diff --git a/client/src/api/adapters/mock/index.test.ts b/client/src/api/adapters/mock/index.test.ts
index 3c94e7a..b856ed4 100644
--- a/client/src/api/adapters/mock/index.test.ts
+++ b/client/src/api/adapters/mock/index.test.ts
@@ -1,6 +1,25 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 import type { NoteFlowAPI } from '@/api/interface';
-import type { FinalSegment } from '@/api/types';
+import type {
+  FinalSegment,
+  UpdateWorkspaceSettingsRequest,
+  CreateProjectRequest,
+  AddProjectMemberRequest,
+  UpdateProjectMemberRoleRequest,
+  RemoveProjectMemberRequest,
+  CreateSummarizationTemplateRequest,
+  UpdateSummarizationTemplateRequest,
+  ArchiveSummarizationTemplateRequest,
+  RestoreSummarizationTemplateVersionRequest,
+  RegisterOidcProviderRequest,
+  UpdateOidcProviderRequest,
+  GetOAuthClientConfigRequest,
+  SetOAuthClientConfigRequest,
+  UpdateTaskRequest,
+  UpdateASRConfigurationRequest,
+  UpdateStreamingConfigurationRequest,
+  SetHuggingFaceTokenRequest,
+} from '@/api/types';
 
 async function loadMockAPI(): Promise<NoteFlowAPI> {
   vi.resetModules();
@@ -12,6 +31,11 @@ async function flushTimers() {
   await vi.runAllTimersAsync();
 }
 
+async function run<T>(promise: Promise<T>): Promise<T> {
+  await flushTimers();
+  return promise;
+}
+
 describe('mockAPI', () => {
   beforeEach(() => {
     vi.useFakeTimers();
@@ -528,4 +552,387 @@ describe('mockAPI', () => {
     await flushTimers();
     await metricsDefaultPromise;
   });
+
+  it('merges workspace settings and manages active projects', async () => {
+    const mockAPI = await loadMockAPI();
+
+    const workspaceList = await run(mockAPI.listWorkspaces());
+    const primaryWorkspace = workspaceList.workspaces[0];
+    const secondaryWorkspace = workspaceList.workspaces[1];
+    if (!primaryWorkspace || !secondaryWorkspace) {
+      throw new Error('Expected default workspaces');
+    }
+
+    const settings = await run(
+      mockAPI.getWorkspaceSettings({ workspace_id: primaryWorkspace.id })
+    );
+    expect(settings.export_rules).toBeUndefined();
+
+    const updateRequest: UpdateWorkspaceSettingsRequest = {
+      workspace_id: primaryWorkspace.id,
+      settings: {
+        export_rules: { default_format: 'markdown', include_audio: true },
+        trigger_rules: { auto_start_enabled: true },
+        rag_enabled: true,
+      },
+    };
+    const updated = await run(mockAPI.updateWorkspaceSettings(updateRequest));
+    expect(updated.export_rules?.default_format).toBe('markdown');
+    expect(updated.trigger_rules?.auto_start_enabled).toBe(true);
+    expect(updated.rag_enabled).toBe(true);
+
+    const mergeRequest: UpdateWorkspaceSettingsRequest = {
+      workspace_id: primaryWorkspace.id,
+      settings: {
+        export_rules: { include_timestamps: true },
+        default_summarization_template: 'template-1',
+      },
+    };
+    const merged = await run(mockAPI.updateWorkspaceSettings(mergeRequest));
+    expect(merged.export_rules?.default_format).toBe('markdown');
+    expect(merged.export_rules?.include_timestamps).toBe(true);
+    expect(merged.default_summarization_template).toBe('template-1');
+
+    const createProjectRequest: CreateProjectRequest = {
+      workspace_id: primaryWorkspace.id,
+      name: ' New Project !! ',
+      description: 'Testing',
+    };
+    const project = await run(mockAPI.createProject(createProjectRequest));
+    expect(project.slug).toBe('new-project');
+
+    await run(
+      mockAPI.setActiveProject({ workspace_id: primaryWorkspace.id, project_id: project.id })
+    );
+    const active = await run(mockAPI.getActiveProject({ workspace_id: primaryWorkspace.id }));
+    expect(active.project_id).toBe(project.id);
+
+    const missingActive = mockAPI.setActiveProject({
+      workspace_id: primaryWorkspace.id,
+      project_id: 'missing-project',
+    });
+    await flushTimers();
+    await expect(missingActive).rejects.toThrow('Project not found');
+
+    const wrongWorkspace = mockAPI.setActiveProject({
+      workspace_id: secondaryWorkspace.id,
+      project_id: project.id,
+    });
+    await flushTimers();
+    await expect(wrongWorkspace).rejects.toThrow('Project does not belong to workspace');
+
+    const projects = await run(
+      mockAPI.listProjects({ workspace_id: primaryWorkspace.id, include_archived: true })
+    );
+    const defaultProject = projects.projects.find((item) => item.is_default);
+    if (!defaultProject) {
+      throw new Error('Expected default project');
+    }
+    const archiveDefault = mockAPI.archiveProject(defaultProject.id);
+    await flushTimers();
+    await expect(archiveDefault).rejects.toThrow('Cannot archive default project');
+  });
+
+  it('manages project members and roles', async () => {
+    const mockAPI = await loadMockAPI();
+    const workspaceList = await run(mockAPI.listWorkspaces());
+    const workspace = workspaceList.workspaces[0];
+    if (!workspace) {
+      throw new Error('Expected workspace');
+    }
+
+    const project = await run(
+      mockAPI.createProject({ workspace_id: workspace.id, name: 'Members' })
+    );
+
+    const addRequest: AddProjectMemberRequest = {
+      project_id: project.id,
+      user_id: 'user-2',
+      role: 'editor',
+    };
+    const added = await run(mockAPI.addProjectMember(addRequest));
+    expect(added.user_id).toBe('user-2');
+
+    const membersPage = await run(
+      mockAPI.listProjectMembers({ project_id: project.id, limit: 1, offset: 0 })
+    );
+    expect(membersPage.total_count).toBeGreaterThan(0);
+
+    const updateRoleRequest: UpdateProjectMemberRoleRequest = {
+      project_id: project.id,
+      user_id: 'user-2',
+      role: 'admin',
+    };
+    const updated = await run(mockAPI.updateProjectMemberRole(updateRoleRequest));
+    expect(updated.role).toBe('admin');
+
+    const missingUpdate = mockAPI.updateProjectMemberRole({
+      project_id: project.id,
+      user_id: 'missing',
+      role: 'viewer',
+    });
+    await flushTimers();
+    await expect(missingUpdate).rejects.toThrow('Membership not found');
+
+    const removeRequest: RemoveProjectMemberRequest = {
+      project_id: project.id,
+      user_id: 'user-2',
+    };
+    const removed = await run(mockAPI.removeProjectMember(removeRequest));
+    expect(removed.success).toBe(true);
+
+    const removedAgain = await run(mockAPI.removeProjectMember(removeRequest));
+    expect(removedAgain.success).toBe(false);
+  });
+
+  it('manages summarization templates and versions', async () => {
+    const mockAPI = await loadMockAPI();
+    const workspaceList = await run(mockAPI.listWorkspaces());
+    const workspace = workspaceList.workspaces[0];
+    if (!workspace) {
+      throw new Error('Expected workspace');
+    }
+
+    const templates = await run(
+      mockAPI.listSummarizationTemplates({ workspace_id: workspace.id, include_system: true })
+    );
+    const systemTemplate = templates.templates.find((item) => item.is_system);
+    if (!systemTemplate) {
+      throw new Error('Expected system template');
+    }
+
+    const createRequest: CreateSummarizationTemplateRequest = {
+      workspace_id: workspace.id,
+      name: ' Custom Template ',
+      description: ' Description ',
+      content: 'Hello {{meeting.title}}',
+      change_note: ' Initial ',
+    };
+    const created = await run(mockAPI.createSummarizationTemplate(createRequest));
+    expect(created.template.name).toBe('Custom Template');
+    expect(created.version.version_number).toBe(1);
+
+    const fullTemplate = await run(
+      mockAPI.getSummarizationTemplate({
+        template_id: created.template.id,
+        include_current_version: true,
+      })
+    );
+    expect(fullTemplate.current_version?.id).toBe(created.version.id);
+
+    const withoutVersion = await run(
+      mockAPI.getSummarizationTemplate({
+        template_id: created.template.id,
+        include_current_version: false,
+      })
+    );
+    expect(withoutVersion.current_version).toBeUndefined();
+
+    const updateRequest: UpdateSummarizationTemplateRequest = {
+      template_id: created.template.id,
+      name: ' Updated ',
+      content: 'Updated content',
+      change_note: ' Revised ',
+    };
+    const updated = await run(mockAPI.updateSummarizationTemplate(updateRequest));
+    expect(updated.template.name).toBe('Updated');
+    expect(updated.version?.version_number).toBe(2);
+
+    const versions = await run(
+      mockAPI.listSummarizationTemplateVersions({ template_id: created.template.id })
+    );
+    expect(versions.total_count).toBe(2);
+
+    const restoreRequest: RestoreSummarizationTemplateVersionRequest = {
+      template_id: created.template.id,
+      version_id: created.version.id,
+    };
+    const restored = await run(mockAPI.restoreSummarizationTemplateVersion(restoreRequest));
+    expect(restored.current_version_id).toBe(created.version.id);
+
+    const archiveRequest: ArchiveSummarizationTemplateRequest = {
+      template_id: created.template.id,
+    };
+    const archived = await run(mockAPI.archiveSummarizationTemplate(archiveRequest));
+    expect(archived.is_archived).toBe(true);
+
+    const activeList = await run(
+      mockAPI.listSummarizationTemplates({ workspace_id: workspace.id, include_archived: false })
+    );
+    expect(activeList.templates.some((item) => item.id === created.template.id)).toBe(false);
+
+    const archivedList = await run(
+      mockAPI.listSummarizationTemplates({ workspace_id: workspace.id, include_archived: true })
+    );
+    expect(archivedList.templates.some((item) => item.id === created.template.id)).toBe(true);
+
+    const updateSystem = mockAPI.updateSummarizationTemplate({
+      template_id: systemTemplate.id,
+      name: 'Nope',
+    });
+    await flushTimers();
+    await expect(updateSystem).rejects.toThrow('System templates are read-only');
+
+    const archiveSystem = mockAPI.archiveSummarizationTemplate({
+      template_id: systemTemplate.id,
+    });
+    await flushTimers();
+    await expect(archiveSystem).rejects.toThrow('System templates are read-only');
+
+    const systemVersions = await run(
+      mockAPI.listSummarizationTemplateVersions({ template_id: systemTemplate.id })
+    );
+    const restoreSystem = mockAPI.restoreSummarizationTemplateVersion({
+      template_id: systemTemplate.id,
+      version_id: systemVersions.versions[0]?.id ?? 'missing',
+    });
+    await flushTimers();
+    await expect(restoreSystem).rejects.toThrow('System templates are read-only');
+  });
+
+  it('handles auth, calendar, oidc, and config flows', async () => {
+    const mockAPI = await loadMockAPI();
+
+    const auth = await run(mockAPI.initiateAuthLogin('google'));
+    expect(auth.auth_url).toContain('http');
+
+    const completed = await run(mockAPI.completeAuthLogin('google', 'code', 'state'));
+    expect(completed.display_name).toBe('Google User');
+
+    const logout = await run(mockAPI.logout());
+    expect(logout.tokens_revoked).toBe(true);
+
+    const providers = await run(mockAPI.getCalendarProviders());
+    expect(providers.providers.length).toBeGreaterThan(0);
+
+    const calendarAuth = await run(mockAPI.initiateCalendarAuth('google'));
+    expect(calendarAuth.auth_url).toContain('http');
+
+    const calendarComplete = await run(mockAPI.completeCalendarAuth('google', 'code', 'state'));
+    expect(calendarComplete.success).toBe(true);
+
+    const oauthStatus = await run(mockAPI.getOAuthConnectionStatus('google'));
+    expect(oauthStatus.connection.provider).toBe('google');
+
+    const oauthConfigRequest: GetOAuthClientConfigRequest = { provider: 'google' };
+    const oauthConfig = await run(mockAPI.getOAuthClientConfig(oauthConfigRequest));
+    expect(oauthConfig.config.override_enabled).toBe(false);
+
+    const setConfigRequest: SetOAuthClientConfigRequest = {
+      provider: 'google',
+      config: {
+        client_id: 'id',
+        redirect_uri: 'http://localhost',
+        scopes: ['openid'],
+        override_enabled: true,
+      },
+    };
+    const setConfig = await run(mockAPI.setOAuthClientConfig(setConfigRequest));
+    expect(setConfig.success).toBe(true);
+
+    const diagnostics = await run(mockAPI.runConnectionDiagnostics());
+    expect(diagnostics.clientConnected).toBe(false);
+
+    const listEvents = await run(mockAPI.listCalendarEvents());
+    expect(listEvents.events).toHaveLength(0);
+
+    const oidcRegister: RegisterOidcProviderRequest = {
+      workspace_id: 'workspace-1',
+      name: 'Provider',
+      issuer_url: 'https://issuer',
+      client_id: 'client',
+      preset: 'custom',
+      scopes: [],
+      allowed_groups: [],
+      auto_discover: true,
+    };
+    const oidcProvider = await run(mockAPI.registerOidcProvider(oidcRegister));
+    expect(oidcProvider.discovery).toBeDefined();
+
+    const listProviders = await run(mockAPI.listOidcProviders(undefined, true));
+    expect(listProviders.total_count).toBeGreaterThan(0);
+
+    const getProvider = await run(mockAPI.getOidcProvider(oidcProvider.id));
+    expect(getProvider.id).toBe(oidcProvider.id);
+
+    const updateRequest: UpdateOidcProviderRequest = {
+      provider_id: oidcProvider.id,
+      scopes: [],
+      allowed_groups: ['admins'],
+      enabled: false,
+    };
+    const updated = await run(mockAPI.updateOidcProvider(updateRequest));
+    expect(updated.enabled).toBe(false);
+
+    const refreshed = await run(mockAPI.refreshOidcDiscovery(oidcProvider.id));
+    expect(refreshed.success_count).toBe(1);
+
+    const refreshMissing = await run(mockAPI.refreshOidcDiscovery('missing'));
+    expect(refreshMissing.failure_count).toBe(1);
+
+    const presets = await run(mockAPI.listOidcPresets());
+    expect(presets.presets.length).toBeGreaterThan(0);
+
+    const deleted = await run(mockAPI.deleteOidcProvider(oidcProvider.id));
+    expect(deleted.success).toBe(true);
+  });
+
+  it('handles ASR, streaming, token, tasks, and analytics flows', async () => {
+    const mockAPI = await loadMockAPI();
+
+    const asrConfig = await run(mockAPI.getAsrConfiguration());
+    expect(asrConfig.availableModelSizes.length).toBeGreaterThan(0);
+
+    const updateAsrRequest: UpdateASRConfigurationRequest = {
+      modelSize: 'base',
+      device: 'cpu',
+      computeType: 'int8',
+    };
+    const asrUpdate = await run(mockAPI.updateAsrConfiguration(updateAsrRequest));
+    expect(asrUpdate.accepted).toBe(true);
+
+    const asrStatus = await run(mockAPI.getAsrJobStatus(asrUpdate.jobId));
+    expect(asrStatus.status).toBe('completed');
+
+    const streaming = await run(mockAPI.getStreamingConfiguration());
+    expect(streaming.maxSegmentDurationSeconds).toBeGreaterThan(0);
+
+    const updateStreamingRequest: UpdateStreamingConfigurationRequest = {
+      partialCadenceSeconds: 1.5,
+    };
+    const updatedStreaming = await run(
+      mockAPI.updateStreamingConfiguration(updateStreamingRequest)
+    );
+    expect(updatedStreaming.partialCadenceSeconds).toBe(2.0);
+
+    const tokenRequest: SetHuggingFaceTokenRequest = { token: 'hf_token', validate: true };
+    const tokenResult = await run(mockAPI.setHuggingFaceToken(tokenRequest));
+    expect(tokenResult.success).toBe(true);
+
+    const tokenStatus = await run(mockAPI.getHuggingFaceTokenStatus());
+    expect(tokenStatus.isConfigured).toBe(false);
+
+    const tokenValidation = await run(mockAPI.validateHuggingFaceToken());
+    expect(tokenValidation.valid).toBe(false);
+
+    const tasks = await run(mockAPI.listTasks());
+    expect(tasks.total_count).toBe(0);
+
+    const updateTaskRequest: UpdateTaskRequest = {
+      task_id: 'task-1',
+      text: 'Follow up',
+      status: 'done',
+    };
+    const updatedTask = await run(mockAPI.updateTask(updateTaskRequest));
+    expect(updatedTask.status).toBe('done');
+
+    const overview = await run(mockAPI.getAnalyticsOverview());
+    expect(overview.total_meetings).toBe(0);
+
+    const speakerStats = await run(mockAPI.listSpeakerStats());
+    expect(speakerStats.speakers).toHaveLength(0);
+
+    const entityAnalytics = await run(mockAPI.getEntityAnalytics());
+    expect(entityAnalytics.total_entities).toBe(0);
+  });
 });
diff --git a/pyproject.toml b/pyproject.toml
index b2ddde6..25d37b0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,6 +34,10 @@ dependencies = [
     "sounddevice>=0.5.3",
     "spacy>=3.8.11",
     "openai-whisper>=20250625",
+    "langgraph>=1.0.6",
+    "langgraph-checkpoint-postgres>=3.0.3",
+    "langgraph-checkpoint-redis>=0.3.2",
+    "psycopg>=3.3.2",
 ]
 
 [project.optional-dependencies]
diff --git a/src/noteflow/application/services/asr_config/persistence.py b/src/noteflow/application/services/asr_config/persistence.py
index 4c38d26..f97e4ab 100644
--- a/src/noteflow/application/services/asr_config/persistence.py
+++ b/src/noteflow/application/services/asr_config/persistence.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+from collections.abc import Callable
 from dataclasses import dataclass
 from typing import Final, Protocol, TypedDict, cast
 
@@ -34,7 +35,7 @@ class AsrPreferenceResolution:
 
 
 class _TorchCudaModule(Protocol):
-    def is_available(self) -> bool: ...
+    is_available: Callable[[], bool]
 
 
 class _TorchModule(Protocol):
diff --git a/src/noteflow/domain/ai/interrupts.py b/src/noteflow/domain/ai/interrupts.py
index 0ee6985..bb9dc10 100644
--- a/src/noteflow/domain/ai/interrupts.py
+++ b/src/noteflow/domain/ai/interrupts.py
@@ -12,6 +12,8 @@ from dataclasses import dataclass, field
 from enum import StrEnum
 from typing import Final
 
+from noteflow.domain.constants.fields import ACTION, CONFIG, COUNT
+
 
 class InterruptType(StrEnum):
     """Types of human-in-the-loop interrupts."""
@@ -29,9 +31,19 @@ class InterruptAction(StrEnum):
     MODIFY = "modify"
 
 
-DEFAULT_WEB_SEARCH_OPTIONS: Final[tuple[str, ...]] = ("approve", "reject")
-DEFAULT_ANNOTATION_OPTIONS: Final[tuple[str, ...]] = ("approve", "reject", "modify")
-DEFAULT_SENSITIVE_OPTIONS: Final[tuple[str, ...]] = ("approve", "reject")
+DEFAULT_WEB_SEARCH_OPTIONS: Final[tuple[str, ...]] = (
+    InterruptAction.APPROVE.value,
+    InterruptAction.REJECT.value,
+)
+DEFAULT_ANNOTATION_OPTIONS: Final[tuple[str, ...]] = (
+    InterruptAction.APPROVE.value,
+    InterruptAction.REJECT.value,
+    InterruptAction.MODIFY.value,
+)
+DEFAULT_SENSITIVE_OPTIONS: Final[tuple[str, ...]] = (
+    InterruptAction.APPROVE.value,
+    InterruptAction.REJECT.value,
+)
 
 
 @dataclass(frozen=True)
@@ -61,18 +73,18 @@ class InterruptRequest:
     interrupt_type: InterruptType
     message: str
     context: dict[str, object] = field(default_factory=dict)
-    options: tuple[str, ...] = field(default_factory=lambda: ("approve", "reject"))
+    options: tuple[str, ...] = field(default_factory=lambda: DEFAULT_WEB_SEARCH_OPTIONS)
     config: InterruptConfig = field(default_factory=InterruptConfig)
     request_id: str = ""
 
-    def to_dict(self) -> dict[str, object]:
+    def to_request_payload(self) -> dict[str, object]:
         """Convert to dictionary for serialization."""
         return {
             "interrupt_type": self.interrupt_type,
             "message": self.message,
             "context": self.context,
             "options": list(self.options),
-            "config": {
+            CONFIG: {
                 "allow_ignore": self.config.allow_ignore,
                 "allow_modify": self.config.allow_modify,
                 "timeout_seconds": self.config.timeout_seconds,
@@ -114,10 +126,10 @@ class InterruptResponse:
         """Check if the action was modified."""
         return self.action == InterruptAction.MODIFY
 
-    def to_dict(self) -> dict[str, object]:
+    def to_response_payload(self) -> dict[str, object]:
         """Convert to dictionary for serialization."""
         result: dict[str, object] = {
-            "action": self.action,
+            ACTION: self.action,
             "request_id": self.request_id,
         }
         if self.modified_value is not None:
@@ -143,11 +155,13 @@ def create_web_search_interrupt(
     Returns:
         InterruptRequest configured for web search approval.
     """
+    options = DEFAULT_ANNOTATION_OPTIONS if allow_modify else DEFAULT_WEB_SEARCH_OPTIONS
+    message = _build_web_search_message(query)
     return InterruptRequest(
         interrupt_type=InterruptType.WEB_SEARCH_APPROVAL,
-        message=f"Allow web search for additional context? Query: {query[:100]}",
+        message=message,
         context={"query": query},
-        options=("approve", "reject", "modify") if allow_modify else DEFAULT_WEB_SEARCH_OPTIONS,
+        options=options,
         config=InterruptConfig(allow_modify=allow_modify),
         request_id=request_id,
     )
@@ -170,7 +184,7 @@ def create_annotation_interrupt(
     return InterruptRequest(
         interrupt_type=InterruptType.ANNOTATION_APPROVAL,
         message=f"Apply {count} suggested annotation(s)?",
-        context={"annotations": annotations, "count": count},
+        context={"annotations": annotations, COUNT: count},
         options=DEFAULT_ANNOTATION_OPTIONS,
         config=InterruptConfig(allow_modify=True, allow_ignore=True),
         request_id=request_id,
@@ -192,11 +206,20 @@ def create_sensitive_action_interrupt(
     Returns:
         InterruptRequest configured for sensitive action confirmation.
     """
+    message = _build_sensitive_action_message(action_name)
     return InterruptRequest(
         interrupt_type=InterruptType.SENSITIVE_ACTION,
-        message=f"Confirm action: {action_name}",
+        message=message,
         context={"action_name": action_name, "description": action_description},
         options=DEFAULT_SENSITIVE_OPTIONS,
         config=InterruptConfig(allow_ignore=False),
         request_id=request_id,
     )
+
+
+def _build_web_search_message(query: str) -> str:
+    return f"Allow web search for additional context? Query: {query[:100]}"
+
+
+def _build_sensitive_action_message(action_name: str) -> str:
+    return f"Confirm action: {action_name}"
diff --git a/src/noteflow/domain/ai/ports.py b/src/noteflow/domain/ai/ports.py
index c49749f..25280aa 100644
--- a/src/noteflow/domain/ai/ports.py
+++ b/src/noteflow/domain/ai/ports.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+from dataclasses import dataclass
 from typing import TYPE_CHECKING, Protocol
 
 if TYPE_CHECKING:
@@ -13,14 +14,16 @@ if TYPE_CHECKING:
 class AssistantPort(Protocol):
     """Protocol for AI assistant operations."""
 
-    async def ask(
-        self,
-        question: str,
-        user_id: UUID,
-        meeting_id: UUID | None = None,
-        thread_id: str | None = None,
-        allow_web: bool = False,
-        top_k: int = 8,
-    ) -> AssistantOutputState:
+    async def ask(self, request: AssistantRequest) -> AssistantOutputState:
         """Ask a question about meeting transcript(s)."""
         ...
+
+
+@dataclass(frozen=True)
+class AssistantRequest:
+    question: str
+    user_id: UUID
+    meeting_id: UUID | None = None
+    thread_id: str | None = None
+    allow_web: bool = False
+    top_k: int = 8
diff --git a/src/noteflow/domain/constants/fields.py b/src/noteflow/domain/constants/fields.py
index 7f99a49..299be11 100644
--- a/src/noteflow/domain/constants/fields.py
+++ b/src/noteflow/domain/constants/fields.py
@@ -24,6 +24,9 @@ UPDATED_AT: Final[Literal["updated_at"]] = "updated_at"
 PROJECT_ID: Final[str] = "project_id"
 PROJECT_IDS: Final[str] = "project_ids"
 OPTIONS: Final[str] = "options"
+ACTION: Final[Literal["action"]] = "action"
+COUNT: Final[Literal["count"]] = "count"
+CONFIG: Final[Literal["config"]] = "config"
 CALENDAR: Final[str] = "calendar"
 CLAIM_MAPPING: Final[str] = "claim_mapping"
 REQUIRE_EMAIL_VERIFIED: Final[str] = "require_email_verified"
diff --git a/src/noteflow/grpc/mixins/calendar_oauth_config.py b/src/noteflow/grpc/mixins/calendar_oauth_config.py
index bfdce1e..ae14237 100644
--- a/src/noteflow/grpc/mixins/calendar_oauth_config.py
+++ b/src/noteflow/grpc/mixins/calendar_oauth_config.py
@@ -7,7 +7,7 @@ from uuid import UUID
 
 from noteflow.application.services.calendar import CalendarServiceError
 from noteflow.config.constants.errors import ERROR_WORKSPACE_ADMIN_REQUIRED
-from noteflow.domain.constants.fields import ENTITY_WORKSPACE
+from noteflow.domain.constants.fields import CONFIG, ENTITY_WORKSPACE
 from noteflow.domain.value_objects import OAuthClientConfig
 
 from ..proto import noteflow_pb2
@@ -115,7 +115,7 @@ class CalendarOAuthConfigMixin:
         if not request.provider:
             await abort_invalid_argument(context, "Provider is required")
             raise AssertionError(UNREACHABLE_ERROR) from None
-        if not request.HasField("config"):
+        if not request.HasField(CONFIG):
             await abort_invalid_argument(context, "OAuth config is required")
             raise AssertionError(UNREACHABLE_ERROR) from None
 
diff --git a/src/noteflow/infrastructure/ai/_langgraph_compat.py b/src/noteflow/infrastructure/ai/_langgraph_compat.py
new file mode 100644
index 0000000..eb21f5e
--- /dev/null
+++ b/src/noteflow/infrastructure/ai/_langgraph_compat.py
@@ -0,0 +1,56 @@
+"""LangGraph compatibility layer for basedpyright strict mode.
+
+This module provides typed wrappers for LangGraph types that have incomplete
+or incorrect type annotations. All pyright: ignore comments are isolated here
+to keep the rest of the codebase clean.
+
+The LangGraph Command class is a frozen dataclass with Generic[N] inheritance
+that basedpyright misinterprets as requiring a 'value' parameter. This module
+wraps Command construction to provide proper typing.
+
+Issue: basedpyright reports "Argument missing for parameter 'value'" on
+Command() calls even though Command has no 'value' parameter. This appears
+to be a basedpyright issue with Generic dataclasses.
+
+Usage:
+    from noteflow.infrastructure.ai._langgraph_compat import create_command
+"""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any, cast
+
+from langgraph.types import Command
+
+if TYPE_CHECKING:
+    pass
+
+
+def create_command(
+    *,
+    graph: str | None = None,
+    update: Any | None = None,
+    resume: dict[str, Any] | Any | None = None,
+) -> Command[Any]:
+    """Create a LangGraph Command with proper typing.
+
+    This wrapper isolates the pyright: ignore needed for Command construction
+    due to basedpyright's incorrect handling of Generic dataclasses.
+
+    Args:
+        graph: Graph to send the command to (None = current graph).
+        update: Update to apply to the graph's state.
+        resume: Value to resume execution with (for interrupt handling).
+
+    Returns:
+        A properly typed Command instance.
+    """
+    command = cast(
+        Command[Any],
+        Command(  # pyright: ignore[reportCallIssue]
+            graph=graph,
+            update=update,
+            resume=resume,
+        ),
+    )
+    return command
diff --git a/src/noteflow/infrastructure/ai/cache.py b/src/noteflow/infrastructure/ai/cache.py
index 6476262..4693522 100644
--- a/src/noteflow/infrastructure/ai/cache.py
+++ b/src/noteflow/infrastructure/ai/cache.py
@@ -28,7 +28,7 @@ class CacheEntry:
     embedding: tuple[float, ...]
     created_at: float
 
-    def is_expired(self, ttl_seconds: float, current_time: float) -> bool:
+    def is_cache_expired(self, ttl_seconds: float, current_time: float) -> bool:
         """Check if entry has expired based on TTL."""
         return (current_time - self.created_at) > ttl_seconds
 
@@ -72,62 +72,23 @@ class EmbeddingCache:
         key = self._compute_key(text)
         current_time = time.monotonic()
 
-        existing_future: asyncio.Future[list[float]] | None = None
+        cached = await self._get_cached_embedding(key, current_time, count_hit=True)
+        if cached is not None:
+            return cached
 
-        async with self._lock:
-            if key in self._cache:
-                entry = self._cache[key]
-                if not entry.is_expired(self.ttl_seconds, current_time):
-                    self._cache.move_to_end(key)
-                    self._stats.hits += 1
-                    logger.debug("cache_hit", key=key[:16])
-                    return list(entry.embedding)
-                del self._cache[key]
-                self._stats.expirations += 1
-                logger.debug("cache_expired", key=key[:16])
-
-            if key in self._in_flight:
-                logger.debug("cache_in_flight_join", key=key[:16])
-                existing_future = self._in_flight[key]
-
-        if existing_future is not None:
-            return list(await existing_future)
-
-        new_future: asyncio.Future[list[float]] = asyncio.get_running_loop().create_future()
-
-        async with self._lock:
-            if key in self._in_flight:
-                existing_future = self._in_flight[key]
-            else:
-                self._stats.misses += 1
-                self._in_flight[key] = new_future
-
-        if existing_future is not None:
-            return list(await existing_future)
+        future, is_new = await self._get_or_register_in_flight(key)
+        if not is_new:
+            return list(await future)
 
         try:
             embedding = await embedder.embed(text)
         except Exception:
-            async with self._lock:
-                _ = self._in_flight.pop(key, None)
-            new_future.set_exception(asyncio.CancelledError())
+            await self._clear_in_flight(key)
+            future.set_exception(asyncio.CancelledError())
             raise
 
-        async with self._lock:
-            _ = self._in_flight.pop(key, None)
-
-            while len(self._cache) >= self.max_size:
-                evicted_key, _ = self._cache.popitem(last=False)
-                self._stats.evictions += 1
-                logger.debug("cache_eviction", evicted_key=evicted_key[:16])
-
-            self._cache[key] = CacheEntry(
-                embedding=tuple(embedding),
-                created_at=current_time,
-            )
-            logger.debug("cache_store", key=key[:16])
-
-        new_future.set_result(embedding)
+        await self._store_embedding(key, embedding, current_time)
+        future.set_result(embedding)
         return embedding
 
     async def get(self, text: str) -> list[float] | None:
@@ -141,18 +102,7 @@ class EmbeddingCache:
         """
         key = self._compute_key(text)
         current_time = time.monotonic()
-
-        async with self._lock:
-            if key in self._cache:
-                entry = self._cache[key]
-                if not entry.is_expired(self.ttl_seconds, current_time):
-                    self._cache.move_to_end(key)
-                    return list(entry.embedding)
-                else:
-                    del self._cache[key]
-                    self._stats.expirations += 1
-
-        return None
+        return await self._get_cached_embedding(key, current_time, count_hit=False)
 
     async def clear(self) -> int:
         """Clear all cached entries.
@@ -171,15 +121,75 @@ class EmbeddingCache:
         async with self._lock:
             return len(self._cache)
 
-    def get_stats(self) -> EmbeddingCacheStats:
+    def stats_snapshot(self) -> EmbeddingCacheStats:
         """Get cache statistics (not async - reads are atomic)."""
+        stats = self._stats
         return EmbeddingCacheStats(
-            hits=self._stats.hits,
-            misses=self._stats.misses,
-            evictions=self._stats.evictions,
-            expirations=self._stats.expirations,
+            hits=stats.hits,
+            misses=stats.misses,
+            evictions=stats.evictions,
+            expirations=stats.expirations,
         )
 
+    async def _get_cached_embedding(
+        self,
+        key: str,
+        current_time: float,
+        *,
+        count_hit: bool,
+    ) -> list[float] | None:
+        async with self._lock:
+            entry = self._cache.get(key)
+            if entry is None:
+                return None
+            if entry.is_cache_expired(self.ttl_seconds, current_time):
+                del self._cache[key]
+                self._stats.expirations += 1
+                logger.debug("cache_expired", key=key[:16])
+                return None
+            self._cache.move_to_end(key)
+            if count_hit:
+                self._stats.hits += 1
+                logger.debug("cache_hit", key=key[:16])
+            return list(entry.embedding)
+
+    async def _get_or_register_in_flight(
+        self,
+        key: str,
+    ) -> tuple[asyncio.Future[list[float]], bool]:
+        async with self._lock:
+            if key in self._in_flight:
+                logger.debug("cache_in_flight_join", key=key[:16])
+                return self._in_flight[key], False
+            future: asyncio.Future[list[float]] = asyncio.get_running_loop().create_future()
+            self._stats.misses += 1
+            self._in_flight[key] = future
+            return future, True
+
+    async def _clear_in_flight(self, key: str) -> None:
+        async with self._lock:
+            _ = self._in_flight.pop(key, None)
+
+    async def _store_embedding(
+        self,
+        key: str,
+        embedding: list[float],
+        current_time: float,
+    ) -> None:
+        async with self._lock:
+            _ = self._in_flight.pop(key, None)
+
+            while len(self._cache) >= self.max_size:
+                evicted_key, _ = self._cache.popitem(last=False)
+                self._stats.evictions += 1
+                logger.debug("cache_eviction", evicted_key=evicted_key[:16])
+
+            self._cache[key] = CacheEntry(
+                embedding=tuple(embedding),
+                created_at=current_time,
+            )
+            logger.debug("cache_store", key=key[:16])
+
 
 class CachedEmbedder:
     """Wrapper that adds caching to any EmbedderProtocol implementation.
diff --git a/src/noteflow/infrastructure/ai/constants.py b/src/noteflow/infrastructure/ai/constants.py
new file mode 100644
index 0000000..76b07f6
--- /dev/null
+++ b/src/noteflow/infrastructure/ai/constants.py
@@ -0,0 +1,23 @@
+"""Shared constants for AI graph state keys and node names."""
+
+from __future__ import annotations
+
+from typing import Final
+
+# Graph node names
+NODE_RETRIEVE: Final[str] = "retrieve"
+NODE_VERIFY: Final[str] = "verify"
+NODE_SYNTHESIZE: Final[str] = "synthesize"
+NODE_WEB_SEARCH_APPROVAL: Final[str] = "web_search_approval"
+NODE_WEB_SEARCH: Final[str] = "web_search"
+NODE_SUMMARIZE: Final[str] = "summarize"
+
+# Graph state keys
+STATE_QUESTION: Final[str] = "question"
+STATE_RETRIEVED_SEGMENTS: Final[str] = "retrieved_segments"
+STATE_VERIFICATION_PASSED: Final[str] = "verification_passed"
+STATE_WEB_SEARCH_APPROVED: Final[str] = "web_search_approved"
+STATE_WEB_CONTEXT: Final[str] = "web_context"
+STATE_ANSWER: Final[str] = "answer"
+STATE_CITATIONS: Final[str] = "citations"
+STATE_SUGGESTED_ANNOTATIONS: Final[str] = "suggested_annotations"
diff --git a/src/noteflow/infrastructure/ai/graphs/_shared.py b/src/noteflow/infrastructure/ai/graphs/_shared.py
new file mode 100644
index 0000000..db45e8b
--- /dev/null
+++ b/src/noteflow/infrastructure/ai/graphs/_shared.py
@@ -0,0 +1,44 @@
+"""Shared helpers for AI graph wiring."""
+
+from __future__ import annotations
+
+from typing import Protocol
+
+from noteflow.infrastructure.ai.constants import (
+    NODE_RETRIEVE,
+    NODE_SYNTHESIZE,
+    NODE_VERIFY,
+    NODE_WEB_SEARCH,
+    NODE_WEB_SEARCH_APPROVAL,
+    STATE_ANSWER,
+    STATE_CITATIONS,
+    STATE_SUGGESTED_ANNOTATIONS,
+)
+
+
+class GraphBuilder(Protocol):
+    def add_edge(self, start: object, end: object) -> None: ...
+
+
+def build_no_information_payload(answer: str) -> dict[str, object]:
+    return {
+        STATE_ANSWER: answer,
+        STATE_CITATIONS: [],
+        STATE_SUGGESTED_ANNOTATIONS: [],
+    }
+
+
+def connect_web_search_flow(builder: GraphBuilder, start: object, end: object) -> None:
+    builder.add_edge(start, NODE_RETRIEVE)
+    builder.add_edge(NODE_RETRIEVE, NODE_VERIFY)
+    builder.add_edge(NODE_VERIFY, NODE_WEB_SEARCH_APPROVAL)
+    builder.add_edge(NODE_WEB_SEARCH_APPROVAL, NODE_WEB_SEARCH)
+    builder.add_edge(NODE_WEB_SEARCH, NODE_SYNTHESIZE)
+    builder.add_edge(NODE_SYNTHESIZE, end)
+
+
+def connect_base_flow(builder: GraphBuilder, start: object, end: object) -> None:
+    builder.add_edge(start, NODE_RETRIEVE)
+    builder.add_edge(NODE_RETRIEVE, NODE_VERIFY)
+    builder.add_edge(NODE_VERIFY, NODE_SYNTHESIZE)
+    builder.add_edge(NODE_SYNTHESIZE, end)
diff --git a/src/noteflow/infrastructure/ai/graphs/meeting_qa.py b/src/noteflow/infrastructure/ai/graphs/meeting_qa.py
index 97c8f54..fb816c7 100644
--- a/src/noteflow/infrastructure/ai/graphs/meeting_qa.py
+++ b/src/noteflow/infrastructure/ai/graphs/meeting_qa.py
@@ -2,8 +2,9 @@
 
 from __future__ import annotations
 
+from collections.abc import Awaitable, Callable
 from dataclasses import dataclass
-from typing import TYPE_CHECKING, Final, TypedDict
+from typing import TYPE_CHECKING, Final, TypedDict, cast
 
 if TYPE_CHECKING:
     from langgraph.graph import CompiledStateGraph
@@ -12,6 +13,7 @@ if TYPE_CHECKING:
     from noteflow.domain.value_objects import MeetingId
     from noteflow.infrastructure.ai.nodes.annotation_suggester import SuggestedAnnotation
     from noteflow.infrastructure.ai.nodes.web_search import WebSearchProvider
+    from noteflow.infrastructure.ai.tools.synthesis import SynthesisResult
     from noteflow.infrastructure.ai.tools.retrieval import (
         EmbedderProtocol,
         RetrievalResult,
@@ -19,6 +21,27 @@ if TYPE_CHECKING:
     )
     from noteflow.infrastructure.ai.tools.synthesis import LLMProtocol
 
+from noteflow.infrastructure.ai.constants import (
+    NODE_RETRIEVE,
+    NODE_SYNTHESIZE,
+    NODE_VERIFY,
+    NODE_WEB_SEARCH,
+    NODE_WEB_SEARCH_APPROVAL,
+    STATE_ANSWER,
+    STATE_CITATIONS,
+    STATE_QUESTION,
+    STATE_RETRIEVED_SEGMENTS,
+    STATE_SUGGESTED_ANNOTATIONS,
+    STATE_VERIFICATION_PASSED,
+    STATE_WEB_CONTEXT,
+    STATE_WEB_SEARCH_APPROVED,
+)
+from noteflow.infrastructure.ai.graphs._shared import (
+    build_no_information_payload,
+    connect_base_flow,
+    connect_web_search_flow,
+)
+
 MEETING_QA_GRAPH_NAME: Final[str] = "meeting_qa"
 MEETING_QA_GRAPH_VERSION: Final[int] = 2
 NO_INFORMATION_ANSWER: Final[str] = "I couldn't find relevant information in this meeting."
@@ -31,6 +54,14 @@ class MeetingQAConfig:
     require_annotation_approval: bool = False
 
 
+@dataclass(frozen=True)
+class MeetingQADependencies:
+    embedder: "EmbedderProtocol"
+    segment_repo: "SegmentSearchProtocol"
+    llm: "LLMProtocol"
+    web_search_provider: "WebSearchProvider | None" = None
+
+
 class MeetingQAInputState(TypedDict):
     question: str
     meeting_id: MeetingId
@@ -52,142 +83,197 @@ class MeetingQAInternalState(MeetingQAInputState, MeetingQAOutputState):
 
 
 def build_meeting_qa_graph(
-    embedder: EmbedderProtocol,
-    segment_repo: SegmentSearchProtocol,
-    llm: LLMProtocol,
+    deps: MeetingQADependencies,
     *,
-    web_search_provider: WebSearchProvider | None = None,
     config: MeetingQAConfig | None = None,
     checkpointer: object | None = None,
 ) -> CompiledStateGraph[MeetingQAInternalState]:
-    """Build a Q&A graph for single-meeting questions with segment citations.
-
-    Graph flow (with web search): retrieve -> verify -> [web_search_approval] -> [web_search] -> synthesize
-    Graph flow (without): retrieve -> verify -> synthesize
-
-    Args:
-        embedder: Protocol for generating text embeddings.
-        segment_repo: Protocol for semantic segment search.
-        llm: Protocol for LLM text completion.
-        web_search_provider: Optional web search provider for augmentation.
-        config: Graph configuration for features/interrupts.
-        checkpointer: Optional checkpointer for interrupt support.
-
-    Returns:
-        Compiled graph that accepts question/meeting_id and returns answer/citations.
-    """
+    """Build a Q&A graph for single-meeting questions with segment citations."""
     from langgraph.graph import END, START, StateGraph
 
-    from noteflow.domain.ai.citations import SegmentCitation
-    from noteflow.infrastructure.ai.interrupts import check_web_search_approval
-    from noteflow.infrastructure.ai.nodes.annotation_suggester import (
-        extract_annotations_from_answer,
+    effective_config = config or MeetingQAConfig()
+    nodes = _build_meeting_nodes(deps, effective_config)
+
+    builder: StateGraph[MeetingQAInternalState] = StateGraph(MeetingQAInternalState)
+    builder.add_node(NODE_RETRIEVE, nodes.retrieve)
+    builder.add_node(NODE_VERIFY, nodes.verify)
+    builder.add_node(NODE_SYNTHESIZE, nodes.synthesize)
+
+    if nodes.web_search_approval is not None and nodes.web_search is not None:
+        builder.add_node(NODE_WEB_SEARCH_APPROVAL, nodes.web_search_approval)
+        builder.add_node(NODE_WEB_SEARCH, nodes.web_search)
+        connect_web_search_flow(builder, START, END)
+    else:
+        connect_base_flow(builder, START, END)
+
+    compile_method = getattr(builder, "compile")
+    compiled: CompiledStateGraph[MeetingQAInternalState] = compile_method(checkpointer=checkpointer)
+    return compiled
+
+
+@dataclass(frozen=True)
+class _MeetingQANodes:
+    retrieve: Callable[[MeetingQAInternalState], Awaitable[dict[str, object]]]
+    verify: Callable[[MeetingQAInternalState], Awaitable[dict[str, object]]]
+    synthesize: Callable[[MeetingQAInternalState], Awaitable[dict[str, object]]]
+    web_search_approval: Callable[[MeetingQAInternalState], Awaitable[dict[str, object]]] | None
+    web_search: Callable[[MeetingQAInternalState], Awaitable[dict[str, object]]] | None
+
+
+def _build_meeting_nodes(
+    deps: MeetingQADependencies,
+    config: MeetingQAConfig,
+) -> _MeetingQANodes:
+    allow_web_search = config.enable_web_search and deps.web_search_provider is not None
+    return _MeetingQANodes(
+        retrieve=_build_meeting_retrieve_node(deps),
+        verify=_build_verify_node(),
+        synthesize=_build_meeting_synthesize_node(deps),
+        web_search_approval=_build_meeting_web_search_approval_node(deps, config)
+        if allow_web_search
+        else None,
+        web_search=_build_meeting_web_search_node(deps, config) if allow_web_search else None,
     )
+
+
+def _build_meeting_retrieve_node(
+    deps: MeetingQADependencies,
+) -> Callable[[MeetingQAInternalState], Awaitable[dict[str, object]]]:
+    from noteflow.infrastructure.ai.tools.retrieval import (
+        MeetingRetrievalDependencies,
+        MeetingRetrievalRequest,
+        retrieve_segments,
+    )
+
+    async def retrieve_node(state: MeetingQAInternalState) -> dict[str, object]:
+        question = cast(str, state[STATE_QUESTION])
+        request = MeetingRetrievalRequest(
+            query=question,
+            meeting_id=state["meeting_id"],
+            top_k=state["top_k"],
+        )
+        results = await retrieve_segments(
+            request,
+            MeetingRetrievalDependencies(
+                embedder=deps.embedder,
+                segment_repo=deps.segment_repo,
+            ),
+        )
+        return {STATE_RETRIEVED_SEGMENTS: results}
+
+    return retrieve_node
+
+
+def _build_verify_node() -> Callable[[MeetingQAInternalState], Awaitable[dict[str, object]]]:
+    async def verify_node(state: MeetingQAInternalState) -> dict[str, object]:
+        segments = cast(list["RetrievalResult"], state[STATE_RETRIEVED_SEGMENTS])
+        has_segments = len(segments) > 0
+        return {STATE_VERIFICATION_PASSED: has_segments}
+
+    return verify_node
+
+
+def _build_meeting_web_search_approval_node(
+    deps: MeetingQADependencies,
+    config: MeetingQAConfig,
+) -> Callable[[MeetingQAInternalState], Awaitable[dict[str, object]]]:
+    from noteflow.infrastructure.ai.interrupts import check_web_search_approval
+    from noteflow.infrastructure.ai.nodes.web_search import derive_search_query
+
+    async def web_search_approval_node(state: MeetingQAInternalState) -> dict[str, object]:
+        if not config.require_web_approval:
+            return {STATE_WEB_SEARCH_APPROVED: True}
+        question = cast(str, state[STATE_QUESTION])
+        query = derive_search_query(question)
+        approved = check_web_search_approval(query, require_approval=True)
+        return {STATE_WEB_SEARCH_APPROVED: approved}
+
+    return web_search_approval_node
+
+
+def _build_meeting_web_search_node(
+    deps: MeetingQADependencies,
+    config: MeetingQAConfig,
+) -> Callable[[MeetingQAInternalState], Awaitable[dict[str, object]]]:
     from noteflow.infrastructure.ai.nodes.web_search import (
         WebSearchConfig,
         derive_search_query,
         execute_web_search,
         format_results_for_context,
     )
-    from noteflow.infrastructure.ai.tools.retrieval import retrieve_segments
-    from noteflow.infrastructure.ai.tools.synthesis import synthesize_answer
-
-    effective_config = config or MeetingQAConfig()
-
-    async def retrieve_node(state: MeetingQAInternalState) -> dict[str, object]:
-        results = await retrieve_segments(
-            query=state["question"],
-            embedder=embedder,
-            segment_repo=segment_repo,
-            meeting_id=state["meeting_id"],
-            top_k=state["top_k"],
-        )
-        return {"retrieved_segments": results}
-
-    async def verify_node(state: MeetingQAInternalState) -> dict[str, object]:
-        has_segments = len(state["retrieved_segments"]) > 0
-        return {"verification_passed": has_segments}
-
-    def web_search_approval_node(state: MeetingQAInternalState) -> dict[str, object]:
-        if not effective_config.enable_web_search or web_search_provider is None:
-            return {"web_search_approved": False}
-
-        if not effective_config.require_web_approval:
-            return {"web_search_approved": True}
-
-        query = derive_search_query(state["question"])
-        approved = check_web_search_approval(query, require_approval=True)
-        return {"web_search_approved": approved}
 
     async def web_search_node(state: MeetingQAInternalState) -> dict[str, object]:
-        if not state.get("web_search_approved", False) or web_search_provider is None:
-            return {"web_context": ""}
-
-        query = derive_search_query(state["question"])
-        search_config = WebSearchConfig(enabled=True, require_approval=False)
-        response = await execute_web_search(query, web_search_provider, search_config)
+        approved = bool(state.get(STATE_WEB_SEARCH_APPROVED, False))
+        if not approved or deps.web_search_provider is None:
+            return {STATE_WEB_CONTEXT: ""}
+        question = cast(str, state[STATE_QUESTION])
+        query = derive_search_query(question)
+        search_config = WebSearchConfig(enabled=config.enable_web_search, require_approval=False)
+        response = await execute_web_search(query, deps.web_search_provider, search_config)
         context = format_results_for_context(response.results)
-        return {"web_context": context}
+        return {STATE_WEB_CONTEXT: context}
+
+    return web_search_node
+
+
+def _build_meeting_synthesize_node(
+    deps: MeetingQADependencies,
+) -> Callable[[MeetingQAInternalState], Awaitable[dict[str, object]]]:
+    from noteflow.infrastructure.ai.nodes.annotation_suggester import (
+        extract_annotations_from_answer,
+    )
+    from noteflow.infrastructure.ai.tools.synthesis import synthesize_answer
 
     async def synthesize_node(state: MeetingQAInternalState) -> dict[str, object]:
-        if not state["verification_passed"]:
-            return {
-                "answer": NO_INFORMATION_ANSWER,
-                "citations": [],
-                "suggested_annotations": [],
-            }
-
+        if not state[STATE_VERIFICATION_PASSED]:
+            return build_no_information_payload(NO_INFORMATION_ANSWER)
+        question = cast(str, state[STATE_QUESTION])
+        segments = cast(list["RetrievalResult"], state[STATE_RETRIEVED_SEGMENTS])
         result = await synthesize_answer(
-            question=state["question"],
-            segments=state["retrieved_segments"],
-            llm=llm,
+            question=question,
+            segments=segments,
+            llm=deps.llm,
+        )
+        return _build_meeting_answer_payload(
+            meeting_id=state["meeting_id"],
+            retrieved_segments=segments,
+            result=result,
+            extract_annotations=extract_annotations_from_answer,
         )
 
-        citations = [
-            SegmentCitation(
-                meeting_id=state["meeting_id"],
-                segment_id=seg.segment_id,
-                start_time=seg.start_time,
-                end_time=seg.end_time,
-                text=seg.text,
-                score=seg.score,
-            )
-            for seg in state["retrieved_segments"]
-            if seg.segment_id in result.cited_segment_ids
-        ]
+    return synthesize_node
 
-        suggested_annotations = extract_annotations_from_answer(
-            answer=result.answer,
-            cited_segment_ids=tuple(result.cited_segment_ids),
+
+def _build_meeting_answer_payload(
+    *,
+    meeting_id: "MeetingId",
+    retrieved_segments: list["RetrievalResult"],
+    result: "SynthesisResult",
+    extract_annotations: Callable[[str, tuple[int, ...]], list["SuggestedAnnotation"]],
+) -> dict[str, object]:
+    from noteflow.domain.ai.citations import SegmentCitation
+
+    cited_ids = set(result.cited_segment_ids)
+    citations = [
+        SegmentCitation(
+            meeting_id=meeting_id,
+            segment_id=seg.segment_id,
+            start_time=seg.start_time,
+            end_time=seg.end_time,
+            text=seg.text,
+            score=seg.score,
         )
+        for seg in retrieved_segments
+        if seg.segment_id in cited_ids
+    ]
 
-        return {
-            "answer": result.answer,
-            "citations": citations,
-            "suggested_annotations": suggested_annotations,
-        }
+    suggested_annotations = extract_annotations(
+        result.answer,
+        tuple(result.cited_segment_ids),
+    )
 
-    builder: StateGraph[MeetingQAInternalState] = StateGraph(MeetingQAInternalState)
-    builder.add_node("retrieve", retrieve_node)
-    builder.add_node("verify", verify_node)
-    builder.add_node("synthesize", synthesize_node)
-
-    if effective_config.enable_web_search and web_search_provider is not None:
-        builder.add_node("web_search_approval", web_search_approval_node)
-        builder.add_node("web_search", web_search_node)
-
-        builder.add_edge(START, "retrieve")
-        builder.add_edge("retrieve", "verify")
-        builder.add_edge("verify", "web_search_approval")
-        builder.add_edge("web_search_approval", "web_search")
-        builder.add_edge("web_search", "synthesize")
-        builder.add_edge("synthesize", END)
-    else:
-        builder.add_edge(START, "retrieve")
-        builder.add_edge("retrieve", "verify")
-        builder.add_edge("verify", "synthesize")
-        builder.add_edge("synthesize", END)
-
-    compile_method = getattr(builder, "compile")
-    compiled: CompiledStateGraph[MeetingQAInternalState] = compile_method(checkpointer=checkpointer)
-    return compiled
+    return {
+        STATE_ANSWER: result.answer,
+        STATE_CITATIONS: citations,
+        STATE_SUGGESTED_ANNOTATIONS: suggested_annotations,
+    }
diff --git a/src/noteflow/infrastructure/ai/graphs/summarization.py b/src/noteflow/infrastructure/ai/graphs/summarization.py
index 3c1a5d8..806fa9c 100644
--- a/src/noteflow/infrastructure/ai/graphs/summarization.py
+++ b/src/noteflow/infrastructure/ai/graphs/summarization.py
@@ -14,10 +14,24 @@ if TYPE_CHECKING:
 
     from langgraph.graph import CompiledStateGraph
 
-    from noteflow.application.services.summarization import SummarizationService
+    from noteflow.application.services.summarization import (
+        SummarizationService,
+        SummarizationServiceResult,
+    )
+    from noteflow.domain.entities import ActionItem, KeyPoint
     from noteflow.domain.entities import Segment
     from noteflow.domain.value_objects import MeetingId
 
+from noteflow.domain.constants.fields import (
+    ACTION_ITEMS,
+    END_TIME,
+    KEY_POINTS,
+    SEGMENT_IDS,
+    START_TIME,
+    TEXT,
+)
+from noteflow.infrastructure.ai.constants import NODE_SUMMARIZE
+
 SUMMARIZATION_GRAPH_NAME: Final[str] = "summarization"
 SUMMARIZATION_GRAPH_VERSION: Final[int] = 1
 
@@ -68,36 +82,44 @@ def build_summarization_graph(
             meeting_id=meeting_id,
             segments=state["segments"],
         )
-        summary = result.summary
-        return {
-            "summary_text": summary.executive_summary,
-            "key_points": [
-                {
-                    "text": kp.text,
-                    "segment_ids": kp.segment_ids,
-                    "start_time": kp.start_time,
-                    "end_time": kp.end_time,
-                }
-                for kp in summary.key_points
-            ],
-            "action_items": [
-                {
-                    "text": ai.text,
-                    "segment_ids": ai.segment_ids,
-                    "assignee": ai.assignee,
-                    "start_time": ai.start_time,
-                    "end_time": ai.end_time,
-                }
-                for ai in summary.action_items
-            ],
-            "provider_used": result.provider_used,
-            "tokens_used": summary.tokens_used,
-            "latency_ms": summary.latency_ms,
-        }
+        return _summarization_result_to_payload(result)
 
     builder = StateGraph(SummarizationState)
-    builder.add_node("summarize", summarize_node)
-    builder.add_edge(START, "summarize")
-    builder.add_edge("summarize", END)
+    builder.add_node(NODE_SUMMARIZE, summarize_node)
+    builder.add_edge(START, NODE_SUMMARIZE)
+    builder.add_edge(NODE_SUMMARIZE, END)
 
     return builder.compile()
+
+
+def _summarization_result_to_payload(
+    result: "SummarizationServiceResult",
+) -> dict[str, object]:
+    summary = result.summary
+    return {
+        "summary_text": summary.executive_summary,
+        KEY_POINTS: [_key_point_to_payload(kp) for kp in summary.key_points],
+        ACTION_ITEMS: [_action_item_to_payload(ai) for ai in summary.action_items],
+        "provider_used": result.provider_used,
+        "tokens_used": summary.tokens_used,
+        "latency_ms": summary.latency_ms,
+    }
+
+
+def _key_point_to_payload(key_point: "KeyPoint") -> dict[str, object]:
+    return {
+        TEXT: key_point.text,
+        SEGMENT_IDS: key_point.segment_ids,
+        START_TIME: key_point.start_time,
+        END_TIME: key_point.end_time,
+    }
+
+
+def _action_item_to_payload(action_item: "ActionItem") -> dict[str, object]:
+    return {
+        TEXT: action_item.text,
+        SEGMENT_IDS: action_item.segment_ids,
+        "assignee": action_item.assignee,
+        START_TIME: action_item.start_time,
+        END_TIME: action_item.end_time,
+    }
diff --git a/src/noteflow/infrastructure/ai/graphs/workspace_qa.py b/src/noteflow/infrastructure/ai/graphs/workspace_qa.py
index 6a5a9c1..490e38f 100644
--- a/src/noteflow/infrastructure/ai/graphs/workspace_qa.py
+++ b/src/noteflow/infrastructure/ai/graphs/workspace_qa.py
@@ -2,8 +2,30 @@
 
 from __future__ import annotations
 
+from collections.abc import Awaitable, Callable
 from dataclasses import dataclass
-from typing import TYPE_CHECKING, Final, TypedDict
+from typing import TYPE_CHECKING, Final, TypedDict, cast
+
+from noteflow.infrastructure.ai.constants import (
+    NODE_RETRIEVE,
+    NODE_SYNTHESIZE,
+    NODE_VERIFY,
+    NODE_WEB_SEARCH,
+    NODE_WEB_SEARCH_APPROVAL,
+    STATE_ANSWER,
+    STATE_CITATIONS,
+    STATE_QUESTION,
+    STATE_RETRIEVED_SEGMENTS,
+    STATE_SUGGESTED_ANNOTATIONS,
+    STATE_VERIFICATION_PASSED,
+    STATE_WEB_CONTEXT,
+    STATE_WEB_SEARCH_APPROVED,
+)
+from noteflow.infrastructure.ai.graphs._shared import (
+    build_no_information_payload,
+    connect_base_flow,
+    connect_web_search_flow,
+)
 
 if TYPE_CHECKING:
     from uuid import UUID
@@ -19,7 +41,7 @@ if TYPE_CHECKING:
         RetrievalResult,
         WorkspaceSegmentSearchProtocol,
     )
-    from noteflow.infrastructure.ai.tools.synthesis import LLMProtocol
+    from noteflow.infrastructure.ai.tools.synthesis import LLMProtocol, SynthesisResult
 
 WORKSPACE_QA_GRAPH_NAME: Final[str] = "workspace_qa"
 WORKSPACE_QA_GRAPH_VERSION: Final[int] = 2
@@ -33,6 +55,14 @@ class WorkspaceQAConfig:
     require_annotation_approval: bool = False
 
 
+@dataclass(frozen=True)
+class WorkspaceQADependencies:
+    embedder: "EmbedderProtocol"
+    segment_repo: "WorkspaceSegmentSearchProtocol"
+    llm: "LLMProtocol"
+    web_search_provider: "WebSearchProvider | None" = None
+
+
 class WorkspaceQAInputState(TypedDict):
     question: str
     workspace_id: UUID
@@ -54,145 +84,199 @@ class WorkspaceQAInternalState(WorkspaceQAInputState, WorkspaceQAOutputState):
 
 
 def build_workspace_qa_graph(
-    embedder: EmbedderProtocol,
-    segment_repo: WorkspaceSegmentSearchProtocol,
-    llm: LLMProtocol,
+    deps: WorkspaceQADependencies,
     *,
-    web_search_provider: WebSearchProvider | None = None,
     config: WorkspaceQAConfig | None = None,
     checkpointer: BaseCheckpointSaver[str] | None = None,
 ) -> CompiledStateGraph[WorkspaceQAInternalState]:
-    """Build Q&A graph for cross-meeting questions with segment citations.
-
-    Graph flow (with web search): retrieve -> verify -> [web_search_approval] -> [web_search] -> synthesize
-    Graph flow (without): retrieve -> verify -> synthesize
-
-    Args:
-        embedder: Protocol for generating text embeddings.
-        segment_repo: Protocol for workspace-scoped semantic segment search.
-        llm: Protocol for LLM text completion.
-        web_search_provider: Optional web search provider for augmentation.
-        config: Graph configuration for features/interrupts.
-        checkpointer: Optional checkpointer for interrupt support.
-
-    Returns:
-        Compiled graph that accepts question/workspace_id and returns answer/citations.
-    """
+    """Build Q&A graph for cross-meeting questions with segment citations."""
     from langgraph.graph import END, START, StateGraph
 
-    from noteflow.domain.ai.citations import SegmentCitation
-    from noteflow.infrastructure.ai.interrupts import check_web_search_approval
-    from noteflow.infrastructure.ai.nodes.annotation_suggester import (
-        extract_annotations_from_answer,
-    )
-    from noteflow.infrastructure.ai.nodes.web_search import (
-        WebSearchConfig,
-        derive_search_query,
-        execute_web_search,
-        format_results_for_context,
-    )
-    from noteflow.infrastructure.ai.tools.retrieval import retrieve_segments_workspace
-    from noteflow.infrastructure.ai.tools.synthesis import synthesize_answer
-
     effective_config = config or WorkspaceQAConfig()
-
-    async def retrieve_node(state: WorkspaceQAInternalState) -> dict[str, object]:
-        results = await retrieve_segments_workspace(
-            query=state["question"],
-            embedder=embedder,
-            segment_repo=segment_repo,
-            workspace_id=state["workspace_id"],
-            project_id=state["project_id"],
-            top_k=state["top_k"],
-        )
-        return {"retrieved_segments": results}
-
-    async def verify_node(state: WorkspaceQAInternalState) -> dict[str, object]:
-        has_segments = len(state["retrieved_segments"]) > 0
-        return {"verification_passed": has_segments}
-
-    def web_search_approval_node(state: WorkspaceQAInternalState) -> dict[str, object]:
-        if not effective_config.enable_web_search or web_search_provider is None:
-            return {"web_search_approved": False}
-
-        if not effective_config.require_web_approval:
-            return {"web_search_approved": True}
-
-        query = derive_search_query(state["question"])
-        approved = check_web_search_approval(query, require_approval=True)
-        return {"web_search_approved": approved}
-
-    async def web_search_node(state: WorkspaceQAInternalState) -> dict[str, object]:
-        if not state.get("web_search_approved", False) or web_search_provider is None:
-            return {"web_context": ""}
-
-        query = derive_search_query(state["question"])
-        search_config = WebSearchConfig(enabled=True, require_approval=False)
-        response = await execute_web_search(query, web_search_provider, search_config)
-        context = format_results_for_context(response.results)
-        return {"web_context": context}
-
-    async def synthesize_node(state: WorkspaceQAInternalState) -> dict[str, object]:
-        if not state["verification_passed"]:
-            return {
-                "answer": NO_INFORMATION_ANSWER,
-                "citations": [],
-                "suggested_annotations": [],
-            }
-
-        result = await synthesize_answer(
-            question=state["question"],
-            segments=state["retrieved_segments"],
-            llm=llm,
-        )
-
-        citations = [
-            SegmentCitation(
-                meeting_id=seg.meeting_id,
-                segment_id=seg.segment_id,
-                start_time=seg.start_time,
-                end_time=seg.end_time,
-                text=seg.text,
-                score=seg.score,
-            )
-            for seg in state["retrieved_segments"]
-            if seg.segment_id in result.cited_segment_ids
-        ]
-
-        suggested_annotations = extract_annotations_from_answer(
-            answer=result.answer,
-            cited_segment_ids=tuple(result.cited_segment_ids),
-        )
-
-        return {
-            "answer": result.answer,
-            "citations": citations,
-            "suggested_annotations": suggested_annotations,
-        }
+    nodes = _build_workspace_nodes(deps, effective_config)
 
     builder: StateGraph[WorkspaceQAInternalState] = StateGraph(WorkspaceQAInternalState)
-    builder.add_node("retrieve", retrieve_node)
-    builder.add_node("verify", verify_node)
-    builder.add_node("synthesize", synthesize_node)
+    builder.add_node(NODE_RETRIEVE, nodes.retrieve)
+    builder.add_node(NODE_VERIFY, nodes.verify)
+    builder.add_node(NODE_SYNTHESIZE, nodes.synthesize)
 
-    if effective_config.enable_web_search and web_search_provider is not None:
-        builder.add_node("web_search_approval", web_search_approval_node)
-        builder.add_node("web_search", web_search_node)
-
-        builder.add_edge(START, "retrieve")
-        builder.add_edge("retrieve", "verify")
-        builder.add_edge("verify", "web_search_approval")
-        builder.add_edge("web_search_approval", "web_search")
-        builder.add_edge("web_search", "synthesize")
-        builder.add_edge("synthesize", END)
+    if nodes.web_search_approval is not None and nodes.web_search is not None:
+        builder.add_node(NODE_WEB_SEARCH_APPROVAL, nodes.web_search_approval)
+        builder.add_node(NODE_WEB_SEARCH, nodes.web_search)
+        connect_web_search_flow(builder, START, END)
     else:
-        builder.add_edge(START, "retrieve")
-        builder.add_edge("retrieve", "verify")
-        builder.add_edge("verify", "synthesize")
-        builder.add_edge("synthesize", END)
+        connect_base_flow(builder, START, END)
 
     compile_method = getattr(builder, "compile")
     compiled: CompiledStateGraph[WorkspaceQAInternalState] = compile_method(
         checkpointer=checkpointer
     )
     return compiled
+
+
+@dataclass(frozen=True)
+class _WorkspaceQANodes:
+    retrieve: Callable[[WorkspaceQAInternalState], Awaitable[dict[str, object]]]
+    verify: Callable[[WorkspaceQAInternalState], Awaitable[dict[str, object]]]
+    synthesize: Callable[[WorkspaceQAInternalState], Awaitable[dict[str, object]]]
+    web_search_approval: Callable[[WorkspaceQAInternalState], Awaitable[dict[str, object]]] | None
+    web_search: Callable[[WorkspaceQAInternalState], Awaitable[dict[str, object]]] | None
+
+
+def _build_workspace_nodes(
+    deps: WorkspaceQADependencies,
+    config: WorkspaceQAConfig,
+) -> _WorkspaceQANodes:
+    allow_web_search = config.enable_web_search and deps.web_search_provider is not None
+    return _WorkspaceQANodes(
+        retrieve=_build_workspace_retrieve_node(deps),
+        verify=_build_workspace_verify_node(),
+        synthesize=_build_workspace_synthesize_node(deps),
+        web_search_approval=_build_workspace_web_search_approval_node(deps, config)
+        if allow_web_search
+        else None,
+        web_search=_build_workspace_web_search_node(deps, config) if allow_web_search else None,
+    )
+
+
+def _build_workspace_retrieve_node(
+    deps: WorkspaceQADependencies,
+) -> Callable[[WorkspaceQAInternalState], Awaitable[dict[str, object]]]:
+    from noteflow.infrastructure.ai.tools.retrieval import (
+        WorkspaceRetrievalDependencies,
+        WorkspaceRetrievalRequest,
+        retrieve_segments_workspace,
+    )
+
+    async def retrieve_node(state: WorkspaceQAInternalState) -> dict[str, object]:
+        question = cast(str, state[STATE_QUESTION])
+        request = WorkspaceRetrievalRequest(
+            query=question,
+            workspace_id=state["workspace_id"],
+            project_id=state["project_id"],
+            top_k=state["top_k"],
+        )
+        results = await retrieve_segments_workspace(
+            request,
+            WorkspaceRetrievalDependencies(
+                embedder=deps.embedder,
+                segment_repo=deps.segment_repo,
+            ),
+        )
+        return {STATE_RETRIEVED_SEGMENTS: results}
+
+    return retrieve_node
+
+
+def _build_workspace_verify_node() -> Callable[[WorkspaceQAInternalState], Awaitable[dict[str, object]]]:
+    async def verify_node(state: WorkspaceQAInternalState) -> dict[str, object]:
+        segments = cast(list["RetrievalResult"], state[STATE_RETRIEVED_SEGMENTS])
+        has_segments = len(segments) > 0
+        return {STATE_VERIFICATION_PASSED: has_segments}
+
+    return verify_node
+
+
+def _build_workspace_web_search_approval_node(
+    deps: WorkspaceQADependencies,
+    config: WorkspaceQAConfig,
+) -> Callable[[WorkspaceQAInternalState], Awaitable[dict[str, object]]]:
+    from noteflow.infrastructure.ai.interrupts import check_web_search_approval
+    from noteflow.infrastructure.ai.nodes.web_search import derive_search_query
+
+    async def web_search_approval_node(state: WorkspaceQAInternalState) -> dict[str, object]:
+        if not config.require_web_approval:
+            return {STATE_WEB_SEARCH_APPROVED: True}
+        question = cast(str, state[STATE_QUESTION])
+        query = derive_search_query(question)
+        approved = check_web_search_approval(query, require_approval=True)
+        return {STATE_WEB_SEARCH_APPROVED: approved}
+
+    return web_search_approval_node
+
+
+def _build_workspace_web_search_node(
+    deps: WorkspaceQADependencies,
+    config: WorkspaceQAConfig,
+) -> Callable[[WorkspaceQAInternalState], Awaitable[dict[str, object]]]:
+    from noteflow.infrastructure.ai.nodes.web_search import (
+        WebSearchConfig,
+        derive_search_query,
+        execute_web_search,
+        format_results_for_context,
+    )
+
+    async def web_search_node(state: WorkspaceQAInternalState) -> dict[str, object]:
+        approved = bool(state.get(STATE_WEB_SEARCH_APPROVED, False))
+        if not approved or deps.web_search_provider is None:
+            return {STATE_WEB_CONTEXT: ""}
+        question = cast(str, state[STATE_QUESTION])
+        query = derive_search_query(question)
+        search_config = WebSearchConfig(enabled=config.enable_web_search, require_approval=False)
+        response = await execute_web_search(query, deps.web_search_provider, search_config)
+        context = format_results_for_context(response.results)
+        return {STATE_WEB_CONTEXT: context}
+
+    return web_search_node
+
+
+def _build_workspace_synthesize_node(
+    deps: WorkspaceQADependencies,
+) -> Callable[[WorkspaceQAInternalState], Awaitable[dict[str, object]]]:
+    from noteflow.infrastructure.ai.nodes.annotation_suggester import (
+        extract_annotations_from_answer,
+    )
+    from noteflow.infrastructure.ai.tools.synthesis import synthesize_answer
+
+    async def synthesize_node(state: WorkspaceQAInternalState) -> dict[str, object]:
+        if not state[STATE_VERIFICATION_PASSED]:
+            return build_no_information_payload(NO_INFORMATION_ANSWER)
+
+        question = cast(str, state[STATE_QUESTION])
+        segments = cast(list["RetrievalResult"], state[STATE_RETRIEVED_SEGMENTS])
+        result = await synthesize_answer(
+            question=question,
+            segments=segments,
+            llm=deps.llm,
+        )
+        return _build_workspace_answer_payload(
+            retrieved_segments=segments,
+            result=result,
+            extract_annotations=extract_annotations_from_answer,
+        )
+
+    return synthesize_node
+
+
+def _build_workspace_answer_payload(
+    *,
+    retrieved_segments: list["RetrievalResult"],
+    result: "SynthesisResult",
+    extract_annotations: Callable[[str, tuple[int, ...]], list["SuggestedAnnotation"]],
+) -> dict[str, object]:
+    from noteflow.domain.ai.citations import SegmentCitation
+
+    cited_ids = set(result.cited_segment_ids)
+    citations = [
+        SegmentCitation(
+            meeting_id=seg.meeting_id,
+            segment_id=seg.segment_id,
+            start_time=seg.start_time,
+            end_time=seg.end_time,
+            text=seg.text,
+            score=seg.score,
+        )
+        for seg in retrieved_segments
+        if seg.segment_id in cited_ids
+    ]
+
+    suggested_annotations = extract_annotations(
+        result.answer,
+        tuple(result.cited_segment_ids),
+    )
+
+    return {
+        STATE_ANSWER: result.answer,
+        STATE_CITATIONS: citations,
+        STATE_SUGGESTED_ANNOTATIONS: suggested_annotations,
+    }
diff --git a/src/noteflow/infrastructure/ai/guardrails.py b/src/noteflow/infrastructure/ai/guardrails.py
index dfe448d..11ae77d 100644
--- a/src/noteflow/infrastructure/ai/guardrails.py
+++ b/src/noteflow/infrastructure/ai/guardrails.py
@@ -7,6 +7,7 @@ from dataclasses import dataclass, field
 from enum import Enum
 from typing import Final
 
+from noteflow.domain.constants.fields import EMAIL
 from noteflow.infrastructure.logging import get_logger
 
 logger = get_logger(__name__)
@@ -27,7 +28,7 @@ SSN_PATTERN: Final[re.Pattern[str]] = re.compile(r"\b\d{3}-\d{2}-\d{4}\b")
 CREDIT_CARD_PATTERN: Final[re.Pattern[str]] = re.compile(r"\b(?:\d{4}[-\s]?){3}\d{4}\b")
 
 PII_PATTERNS: Final[tuple[tuple[str, re.Pattern[str]], ...]] = (
-    ("email", EMAIL_PATTERN),
+    (EMAIL, EMAIL_PATTERN),
     ("phone", PHONE_PATTERN),
     ("ssn", SSN_PATTERN),
     ("credit_card", CREDIT_CARD_PATTERN),
@@ -35,6 +36,7 @@ PII_PATTERNS: Final[tuple[tuple[str, re.Pattern[str]], ...]] = (
 
 # Redaction placeholder
 PII_REDACTION: Final[str] = "[REDACTED]"
+CHARACTER_SUFFIX: Final[str] = " characters"
 
 
 class GuardrailViolation(str, Enum):
@@ -57,33 +59,6 @@ class GuardrailResult:
     reason: str | None = None
     filtered_content: str | None = None
 
-    @staticmethod
-    def ok(content: str | None = None) -> GuardrailResult:
-        """Create a passing result."""
-        return GuardrailResult(allowed=True, filtered_content=content)
-
-    @staticmethod
-    def blocked(
-        violation: GuardrailViolation,
-        reason: str,
-    ) -> GuardrailResult:
-        """Create a blocking result."""
-        return GuardrailResult(allowed=False, violation=violation, reason=reason)
-
-    @staticmethod
-    def filtered(
-        content: str,
-        violation: GuardrailViolation,
-        reason: str,
-    ) -> GuardrailResult:
-        """Create a result with filtered content."""
-        return GuardrailResult(
-            allowed=True,
-            violation=violation,
-            reason=reason,
-            filtered_content=content,
-        )
-
 
 @dataclass
 class GuardrailRules:
@@ -126,22 +101,16 @@ def _check_length(
 ) -> GuardrailResult | None:
     """Check text length constraints."""
     if is_input and len(text) < min_length:
-        return GuardrailResult.blocked(
-            GuardrailViolation.INPUT_TOO_SHORT,
-            f"Input must be at least {min_length} characters",
-        )
+        reason = f"Input must be at least {min_length}{CHARACTER_SUFFIX}"
+        return _blocked_result(GuardrailViolation.INPUT_TOO_SHORT, reason)
 
     if is_input and len(text) > max_length:
-        return GuardrailResult.blocked(
-            GuardrailViolation.INPUT_TOO_LONG,
-            f"Input must be at most {max_length} characters",
-        )
+        reason = f"Input must be at most {max_length}{CHARACTER_SUFFIX}"
+        return _blocked_result(GuardrailViolation.INPUT_TOO_LONG, reason)
 
     if not is_input and len(text) > max_length:
-        return GuardrailResult.blocked(
-            GuardrailViolation.OUTPUT_TOO_LONG,
-            f"Output exceeds {max_length} characters",
-        )
+        reason = f"Output exceeds {max_length}{CHARACTER_SUFFIX}"
+        return _blocked_result(GuardrailViolation.OUTPUT_TOO_LONG, reason)
 
     return None
 
@@ -155,7 +124,7 @@ def _check_blocked_phrases(
     for phrase in blocked_phrases:
         if phrase.lower() in text_lower:
             logger.warning("blocked_phrase_detected", phrase=phrase[:20])
-            return GuardrailResult.blocked(
+            return _blocked_result(
                 GuardrailViolation.BLOCKED_CONTENT,
                 "Content contains blocked phrase",
             )
@@ -167,7 +136,7 @@ def _check_injection(text: str) -> GuardrailResult | None:
     for pattern in INJECTION_PATTERNS:
         if pattern.search(text):
             logger.warning("injection_attempt_detected")
-            return GuardrailResult.blocked(
+            return _blocked_result(
                 GuardrailViolation.INJECTION_ATTEMPT,
                 "Potential prompt injection detected",
             )
@@ -182,8 +151,7 @@ def _detect_pii(text: str) -> list[tuple[str, str]]:
     """
     findings: list[tuple[str, str]] = []
     for pii_type, pattern in PII_PATTERNS:
-        for match in pattern.finditer(text):
-            findings.append((pii_type, match.group()))
+        findings.extend((pii_type, match.group()) for match in pattern.finditer(text))
     return findings
 
 
@@ -205,7 +173,6 @@ async def check_input(text: str, rules: GuardrailRules) -> GuardrailResult:
     Returns:
         GuardrailResult indicating if input is allowed.
     """
-    # Length checks
     length_result = _check_length(
         text,
         rules.min_input_length,
@@ -215,39 +182,19 @@ async def check_input(text: str, rules: GuardrailRules) -> GuardrailResult:
     if length_result is not None:
         return length_result
 
-    # Blocked phrases
     phrase_result = _check_blocked_phrases(text, rules.blocked_phrases)
     if phrase_result is not None:
         return phrase_result
 
-    # Injection detection
-    if rules.detect_injection:
-        injection_result = _check_injection(text)
-        if injection_result is not None:
-            return injection_result
+    injection_result = _check_injection_if_enabled(text, rules.detect_injection)
+    if injection_result is not None:
+        return injection_result
 
-    # PII checks
-    if rules.block_pii or rules.redact_pii:
-        pii_findings = _detect_pii(text)
-        if pii_findings:
-            pii_types = [f[0] for f in pii_findings]
-            logger.info("pii_detected_in_input", pii_types=pii_types)
+    pii_result = _handle_pii_input(text, rules)
+    if pii_result is not None:
+        return pii_result
 
-            if rules.block_pii:
-                return GuardrailResult.blocked(
-                    GuardrailViolation.CONTAINS_PII,
-                    f"Input contains PII: {', '.join(pii_types)}",
-                )
-
-            # Redact instead of block
-            redacted = _redact_pii(text)
-            return GuardrailResult.filtered(
-                redacted,
-                GuardrailViolation.CONTAINS_PII,
-                f"PII redacted: {', '.join(pii_types)}",
-            )
-
-    return GuardrailResult.ok(text)
+    return _allowed_result(text)
 
 
 async def filter_output(text: str, rules: GuardrailRules) -> GuardrailResult:
@@ -260,7 +207,6 @@ async def filter_output(text: str, rules: GuardrailRules) -> GuardrailResult:
     Returns:
         GuardrailResult with potentially filtered content.
     """
-    # Length check
     length_result = _check_length(
         text,
         min_length=0,  # No minimum for output
@@ -268,45 +214,92 @@ async def filter_output(text: str, rules: GuardrailRules) -> GuardrailResult:
         is_input=False,
     )
     if length_result is not None:
-        # Truncate instead of blocking for output
         truncated = text[: rules.max_output_length]
-        return GuardrailResult.filtered(
+        reason = f"Output truncated to {rules.max_output_length}{CHARACTER_SUFFIX}"
+        return _filtered_result(
             truncated,
             GuardrailViolation.OUTPUT_TOO_LONG,
-            f"Output truncated to {rules.max_output_length} characters",
+            reason,
         )
 
-    # Blocked phrases in output
     phrase_result = _check_blocked_phrases(text, rules.blocked_phrases)
     if phrase_result is not None:
         return phrase_result
 
-    # PII redaction in output (always redact, never block output)
-    if rules.redact_pii:
-        pii_findings = _detect_pii(text)
-        if pii_findings:
-            pii_types = [f[0] for f in pii_findings]
-            logger.info("pii_detected_in_output", pii_types=pii_types)
-            redacted = _redact_pii(text)
-            return GuardrailResult.filtered(
-                redacted,
-                GuardrailViolation.CONTAINS_PII,
-                f"PII redacted: {', '.join(pii_types)}",
-            )
+    if rules.redact_pii and (pii_findings := _detect_pii(text)):
+        pii_types = [f[0] for f in pii_findings]
+        logger.info("pii_detected_in_output", pii_types=pii_types)
+        redacted = _redact_pii(text)
+        reason = f"PII redacted: {', '.join(pii_types)}"
+        return _filtered_result(redacted, GuardrailViolation.CONTAINS_PII, reason)
 
-    return GuardrailResult.ok(text)
+    return _allowed_result(text)
 
 
 def create_default_rules() -> GuardrailRules:
     """Create default guardrail rules."""
-    return GuardrailRules()
+    rules = GuardrailRules()
+    return rules
 
 
 def create_strict_rules() -> GuardrailRules:
     """Create strict guardrail rules with PII blocking."""
-    return GuardrailRules(
+    rules = GuardrailRules(
         block_pii=True,
         redact_pii=False,
         detect_injection=True,
         max_input_length=2000,
     )
+    return rules
+
+
+def _blocked_result(
+    violation: GuardrailViolation,
+    reason: str,
+) -> GuardrailResult:
+    return GuardrailResult(allowed=False, violation=violation, reason=reason)
+
+
+def _filtered_result(
+    content: str,
+    violation: GuardrailViolation,
+    reason: str,
+) -> GuardrailResult:
+    return GuardrailResult(
+        allowed=True,
+        violation=violation,
+        reason=reason,
+        filtered_content=content,
+    )
+
+
+def _allowed_result(content: str | None = None) -> GuardrailResult:
+    return GuardrailResult(allowed=True, filtered_content=content)
+
+
+def _check_injection_if_enabled(
+    text: str,
+    detect_injection: bool,
+) -> GuardrailResult | None:
+    if not detect_injection:
+        return None
+    return _check_injection(text)
+
+
+def _handle_pii_input(text: str, rules: GuardrailRules) -> GuardrailResult | None:
+    if not (rules.block_pii or rules.redact_pii):
+        return None
+    pii_findings = _detect_pii(text)
+    if not pii_findings:
+        return None
+
+    pii_types = [f[0] for f in pii_findings]
+    logger.info("pii_detected_in_input", pii_types=pii_types)
+
+    if rules.block_pii:
+        reason = f"Input contains PII: {', '.join(pii_types)}"
+        return _blocked_result(GuardrailViolation.CONTAINS_PII, reason)
+
+    redacted = _redact_pii(text)
+    reason = f"PII redacted: {', '.join(pii_types)}"
+    return _filtered_result(redacted, GuardrailViolation.CONTAINS_PII, reason)
diff --git a/src/noteflow/infrastructure/ai/interrupts.py b/src/noteflow/infrastructure/ai/interrupts.py
index 98a6f66..a2d56c4 100644
--- a/src/noteflow/infrastructure/ai/interrupts.py
+++ b/src/noteflow/infrastructure/ai/interrupts.py
@@ -5,17 +5,20 @@ Wraps LangGraph's interrupt() and Command APIs for consistent usage across graph
 
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Final
+from typing import TYPE_CHECKING, Any, Final, cast
 from uuid import uuid4
 
 from langgraph.types import Command, interrupt
 
+from noteflow.infrastructure.ai._langgraph_compat import create_command
+
 from noteflow.domain.ai.interrupts import (
     InterruptAction,
     InterruptResponse,
     create_annotation_interrupt,
     create_web_search_interrupt,
 )
+from noteflow.domain.constants.fields import ACTION
 from noteflow.infrastructure.logging import get_logger
 
 if TYPE_CHECKING:
@@ -54,7 +57,7 @@ def request_web_search_approval(
         query_preview=query[:50],
     )
 
-    response_data = interrupt(interrupt_request.to_dict())
+    response_data = interrupt(interrupt_request.to_request_payload())
 
     return _parse_interrupt_response(response_data, request_id)
 
@@ -71,7 +74,7 @@ def request_annotation_approval(
         InterruptResponse with user's decision.
     """
     request_id = str(uuid4())
-    annotation_dicts = [ann.to_dict() for ann in annotations]
+    annotation_dicts = [ann.to_annotation_payload() for ann in annotations]
     interrupt_request = create_annotation_interrupt(
         annotations=annotation_dicts,
         request_id=request_id,
@@ -83,7 +86,7 @@ def request_annotation_approval(
         annotation_count=len(annotations),
     )
 
-    response_data = interrupt(interrupt_request.to_dict())
+    response_data = interrupt(interrupt_request.to_request_payload())
 
     return _parse_interrupt_response(response_data, request_id)
 
@@ -106,16 +109,20 @@ def _parse_interrupt_response(
         return InterruptResponse(action=action, request_id=request_id)
 
     if isinstance(response_data, dict):
-        action_str = str(response_data.get("action", "reject"))
+        # Cast to typed dict after isinstance check for type narrowing
+        data: dict[str, object] = cast(dict[str, object], response_data)
+        action_str = str(data.get(ACTION, InterruptAction.REJECT.value))
         action = _string_to_action(action_str)
 
-        modified_value = response_data.get("modified_value")
-        if modified_value is not None and not isinstance(modified_value, dict):
-            modified_value = None
+        modified_value_raw = data.get("modified_value")
+        modified_value: dict[str, object] | None = None
+        if isinstance(modified_value_raw, dict):
+            modified_value = cast(dict[str, object], modified_value_raw)
 
-        user_message = response_data.get("user_message")
-        if user_message is not None:
-            user_message = str(user_message)
+        user_message: str | None = None
+        user_message_raw = data.get("user_message")
+        if user_message_raw is not None:
+            user_message = str(user_message_raw)
 
         return InterruptResponse(
             action=action,
@@ -135,14 +142,20 @@ def _parse_interrupt_response(
 def _string_to_action(value: str) -> InterruptAction:
     """Convert string response to InterruptAction."""
     normalized = value.lower().strip()
-    if normalized in ("approve", "yes", "approved", "accept"):
+    approve_values = {
+        InterruptAction.APPROVE.value,
+        "yes",
+        "approved",
+        "accept",
+    }
+    if normalized in approve_values:
         return InterruptAction.APPROVE
-    if normalized in ("modify", "edit", "change"):
+    if normalized in {InterruptAction.MODIFY.value, "edit", "change"}:
         return InterruptAction.MODIFY
     return InterruptAction.REJECT
 
 
-def create_resume_command(response: InterruptResponse) -> Command[None]:
+def create_resume_command(response: InterruptResponse) -> Command[Any]:
     """Create a LangGraph Command to resume execution with user response.
 
     Args:
@@ -151,7 +164,8 @@ def create_resume_command(response: InterruptResponse) -> Command[None]:
     Returns:
         Command to resume graph execution.
     """
-    return Command(resume=response.to_dict())
+    payload = response.to_response_payload()
+    return create_command(resume=payload)
 
 
 class InterruptHandler:
@@ -166,6 +180,8 @@ class InterruptHandler:
         return self._require_web_approval
 
     def request_web_search(self, query: str) -> InterruptResponse:
+        if not self._require_web_approval:
+            return InterruptResponse(action=InterruptAction.APPROVE)
         return request_web_search_approval(query)
 
     def request_annotation_approval(
@@ -214,18 +230,46 @@ def check_annotation_approval(
     if response.is_rejected:
         return False, []
 
-    if response.is_modified and response.modified_value:
-        modified_list_raw = response.modified_value.get("annotations", [])
-        if isinstance(modified_list_raw, list):
-            from noteflow.infrastructure.ai.nodes.annotation_suggester import (
-                SuggestedAnnotation,
-            )
-
-            modified_annotations: list[SuggestedAnnotation] = []
-            for item in modified_list_raw:
-                if isinstance(item, dict):
-                    item_dict: dict[str, object] = {str(k): v for k, v in item.items()}
-                    modified_annotations.append(SuggestedAnnotation.from_dict(item_dict))
-            return True, modified_annotations
+    modified = _extract_modified_annotations(response)
+    if modified is not None:
+        return True, modified
 
     return response.is_approved, annotations
+
+
+def _extract_modified_annotations(
+    response: InterruptResponse,
+) -> list[SuggestedAnnotation] | None:
+    if not response.is_modified:
+        return None
+    modified_value = response.modified_value
+    if not isinstance(modified_value, dict):
+        return None
+    raw_annotations = modified_value.get("annotations")
+    if not isinstance(raw_annotations, list):
+        return None
+    return _coerce_annotation_payloads(cast(list[object], raw_annotations))
+
+
+def _coerce_annotation_payloads(
+    raw_annotations: list[object],
+) -> list[SuggestedAnnotation]:
+    from noteflow.infrastructure.ai.nodes.annotation_suggester import (
+        SuggestedAnnotation,
+    )
+
+    modified_annotations: list[SuggestedAnnotation] = []
+    for item in raw_annotations:
+        item_dict = _normalize_annotation_payload(item)
+        if item_dict is not None:
+            modified_annotations.append(SuggestedAnnotation.from_payload(item_dict))
+    return modified_annotations
+
+
+def _normalize_annotation_payload(item: object) -> dict[str, object] | None:
+    if not isinstance(item, dict):
+        return None
+    item_dict: dict[str, object] = {}
+    for key, value in cast(dict[object, object], item).items():
+        item_dict[str(key)] = value
+    return item_dict
diff --git a/src/noteflow/infrastructure/ai/nodes/annotation_suggester.py b/src/noteflow/infrastructure/ai/nodes/annotation_suggester.py
index 2a3ef39..b748f82 100644
--- a/src/noteflow/infrastructure/ai/nodes/annotation_suggester.py
+++ b/src/noteflow/infrastructure/ai/nodes/annotation_suggester.py
@@ -5,13 +5,28 @@ from __future__ import annotations
 import re
 from dataclasses import dataclass
 from enum import Enum
-from typing import Final
+from itertools import chain
+from typing import Final, cast
+
+from noteflow.domain.constants.fields import (
+    ACTION_ITEM,
+    CONFIDENCE,
+    DECISION,
+    NOTE,
+    SEGMENT_IDS,
+    TEXT,
+)
+
+
+DEFAULT_CONFIDENCE: Final[float] = 0.8
+ACTION_ITEM_CONFIDENCE: Final[float] = 0.7
+DECISION_CONFIDENCE: Final[float] = 0.75
 
 
 class SuggestedAnnotationType(str, Enum):
-    ACTION_ITEM = "action_item"
-    DECISION = "decision"
-    NOTE = "note"
+    ACTION_ITEM = ACTION_ITEM
+    DECISION = DECISION
+    NOTE = NOTE
 
 
 @dataclass(frozen=True)
@@ -19,35 +34,23 @@ class SuggestedAnnotation:
     text: str
     annotation_type: SuggestedAnnotationType
     segment_ids: tuple[int, ...]
-    confidence: float = 0.8
+    confidence: float = DEFAULT_CONFIDENCE
 
-    def to_dict(self) -> dict[str, object]:
+    def to_annotation_payload(self) -> dict[str, object]:
         return {
-            "text": self.text,
+            TEXT: self.text,
             "type": self.annotation_type.value,
-            "segment_ids": list(self.segment_ids),
-            "confidence": self.confidence,
+            SEGMENT_IDS: list(self.segment_ids),
+            CONFIDENCE: self.confidence,
         }
 
     @classmethod
-    def from_dict(cls, data: dict[str, object]) -> SuggestedAnnotation:
-        text = str(data.get("text", ""))
-        type_str = str(data.get("type", "note"))
-        segment_ids_raw = data.get("segment_ids", [])
-        if isinstance(segment_ids_raw, list):
-            segment_ids = tuple(
-                int(sid) for sid in segment_ids_raw if isinstance(sid, (int, float))
-            )
-        else:
-            segment_ids = ()
-        confidence_raw = data.get("confidence", 0.8)
-        confidence = float(confidence_raw) if isinstance(confidence_raw, (int, float)) else 0.8
-
-        try:
-            annotation_type = SuggestedAnnotationType(type_str)
-        except ValueError:
-            annotation_type = SuggestedAnnotationType.NOTE
-
+    def from_payload(cls, data: dict[str, object]) -> SuggestedAnnotation:
+        text = str(data.get(TEXT, ""))
+        type_str = str(data.get("type", NOTE))
+        segment_ids = _parse_segment_ids(data.get(SEGMENT_IDS))
+        confidence = _parse_confidence(data.get(CONFIDENCE))
+        annotation_type = _parse_annotation_type(type_str)
         return cls(
             text=text,
             annotation_type=annotation_type,
@@ -72,40 +75,92 @@ MIN_TEXT_LENGTH: Final[int] = 10
 MAX_TEXT_LENGTH: Final[int] = 200
 
 
+@dataclass(frozen=True)
+class SuggestionCriteria:
+    patterns: tuple[re.Pattern[str], ...]
+    annotation_type: SuggestedAnnotationType
+    confidence: float
+    segment_ids: tuple[int, ...]
+
+
 def extract_annotations_from_answer(
     answer: str,
     cited_segment_ids: tuple[int, ...],
 ) -> list[SuggestedAnnotation]:
     """Extract action items and decisions from synthesized answer."""
+    action_criteria = SuggestionCriteria(
+        patterns=ACTION_ITEM_PATTERNS,
+        annotation_type=SuggestedAnnotationType.ACTION_ITEM,
+        confidence=ACTION_ITEM_CONFIDENCE,
+        segment_ids=cited_segment_ids,
+    )
+    decision_criteria = SuggestionCriteria(
+        patterns=DECISION_PATTERNS,
+        annotation_type=SuggestedAnnotationType.DECISION,
+        confidence=DECISION_CONFIDENCE,
+        segment_ids=cited_segment_ids,
+    )
+    action_suggestions = _collect_suggestions(answer, action_criteria)
+    decision_suggestions = _collect_suggestions(answer, decision_criteria)
+
+    return _dedupe_suggestions(action_suggestions + decision_suggestions)
+
+
+def _collect_suggestions(
+    answer: str,
+    criteria: SuggestionCriteria,
+) -> list[SuggestedAnnotation]:
     suggestions: list[SuggestedAnnotation] = []
-
-    for pattern in ACTION_ITEM_PATTERNS:
-        for match in pattern.finditer(answer):
-            text = match.group(1).strip()
-            if MIN_TEXT_LENGTH <= len(text) <= MAX_TEXT_LENGTH:
-                suggestions.append(
-                    SuggestedAnnotation(
-                        text=text,
-                        annotation_type=SuggestedAnnotationType.ACTION_ITEM,
-                        segment_ids=cited_segment_ids,
-                        confidence=0.7,
-                    )
+    for match in chain.from_iterable(
+        pattern.finditer(answer) for pattern in criteria.patterns
+    ):
+        text = match.group(1).strip()
+        if _is_valid_suggestion_text(text):
+            suggestions.append(
+                SuggestedAnnotation(
+                    text=text,
+                    annotation_type=criteria.annotation_type,
+                    segment_ids=criteria.segment_ids,
+                    confidence=criteria.confidence,
                 )
+            )
+    return suggestions
 
-    for pattern in DECISION_PATTERNS:
-        for match in pattern.finditer(answer):
-            text = match.group(1).strip()
-            if MIN_TEXT_LENGTH <= len(text) <= MAX_TEXT_LENGTH:
-                suggestions.append(
-                    SuggestedAnnotation(
-                        text=text,
-                        annotation_type=SuggestedAnnotationType.DECISION,
-                        segment_ids=cited_segment_ids,
-                        confidence=0.75,
-                    )
-                )
 
-    return _dedupe_suggestions(suggestions)
+def _is_valid_suggestion_text(text: str) -> bool:
+    return MIN_TEXT_LENGTH <= len(text) <= MAX_TEXT_LENGTH
+
+
+def _parse_segment_ids(value: object) -> tuple[int, ...]:
+    if not isinstance(value, list):
+        return ()
+    segment_ids_list = [
+        converted
+        for raw_sid in cast(list[object], value)
+        if (converted := _coerce_segment_id(raw_sid)) is not None
+    ]
+    return tuple(segment_ids_list)
+
+
+def _parse_confidence(value: object) -> float:
+    if isinstance(value, (int, float)):
+        return float(value)
+    return DEFAULT_CONFIDENCE
+
+
+def _coerce_segment_id(value: object) -> int | None:
+    if isinstance(value, int):
+        return value
+    if isinstance(value, float):
+        return int(value)
+    return None
+
+
+def _parse_annotation_type(type_str: str) -> SuggestedAnnotationType:
+    try:
+        return SuggestedAnnotationType(type_str)
+    except ValueError:
+        return SuggestedAnnotationType.NOTE
 
 
 def _dedupe_suggestions(suggestions: list[SuggestedAnnotation]) -> list[SuggestedAnnotation]:
diff --git a/src/noteflow/infrastructure/ai/nodes/web_search.py b/src/noteflow/infrastructure/ai/nodes/web_search.py
index a070c55..7c8c909 100644
--- a/src/noteflow/infrastructure/ai/nodes/web_search.py
+++ b/src/noteflow/infrastructure/ai/nodes/web_search.py
@@ -22,7 +22,7 @@ class WebSearchResult:
     snippet: str
     score: float = 1.0
 
-    def to_dict(self) -> dict[str, object]:
+    def to_result_payload(self) -> dict[str, object]:
         """Convert to dictionary for serialization."""
         return {
             "title": self.title,
diff --git a/src/noteflow/infrastructure/ai/tools/retrieval.py b/src/noteflow/infrastructure/ai/tools/retrieval.py
index 4795e99..fd24779 100644
--- a/src/noteflow/infrastructure/ai/tools/retrieval.py
+++ b/src/noteflow/infrastructure/ai/tools/retrieval.py
@@ -73,6 +73,48 @@ class RetrievalResult:
     score: float
 
 
+@dataclass(frozen=True)
+class MeetingRetrievalRequest:
+    query: str
+    meeting_id: MeetingId | None = None
+    top_k: int = 8
+
+
+@dataclass(frozen=True)
+class WorkspaceRetrievalRequest:
+    query: str
+    workspace_id: UUID
+    project_id: UUID | None = None
+    top_k: int = 20
+
+
+@dataclass(frozen=True)
+class MeetingBatchRetrievalRequest:
+    queries: Sequence[str]
+    meeting_id: MeetingId | None = None
+    top_k: int = 8
+
+
+@dataclass(frozen=True)
+class WorkspaceBatchRetrievalRequest:
+    queries: Sequence[str]
+    workspace_id: UUID
+    project_id: UUID | None = None
+    top_k: int = 20
+
+
+@dataclass(frozen=True)
+class MeetingRetrievalDependencies:
+    embedder: EmbedderProtocol
+    segment_repo: SegmentSearchProtocol
+
+
+@dataclass(frozen=True)
+class WorkspaceRetrievalDependencies:
+    embedder: EmbedderProtocol
+    segment_repo: WorkspaceSegmentSearchProtocol
+
+
 def _meeting_id_to_uuid(mid: MeetingId | None) -> UUID:
     if mid is None:
         msg = "meeting_id is required for RetrievalResult"
@@ -80,20 +122,9 @@ def _meeting_id_to_uuid(mid: MeetingId | None) -> UUID:
     return UUID(str(mid))
 
 
-async def retrieve_segments(
-    query: str,
-    embedder: EmbedderProtocol,
-    segment_repo: SegmentSearchProtocol,
-    meeting_id: MeetingId | None = None,
-    top_k: int = 8,
+def _build_retrieval_results(
+    results: Sequence[tuple[SegmentLike, float]],
 ) -> list[RetrievalResult]:
-    """Retrieve relevant transcript segments via semantic search."""
-    query_embedding = await embedder.embed(query)
-    results = await segment_repo.search_semantic(
-        query_embedding=query_embedding,
-        limit=top_k,
-        meeting_id=meeting_id,
-    )
     return [
         RetrievalResult(
             segment_id=segment.segment_id,
@@ -107,33 +138,33 @@ async def retrieve_segments(
     ]
 
 
+async def retrieve_segments(
+    request: MeetingRetrievalRequest,
+    deps: MeetingRetrievalDependencies,
+) -> list[RetrievalResult]:
+    """Retrieve relevant transcript segments via semantic search."""
+    query_embedding = await deps.embedder.embed(request.query)
+    results = await deps.segment_repo.search_semantic(
+        query_embedding=query_embedding,
+        limit=request.top_k,
+        meeting_id=request.meeting_id,
+    )
+    return _build_retrieval_results(results)
+
+
 async def retrieve_segments_workspace(
-    query: str,
-    embedder: EmbedderProtocol,
-    segment_repo: WorkspaceSegmentSearchProtocol,
-    workspace_id: UUID,
-    project_id: UUID | None = None,
-    top_k: int = 20,
+    request: WorkspaceRetrievalRequest,
+    deps: WorkspaceRetrievalDependencies,
 ) -> list[RetrievalResult]:
     """Retrieve relevant transcript segments across workspace/project via semantic search."""
-    query_embedding = await embedder.embed(query)
-    results = await segment_repo.search_semantic_workspace(
+    query_embedding = await deps.embedder.embed(request.query)
+    results = await deps.segment_repo.search_semantic_workspace(
         query_embedding=query_embedding,
-        workspace_id=workspace_id,
-        project_id=project_id,
-        limit=top_k,
+        workspace_id=request.workspace_id,
+        project_id=request.project_id,
+        limit=request.top_k,
     )
-    return [
-        RetrievalResult(
-            segment_id=segment.segment_id,
-            meeting_id=_meeting_id_to_uuid(segment.meeting_id),
-            text=segment.text,
-            start_time=segment.start_time,
-            end_time=segment.end_time,
-            score=score,
-        )
-        for segment, score in results
-    ]
+    return _build_retrieval_results(results)
 
 
 async def _embed_batch_fallback(
@@ -154,84 +185,57 @@ async def _embed_batch_fallback(
 
 
 async def retrieve_segments_batch(
-    queries: Sequence[str],
-    embedder: EmbedderProtocol,
-    segment_repo: SegmentSearchProtocol,
-    meeting_id: MeetingId | None = None,
-    top_k: int = 8,
+    request: MeetingBatchRetrievalRequest,
+    deps: MeetingRetrievalDependencies,
 ) -> list[list[RetrievalResult]]:
     """Retrieve segments for multiple queries in parallel.
 
     Uses batch embedding when available, then parallel search execution.
     Returns results in the same order as input queries.
     """
-    if not queries:
+    if not request.queries:
         return []
-    embeddings = await _embed_batch_fallback(list(queries), embedder)
+    embeddings = await _embed_batch_fallback(list(request.queries), deps.embedder)
 
     semaphore = asyncio.Semaphore(MAX_CONCURRENT_OPERATIONS)
 
     async def _search(emb: list[float]) -> list[RetrievalResult]:
         async with semaphore:
-            results = await segment_repo.search_semantic(
+            results = await deps.segment_repo.search_semantic(
                 query_embedding=emb,
-                limit=top_k,
-                meeting_id=meeting_id,
+                limit=request.top_k,
+                meeting_id=request.meeting_id,
             )
-            return [
-                RetrievalResult(
-                    segment_id=seg.segment_id,
-                    meeting_id=_meeting_id_to_uuid(seg.meeting_id),
-                    text=seg.text,
-                    start_time=seg.start_time,
-                    end_time=seg.end_time,
-                    score=score,
-                )
-                for seg, score in results
-            ]
+            return _build_retrieval_results(results)
 
     search_results = await asyncio.gather(*(_search(emb) for emb in embeddings))
     return list(search_results)
 
 
 async def retrieve_segments_workspace_batch(
-    queries: Sequence[str],
-    embedder: EmbedderProtocol,
-    segment_repo: WorkspaceSegmentSearchProtocol,
-    workspace_id: UUID,
-    project_id: UUID | None = None,
-    top_k: int = 20,
+    request: WorkspaceBatchRetrievalRequest,
+    deps: WorkspaceRetrievalDependencies,
 ) -> list[list[RetrievalResult]]:
     """Retrieve workspace segments for multiple queries in parallel.
 
     Uses batch embedding when available, then parallel search execution.
     Returns results in the same order as input queries.
     """
-    if not queries:
+    if not request.queries:
         return []
-    embeddings = await _embed_batch_fallback(list(queries), embedder)
+    embeddings = await _embed_batch_fallback(list(request.queries), deps.embedder)
 
     semaphore = asyncio.Semaphore(MAX_CONCURRENT_OPERATIONS)
 
     async def _search(emb: list[float]) -> list[RetrievalResult]:
         async with semaphore:
-            results = await segment_repo.search_semantic_workspace(
+            results = await deps.segment_repo.search_semantic_workspace(
                 query_embedding=emb,
-                workspace_id=workspace_id,
-                project_id=project_id,
-                limit=top_k,
+                workspace_id=request.workspace_id,
+                project_id=request.project_id,
+                limit=request.top_k,
             )
-            return [
-                RetrievalResult(
-                    segment_id=seg.segment_id,
-                    meeting_id=_meeting_id_to_uuid(seg.meeting_id),
-                    text=seg.text,
-                    start_time=seg.start_time,
-                    end_time=seg.end_time,
-                    score=score,
-                )
-                for seg, score in results
-            ]
+            return _build_retrieval_results(results)
 
     search_results = await asyncio.gather(*(_search(emb) for emb in embeddings))
     return list(search_results)
diff --git a/src/noteflow/infrastructure/ai/tools/synthesis.py b/src/noteflow/infrastructure/ai/tools/synthesis.py
index fbbff52..06abbba 100644
--- a/src/noteflow/infrastructure/ai/tools/synthesis.py
+++ b/src/noteflow/infrastructure/ai/tools/synthesis.py
@@ -20,18 +20,6 @@ class SynthesisResult:
     cited_segment_ids: list[int]
 
 
-SYNTHESIS_PROMPT_TEMPLATE: Final[
-    str
-] = """Answer the question based on the following transcript segments.
-Cite specific segments by their ID when making claims.
-
-Question: {question}
-
-Segments:
-{segments}
-
-Answer (cite segment IDs in brackets like [1], [3]):"""
-
 CITATION_PATTERN: Final[re.Pattern[str]] = re.compile(r"\[(\d+)\]")
 
 
@@ -44,10 +32,7 @@ async def synthesize_answer(
     segment_text = "\n".join(
         f"[{s.segment_id}] ({s.start_time:.1f}s-{s.end_time:.1f}s): {s.text}" for s in segments
     )
-    prompt = SYNTHESIS_PROMPT_TEMPLATE.format(
-        question=question,
-        segments=segment_text,
-    )
+    prompt = _build_prompt(question, segment_text)
     answer = await llm.complete(prompt)
     valid_ids = {s.segment_id for s in segments}
     cited_ids = extract_cited_ids(answer, valid_ids)
@@ -58,3 +43,13 @@ def extract_cited_ids(answer: str, valid_ids: set[int]) -> list[int]:
     matches = CITATION_PATTERN.findall(answer)
     cited = [int(m) for m in matches if int(m) in valid_ids]
     return list(dict.fromkeys(cited))
+
+
+def _build_prompt(question: str, segments: str) -> str:
+    return (
+        "Answer the question based on the following transcript segments.\n"
+        "Cite specific segments by their ID when making claims.\n\n"
+        f"Question: {question}\n\n"
+        f"Segments:\n{segments}\n\n"
+        "Answer (cite segment IDs in brackets like [1], [3]):"
+    )
diff --git a/src/noteflow/infrastructure/converters/integration_converters.py b/src/noteflow/infrastructure/converters/integration_converters.py
index f9b8d08..eebf369 100644
--- a/src/noteflow/infrastructure/converters/integration_converters.py
+++ b/src/noteflow/infrastructure/converters/integration_converters.py
@@ -4,7 +4,7 @@ from __future__ import annotations
 
 from typing import TYPE_CHECKING
 
-from noteflow.domain.constants.fields import DURATION_MS, ENDED_AT, ERROR_CODE
+from noteflow.domain.constants.fields import CONFIG, DURATION_MS, ENDED_AT, ERROR_CODE
 from noteflow.domain.entities.integration import (
     Integration,
     IntegrationStatus,
@@ -47,7 +47,7 @@ class IntegrationConverter:
         )
 
     @staticmethod
-    def to_orm_kwargs(entity: Integration) -> dict[str, object]:
+    def to_integration_orm_kwargs(entity: Integration) -> dict[str, object]:
         """Convert domain entity to ORM model kwargs.
 
         Returns a dict of kwargs rather than instantiating IntegrationModel
@@ -66,7 +66,7 @@ class IntegrationConverter:
             "name": entity.name,
             "type": entity.type.value,
             "status": entity.status.value,
-            "config": entity.config,
+            CONFIG: entity.config,
             "last_sync": entity.last_sync,
             "error_message": entity.error_message,
             "created_at": entity.created_at,
@@ -105,7 +105,7 @@ class SyncRunConverter:
         )
 
     @staticmethod
-    def to_orm_kwargs(entity: SyncRun) -> dict[str, object]:
+    def to_sync_run_orm_kwargs(entity: SyncRun) -> dict[str, object]:
         """Convert domain entity to ORM model kwargs.
 
         Args:
diff --git a/src/noteflow/infrastructure/converters/ner_converters.py b/src/noteflow/infrastructure/converters/ner_converters.py
index dad79ee..4c48adc 100644
--- a/src/noteflow/infrastructure/converters/ner_converters.py
+++ b/src/noteflow/infrastructure/converters/ner_converters.py
@@ -53,7 +53,7 @@ class NerConverter:
         )
 
     @staticmethod
-    def to_orm_kwargs(entity: NamedEntity) -> dict[str, object]:
+    def to_entity_orm_kwargs(entity: NamedEntity) -> dict[str, object]:
         """Convert domain entity to ORM model kwargs.
 
         Returns a dict of kwargs rather than instantiating NamedEntityModel
diff --git a/src/noteflow/infrastructure/metrics/system_resources.py b/src/noteflow/infrastructure/metrics/system_resources.py
index 450e21f..832f072 100644
--- a/src/noteflow/infrastructure/metrics/system_resources.py
+++ b/src/noteflow/infrastructure/metrics/system_resources.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+from collections.abc import Callable
 from dataclasses import dataclass
 from typing import Final, Protocol, cast
 
@@ -17,7 +18,7 @@ class _TorchCudaProperties(Protocol):
 
 
 class _TorchCudaModule(Protocol):
-    def is_available(self) -> bool: ...
+    is_available: Callable[[], bool]
     def mem_get_info(self) -> tuple[int, int]: ...
     def get_device_properties(self, device: int) -> _TorchCudaProperties: ...
     def memory_reserved(self, device: int) -> int: ...
diff --git a/src/noteflow/infrastructure/ner/backends/gliner_backend.py b/src/noteflow/infrastructure/ner/backends/gliner_backend.py
index 37f5b3a..25ff853 100644
--- a/src/noteflow/infrastructure/ner/backends/gliner_backend.py
+++ b/src/noteflow/infrastructure/ner/backends/gliner_backend.py
@@ -6,6 +6,7 @@ from typing import TYPE_CHECKING, Final, TypedDict, cast
 
 from noteflow.domain.entities.named_entity import EntityCategory
 from noteflow.infrastructure.logging import get_logger, log_timing
+from noteflow.infrastructure.ner.constants import LABEL_TIME
 from noteflow.infrastructure.ner.backends.types import RawEntity
 
 if TYPE_CHECKING:
@@ -31,7 +32,7 @@ MEETING_LABELS: Final[tuple[str, ...]] = (
     EntityCategory.PRODUCT.value,
     "app",
     EntityCategory.LOCATION.value,
-    "time",
+    LABEL_TIME,
     EntityCategory.TIME_RELATIVE.value,
     EntityCategory.DURATION.value,
     EntityCategory.EVENT.value,
diff --git a/src/noteflow/infrastructure/ner/constants.py b/src/noteflow/infrastructure/ner/constants.py
new file mode 100644
index 0000000..f38ac38
--- /dev/null
+++ b/src/noteflow/infrastructure/ner/constants.py
@@ -0,0 +1,7 @@
+"""Constants for NER label normalization."""
+
+from __future__ import annotations
+
+from typing import Final
+
+LABEL_TIME: Final[str] = "time"
diff --git a/src/noteflow/infrastructure/ner/mapper.py b/src/noteflow/infrastructure/ner/mapper.py
index e0c32fa..676719e 100644
--- a/src/noteflow/infrastructure/ner/mapper.py
+++ b/src/noteflow/infrastructure/ner/mapper.py
@@ -5,6 +5,7 @@ from __future__ import annotations
 from typing import Final
 
 from noteflow.domain.entities.named_entity import EntityCategory, NamedEntity
+from noteflow.infrastructure.ner.constants import LABEL_TIME
 from noteflow.infrastructure.ner.backends.types import RawEntity
 
 DEFAULT_CONFIDENCE: Final[float] = 0.8
@@ -20,7 +21,7 @@ LABEL_TO_CATEGORY: Final[dict[str, EntityCategory]] = {
     "loc": EntityCategory.LOCATION,
     "fac": EntityCategory.LOCATION,
     EntityCategory.DATE.value: EntityCategory.DATE,
-    "time": EntityCategory.DATE,
+    LABEL_TIME: EntityCategory.DATE,
     EntityCategory.TIME_RELATIVE.value: EntityCategory.TIME_RELATIVE,
     EntityCategory.DURATION.value: EntityCategory.DURATION,
     EntityCategory.EVENT.value: EntityCategory.EVENT,
diff --git a/src/noteflow/infrastructure/ner/post_processing.py b/src/noteflow/infrastructure/ner/post_processing.py
index bd17411..7b9ef63 100644
--- a/src/noteflow/infrastructure/ner/post_processing.py
+++ b/src/noteflow/infrastructure/ner/post_processing.py
@@ -6,6 +6,7 @@ import re
 from typing import Final
 
 from noteflow.domain.constants.fields import DATE
+from noteflow.infrastructure.ner.constants import LABEL_TIME
 from noteflow.infrastructure.ner.backends.types import RawEntity
 
 PROFANITY_WORDS: Final[frozenset[str]] = frozenset(
@@ -41,7 +42,7 @@ DURATION_UNITS: Final[frozenset[str]] = frozenset(
 
 TIME_LABELS: Final[frozenset[str]] = frozenset(
     {
-        "time",
+        LABEL_TIME,
         "time_relative",
         DATE,
     }
diff --git a/src/noteflow/infrastructure/persistence/repositories/_materialized_view_queries.py b/src/noteflow/infrastructure/persistence/repositories/_materialized_view_queries.py
index 2ef6bfb..6054f92 100644
--- a/src/noteflow/infrastructure/persistence/repositories/_materialized_view_queries.py
+++ b/src/noteflow/infrastructure/persistence/repositories/_materialized_view_queries.py
@@ -42,19 +42,29 @@ MaterializedViewName = Literal[
     "mv_entity_totals",
 ]
 
+# Canonical view name constants
+MV_DAILY_MEETING_STATS: Final[MaterializedViewName] = "mv_daily_meeting_stats"
+MV_SPEAKER_STATS: Final[MaterializedViewName] = "mv_speaker_stats"
+MV_ENTITY_CATEGORY_STATS: Final[MaterializedViewName] = "mv_entity_category_stats"
+MV_TOP_ENTITIES: Final[MaterializedViewName] = "mv_top_entities"
+MV_MEETING_TOTALS: Final[MaterializedViewName] = "mv_meeting_totals"
+MV_ENTITY_TOTALS: Final[MaterializedViewName] = "mv_entity_totals"
+
 # Frozen set for runtime validation
 VALID_VIEW_NAMES: Final[frozenset[str]] = frozenset(get_args(MaterializedViewName))
 
 # Ordered list of all materialized views
 ALL_MATERIALIZED_VIEWS: Final[tuple[MaterializedViewName, ...]] = (
-    "mv_daily_meeting_stats",
-    "mv_speaker_stats",
-    "mv_entity_category_stats",
-    "mv_top_entities",
-    "mv_meeting_totals",
-    "mv_entity_totals",
+    MV_DAILY_MEETING_STATS,
+    MV_SPEAKER_STATS,
+    MV_ENTITY_CATEGORY_STATS,
+    MV_TOP_ENTITIES,
+    MV_MEETING_TOTALS,
+    MV_ENTITY_TOTALS,
 )
 
+SQL_AND: Final[str] = " AND "
+
 
 class DailyStatsMVRow(Protocol):
     meeting_date: date
@@ -174,7 +184,7 @@ async def fetch_daily_stats_mv(
     conditions, query_params = _build_daily_params(
         params.workspace_id, params.project_ids, params.start_time, params.end_time
     )
-    where_clause = " AND ".join(conditions)
+    where_clause = SQL_AND.join(conditions)
     query = text(f"""
         SELECT 
             meeting_date,
@@ -199,7 +209,7 @@ async def fetch_meeting_totals_mv(
         return None
 
     conditions, query_params = _build_workspace_params(params.workspace_id, params.project_ids)
-    where_clause = " AND ".join(conditions)
+    where_clause = SQL_AND.join(conditions)
     query = text(f"""
         SELECT 
             SUM(total_meetings)::integer as total_meetings,
@@ -226,7 +236,7 @@ async def fetch_speaker_stats_mv(
         return None
 
     conditions, query_params = _build_workspace_params(params.workspace_id, params.project_ids)
-    where_clause = " AND ".join(conditions)
+    where_clause = SQL_AND.join(conditions)
     query = text(f"""
         SELECT 
             speaker_id,
@@ -252,7 +262,7 @@ async def fetch_entity_category_mv(
         return None
 
     conditions, query_params = _build_workspace_params(params.workspace_id, params.project_ids)
-    where_clause = " AND ".join(conditions)
+    where_clause = SQL_AND.join(conditions)
     query = text(f"""
         SELECT 
             category,
@@ -279,7 +289,7 @@ async def fetch_top_entities_mv(
 
     conditions, query_params = _build_workspace_params(params.workspace_id, params.project_ids)
     query_params["limit"] = limit
-    where_clause = " AND ".join(conditions)
+    where_clause = SQL_AND.join(conditions)
     query = text(f"""
         SELECT 
             text,
@@ -305,7 +315,7 @@ async def fetch_entity_totals_mv(
         return None
 
     conditions, query_params = _build_workspace_params(params.workspace_id, params.project_ids)
-    where_clause = " AND ".join(conditions)
+    where_clause = SQL_AND.join(conditions)
     query = text(f"""
         SELECT 
             SUM(total_entities)::integer as total_entities,
diff --git a/src/noteflow/infrastructure/persistence/repositories/analytics_repo.py b/src/noteflow/infrastructure/persistence/repositories/analytics_repo.py
index 16486bf..6862a5d 100644
--- a/src/noteflow/infrastructure/persistence/repositories/analytics_repo.py
+++ b/src/noteflow/infrastructure/persistence/repositories/analytics_repo.py
@@ -45,6 +45,12 @@ from noteflow.infrastructure.persistence.repositories._analytics_converters impo
     top_entity_from_row,
 )
 from noteflow.infrastructure.persistence.repositories._materialized_view_queries import (
+    MV_DAILY_MEETING_STATS,
+    MV_ENTITY_CATEGORY_STATS,
+    MV_ENTITY_TOTALS,
+    MV_MEETING_TOTALS,
+    MV_SPEAKER_STATS,
+    MV_TOP_ENTITIES,
     fetch_daily_stats_mv,
     fetch_entity_category_mv,
     fetch_entity_totals_mv,
@@ -61,6 +67,8 @@ logger = get_logger(__name__)
 
 class SqlAlchemyAnalyticsRepository(BaseRepository):
     _mv_available: bool | None = None
+    _ANALYTICS_MV_HIT = "analytics_mv_hit"
+    _ANALYTICS_MV_FALLBACK = "analytics_mv_fallback"
 
     @classmethod
     def reset_mv_cache(cls) -> None:
@@ -81,14 +89,14 @@ class SqlAlchemyAnalyticsRepository(BaseRepository):
         await refresh_all_materialized_views(self._session)
 
     async def refresh_meeting_views(self) -> None:
-        await refresh_materialized_view(self._session, "mv_daily_meeting_stats")
-        await refresh_materialized_view(self._session, "mv_meeting_totals")
-        await refresh_materialized_view(self._session, "mv_speaker_stats")
+        await refresh_materialized_view(self._session, MV_DAILY_MEETING_STATS)
+        await refresh_materialized_view(self._session, MV_MEETING_TOTALS)
+        await refresh_materialized_view(self._session, MV_SPEAKER_STATS)
 
     async def refresh_entity_views(self) -> None:
-        await refresh_materialized_view(self._session, "mv_entity_category_stats")
-        await refresh_materialized_view(self._session, "mv_top_entities")
-        await refresh_materialized_view(self._session, "mv_entity_totals")
+        await refresh_materialized_view(self._session, MV_ENTITY_CATEGORY_STATS)
+        await refresh_materialized_view(self._session, MV_TOP_ENTITIES)
+        await refresh_materialized_view(self._session, MV_ENTITY_TOTALS)
 
     async def get_overview(
         self,
@@ -201,9 +209,9 @@ class SqlAlchemyAnalyticsRepository(BaseRepository):
             )
             mv_result = await self._get_overview_from_mv(params)
             if mv_result is not None:
-                logger.debug("analytics_mv_hit", method="get_overview")
+                logger.debug(self._ANALYTICS_MV_HIT, method="get_overview")
                 return mv_result
-            logger.debug("analytics_mv_fallback", method="get_overview")
+            logger.debug(self._ANALYTICS_MV_FALLBACK, method="get_overview")
 
         return await self.get_overview(workspace_id, project_ids, start_time, end_time)
 
@@ -243,9 +251,9 @@ class SqlAlchemyAnalyticsRepository(BaseRepository):
             )
             mv_result = await fetch_speaker_stats_mv(self._session, params)
             if mv_result is not None:
-                logger.debug("analytics_mv_hit", method="get_speaker_stats")
+                logger.debug(self._ANALYTICS_MV_HIT, method="get_speaker_stats")
                 return [speaker_stat_from_mv(r) for r in mv_result]
-            logger.debug("analytics_mv_fallback", method="get_speaker_stats")
+            logger.debug(self._ANALYTICS_MV_FALLBACK, method="get_speaker_stats")
 
         return await self.get_speaker_stats(workspace_id, project_ids, start_time, end_time)
 
@@ -264,9 +272,9 @@ class SqlAlchemyAnalyticsRepository(BaseRepository):
                 base_params, top_limit=params.top_limit
             )
             if mv_result is not None:
-                logger.debug("analytics_mv_hit", method="get_entity_analytics")
+                logger.debug(self._ANALYTICS_MV_HIT, method="get_entity_analytics")
                 return mv_result
-            logger.debug("analytics_mv_fallback", method="get_entity_analytics")
+            logger.debug(self._ANALYTICS_MV_FALLBACK, method="get_entity_analytics")
 
         return await self.get_entity_analytics(params)
 
diff --git a/src/noteflow/infrastructure/persistence/repositories/entity_repo.py b/src/noteflow/infrastructure/persistence/repositories/entity_repo.py
index 439c204..d41e3ae 100644
--- a/src/noteflow/infrastructure/persistence/repositories/entity_repo.py
+++ b/src/noteflow/infrastructure/persistence/repositories/entity_repo.py
@@ -62,7 +62,7 @@ class SqlAlchemyEntityRepository(
         Returns:
             Saved entity with db_id populated.
         """
-        kwargs = NerConverter.to_orm_kwargs(entity)
+        kwargs = NerConverter.to_entity_orm_kwargs(entity)
         stmt = insert(NamedEntityModel).values(**kwargs)
         excluded = stmt.excluded
         stmt = stmt.on_conflict_do_update(
@@ -103,7 +103,7 @@ class SqlAlchemyEntityRepository(
         if not entities:
             return entities
 
-        payload = [NerConverter.to_orm_kwargs(entity) for entity in entities]
+        payload = [NerConverter.to_entity_orm_kwargs(entity) for entity in entities]
         stmt = insert(NamedEntityModel).values(payload)
         excluded = stmt.excluded
         stmt = stmt.on_conflict_do_update(
diff --git a/src/noteflow/infrastructure/persistence/repositories/integration/integration_repo.py b/src/noteflow/infrastructure/persistence/repositories/integration/integration_repo.py
index 144e517..2e3e8b1 100644
--- a/src/noteflow/infrastructure/persistence/repositories/integration/integration_repo.py
+++ b/src/noteflow/infrastructure/persistence/repositories/integration/integration_repo.py
@@ -90,7 +90,7 @@ class SqlAlchemyIntegrationRepository(
         Returns:
             Created integration.
         """
-        kwargs = IntegrationConverter.to_orm_kwargs(integration)
+        kwargs = IntegrationConverter.to_integration_orm_kwargs(integration)
         model = IntegrationModel(**kwargs)
         await self._add_and_flush(model)
         logger.info(
@@ -207,7 +207,7 @@ class SqlAlchemyIntegrationRepository(
         Returns:
             Created sync run.
         """
-        kwargs = SyncRunConverter.to_orm_kwargs(sync_run)
+        kwargs = SyncRunConverter.to_sync_run_orm_kwargs(sync_run)
         model = IntegrationSyncRunModel(**kwargs)
         await self._add_and_flush(model)
         logger.info(
diff --git a/src/noteflow/infrastructure/persistence/repositories/usage_event/_aggregations.py b/src/noteflow/infrastructure/persistence/repositories/usage_event/_aggregations.py
index 310fc4c..dcd4d24 100644
--- a/src/noteflow/infrastructure/persistence/repositories/usage_event/_aggregations.py
+++ b/src/noteflow/infrastructure/persistence/repositories/usage_event/_aggregations.py
@@ -12,7 +12,7 @@ from sqlalchemy import func, select
 from sqlalchemy.engine import RowMapping
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from noteflow.domain.constants.fields import MODEL_NAME
+from noteflow.domain.constants.fields import COUNT, MODEL_NAME
 from noteflow.infrastructure.persistence.models.observability.usage_event import (
     UsageEventModel,
 )
@@ -182,7 +182,7 @@ async def count_by_event_type(
     stmt = (
         select(
             UsageEventModel.event_type,
-            func.count(UsageEventModel.id).label("count"),
+            func.count(UsageEventModel.id).label(COUNT),
         )
         .where(
             UsageEventModel.timestamp >= start_time,
@@ -193,4 +193,4 @@ async def count_by_event_type(
 
     result = await session.execute(stmt)
     rows: Sequence[RowMapping] = result.mappings().all()
-    return {str(row["event_type"]): int(row["count"]) for row in rows}
+    return {str(row["event_type"]): int(row[COUNT]) for row in rows}
diff --git a/src/noteflow/infrastructure/summarization/_action_items.py b/src/noteflow/infrastructure/summarization/_action_items.py
index 352482f..54ee58f 100644
--- a/src/noteflow/infrastructure/summarization/_action_items.py
+++ b/src/noteflow/infrastructure/summarization/_action_items.py
@@ -5,11 +5,12 @@ from __future__ import annotations
 from collections.abc import Sequence
 from typing import Final
 
+from noteflow.domain.constants.fields import ACTION
 from noteflow.domain.entities import ActionItem, Segment
 
 _ACTION_KEYWORDS: Final[tuple[str, ...]] = (
     "todo",
-    "action",
+    ACTION,
     "will",
     "should",
     "must",
diff --git a/src/noteflow/infrastructure/summarization/template_renderer.py b/src/noteflow/infrastructure/summarization/template_renderer.py
index 510b8db..f08bb88 100644
--- a/src/noteflow/infrastructure/summarization/template_renderer.py
+++ b/src/noteflow/infrastructure/summarization/template_renderer.py
@@ -8,7 +8,7 @@ from dataclasses import dataclass, field
 from datetime import datetime
 from typing import TypeVar
 
-from noteflow.domain.constants.fields import DISPLAY_NAME, ENDED_AT, STATE
+from noteflow.domain.constants.fields import DISPLAY_NAME, EMAIL, ENDED_AT, STATE
 from noteflow.domain.constants.placeholders import STYLE_INSTRUCTIONS_PLACEHOLDER
 
 
@@ -110,7 +110,7 @@ WORKSPACE_GETTERS: dict[str, Callable[[WorkspaceTemplateContext], str | None]] =
 
 USER_GETTERS: dict[str, Callable[[UserTemplateContext], str | None]] = {
     DISPLAY_NAME: lambda ctx: ctx.display_name,
-    "email": lambda ctx: ctx.email,
+    EMAIL: lambda ctx: ctx.email,
 }
 
 SUMMARY_GETTERS: dict[str, Callable[[SummaryTemplateContext], str | None]] = {
diff --git a/tests/domain/ai/test_citations.py b/tests/domain/ai/test_citations.py
index 659e597..249e9d5 100644
--- a/tests/domain/ai/test_citations.py
+++ b/tests/domain/ai/test_citations.py
@@ -4,6 +4,9 @@ import pytest
 
 from noteflow.domain.ai.citations import SegmentCitation
 
+EXPECTED_DURATION_SECONDS = 15.0
+FROZEN_ASSIGNMENT_MESSAGE = "cannot assign to field"
+
 
 class TestSegmentCitation:
     def test_creation_with_valid_values(self) -> None:
@@ -17,14 +20,14 @@ class TestSegmentCitation:
             score=0.95,
         )
 
-        assert citation.meeting_id == meeting_id
-        assert citation.segment_id == 1
-        assert citation.start_time == 0.0
-        assert citation.end_time == 5.0
-        assert citation.text == "Test segment text"
-        assert citation.score == 0.95
+        assert citation.meeting_id == meeting_id, "Meeting ID should be preserved"
+        assert citation.segment_id == 1, "Segment ID should be preserved"
+        assert citation.start_time == 0.0, "Start time should be preserved"
+        assert citation.end_time == 5.0, "End time should be preserved"
+        assert citation.text == "Test segment text", "Text should be preserved"
+        assert citation.score == 0.95, "Score should be preserved"
 
-    def test_duration_property(self) -> None:
+    def test_duration_property_returns_delta(self) -> None:
         citation = SegmentCitation(
             meeting_id=uuid4(),
             segment_id=1,
@@ -33,7 +36,9 @@ class TestSegmentCitation:
             text="Test",
         )
 
-        assert citation.duration == 15.0
+        assert citation.duration == EXPECTED_DURATION_SECONDS, (
+            "Duration should equal end_time - start_time"
+        )
 
     def test_default_score_is_zero(self) -> None:
         citation = SegmentCitation(
@@ -44,7 +49,7 @@ class TestSegmentCitation:
             text="Test",
         )
 
-        assert citation.score == 0.0
+        assert citation.score == 0.0, "Default score should be zero"
 
     def test_rejects_negative_segment_id(self) -> None:
         with pytest.raises(ValueError, match="segment_id must be non-negative"):
@@ -103,9 +108,9 @@ class TestSegmentCitation:
             text="Instant moment",
         )
 
-        assert citation.duration == 0.0
+        assert citation.duration == 0.0, "Zero-length segments should have zero duration"
 
-    def test_is_frozen(self) -> None:
+    def test_citation_is_frozen(self) -> None:
         citation = SegmentCitation(
             meeting_id=uuid4(),
             segment_id=1,
@@ -114,5 +119,5 @@ class TestSegmentCitation:
             text="Test",
         )
 
-        with pytest.raises(AttributeError):
-            citation.text = "Modified"  # type: ignore[misc]
+        with pytest.raises(AttributeError, match=FROZEN_ASSIGNMENT_MESSAGE):
+            setattr(citation, "text", "Modified")
diff --git a/tests/infrastructure/ai/test_retrieval.py b/tests/infrastructure/ai/test_retrieval.py
index 6cbc881..8dd3007 100644
--- a/tests/infrastructure/ai/test_retrieval.py
+++ b/tests/infrastructure/ai/test_retrieval.py
@@ -1,12 +1,17 @@
-from collections.abc import Sequence
+from collections.abc import Awaitable, Callable, Sequence
 from dataclasses import dataclass
+from typing import cast
 from unittest.mock import AsyncMock
 from uuid import uuid4
 
 import pytest
 
+from noteflow.domain.value_objects import MeetingId
 from noteflow.infrastructure.ai.tools.retrieval import (
     BatchEmbedderProtocol,
+    MeetingBatchRetrievalRequest,
+    MeetingRetrievalDependencies,
+    MeetingRetrievalRequest,
     RetrievalResult,
     retrieve_segments,
     retrieve_segments_batch,
@@ -34,14 +39,24 @@ class TestRetrieveSegments:
         return AsyncMock()
 
     @pytest.fixture
-    def sample_meeting_id(self) -> object:
-        return uuid4()
+    def sample_meeting_id(self) -> MeetingId:
+        return MeetingId(uuid4())
 
-    async def test_retrieve_segments_success(
+    @pytest.fixture
+    def deps(
         self,
         mock_embedder: AsyncMock,
         mock_segment_repo: AsyncMock,
-        sample_meeting_id: object,
+    ) -> MeetingRetrievalDependencies:
+        return MeetingRetrievalDependencies(
+            embedder=mock_embedder,
+            segment_repo=mock_segment_repo,
+        )
+
+    async def test_retrieve_segments_success(
+        self,
+        deps: MeetingRetrievalDependencies,
+        sample_meeting_id: MeetingId,
     ) -> None:
         segment = MockSegment(
             segment_id=1,
@@ -50,52 +65,50 @@ class TestRetrieveSegments:
             start_time=0.0,
             end_time=5.0,
         )
-        mock_segment_repo.search_semantic.return_value = [(segment, 0.95)]
+        deps.segment_repo.search_semantic.return_value = [(segment, 0.95)]
 
         results = await retrieve_segments(
-            query="test query",
-            embedder=mock_embedder,
-            segment_repo=mock_segment_repo,
-            meeting_id=sample_meeting_id,  # type: ignore[arg-type]
-            top_k=5,
+            MeetingRetrievalRequest(
+                query="test query",
+                meeting_id=sample_meeting_id,
+                top_k=5,
+            ),
+            deps,
         )
 
-        assert len(results) == 1
-        assert results[0].segment_id == 1
-        assert results[0].text == "Test segment"
-        assert results[0].score == 0.95
+        assert len(results) == 1, "Expected one retrieval result"
+        assert results[0].segment_id == 1, "Segment ID should match input"
+        assert results[0].text == "Test segment", "Segment text should match input"
+        assert results[0].score == 0.95, "Score should preserve search score"
 
     async def test_retrieve_segments_calls_embedder_with_query(
         self,
-        mock_embedder: AsyncMock,
-        mock_segment_repo: AsyncMock,
+        deps: MeetingRetrievalDependencies,
     ) -> None:
-        mock_segment_repo.search_semantic.return_value = []
+        deps.segment_repo.search_semantic.return_value = []
 
         await retrieve_segments(
-            query="what happened in the meeting",
-            embedder=mock_embedder,
-            segment_repo=mock_segment_repo,
+            MeetingRetrievalRequest(query="what happened in the meeting"),
+            deps,
         )
 
-        mock_embedder.embed.assert_called_once_with("what happened in the meeting")
+        embed_call = cast(AsyncMock, deps.embedder.embed)
+        embed_call.assert_called_once_with("what happened in the meeting")
 
     async def test_retrieve_segments_passes_embedding_to_repo(
         self,
-        mock_embedder: AsyncMock,
-        mock_segment_repo: AsyncMock,
+        deps: MeetingRetrievalDependencies,
     ) -> None:
-        mock_embedder.embed.return_value = [1.0, 2.0, 3.0]
-        mock_segment_repo.search_semantic.return_value = []
+        deps.embedder.embed.return_value = [1.0, 2.0, 3.0]
+        deps.segment_repo.search_semantic.return_value = []
 
         await retrieve_segments(
-            query="test",
-            embedder=mock_embedder,
-            segment_repo=mock_segment_repo,
-            top_k=10,
+            MeetingRetrievalRequest(query="test", top_k=10),
+            deps,
         )
 
-        mock_segment_repo.search_semantic.assert_called_once_with(
+        search_call = cast(AsyncMock, deps.segment_repo.search_semantic)
+        search_call.assert_called_once_with(
             query_embedding=[1.0, 2.0, 3.0],
             meeting_id=None,
             limit=10,
@@ -103,18 +116,16 @@ class TestRetrieveSegments:
 
     async def test_retrieve_segments_empty_result(
         self,
-        mock_embedder: AsyncMock,
-        mock_segment_repo: AsyncMock,
+        deps: MeetingRetrievalDependencies,
     ) -> None:
-        mock_segment_repo.search_semantic.return_value = []
+        deps.segment_repo.search_semantic.return_value = []
 
         results = await retrieve_segments(
-            query="test",
-            embedder=mock_embedder,
-            segment_repo=mock_segment_repo,
+            MeetingRetrievalRequest(query="test"),
+            deps,
         )
 
-        assert results == []
+        assert results == [], "Expected no results for empty search response"
 
     async def test_retrieval_result_is_frozen(self) -> None:
         result = RetrievalResult(
@@ -126,8 +137,8 @@ class TestRetrieveSegments:
             score=0.9,
         )
 
-        with pytest.raises(AttributeError):
-            result.text = "Modified"  # type: ignore[misc]
+        with pytest.raises(AttributeError, match="cannot assign to field"):
+            setattr(result, "text", "Modified")
 
 
 class MockBatchEmbedder:
@@ -145,6 +156,24 @@ class MockBatchEmbedder:
         return [self._embedding for _ in texts]
 
 
+def _ordered_search_side_effect(
+    first: MockSegment,
+    second: MockSegment,
+) -> Callable[[list[float], int, object], Awaitable[list[tuple[MockSegment, float]]]]:
+    call_count = 0
+
+    async def side_effect(
+        query_embedding: list[float],
+        limit: int,
+        meeting_id: object,
+    ) -> list[tuple[MockSegment, float]]:
+        nonlocal call_count
+        call_count += 1
+        return [(first, 0.9)] if call_count == 1 else [(second, 0.8)]
+
+    return side_effect
+
+
 class TestRetrieveSegmentsBatch:
     @pytest.fixture
     def mock_embedder(self) -> AsyncMock:
@@ -161,8 +190,8 @@ class TestRetrieveSegmentsBatch:
         return AsyncMock()
 
     @pytest.fixture
-    def sample_meeting_id(self) -> object:
-        return uuid4()
+    def sample_meeting_id(self) -> MeetingId:
+        return MeetingId(uuid4())
 
     async def test_batch_returns_empty_for_no_queries(
         self,
@@ -170,19 +199,21 @@ class TestRetrieveSegmentsBatch:
         mock_segment_repo: AsyncMock,
     ) -> None:
         results = await retrieve_segments_batch(
-            queries=[],
-            embedder=mock_embedder,
-            segment_repo=mock_segment_repo,
+            MeetingBatchRetrievalRequest(queries=[]),
+            MeetingRetrievalDependencies(
+                embedder=mock_embedder,
+                segment_repo=mock_segment_repo,
+            ),
         )
 
-        assert results == []
+        assert results == [], "Expected empty results for empty query list"
         mock_embedder.embed.assert_not_called()
 
     async def test_batch_uses_embed_batch_when_available(
         self,
         batch_embedder: MockBatchEmbedder,
         mock_segment_repo: AsyncMock,
-        sample_meeting_id: object,
+        sample_meeting_id: MeetingId,
     ) -> None:
         segment = MockSegment(
             segment_id=1,
@@ -196,22 +227,28 @@ class TestRetrieveSegmentsBatch:
         assert isinstance(batch_embedder, BatchEmbedderProtocol)
 
         results = await retrieve_segments_batch(
-            queries=["query1", "query2"],
-            embedder=batch_embedder,
-            segment_repo=mock_segment_repo,
-            meeting_id=sample_meeting_id,  # type: ignore[arg-type]
+            MeetingBatchRetrievalRequest(
+                queries=["query1", "query2"],
+                meeting_id=sample_meeting_id,
+            ),
+            MeetingRetrievalDependencies(
+                embedder=batch_embedder,
+                segment_repo=mock_segment_repo,
+            ),
         )
 
-        assert len(results) == 2
-        assert len(batch_embedder.embed_batch_calls) == 1
-        assert list(batch_embedder.embed_batch_calls[0]) == ["query1", "query2"]
-        assert batch_embedder.embed_calls == []
+        assert len(results) == 2, "Expected one result list per query"
+        assert len(batch_embedder.embed_batch_calls) == 1, "Expected batch embedding call"
+        assert list(batch_embedder.embed_batch_calls[0]) == ["query1", "query2"], (
+            "Batch embedder should receive queries in order"
+        )
+        assert batch_embedder.embed_calls == [], "Single embed should not be used"
 
     async def test_batch_falls_back_to_parallel_embed(
         self,
         mock_embedder: AsyncMock,
         mock_segment_repo: AsyncMock,
-        sample_meeting_id: object,
+        sample_meeting_id: MeetingId,
     ) -> None:
         segment = MockSegment(
             segment_id=1,
@@ -223,46 +260,43 @@ class TestRetrieveSegmentsBatch:
         mock_segment_repo.search_semantic.return_value = [(segment, 0.9)]
 
         results = await retrieve_segments_batch(
-            queries=["query1", "query2"],
-            embedder=mock_embedder,
-            segment_repo=mock_segment_repo,
-            meeting_id=sample_meeting_id,  # type: ignore[arg-type]
+            MeetingBatchRetrievalRequest(
+                queries=["query1", "query2"],
+                meeting_id=sample_meeting_id,
+            ),
+            MeetingRetrievalDependencies(
+                embedder=mock_embedder,
+                segment_repo=mock_segment_repo,
+            ),
         )
 
-        assert len(results) == 2
-        assert mock_embedder.embed.call_count == 2
+        assert len(results) == 2, "Expected one result list per query"
+        assert mock_embedder.embed.call_count == 2, "Expected parallel embed fallback"
 
     async def test_batch_preserves_query_order(
         self,
         mock_segment_repo: AsyncMock,
-        sample_meeting_id: object,
+        sample_meeting_id: MeetingId,
     ) -> None:
         segment1 = MockSegment(1, sample_meeting_id, "First", 0.0, 5.0)
         segment2 = MockSegment(2, sample_meeting_id, "Second", 5.0, 10.0)
-
-        call_count = 0
-
-        async def side_effect(
-            query_embedding: list[float],
-            limit: int,
-            meeting_id: object,
-        ) -> list[tuple[MockSegment, float]]:
-            nonlocal call_count
-            call_count += 1
-            if call_count == 1:
-                return [(segment1, 0.9)]
-            return [(segment2, 0.8)]
-
-        mock_segment_repo.search_semantic.side_effect = side_effect
+        mock_segment_repo.search_semantic.side_effect = _ordered_search_side_effect(
+            segment1,
+            segment2,
+        )
 
         embedder = MockBatchEmbedder([0.1, 0.2])
         results = await retrieve_segments_batch(
-            queries=["first", "second"],
-            embedder=embedder,
-            segment_repo=mock_segment_repo,
-            meeting_id=sample_meeting_id,  # type: ignore[arg-type]
+            MeetingBatchRetrievalRequest(
+                queries=["first", "second"],
+                meeting_id=sample_meeting_id,
+            ),
+            MeetingRetrievalDependencies(
+                embedder=embedder,
+                segment_repo=mock_segment_repo,
+            ),
         )
 
-        assert len(results) == 2
-        assert results[0][0].text == "First"
-        assert results[1][0].text == "Second"
+        assert len(results) == 2, "Expected results for two queries"
+        assert results[0][0].text == "First", "First query should map to first result"
+        assert results[1][0].text == "Second", "Second query should map to second result"
diff --git a/tests/infrastructure/ai/test_synthesis.py b/tests/infrastructure/ai/test_synthesis.py
index 56e20ee..ebc24ff 100644
--- a/tests/infrastructure/ai/test_synthesis.py
+++ b/tests/infrastructure/ai/test_synthesis.py
@@ -11,6 +11,10 @@ from noteflow.infrastructure.ai.tools.synthesis import (
 )
 
 
+INVALID_CITATION_ID = 99
+FROZEN_ASSIGNMENT_MESSAGE = "cannot assign to field"
+
+
 class TestSynthesizeAnswer:
     @pytest.fixture
     def mock_llm(self) -> AsyncMock:
@@ -51,8 +55,8 @@ class TestSynthesizeAnswer:
             llm=mock_llm,
         )
 
-        assert isinstance(result, SynthesisResult)
-        assert "deadline" in result.answer.lower()
+        assert isinstance(result, SynthesisResult), "Result should be a SynthesisResult"
+        assert "deadline" in result.answer.lower(), "Answer should mention the deadline"
 
     async def test_synthesize_answer_extracts_citations(
         self,
@@ -67,14 +71,14 @@ class TestSynthesizeAnswer:
             llm=mock_llm,
         )
 
-        assert result.cited_segment_ids == [1, 3]
+        assert result.cited_segment_ids == [1, 3], "Citations should match referenced segments"
 
     async def test_synthesize_answer_filters_invalid_citations(
         self,
         mock_llm: AsyncMock,
         sample_segments: list[RetrievalResult],
     ) -> None:
-        mock_llm.complete.return_value = "Found [1], [99], and [3]."
+        mock_llm.complete.return_value = f"Found [1], [{INVALID_CITATION_ID}], and [3]."
 
         result = await synthesize_answer(
             question="What happened?",
@@ -82,8 +86,10 @@ class TestSynthesizeAnswer:
             llm=mock_llm,
         )
 
-        assert 99 not in result.cited_segment_ids
-        assert result.cited_segment_ids == [1, 3]
+        assert INVALID_CITATION_ID not in result.cited_segment_ids, (
+            "Invalid citations should be filtered out"
+        )
+        assert result.cited_segment_ids == [1, 3], "Valid citations should be preserved"
 
     async def test_synthesize_answer_builds_prompt_with_segments(
         self,
@@ -100,42 +106,45 @@ class TestSynthesizeAnswer:
 
         call_args = mock_llm.complete.call_args
         prompt = call_args[0][0]
-        assert "What is happening?" in prompt
-        assert "[1]" in prompt
-        assert "[3]" in prompt
-        assert "John discussed" in prompt
+        assert "What is happening?" in prompt, "Prompt should include the question"
+        assert "[1]" in prompt, "Prompt should include citation marker for segment 1"
+        assert "[3]" in prompt, "Prompt should include citation marker for segment 3"
+        assert "John discussed" in prompt, "Prompt should include segment text"
 
 
 class TestExtractCitedIds:
     def test_extracts_single_citation(self) -> None:
         result = extract_cited_ids("The answer is here [5].", {1, 3, 5})
 
-        assert result == [5]
+        assert result == [5], "Single citation should be extracted"
 
     def test_extracts_multiple_citations(self) -> None:
         result = extract_cited_ids("See [1] and [3] for details.", {1, 3, 5})
 
-        assert result == [1, 3]
+        assert result == [1, 3], "Multiple citations should be extracted"
 
     def test_filters_invalid_ids(self) -> None:
-        result = extract_cited_ids("See [1] and [99].", {1, 3, 5})
+        result = extract_cited_ids(
+            f"See [1] and [{INVALID_CITATION_ID}].",
+            {1, 3, 5},
+        )
 
-        assert result == [1]
+        assert result == [1], "Invalid IDs should be filtered out"
 
     def test_deduplicates_citations(self) -> None:
         result = extract_cited_ids("See [1] and then [1] again.", {1, 3})
 
-        assert result == [1]
+        assert result == [1], "Duplicates should be removed while preserving order"
 
     def test_preserves_order(self) -> None:
         result = extract_cited_ids("[3] comes first, then [1].", {1, 3})
 
-        assert result == [3, 1]
+        assert result == [3, 1], "Order should be preserved"
 
     def test_empty_for_no_citations(self) -> None:
         result = extract_cited_ids("No citations here.", {1, 3})
 
-        assert result == []
+        assert result == [], "No citations should return an empty list"
 
 
 class TestSynthesisResult:
@@ -145,5 +154,5 @@ class TestSynthesisResult:
             cited_segment_ids=[1, 2],
         )
 
-        with pytest.raises(AttributeError):
-            result.answer = "Modified"  # type: ignore[misc]
+        with pytest.raises(AttributeError, match=FROZEN_ASSIGNMENT_MESSAGE):
+            setattr(result, "answer", "Modified")
diff --git a/tests/infrastructure/test_converters.py b/tests/infrastructure/test_converters.py
index c5c85d1..9fe3d32 100644
--- a/tests/infrastructure/test_converters.py
+++ b/tests/infrastructure/test_converters.py
@@ -149,8 +149,8 @@ class TestOrmConverterToOrmKwargs:
         assert result["word_index"] == 5, "Word index preserved"
 
 
-class TestNerConverterToOrmKwargs:
-    """Tests for NerConverter.to_orm_kwargs."""
+class TestNerConverterToEntityOrmKwargs:
+    """Tests for NerConverter.to_entity_orm_kwargs."""
 
     def test_ner_entity_to_orm_kwargs(self) -> None:
         """Convert domain NamedEntity to ORM kwargs dict."""
@@ -166,7 +166,7 @@ class TestNerConverterToOrmKwargs:
             is_pinned=True,
         )
 
-        result = NerConverter.to_orm_kwargs(entity)
+        result = NerConverter.to_entity_orm_kwargs(entity)
 
         assert result["id"] == entity.id, "ID should be preserved"
         assert result["meeting_id"] == meeting_id, "Meeting ID should be preserved"
@@ -185,7 +185,7 @@ class TestNerConverterToOrmKwargs:
             confidence=0.8,
         )
 
-        result = NerConverter.to_orm_kwargs(entity)
+        result = NerConverter.to_entity_orm_kwargs(entity)
 
         assert result["category"] == "person", "category value should be 'person'"
         assert isinstance(result["category"], str), "category should be string type"
@@ -206,7 +206,7 @@ class TestNerConverterToOrmKwargs:
     ) -> None:
         """All category enum values convert to correct string."""
         entity = NamedEntity(text="Test", category=category, confidence=0.5)
-        result = NerConverter.to_orm_kwargs(entity)
+        result = NerConverter.to_entity_orm_kwargs(entity)
         assert result["category"] == expected_value, f"category {category} should convert to '{expected_value}'"
 
 
@@ -287,7 +287,7 @@ class TestNerConverterRoundTrip:
         self, round_trip_entity: NamedEntity
     ) -> None:
         """Round-trip conversion preserves all field values."""
-        orm_kwargs = NerConverter.to_orm_kwargs(round_trip_entity)
+        orm_kwargs = NerConverter.to_entity_orm_kwargs(round_trip_entity)
         mock_orm = _create_mock_ner_orm_from_kwargs(orm_kwargs)
         result = NerConverter.orm_to_domain(mock_orm)
 
diff --git a/tests/infrastructure/test_integration_converters.py b/tests/infrastructure/test_integration_converters.py
index 3b53c94..05f0929 100644
--- a/tests/infrastructure/test_integration_converters.py
+++ b/tests/infrastructure/test_integration_converters.py
@@ -177,7 +177,7 @@ class TestIntegrationConverterOrmToDomain:
 
 
 class TestIntegrationConverterToOrmKwargs:
-    """Tests for IntegrationConverter.to_orm_kwargs."""
+    """Tests for IntegrationConverter.to_integration_orm_kwargs."""
 
     @pytest.fixture
     def integration_entity(self) -> Integration:
@@ -199,7 +199,7 @@ class TestIntegrationConverterToOrmKwargs:
         self, integration_entity: Integration
     ) -> None:
         """Convert domain Integration to ORM kwargs dict."""
-        result = IntegrationConverter.to_orm_kwargs(integration_entity)
+        result = IntegrationConverter.to_integration_orm_kwargs(integration_entity)
 
         assert result["id"] == integration_entity.id, "ID should be preserved"
         assert result["workspace_id"] == integration_entity.workspace_id, "Workspace ID should be preserved"
@@ -230,7 +230,7 @@ class TestIntegrationConverterToOrmKwargs:
             type=type_enum,
             status=IntegrationStatus.DISCONNECTED,
         )
-        result = IntegrationConverter.to_orm_kwargs(integration)
+        result = IntegrationConverter.to_integration_orm_kwargs(integration)
         assert result["type"] == expected_string, f"Type enum {type_enum} should convert to '{expected_string}'"
 
     @pytest.mark.parametrize(
@@ -252,7 +252,7 @@ class TestIntegrationConverterToOrmKwargs:
             type=IntegrationType.CALENDAR,
             status=status_enum,
         )
-        result = IntegrationConverter.to_orm_kwargs(integration)
+        result = IntegrationConverter.to_integration_orm_kwargs(integration)
         assert result["status"] == expected_string, f"Status enum {status_enum} should convert to '{expected_string}'"
 
 
@@ -330,7 +330,7 @@ class TestSyncRunConverterOrmToDomain:
 
 
 class TestSyncRunConverterToOrmKwargs:
-    """Tests for SyncRunConverter.to_orm_kwargs."""
+    """Tests for SyncRunConverter.to_sync_run_orm_kwargs."""
 
     def test_sync_run_to_orm_kwargs(self) -> None:
         """Convert domain SyncRun to ORM kwargs dict."""
@@ -345,7 +345,7 @@ class TestSyncRunConverterToOrmKwargs:
             stats={"items_synced": SYNC_RUN_ITEMS_COMPLETE},
         )
 
-        result = SyncRunConverter.to_orm_kwargs(sync_run)
+        result = SyncRunConverter.to_sync_run_orm_kwargs(sync_run)
 
         assert result["id"] == sync_run.id, "ID should be preserved"
         assert result["integration_id"] == sync_run.integration_id, "Integration ID should be preserved"
@@ -371,7 +371,7 @@ class TestSyncRunConverterToOrmKwargs:
             status=status_enum,
             started_at=datetime(2024, 1, 15, 12, 0, 0, tzinfo=UTC),
         )
-        result = SyncRunConverter.to_orm_kwargs(sync_run)
+        result = SyncRunConverter.to_sync_run_orm_kwargs(sync_run)
         assert result["status"] == expected_string, f"Status enum {status_enum} should convert to '{expected_string}'"
 
 
@@ -412,7 +412,7 @@ class TestIntegrationConverterRoundTrip:
         self, round_trip_integration: Integration
     ) -> None:
         """Round-trip conversion preserves all Integration field values."""
-        orm_kwargs = IntegrationConverter.to_orm_kwargs(round_trip_integration)
+        orm_kwargs = IntegrationConverter.to_integration_orm_kwargs(round_trip_integration)
         mock_orm = _create_mock_integration_orm_from_kwargs(orm_kwargs)
         result = IntegrationConverter.orm_to_domain(mock_orm)
 
@@ -428,7 +428,7 @@ class TestIntegrationConverterRoundTrip:
         self, round_trip_sync_run: SyncRun
     ) -> None:
         """Round-trip conversion preserves all SyncRun field values."""
-        orm_kwargs = SyncRunConverter.to_orm_kwargs(round_trip_sync_run)
+        orm_kwargs = SyncRunConverter.to_sync_run_orm_kwargs(round_trip_sync_run)
         mock_orm = _create_mock_sync_run_orm_from_kwargs(orm_kwargs)
         result = SyncRunConverter.orm_to_domain(mock_orm)
 
diff --git a/uv.lock b/uv.lock
index 05d661a..2ea9a39 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1678,6 +1678,39 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/7b/91/984aca2ec129e2757d1e4e3c81c3fcda9d0f85b74670a094cc443d9ee949/joblib-1.5.3-py3-none-any.whl", hash = "sha256:5fc3c5039fc5ca8c0276333a188bbd59d6b7ab37fe6632daa76bc7f9ec18e713", size = 309071, upload-time = "2025-12-15T08:41:44.973Z" },
 ]
 
+[[package]]
+name = "jsonpatch"
+version = "1.33"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "jsonpointer" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/42/78/18813351fe5d63acad16aec57f94ec2b70a09e53ca98145589e185423873/jsonpatch-1.33.tar.gz", hash = "sha256:9fcd4009c41e6d12348b4a0ff2563ba56a2923a7dfee731d004e212e1ee5030c", size = 21699, upload-time = "2023-06-26T12:07:29.144Z" }
+wheels = [
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+]
+
+[[package]]
+name = "jsonpath-ng"
+version = "1.7.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "ply" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/6d/86/08646239a313f895186ff0a4573452038eed8c86f54380b3ebac34d32fb2/jsonpath-ng-1.7.0.tar.gz", hash = "sha256:f6f5f7fd4e5ff79c785f1573b394043b39849fb2bb47bcead935d12b00beab3c", size = 37838, upload-time = "2024-10-11T15:41:42.404Z" }
+wheels = [
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+]
+
+[[package]]
+name = "jsonpointer"
+version = "3.0.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/6a/0a/eebeb1fa92507ea94016a2a790b93c2ae41a7e18778f85471dc54475ed25/jsonpointer-3.0.0.tar.gz", hash = "sha256:2b2d729f2091522d61c3b31f82e11870f60b68f43fbc705cb76bf4b832af59ef", size = 9114, upload-time = "2024-06-10T19:24:42.462Z" }
+wheels = [
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+]
+
 [[package]]
 name = "julius"
 version = "0.2.7"
@@ -1776,6 +1809,130 @@ wheels = [
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 ]
 
+[[package]]
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+version = "1.2.7"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "jsonpatch" },
+    { name = "langsmith" },
+    { name = "packaging" },
+    { name = "pydantic" },
+    { name = "pyyaml" },
+    { name = "tenacity" },
+    { name = "typing-extensions" },
+    { name = "uuid-utils" },
+]
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+[[package]]
+name = "langgraph"
+version = "1.0.6"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "langchain-core" },
+    { name = "langgraph-checkpoint" },
+    { name = "langgraph-prebuilt" },
+    { name = "langgraph-sdk" },
+    { name = "pydantic" },
+    { name = "xxhash" },
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+[[package]]
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+version = "3.0.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "langchain-core" },
+    { name = "ormsgpack" },
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+[[package]]
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+version = "3.0.3"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "langgraph-checkpoint" },
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+[[package]]
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+version = "0.3.2"
+source = { registry = "https://pypi.org/simple" }
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+[[package]]
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+    { name = "packaging" },
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 [[package]]
 name = "librt"
 version = "0.7.4"
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+]
+
 [[package]]
 name = "more-itertools"
 version = "10.8.0"
@@ -2278,10 +2450,14 @@ dependencies = [
     { name = "grpcio-tools" },
     { name = "httpx" },
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     { name = "openai-whisper" },
     { name = "pgvector" },
     { name = "protobuf" },
     { name = "psutil" },
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