_modal_example,
         load_send_message_example,
     )
@@ -237,7 +234,7 @@ async def _handle_action(
         }
 
       json_content = json.dumps(load_floor_plan_example(ui_version, html_content))
-      logger.info(f"--- ContactAgent.stream: Sending Floor Plan ---")
+      logger.info("--- ContactAgent.stream: Sending Floor Plan ---")
 
       final_response_content = (
           f"Here is the floor plan.\n{A2UI_OPEN_TAG}\n{json_content}\n{A2UI_CLOSE_TAG}"
diff --git a/samples/agent/adk/custom-components-example/agent_executor.py b/samples/agent/adk/custom-components-example/agent_executor.py
index ad249239c..b9def206d 100644
--- a/samples/agent/adk/custom-components-example/agent_executor.py
+++ b/samples/agent/adk/custom-components-example/agent_executor.py
@@ -13,14 +13,12 @@
 # limitations under the License.
 
 import logging
-import time
 
 from a2a.server.agent_execution import AgentExecutor, RequestContext
 from a2a.server.events import EventQueue
 from a2a.server.tasks import TaskUpdater
 from a2a.types import (
     DataPart,
-    Part,
     Task,
     TaskState,
     TextPart,
diff --git a/samples/agent/adk/custom-components-example/floor_plan_server.py b/samples/agent/adk/custom-components-example/floor_plan_server.py
index 3b206a9e6..dc1bb6e50 100644
--- a/samples/agent/adk/custom-components-example/floor_plan_server.py
+++ b/samples/agent/adk/custom-components-example/floor_plan_server.py
@@ -12,9 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import asyncio
 from mcp.server import Server
-from mcp.types import Resource, TextContent
+from mcp.types import Resource
 
 app = Server("floor-plan-server")
 
diff --git a/samples/agent/adk/custom-components-example/prompt_builder.py b/samples/agent/adk/custom-components-example/prompt_builder.py
index 172e53be4..d98245740 100644
--- a/samples/agent/adk/custom-components-example/prompt_builder.py
+++ b/samples/agent/adk/custom-components-example/prompt_builder.py
@@ -14,12 +14,9 @@
 
 import json
 
-from a2ui.core.schema.constants import VERSION_0_8, VERSION_0_9, A2UI_OPEN_TAG, A2UI_CLOSE_TAG
+from a2ui.core.schema.constants import VERSION_0_9, A2UI_OPEN_TAG, A2UI_CLOSE_TAG
 from a2ui.core.schema.manager import A2uiSchemaManager, CatalogConfig
-from a2ui.basic_catalog.provider import BasicCatalog
 from a2ui.core.schema.common_modifiers import remove_strict_validation
-from a2ui.core.schema.catalog_provider import A2uiCatalogProvider, FileSystemCatalogProvider
-from typing import Dict, Any
 
 ROLE_DESCRIPTION = (
     "You are a helpful contact lookup assistant. Your final output MUST be a a2ui UI"
diff --git a/samples/agent/adk/mcp_app_proxy/__main__.py b/samples/agent/adk/mcp_app_proxy/__main__.py
index d6def88bc..88447481a 100644
--- a/samples/agent/adk/mcp_app_proxy/__main__.py
+++ b/samples/agent/adk/mcp_app_proxy/__main__.py
@@ -15,27 +15,15 @@
 from a2a.server.apps import A2AStarletteApplication
 from a2a.server.request_handlers import DefaultRequestHandler
 from a2a.server.tasks import InMemoryTaskStore
-from a2ui.core.schema.constants import VERSION_0_8
-from a2ui.core.schema.manager import A2uiSchemaManager, CatalogConfig
 from agent import McpAppProxyAgent
-from agent_executor import McpAppProxyAgentExecutor, get_a2ui_enabled, get_a2ui_catalog, get_a2ui_examples
+from agent_executor import McpAppProxyAgentExecutor
 from dotenv import load_dotenv
-from google.adk.artifacts import InMemoryArtifactService
-from google.adk.memory.in_memory_memory_service import InMemoryMemoryService
 from google.adk.models.lite_llm import LiteLlm
-from google.adk.runners import Runner
-from google.adk.sessions.in_memory_session_service import InMemorySessionService
-from google.adk.tools.tool_context import ToolContext
-from mcp import ClientSession
-from mcp.client.sse import sse_client
 from starlette.middleware.cors import CORSMiddleware
-import anyio
 import click
-import httpx
 import logging
 import os
 import traceback
-import urllib.parse
 
 load_dotenv()
 
diff --git a/samples/agent/adk/mcp_app_proxy/agent.py b/samples/agent/adk/mcp_app_proxy/agent.py
index 0fa60329b..c8d794119 100644
--- a/samples/agent/adk/mcp_app_proxy/agent.py
+++ b/samples/agent/adk/mcp_app_proxy/agent.py
@@ -12,13 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
 import logging
 from typing import Any, ClassVar, Optional, Dict
 
 from a2a.types import AgentCapabilities, AgentCard, AgentSkill
 from a2ui.a2a import get_a2ui_agent_extension
-from a2ui.adk.a2a_extension.send_a2ui_to_client_toolset import A2uiEnabledProvider, A2uiCatalogProvider, A2uiExamplesProvider, SendA2uiToClientToolset
 from a2ui.core.schema.manager import A2uiSchemaManager, VERSION_0_8, VERSION_0_9, CatalogConfig
 from google.adk.agents.llm_agent import LlmAgent
 from google.adk.artifacts import InMemoryArtifactService
@@ -27,7 +25,6 @@
 from google.adk.runners import Runner
 from google.adk.sessions import InMemorySessionService
 from google.genai import types
-from pydantic import PrivateAttr
 from tools import get_calculator_app, calculate_via_mcp, get_pong_app_a2ui_json, score_update
 from agent_executor import get_a2ui_enabled, get_a2ui_catalog, get_a2ui_examples
 
diff --git a/samples/agent/adk/mcp_app_proxy/agent_executor.py b/samples/agent/adk/mcp_app_proxy/agent_executor.py
index 7a5e58b47..76bdd6123 100644
--- a/samples/agent/adk/mcp_app_proxy/agent_executor.py
+++ b/samples/agent/adk/mcp_app_proxy/agent_executor.py
@@ -16,11 +16,9 @@
 from typing import override
 
 from a2a.server.agent_execution import RequestContext
-from a2a.types import AgentCapabilities, AgentCard, AgentExtension, AgentSkill
 from a2ui.a2a import try_activate_a2ui_extension
 from a2ui.adk.a2a_extension.send_a2ui_to_client_toolset import A2uiEventConverter
 from a2ui.core.schema.constants import A2UI_CLIENT_CAPABILITIES_KEY
-from a2ui.core.schema.manager import A2uiSchemaManager
 from google.adk.a2a.converters.request_converter import AgentRunRequest
 from google.adk.a2a.executor.a2a_agent_executor import A2aAgentExecutor
 from google.adk.a2a.executor.a2a_agent_executor import A2aAgentExecutorConfig
diff --git a/samples/agent/adk/orchestrator/agent.py b/samples/agent/adk/orchestrator/agent.py
index b4c804926..f7ac217a1 100644
--- a/samples/agent/adk/orchestrator/agent.py
+++ b/samples/agent/adk/orchestrator/agent.py
@@ -37,7 +37,7 @@
 from a2a.client.client import ClientConfig as A2AClientConfig
 from a2a.client.client_factory import ClientFactory as A2AClientFactory
 from a2ui.a2a import *
-from a2a.types import AgentCapabilities, AgentCard, AgentExtension
+from a2a.types import AgentCapabilities, AgentCard
 from a2ui.core.schema.constants import A2UI_CLIENT_CAPABILITIES_KEY
 
 logger = logging.getLogger(__name__)
diff --git a/samples/agent/adk/orchestrator/agent_executor.py b/samples/agent/adk/orchestrator/agent_executor.py
index 8bb39b663..58a06fd3e 100644
--- a/samples/agent/adk/orchestrator/agent_executor.py
+++ b/samples/agent/adk/orchestrator/agent_executor.py
@@ -23,7 +23,6 @@
 from a2a.server.agent_execution import RequestContext
 from google.adk.agents.llm_agent import LlmAgent
 from google.adk.artifacts import InMemoryArtifactService
-from a2a.server.events.event_queue import EventQueue
 from google.adk.memory.in_memory_memory_service import InMemoryMemoryService
 from google.adk.runners import Runner
 from google.adk.sessions import InMemorySessionService
@@ -41,7 +40,6 @@
 from google.adk.a2a.converters import part_converter
 from subagent_route_manager import SubagentRouteManager
 
-from agent import OrchestratorAgent
 import part_converters
 
 logger = logging.getLogger(__name__)
diff --git a/samples/agent/adk/restaurant_finder/agent.py b/samples/agent/adk/restaurant_finder/agent.py
index bbfe87950..b5706e1b2 100644
--- a/samples/agent/adk/restaurant_finder/agent.py
+++ b/samples/agent/adk/restaurant_finder/agent.py
@@ -23,7 +23,6 @@
     AgentCapabilities,
     AgentCard,
     AgentSkill,
-    DataPart,
     Part,
     TextPart,
 )
@@ -42,10 +41,10 @@
 from tools import get_restaurants
 from a2ui.core.schema.constants import VERSION_0_8, VERSION_0_9, A2UI_OPEN_TAG, A2UI_CLOSE_TAG
 from a2ui.core.schema.manager import A2uiSchemaManager
-from a2ui.core.parser.parser import parse_response, ResponsePart
+from a2ui.core.parser.parser import parse_response
 from a2ui.basic_catalog.provider import BasicCatalog
 from a2ui.core.schema.common_modifiers import remove_strict_validation
-from a2ui.a2a import create_a2ui_part, get_a2ui_agent_extension, parse_response_to_parts
+from a2ui.a2a import get_a2ui_agent_extension, parse_response_to_parts
 
 logger = logging.getLogger(__name__)
 
diff --git a/samples/agent/adk/restaurant_finder/agent_executor.py b/samples/agent/adk/restaurant_finder/agent_executor.py
index c6e34d140..f616be38f 100644
--- a/samples/agent/adk/restaurant_finder/agent_executor.py
+++ b/samples/agent/adk/restaurant_finder/agent_executor.py
@@ -19,7 +19,6 @@
 from a2a.server.tasks import TaskUpdater
 from a2a.types import (
     DataPart,
-    Part,
     Task,
     TaskState,
     TextPart,
diff --git a/samples/agent/adk/rizzcharts/__main__.py b/samples/agent/adk/rizzcharts/__main__.py
index 6945df7d9..cd1b94d08 100644
--- a/samples/agent/adk/rizzcharts/__main__.py
+++ b/samples/agent/adk/rizzcharts/__main__.py
@@ -14,7 +14,6 @@
 
 import logging
 import os
-import pathlib
 import traceback
 
 import click
diff --git a/samples/agent/adk/rizzcharts/agent.py b/samples/agent/adk/rizzcharts/agent.py
index 313408eab..1d46bfb2b 100644
--- a/samples/agent/adk/rizzcharts/agent.py
+++ b/samples/agent/adk/rizzcharts/agent.py
@@ -12,22 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
 import logging
-from pathlib import Path
-import pkgutil
 from typing import Any, ClassVar, Dict, Optional
 from a2a.types import AgentCapabilities, AgentCard, AgentSkill
 from a2ui.a2a import get_a2ui_agent_extension
-from a2ui.adk.a2a_extension.send_a2ui_to_client_toolset import SendA2uiToClientToolset, A2uiEnabledProvider, A2uiCatalogProvider, A2uiExamplesProvider
+from a2ui.adk.a2a_extension.send_a2ui_to_client_toolset import SendA2uiToClientToolset
 from a2ui.core.schema.manager import A2uiSchemaManager, CatalogConfig
 from a2ui.basic_catalog.provider import BasicCatalog
 from a2ui.core.schema.constants import VERSION_0_8, VERSION_0_9
 from google.adk.agents.llm_agent import LlmAgent
-from google.adk.agents.readonly_context import ReadonlyContext
 from google.adk.planners.built_in_planner import BuiltInPlanner
 from google.genai import types
-from pydantic import PrivateAttr
 from google.adk.sessions.in_memory_session_service import InMemorySessionService
 from google.adk.artifacts import InMemoryArtifactService
 from google.adk.memory.in_memory_memory_service import InMemoryMemoryService
diff --git a/samples/agent/adk/rizzcharts/agent_executor.py b/samples/agent/adk/rizzcharts/agent_executor.py
index eaf09983e..73ec14a49 100644
--- a/samples/agent/adk/rizzcharts/agent_executor.py
+++ b/samples/agent/adk/rizzcharts/agent_executor.py
@@ -13,20 +13,14 @@
 # limitations under the License.
 
 import logging
-from pathlib import Path
 from typing import override
 
 from a2a.server.agent_execution import RequestContext
-from a2a.types import AgentCapabilities, AgentCard, AgentExtension, AgentSkill
-from a2ui.a2a import get_a2ui_agent_extension
 from a2ui.a2a import try_activate_a2ui_extension
 from a2ui.adk.a2a_extension.send_a2ui_to_client_toolset import (
     A2uiEventConverter,
-    A2uiPartConverter,
-    SendA2uiToClientToolset,
 )
 from a2ui.core.schema.constants import A2UI_CLIENT_CAPABILITIES_KEY
-from a2ui.core.schema.manager import A2uiSchemaManager
 from google.adk.a2a.converters.request_converter import AgentRunRequest
 from google.adk.a2a.executor.a2a_agent_executor import A2aAgentExecutor
 from google.adk.a2a.executor.a2a_agent_executor import A2aAgentExecutorConfig
diff --git a/samples/agent/adk/tests/test_examples_validation.py b/samples/agent/adk/tests/test_examples_validation.py
index 0f179e673..83787c713 100644
--- a/samples/agent/adk/tests/test_examples_validation.py
+++ b/samples/agent/adk/tests/test_examples_validation.py
@@ -15,14 +15,12 @@
 import os
 import json
 from pathlib import Path
-from typing import Dict, Any
 import pytest
 
 from a2ui.core.schema.constants import VERSION_0_9
 from a2ui.core.schema.manager import A2uiSchemaManager, CatalogConfig
 from a2ui.basic_catalog.provider import BasicCatalog
 from a2ui.core.schema.common_modifiers import remove_strict_validation
-from a2ui.core.schema.catalog_provider import A2uiCatalogProvider
 
 
 ROOT_DIR = Path(__file__).parent.parent.parent.parent.parent  # a2ui root
diff --git a/samples/agent/mcp/a2ui-over-mcp-recipe/server.py b/samples/agent/mcp/a2ui-over-mcp-recipe/server.py
index 27b7d26ec..f68c0930a 100644
--- a/samples/agent/mcp/a2ui-over-mcp-recipe/server.py
+++ b/samples/agent/mcp/a2ui-over-mcp-recipe/server.py
@@ -12,16 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import json
+import pathlib
 from typing import Any
+
 import anyio
 import click
-import pathlib
 import jsonschema
-import json
 import mcp.types as types
+from a2ui.core.schema.utils import wrap_as_json_array
 from mcp.server.lowlevel import Server
 from starlette.requests import Request
-from a2ui.core.schema.utils import wrap_as_json_array
 
 
 def load_a2ui_schema() -> dict[str, Any]:
@@ -82,10 +83,10 @@ async def handle_call_tool(name: str, arguments: dict[str, Any]) -> dict[str, An
       return {"events": recipe_a2ui_json}
 
     if name == "send_a2ui_user_action":
-      return {"response": f"Received A2UI user action", "args": arguments}
+      return {"response": "Received A2UI user action", "args": arguments}
 
     if name == "send_a2ui_error":
-      return {"response": f"Received A2UI error", "args": arguments}
+      return {"response": "Received A2UI error", "args": arguments}
 
     raise ValueError(f"Unknown tool: {name}")
 
@@ -123,10 +124,10 @@ async def list_tools() -> list[types.Tool]:
   if transport == "sse":
     from mcp.server.sse import SseServerTransport
     from starlette.applications import Starlette
-    from starlette.responses import Response
-    from starlette.routing import Mount, Route
     from starlette.middleware import Middleware
     from starlette.middleware.cors import CORSMiddleware
+    from starlette.responses import Response
+    from starlette.routing import Mount, Route
 
     sse = SseServerTransport("/messages/")
 
diff --git a/samples/agent/mcp/mcp-apps-calculator/server.py b/samples/agent/mcp/mcp-apps-calculator/server.py
index 1b18a957f..c4ee2424f 100644
--- a/samples/agent/mcp/mcp-apps-calculator/server.py
+++ b/samples/agent/mcp/mcp-apps-calculator/server.py
@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import pathlib
 from typing import Any
+
 import anyio
 import click
-import pathlib
 import mcp.types as types
 from mcp.server.lowlevel import Server
 from starlette.requests import Request
@@ -129,10 +130,10 @@ async def list_tools() -> list[types.Tool]:
   if transport == "sse":
     from mcp.server.sse import SseServerTransport
     from starlette.applications import Starlette
-    from starlette.responses import Response
-    from starlette.routing import Mount, Route
     from starlette.middleware import Middleware
     from starlette.middleware.cors import CORSMiddleware
+    from starlette.responses import Response
+    from starlette.routing import Mount, Route
 
     sse = SseServerTransport("/messages/")
 
diff --git a/samples/personalized_learning/Quickstart.ipynb b/samples/personalized_learning/Quickstart.ipynb
index 0996fee9d..d68a220d1 100644
--- a/samples/personalized_learning/Quickstart.ipynb
+++ b/samples/personalized_learning/Quickstart.ipynb
@@ -106,7 +106,6 @@
    "outputs": [],
    "source": [
     "import subprocess\n",
-    "import sys\n",
     "\n",
     "# Validate configuration\n",
     "if PROJECT_ID == \"your-project-id\" or not PROJECT_ID:\n",
diff --git a/samples/personalized_learning/agent/download_openstax.py b/samples/personalized_learning/agent/download_openstax.py
index 33d354a98..d3fe0406a 100644
--- a/samples/personalized_learning/agent/download_openstax.py
+++ b/samples/personalized_learning/agent/download_openstax.py
@@ -70,7 +70,7 @@ def clone_repo(target_dir: str) -> bool:
     Returns:
         True if successful, False otherwise
     """
-    print(f"Cloning repository (shallow clone)...")
+    print("Cloning repository (shallow clone)...")
     print(f"  Source: {GITHUB_REPO}")
     print(f"  Target: {target_dir}")
 
@@ -285,7 +285,7 @@ def main():
         needed_modules = all_modules_set & available_modules
         missing_modules = all_modules_set - available_modules
 
-        print(f"\nModule status:")
+        print("\nModule status:")
         print(f"  Needed: {len(all_modules)}")
         print(f"  Available in repo: {len(needed_modules)}")
         if missing_modules:
diff --git a/samples/personalized_learning/agent/openstax_modules.py b/samples/personalized_learning/agent/openstax_modules.py
index 8a0714599..7b5d6fb42 100644
--- a/samples/personalized_learning/agent/openstax_modules.py
+++ b/samples/personalized_learning/agent/openstax_modules.py
@@ -30,7 +30,6 @@
 """
 
 import re
-from typing import Optional
 
 # Base URL for OpenStax textbook
 OPENSTAX_BASE_URL = "https://openstax.org/books/biology-ap-courses/pages"
diff --git a/specification/scripts/validate.py b/specification/scripts/validate.py
index 8890cd8fe..907ae8c01 100755
--- a/specification/scripts/validate.py
+++ b/specification/scripts/validate.py
@@ -80,7 +80,7 @@ def validate_messages(root_schema, example_files, refs=None, temp_dir="temp_val"
             print(output.strip())
             success = False
         else:
-            print(f"    [PASS]")
+            print("    [PASS]")
 
     return success
 
diff --git a/specification/v0_10/test/run_tests.py b/specification/v0_10/test/run_tests.py
index 6d70f6be8..523833b15 100755
--- a/specification/v0_10/test/run_tests.py
+++ b/specification/v0_10/test/run_tests.py
@@ -150,7 +150,7 @@ def validate_jsonl_example(jsonl_path):
         return 0, 1
 
     print(f"\nValidating JSONL example: {os.path.basename(jsonl_path)}")
-    print(f"Target Schema: server_to_client.json")
+    print("Target Schema: server_to_client.json")
 
     passed = 0
     failed = 0
diff --git a/specification/v0_9/test/run_tests.py b/specification/v0_9/test/run_tests.py
index 2df780450..c1f75fd8a 100755
--- a/specification/v0_9/test/run_tests.py
+++ b/specification/v0_9/test/run_tests.py
@@ -137,7 +137,7 @@ def validate_jsonl_example(jsonl_path):
         return 0, 1
 
     print(f"\nValidating JSONL example: {os.path.basename(jsonl_path)}")
-    print(f"Target Schema: server_to_client.json")
+    print("Target Schema: server_to_client.json")
 
     passed = 0
     failed = 0
diff --git a/tools/build_catalog/tests/test_assemble_catalog.py b/tools/build_catalog/tests/test_assemble_catalog.py
index de1e8ed15..d7351dba6 100644
--- a/tools/build_catalog/tests/test_assemble_catalog.py
+++ b/tools/build_catalog/tests/test_assemble_catalog.py
@@ -15,7 +15,6 @@
 import unittest
 from unittest.mock import patch, MagicMock
 import json
-import os
 from pathlib import Path
 import sys