diff --git a/app/api/projects/[projectId]/meetings/[id]/route.ts b/app/api/projects/[projectId]/meetings/[id]/route.ts
index ce7859c..46eb3ca 100644
--- a/app/api/projects/[projectId]/meetings/[id]/route.ts
+++ b/app/api/projects/[projectId]/meetings/[id]/route.ts
@@ -61,6 +61,7 @@ export async function POST(
   const service = createMeetingService();
   try {
     const conflicts = service.checkScheduleConflicts(
+      user.id,
       Number(projectId),
       Array.isArray(body.memberIds) ? body.memberIds.map(Number) : [],
       String(body.startAt ?? ''),
diff --git a/playwright.config.ts b/playwright.config.ts
index 4addb17..f8d5a2b 100644
--- a/playwright.config.ts
+++ b/playwright.config.ts
@@ -6,7 +6,7 @@ export default defineConfig({
   fullyParallel: true,
   forbidOnly: !!process.env.CI,
   retries: process.env.CI ? 2 : 0,
-  workers: process.env.CI ? 1 : undefined,
+  workers: 1,
   reporter: 'html',
   globalSetup: './tests/e2e/globalSetup.ts',
   use: {
diff --git a/services/MeetingService.ts b/services/MeetingService.ts
index 273ae87..070574d 100644
--- a/services/MeetingService.ts
+++ b/services/MeetingService.ts
@@ -75,6 +75,7 @@ export class MeetingService {
     this.requireMember(projectId, actorId);
     this.validate(input);
     const conflicts = this.checkScheduleConflicts(
+      actorId,
       projectId,
       input.memberIds,
       input.startAt,
@@ -175,12 +176,14 @@ export class MeetingService {
    * 重複は警告(作成ブロックしない)。時間重複 = NOT(existing.end <= new.start OR existing.start >= new.end)
    */
   checkScheduleConflicts(
+    actorId: number,
     projectId: number,
     memberIds: number[],
     startAt: string,
     endAt: string,
     excludeMeetingId?: number
   ): ScheduleConflict[] {
+    this.requireMember(projectId, actorId);
     const conflicts: ScheduleConflict[] = [];
     const newStart = new Date(startAt).getTime();
     const newEnd = new Date(endAt).getTime();
diff --git a/services/SearchService.ts b/services/SearchService.ts
index 206fca5..c27c8f0 100644
--- a/services/SearchService.ts
+++ b/services/SearchService.ts
@@ -31,6 +31,9 @@ export interface SearchOptions {
   type?: SearchResourceType;
 }
 
+// 検索は全件対象とする(ページネーション既定値による検索漏れを防ぐ)
+const SEARCH_MAX = Number.MAX_SAFE_INTEGER;
+
 /**
  * プロジェクト内の横断検索を担うService。
  * 各リソースを取得しキーワードで絞り込む(小規模データ前提)。
@@ -62,7 +65,10 @@ export class SearchService {
       !!text && text.toLowerCase().includes(q);
 
     if (!type || type === 'thread') {
-      for (const t of this.boardRepository.findThreads(projectId).items) {
+      for (const t of this.boardRepository.findThreads(projectId, {
+        page: 1,
+        pageSize: SEARCH_MAX,
+      }).items) {
         if (match(t.title) || match(t.bodyMd)) {
           results.push({
             type: 'thread',
@@ -74,7 +80,10 @@ export class SearchService {
       }
     }
     if (!type || type === 'chat') {
-      for (const m of this.chatRepository.findMessages(projectId).items) {
+      for (const m of this.chatRepository.findMessages(projectId, {
+        page: 1,
+        pageSize: SEARCH_MAX,
+      }).items) {
         if (match(m.body)) {
           results.push({
             type: 'chat',
@@ -101,7 +110,7 @@ export class SearchService {
       const files = this.fileRepository.findFilesByProject(
         projectId,
         1,
-        500
+        SEARCH_MAX
       ).items;
       for (const f of files) {
         if (match(f.originalName)) {
@@ -156,7 +165,10 @@ export class SearchService {
       }
     }
     if (!type || type === 'note') {
-      for (const n of this.noteRepository.findNotes(projectId).items) {
+      for (const n of this.noteRepository.findNotes(projectId, {
+        page: 1,
+        pageSize: SEARCH_MAX,
+      }).items) {
         if (match(n.title) || match(n.bodyMd) || match(n.tags)) {
           results.push({
             type: 'note',
diff --git a/tests/e2e/activity-log.spec.ts b/tests/e2e/activity-log.spec.ts
new file mode 100644
index 0000000..c2cd46c
--- /dev/null
+++ b/tests/e2e/activity-log.spec.ts
@@ -0,0 +1,49 @@
+import { test, expect } from '@playwright/test';
+
+function unique(prefix: string): string {
+  return `${prefix}-${Date.now()}-${Math.floor(Math.random() * 1_000_000)}`;
+}
+
+async function setupOwner(page: import('@playwright/test').Page) {
+  const email = unique('owner') + '@example.com';
+  await page.goto('/login');
+  await page.getByRole('button', { name: '新規登録はこちら' }).click();
+  await page.getByLabel('表示名').fill('Owner');
+  await page.getByLabel('メールアドレス').fill(email);
+  await page.getByLabel('パスワード').fill('password123');
+  await page.getByRole('button', { name: '登録する' }).click();
+  await expect(page).toHaveURL(/\/dashboard/);
+  await page.getByLabel('プロジェクト名').fill(unique('Proj'));
+  await page.getByRole('button', { name: '新規プロジェクト' }).click();
+  await expect(page).toHaveURL(/\/projects\/\d+$/);
+  return Number(page.url().match(/\/projects\/(\d+)/)![1]);
+}
+
+test.describe('activity log', () => {
+  test('board post and todo creation are recorded in the project activity log', async ({
+    page,
+  }) => {
+    const projectId = await setupOwner(page);
+
+    // 掲示板投稿 → board_posted アクティビティ
+    await page.request.post(`/api/projects/${projectId}/board/threads`, {
+      data: { title: unique('Thread'), bodyMd: 'body', category: 'notice' },
+    });
+    // ToDo作成 → todo_created アクティビティ
+    const cols = (
+      (await (
+        await page.request.get(`/api/projects/${projectId}/todos/columns`)
+      ).json()) as {
+        columns: { id: number }[];
+      }
+    ).columns;
+    await page.request.post(`/api/projects/${projectId}/todos/items`, {
+      data: { title: unique('Task'), columnId: cols[0].id },
+    });
+
+    // アクティビティ画面に両方のアクションが記録されている
+    await page.goto(`/projects/${projectId}/activity`);
+    await expect(page.getByText('掲示板投稿')).toBeVisible();
+    await expect(page.getByText('ToDo作成')).toBeVisible();
+  });
+});
diff --git a/tests/e2e/notifications.spec.ts b/tests/e2e/notifications.spec.ts
new file mode 100644
index 0000000..a477cc5
--- /dev/null
+++ b/tests/e2e/notifications.spec.ts
@@ -0,0 +1,69 @@
+import { test, expect, type Page } from '@playwright/test';
+
+function unique(prefix: string): string {
+  return `${prefix}-${Date.now()}-${Math.floor(Math.random() * 1_000_000)}`;
+}
+
+async function registerAndLogin(page: Page, email: string, name: string) {
+  await page.goto('/login');
+  await page.getByRole('button', { name: '新規登録はこちら' }).click();
+  await page.getByLabel('表示名').fill(name);
+  await page.getByLabel('メールアドレス').fill(email);
+  await page.getByLabel('パスワード').fill('password123');
+  await page.getByRole('button', { name: '登録する' }).click();
+  await expect(page).toHaveURL(/\/dashboard/);
+}
+
+test.describe('notifications', () => {
+  test('member-added notification appears and can be marked read', async ({
+    browser,
+  }) => {
+    const ownerEmail = unique('owner') + '@example.com';
+    const memberEmail = unique('member') + '@example.com';
+
+    // メンバーを先に登録(UIで作成+ログイン)
+    const memberContext = await browser.newContext();
+    const memberPage = await memberContext.newPage();
+    await registerAndLogin(memberPage, memberEmail, 'Member');
+
+    // オーナー登録＋プロジェクト作成
+    const ownerContext = await browser.newContext();
+    const ownerPage = await ownerContext.newPage();
+    await registerAndLogin(ownerPage, ownerEmail, 'Owner');
+    await ownerPage.getByLabel('プロジェクト名').fill(unique('Proj'));
+    await ownerPage.getByRole('button', { name: '新規プロジェクト' }).click();
+    await expect(ownerPage).toHaveURL(/\/projects\/\d+$/);
+    const projectId = Number(ownerPage.url().match(/\/projects\/(\d+)/)![1]);
+
+    // メンバー追加 → project_added 通知がメンバーへ
+    const addRes = await ownerPage.request.post(
+      `/api/projects/${projectId}/members`,
+      { data: { email: memberEmail, role: 'member' } }
+    );
+    expect(addRes.ok()).toBeTruthy();
+
+    // メンバーの通知一覧に表示
+    await memberPage.goto('/notifications');
+    await expect(
+      memberPage.getByText('プロジェクトに追加されました')
+    ).toBeVisible();
+
+    // 既読化(API) → 一覧が空になる
+    const listRes = await memberPage.request.get('/api/notifications?page=1');
+    const { items } = (await listRes.json()) as {
+      items: { id: number }[];
+    };
+    expect(items).toHaveLength(1);
+    const readRes = await memberPage.request.post(
+      `/api/notifications/${items[0].id}/read`
+    );
+    expect(readRes.ok()).toBeTruthy();
+    await memberPage.reload();
+    await expect(
+      memberPage.getByText('未読の通知はありません。')
+    ).toBeVisible();
+
+    await ownerContext.close();
+    await memberContext.close();
+  });
+});
diff --git a/tests/unit/services/MeetingService.test.ts b/tests/unit/services/MeetingService.test.ts
index 7c01f9a..07165e6 100644
--- a/tests/unit/services/MeetingService.test.ts
+++ b/tests/unit/services/MeetingService.test.ts
@@ -91,6 +91,7 @@ describe('MeetingService', () => {
       }).meeting;
       // 新しいミーティング(10:30-11:30)は重複
       const conflicts = service.checkScheduleConflicts(
+        authorId,
         projectId,
         [memberId],
         '2026-06-15T10:30:00',
@@ -109,6 +110,7 @@ describe('MeetingService', () => {
         memberIds: [memberId],
       });
       const conflicts = service.checkScheduleConflicts(
+        authorId,
         projectId,
         [memberId],
         '2026-06-15T11:00:00',
@@ -125,6 +127,7 @@ describe('MeetingService', () => {
         memberIds: [memberId],
       }).meeting;
       const conflicts = service.checkScheduleConflicts(
+        authorId,
         projectId,
         [memberId],
         '2026-06-15T10:30:00',
@@ -144,6 +147,7 @@ describe('MeetingService', () => {
         createdById: memberId,
       });
       const conflicts = service.checkScheduleConflicts(
+        authorId,
         projectId,
         [memberId],
         '2026-06-15T10:30:00',
@@ -169,6 +173,7 @@ describe('MeetingService', () => {
         orderIndex: 0,
       });
       const conflicts = service.checkScheduleConflicts(
+        authorId,
         projectId,
         [memberId],
         '2026-06-15T10:00:00',
@@ -194,6 +199,7 @@ describe('MeetingService', () => {
         orderIndex: 0,
       });
       const conflicts = service.checkScheduleConflicts(
+        authorId,
         projectId,
         [memberId],
         '2026-06-15T10:00:00',