diff --git a/backend/tests/agent/test_checklist_verifier.py b/backend/tests/agent/test_checklist_verifier.py
index 37cfe87e1..2271e1bd7 100644
--- a/backend/tests/agent/test_checklist_verifier.py
+++ b/backend/tests/agent/test_checklist_verifier.py
@@ -1,9 +1,11 @@
 
 import unittest
 from unittest.mock import MagicMock, patch
+
 from agent.nodes import checklist_verifier
 from agent.state import OverallState
 
+
 class TestChecklistVerifier(unittest.TestCase):
     def setUp(self):
         self.mock_config = {"configurable": {"thread_id": "1", "answer_model": "test-model"}}
diff --git a/backend/tests/agent/test_middleware_security.py b/backend/tests/agent/test_middleware_security.py
index d9c0dd6a6..0de1fb072 100644
--- a/backend/tests/agent/test_middleware_security.py
+++ b/backend/tests/agent/test_middleware_security.py
@@ -1,8 +1,10 @@
-import pytest
 from unittest.mock import MagicMock
-from fastapi.testclient import TestClient
+
+import pytest
 from fastapi import Request, Response
-from agent.app import app, ContentSizeLimitMiddleware
+from fastapi.testclient import TestClient
+
+from agent.app import ContentSizeLimitMiddleware, app
 
 # Initialize TestClient with a trusted host (localhost) to pass TrustedHostMiddleware
 client = TestClient(app, base_url="http://localhost")
diff --git a/backend/tests/agent/test_orchestration.py b/backend/tests/agent/test_orchestration.py
index 9285b9f8a..0222940e7 100644
--- a/backend/tests/agent/test_orchestration.py
+++ b/backend/tests/agent/test_orchestration.py
@@ -7,22 +7,22 @@
 - Orchestrated graph construction
 """
 
+from typing import Any, Dict
+from unittest.mock import AsyncMock, MagicMock, patch
+
 import pytest
-from unittest.mock import MagicMock, patch, AsyncMock
-from typing import Dict, Any
+from langchain_core.messages import AIMessage, HumanMessage
 
 from agent.orchestration import (
-    ToolRegistry,
     AgentPool,
-    ToolSpec,
     AgentSpec,
+    ToolRegistry,
+    ToolSpec,
+    build_orchestrated_graph,
     create_coordinator_node,
     create_task_router,
-    build_orchestrated_graph,
 )
 from agent.state import OverallState
-from langchain_core.messages import HumanMessage, AIMessage
-
 
 # =============================================================================
 # ToolRegistry Tests
diff --git a/backend/tests/agent/test_rag.py b/backend/tests/agent/test_rag.py
index 30c63fd2e..6e5a26a93 100644
--- a/backend/tests/agent/test_rag.py
+++ b/backend/tests/agent/test_rag.py
@@ -1,9 +1,11 @@
 
-import pytest
+import importlib
 import sys
-import numpy as np
 from unittest.mock import MagicMock, patch
-import importlib
+
+import numpy as np
+import pytest
+
 
 # Fixture to mock dependencies before importing the module under test
 @pytest.fixture
diff --git a/backend/tests/agent/test_rate_limiter.py b/backend/tests/agent/test_rate_limiter.py
index efc333959..7bd68851e 100644
--- a/backend/tests/agent/test_rate_limiter.py
+++ b/backend/tests/agent/test_rate_limiter.py
@@ -1,10 +1,12 @@
 """Tests for RateLimiter."""
 
 import unittest
+from datetime import date, datetime, timedelta
 from unittest.mock import MagicMock, patch
-from datetime import datetime, date, timedelta
 from zoneinfo import ZoneInfo
-from agent.rate_limiter import RateLimiter, PACIFIC_TZ
+
+from agent.rate_limiter import PACIFIC_TZ, RateLimiter
+
 
 class TestRateLimiter(unittest.TestCase):
     def test_daily_reset_logic(self):
diff --git a/backend/tests/agent/test_rate_limiter_proxy.py b/backend/tests/agent/test_rate_limiter_proxy.py
index 860ce6627..1b509f7c7 100644
--- a/backend/tests/agent/test_rate_limiter_proxy.py
+++ b/backend/tests/agent/test_rate_limiter_proxy.py
@@ -1,9 +1,11 @@
+from unittest.mock import patch
+
 import pytest
 from fastapi.testclient import TestClient
-from unittest.mock import patch
+from starlette.responses import PlainTextResponse
+
 from agent.app import app
 from agent.security import RateLimitMiddleware
-from starlette.responses import PlainTextResponse
 
 # ----------------------------------------------------------------------
 # 1. Integration Test with FastAPI App
diff --git a/backend/tests/agent/test_supervisor_llm.py b/backend/tests/agent/test_supervisor_llm.py
index 0b4f2087d..dc013b793 100644
--- a/backend/tests/agent/test_supervisor_llm.py
+++ b/backend/tests/agent/test_supervisor_llm.py
@@ -1,11 +1,14 @@
-import pytest
-from unittest.mock import patch, MagicMock
 import dataclasses
-from agent.state import OverallState
+from unittest.mock import MagicMock, patch
+
+import pytest
+from langchain_core.messages import AIMessage
+from langchain_core.runnables import RunnableConfig
+
 from agent.graphs import supervisor
 from agent.graphs.supervisor import compress_context
-from langchain_core.runnables import RunnableConfig
-from langchain_core.messages import AIMessage
+from agent.state import OverallState
+
 
 @pytest.fixture
 def enable_compression():
diff --git a/backend/tests/conftest.py b/backend/tests/conftest.py
index cc8f91187..baa7353c6 100644
--- a/backend/tests/conftest.py
+++ b/backend/tests/conftest.py
@@ -3,13 +3,13 @@
 This module provides reusable fixtures that can be used across all test files.
 Fixtures are designed to be path-insensitive and robust to minor code changes.
 """
+import os
 import pathlib
 import sys
-from typing import Any, Dict, List
 from types import SimpleNamespace
+from typing import Any, Dict, List
 
 import pytest
-import os
 
 # Set dummy API key before any imports that might use it
 os.environ["GEMINI_API_KEY"] = "dummy_key_for_tests"
diff --git a/backend/tests/evaluators.py b/backend/tests/evaluators.py
index 804485bcf..1721639d8 100644
--- a/backend/tests/evaluators.py
+++ b/backend/tests/evaluators.py
@@ -4,12 +4,14 @@
 structured grading of agent outputs using a Judge LLM (Gemini 2.5 Pro).
 """
 
-from typing import Dict, Any, Optional, List
-from pydantic import BaseModel, Field
-from langchain_google_genai import ChatGoogleGenerativeAI
+import os
+from typing import Any, Dict, List, Optional
+
 from langchain_core.prompts import ChatPromptTemplate
+from langchain_google_genai import ChatGoogleGenerativeAI
+from pydantic import BaseModel, Field
+
 from agent.models import GEMINI_PRO
-import os
 
 # Module-level cache for the judge model instance
 _judge_model_cache: Optional[ChatGoogleGenerativeAI] = None
diff --git a/backend/tests/test_configuration.py b/backend/tests/test_configuration.py
index f394cc5f2..094cd83ab 100644
--- a/backend/tests/test_configuration.py
+++ b/backend/tests/test_configuration.py
@@ -8,11 +8,11 @@
 
 from agent.configuration import Configuration
 from agent.models import (
-    TEST_MODEL,
-    GEMINI_PRO,
+    DEFAULT_ANSWER_MODEL,
     DEFAULT_QUERY_MODEL,
     DEFAULT_REFLECTION_MODEL,
-    DEFAULT_ANSWER_MODEL,
+    GEMINI_PRO,
+    TEST_MODEL,
 )
 
 
diff --git a/backend/tests/test_gemma_compatibility.py b/backend/tests/test_gemma_compatibility.py
index e561d4d9c..1ebdf00d6 100644
--- a/backend/tests/test_gemma_compatibility.py
+++ b/backend/tests/test_gemma_compatibility.py
@@ -7,16 +7,17 @@
 3. Robustness against token limit behaviors typical of smaller models.
 """
 
+from unittest.mock import ANY, MagicMock, patch
+
 import pytest
-from unittest.mock import MagicMock, patch, ANY
-from langchain_core.runnables import RunnableConfig
 from langchain_core.messages import AIMessage, HumanMessage
+from langchain_core.runnables import RunnableConfig
 
 from agent.models import GEMMA_2_27B_IT, GEMMA_3_27B_IT
 from agent.nodes import (
+    denoising_refiner,
     generate_plan,
     web_research,
-    denoising_refiner,
 )
 from agent.state import OverallState
 
diff --git a/backend/tests/test_graph_mock.py b/backend/tests/test_graph_mock.py
index a1d1f9bbf..770e66cb7 100644
--- a/backend/tests/test_graph_mock.py
+++ b/backend/tests/test_graph_mock.py
@@ -1,8 +1,16 @@
+from unittest.mock import MagicMock, Mock, patch
+
 import pytest
-from unittest.mock import Mock, patch, MagicMock
-from agent.nodes import generate_plan, web_research, reflection, denoising_refiner, load_context
-from langchain_core.messages import HumanMessage, AIMessage
+from langchain_core.messages import AIMessage, HumanMessage
+
 from agent.models import TEST_MODEL
+from agent.nodes import (
+    denoising_refiner,
+    generate_plan,
+    load_context,
+    reflection,
+    web_research,
+)
 
 TEST_MODEL = "gemma-3-27b-it"
 
diff --git a/backend/tests/test_input_validation.py b/backend/tests/test_input_validation.py
index 4baf043d0..32708b750 100644
--- a/backend/tests/test_input_validation.py
+++ b/backend/tests/test_input_validation.py
@@ -1,12 +1,13 @@
-import unittest
-import sys
 import os
+import sys
+import unittest
 
 # Add backend/src to python path
 sys.path.append(os.path.join(os.path.dirname(__file__), "../src"))
 
 from agent.app import InvokeRequest
 
+
 class TestDoS(unittest.TestCase):
     def test_large_initial_query_count(self):
         """
diff --git a/backend/tests/test_ipv6_rate_limit.py b/backend/tests/test_ipv6_rate_limit.py
index da5fa3fc7..a9315b04e 100644
--- a/backend/tests/test_ipv6_rate_limit.py
+++ b/backend/tests/test_ipv6_rate_limit.py
@@ -1,8 +1,11 @@
 
+from unittest.mock import AsyncMock, MagicMock
+
 import pytest
-from unittest.mock import MagicMock, AsyncMock
+
 from agent.security import RateLimitMiddleware
 
+
 class MockApp:
     pass
 
diff --git a/backend/tests/test_kaggle_integration.py b/backend/tests/test_kaggle_integration.py
index f0122b3c8..894bc155f 100644
--- a/backend/tests/test_kaggle_integration.py
+++ b/backend/tests/test_kaggle_integration.py
@@ -3,9 +3,16 @@
 Unit tests for backend/examples/kaggle_integration.py
 """
 
+from unittest.mock import MagicMock, patch
+
 import pytest
-from unittest.mock import patch, MagicMock
-from examples.kaggle_integration import KaggleModelLoader, KaggleHuggingFaceClient, SimpleReActAgent, BaseLLMClient
+
+from examples.kaggle_integration import (
+    BaseLLMClient,
+    KaggleHuggingFaceClient,
+    KaggleModelLoader,
+    SimpleReActAgent,
+)
 
 # =============================================================================
 # Tests for KaggleModelLoader
diff --git a/backend/tests/test_mcp.py b/backend/tests/test_mcp.py
index 150580cec..4d93cfee3 100644
--- a/backend/tests/test_mcp.py
+++ b/backend/tests/test_mcp.py
@@ -1,5 +1,7 @@
+from unittest.mock import AsyncMock, MagicMock, patch
+
 import pytest
-from unittest.mock import MagicMock, patch, AsyncMock
+
 from agent.tools_and_schemas import get_tools_from_mcp
 
 # Fine-grained implementation guide for MCP Tests:
diff --git a/backend/tests/test_mcp_config.py b/backend/tests/test_mcp_config.py
index bb22fbe7f..b6a96bf8f 100644
--- a/backend/tests/test_mcp_config.py
+++ b/backend/tests/test_mcp_config.py
@@ -1,7 +1,9 @@
 import os
 import unittest
 from unittest import mock
-from agent.mcp_config import load_mcp_settings, validate, MCPSettings
+
+from agent.mcp_config import MCPSettings, load_mcp_settings, validate
+
 
 class TestMCPSettings(unittest.TestCase):
     def test_default_settings(self):
diff --git a/backend/tests/test_mcp_tools.py b/backend/tests/test_mcp_tools.py
index 1d51f4e93..33f0f92a2 100644
--- a/backend/tests/test_mcp_tools.py
+++ b/backend/tests/test_mcp_tools.py
@@ -1,8 +1,11 @@
 import asyncio
-import pytest
 from unittest.mock import MagicMock, patch
-from agent.tools_and_schemas import get_tools_from_mcp
+
+import pytest
+
 from agent.mcp_config import MCPSettings
+from agent.tools_and_schemas import get_tools_from_mcp
+
 
 @pytest.mark.asyncio
 async def test_get_tools_from_mcp_disabled():
diff --git a/backend/tests/test_memory_tools.py b/backend/tests/test_memory_tools.py
index 43a26729a..b603766f3 100644
--- a/backend/tests/test_memory_tools.py
+++ b/backend/tests/test_memory_tools.py
@@ -1,8 +1,10 @@
-import unittest
-from agent.memory_tools import save_plan_tool, load_plan_tool
-from agent.persistence import PLAN_DIR
 import os
 import shutil
+import unittest
+
+from agent.memory_tools import load_plan_tool, save_plan_tool
+from agent.persistence import PLAN_DIR
+
 
 class TestMemoryTools(unittest.TestCase):
     def setUp(self):
diff --git a/backend/tests/test_nodes.py b/backend/tests/test_nodes.py
index eafb5ee3b..9e009d576 100644
--- a/backend/tests/test_nodes.py
+++ b/backend/tests/test_nodes.py
@@ -12,28 +12,30 @@
 - Edge cases and error handling
 """
 
-import pytest
 import dataclasses
-from unittest.mock import Mock, patch, MagicMock, AsyncMock
-from langchain_core.runnables import RunnableConfig
+from unittest.mock import AsyncMock, MagicMock, Mock, patch
+
+import pytest
 from langchain_core.messages import AIMessage, HumanMessage
+from langchain_core.runnables import RunnableConfig
 
-from config.app_config import AppConfig, config as real_config
-from agent.state import OverallState
 from agent import nodes
+from agent.models import TEST_MODEL
 from agent.nodes import (
+    content_reader,
+    denoising_refiner,
+    execution_router,
     generate_plan,
     planning_mode,
     planning_wait,
-    web_research,
-    validate_web_results,
     reflection,
-    denoising_refiner,
-    content_reader,
     select_next_task,
-    execution_router,
+    validate_web_results,
+    web_research,
 )
-from agent.models import TEST_MODEL
+from agent.state import OverallState
+from config.app_config import AppConfig
+from config.app_config import config as real_config
 
 
 # Fixtures
diff --git a/backend/tests/test_persistence.py b/backend/tests/test_persistence.py
index 4b600c297..192cc64ce 100644
--- a/backend/tests/test_persistence.py
+++ b/backend/tests/test_persistence.py
@@ -5,6 +5,7 @@
 """
 import json
 import os
+
 import pytest
 
 
diff --git a/backend/tests/test_planning.py b/backend/tests/test_planning.py
index 1b86c82a2..fa4a7d62b 100644
--- a/backend/tests/test_planning.py
+++ b/backend/tests/test_planning.py
@@ -4,8 +4,8 @@
 state configurations and flags.
 """
 import pytest
-from agent.nodes import planning_mode, planning_router, planning_wait
 
+from agent.nodes import planning_mode, planning_router, planning_wait
 
 # =============================================================================
 # Helper function
diff --git a/backend/tests/test_proxy_security.py b/backend/tests/test_proxy_security.py
index da67a60ff..6d3855f0d 100644
--- a/backend/tests/test_proxy_security.py
+++ b/backend/tests/test_proxy_security.py
@@ -1,9 +1,12 @@
 
+from unittest.mock import AsyncMock, MagicMock
+
 import pytest
-from unittest.mock import MagicMock, AsyncMock
 from starlette.responses import PlainTextResponse
+
 from agent.security import RateLimitMiddleware
 
+
 @pytest.mark.asyncio
 async def test_proxy_security_default_secure():
     """Verify that by default (trust_proxy_headers=False), X-Forwarded-For is ignored."""
diff --git a/backend/tests/test_rag_nodes_mock.py b/backend/tests/test_rag_nodes_mock.py
index 4ac8b3008..a3b708696 100644
--- a/backend/tests/test_rag_nodes_mock.py
+++ b/backend/tests/test_rag_nodes_mock.py
@@ -1,7 +1,10 @@
-import pytest
 from unittest.mock import Mock, patch
+
+import pytest
+
 from agent.rag_nodes import rag_retrieve
 
+
 @pytest.fixture
 def mock_rag_state():
     return {
diff --git a/backend/tests/test_registry.py b/backend/tests/test_registry.py
index ec65d4ad5..3b449e223 100644
--- a/backend/tests/test_registry.py
+++ b/backend/tests/test_registry.py
@@ -10,6 +10,7 @@
 """
 
 import pytest
+
 from agent.registry import GraphRegistry, graph_registry
 
 
diff --git a/backend/tests/test_research_tools.py b/backend/tests/test_research_tools.py
index af24d7c12..b965842db 100644
--- a/backend/tests/test_research_tools.py
+++ b/backend/tests/test_research_tools.py
@@ -2,8 +2,10 @@
 
 Tests cover search functions, summarization, deduplication, and tool definitions.
 """
+from unittest.mock import MagicMock, Mock, patch
+
 import pytest
-from unittest.mock import Mock, patch, MagicMock
+
 from agent.models import GEMINI_FLASH, GEMINI_PRO
 
 
diff --git a/backend/tests/test_search_robustness.py b/backend/tests/test_search_robustness.py
index 4e35f39bf..124341c0a 100644
--- a/backend/tests/test_search_robustness.py
+++ b/backend/tests/test_search_robustness.py
@@ -4,9 +4,16 @@
 These tests ensure that the agent's search tools do not crash when external APIs return
 unexpected structures, empty strings, or partial data.
 """
-import pytest
 from unittest.mock import MagicMock, patch
-from agent.research_tools import deduplicate_search_results, process_search_results, format_search_output
+
+import pytest
+
+from agent.research_tools import (
+    deduplicate_search_results,
+    format_search_output,
+    process_search_results,
+)
+
 
 class TestSearchRobustness:
     
diff --git a/backend/tests/test_search_router.py b/backend/tests/test_search_router.py
index bd199f46a..203c82561 100644
--- a/backend/tests/test_search_router.py
+++ b/backend/tests/test_search_router.py
@@ -5,19 +5,19 @@
 - Routing logic (primary vs fallback).
 - Error handling and fallback mechanisms.
 """
-import pytest
-from unittest.mock import MagicMock, patch
-
 # Import SUT
 import sys
-from unittest.mock import MagicMock
+from unittest.mock import MagicMock, patch
+
+import pytest
 
 # MOCK google.genai BEFORE importing search.router to avoid broken environment dependencies
 # (e.g. pycares/aiohttp issues in current env)
 sys.modules["google.genai"] = MagicMock()
 
-from search.router import SearchRouter, SearchProviderType
 from search.provider import SearchResult
+from search.router import SearchProviderType, SearchRouter
+
 
 class TestSearchRouter:
     """Tests for SearchRouter logic."""
diff --git a/backend/tests/test_state.py b/backend/tests/test_state.py
index 0f19eb48a..e987aed68 100644
--- a/backend/tests/test_state.py
+++ b/backend/tests/test_state.py
@@ -8,20 +8,20 @@
 - State validation and edge cases
 """
 
+from typing import Any, Dict, List
+
 import pytest
-from typing import List, Dict, Any
 
 from agent.state import (
-    create_rag_resources,
     OverallState,
-    ReflectionState,
     Query,
     QueryGenerationState,
-    WebSearchState,
+    ReflectionState,
     SearchStateOutput,
+    WebSearchState,
+    create_rag_resources,
 )
 
-
 # =============================================================================
 # Tests for create_rag_resources Function
 # =============================================================================
diff --git a/backend/tests/test_state_types.py b/backend/tests/test_state_types.py
index 41e3cbab6..d8036994c 100644
--- a/backend/tests/test_state_types.py
+++ b/backend/tests/test_state_types.py
@@ -1,7 +1,10 @@
 import json
+
 import pytest
+
 from agent.state import OverallState, Todo, validate_scoping
 
+
 def test_typing_smoke():
     """Ensure OverallState can be instantiated with new fields."""
     s: OverallState = {
diff --git a/backend/tests/test_supervisor.py b/backend/tests/test_supervisor.py
index 68bc4ddce..1500a852e 100644
--- a/backend/tests/test_supervisor.py
+++ b/backend/tests/test_supervisor.py
@@ -8,21 +8,20 @@
 - Graph compilation and structure
 """
 
-import pytest
-from unittest.mock import patch, MagicMock
-from typing import Dict, Any
-from langchain_core.runnables import RunnableConfig
-
-from agent.state import OverallState
-from agent.graphs.supervisor import compress_context, graph
-
-
 # =============================================================================
 # Fixtures
 # =============================================================================
-
 import dataclasses
+from typing import Any, Dict
+from unittest.mock import MagicMock, patch
+
+import pytest
+from langchain_core.runnables import RunnableConfig
+
 from agent.graphs import supervisor
+from agent.graphs.supervisor import compress_context, graph
+from agent.state import OverallState
+
 
 @pytest.fixture(autouse=True)
 def disable_compression():
diff --git a/backend/tests/test_utils.py b/backend/tests/test_utils.py
index ff3902bf4..e6661c448 100644
--- a/backend/tests/test_utils.py
+++ b/backend/tests/test_utils.py
@@ -3,13 +3,20 @@
 Tests cover edge cases, error handling, and typical usage patterns.
 All tests are designed to be path-insensitive and robust to minor changes.
 """
-import pytest
 from typing import List
 
+import pytest
+from langchain_core.messages import AIMessage, HumanMessage
+
 from tests.helpers import (
-    MockSegment, MockChunk, MockSupport, MockCandidate, MockResponse, MockSite
+    MockCandidate,
+    MockChunk,
+    MockResponse,
+    MockSegment,
+    MockSite,
+    MockSupport,
 )
-from langchain_core.messages import HumanMessage, AIMessage
+
 
 def make_human_message(content):
     return HumanMessage(content=content)
@@ -17,13 +24,12 @@ def make_human_message(content):
 def make_ai_message(content):
     return AIMessage(content=content)
 from agent.utils import (
+    get_citations,
     get_research_topic,
-    resolve_urls,
     insert_citation_markers,
-    get_citations,
+    resolve_urls,
 )
 
-
 # =============================================================================
 # Tests for get_research_topic
 # =============================================================================
@@ -311,6 +317,7 @@ def test_citations_handle_titles_without_dots(self):
 
 from agent.utils import join_and_truncate
 
+
 class TestJoinAndTruncate:
     """Tests for the join_and_truncate function."""
 
@@ -385,6 +392,7 @@ def test_limit_cuts_separator_completely(self):
 
 from agent.utils import has_fuzzy_match
 
+
 class TestHasFuzzyMatch:
     """Tests for the has_fuzzy_match function."""
 
diff --git a/backend/tests/test_utils_hypothesis.py b/backend/tests/test_utils_hypothesis.py
index 65dae94f9..70a10fc73 100644
--- a/backend/tests/test_utils_hypothesis.py
+++ b/backend/tests/test_utils_hypothesis.py
@@ -1,5 +1,7 @@
-from hypothesis import given, strategies as st, settings, HealthCheck
 import pytest
+from hypothesis import HealthCheck, given, settings
+from hypothesis import strategies as st
+
 from agent.utils import insert_citation_markers
 
 # Mark these tests as extended because they are slow property-based tests
diff --git a/backend/tests/test_validate_web_results.py b/backend/tests/test_validate_web_results.py
index 95149d285..2cc5736b8 100644
--- a/backend/tests/test_validate_web_results.py
+++ b/backend/tests/test_validate_web_results.py
@@ -2,8 +2,9 @@
 
 Tests cover filtering logic, edge cases, and fallback behavior.
 """
+from unittest.mock import MagicMock, patch
+
 import pytest
-from unittest.mock import patch, MagicMock
 from langchain_core.runnables import RunnableConfig
 
 from agent.nodes import validate_web_results
diff --git a/backend/tests/test_validation.py b/backend/tests/test_validation.py
index d9394ac22..3b9fb4624 100644
--- a/backend/tests/test_validation.py
+++ b/backend/tests/test_validation.py
@@ -1,8 +1,11 @@
+import logging
 import os
+from unittest.mock import MagicMock, patch
+
 import pytest
-import logging
-from unittest.mock import patch, MagicMock
-from config.validation import validate_environment, check_env_strict
+
+from config.validation import check_env_strict, validate_environment
+
 
 class TestValidation:
 
diff --git a/backend/tests/test_validation_coverage.py b/backend/tests/test_validation_coverage.py
index 0371b75d0..c45b04006 100644
--- a/backend/tests/test_validation_coverage.py
+++ b/backend/tests/test_validation_coverage.py
@@ -1,9 +1,12 @@
-import os
-import logging
 import importlib.util
-from unittest.mock import patch, MagicMock
+import logging
+import os
+from unittest.mock import MagicMock, patch
+
 import pytest
-from config.validation import validate_environment, check_env_strict
+
+from config.validation import check_env_strict, validate_environment
+
 
 class TestValidation:
     @pytest.fixture
diff --git a/scripts/dev.py b/scripts/dev.py
index e035f5ecb..a8cd6fb4c 100644
--- a/scripts/dev.py
+++ b/scripts/dev.py
@@ -14,7 +14,7 @@ def main():
     frontend_dir = os.path.join(root_dir, "frontend")
     backend_dir = os.path.join(root_dir, "backend")
 
-    print(f"🚀 Starting development servers...")
+    print("🚀 Starting development servers...")
 
     # Define commands based on OS
     is_windows = sys.platform.startswith('win')
diff --git a/scripts/generate_sample_reports.py b/scripts/generate_sample_reports.py
index ef3a0f7a0..a2b96e4f4 100644
--- a/scripts/generate_sample_reports.py
+++ b/scripts/generate_sample_reports.py
@@ -113,7 +113,7 @@ async def generate_report(run_config):
         final_state = await graph.ainvoke(inputs, runnable_config)
 
         # Extract Final Answer
-        if "messages" in final_state and final_state["messages"]:
+        if final_state.get("messages"):
             last_msg = final_state["messages"][-1]
             report_content = last_msg.content
         else:
@@ -130,7 +130,7 @@ async def generate_report(run_config):
 
     except Exception as e:
         print(f"Error generating report for {name}: {e}")
-        report_content = f"Error generating report: {str(e)}"
+        report_content = f"Error generating report: {e!s}"
         import traceback
         traceback.print_exc()