diff --git a/src/__tests__/addTask.test.ts b/src/__tests__/addTask.test.ts
index 8b94428..7396187 100644
--- a/src/__tests__/addTask.test.ts
+++ b/src/__tests__/addTask.test.ts
@@ -8,11 +8,6 @@ vi.mock('../features/interactive/index.js', () => ({
   interactiveMode: vi.fn(),
 }));
 
-vi.mock('../infra/config/global/globalConfig.js', () => ({
-  loadGlobalConfig: vi.fn(() => ({ provider: 'claude' })),
-  getBuiltinPiecesEnabled: vi.fn().mockReturnValue(true),
-}));
-
 vi.mock('../shared/prompt/index.js', () => ({
   promptInput: vi.fn(),
   confirm: vi.fn(),
@@ -38,15 +33,6 @@ vi.mock('../features/tasks/execute/selectAndExecute.js', () => ({
   determinePiece: vi.fn(),
 }));
 
-vi.mock('../infra/config/loaders/pieceResolver.js', () => ({
-  getPieceDescription: vi.fn(() => ({
-    name: 'default',
-    description: '',
-    pieceStructure: '1. implement\n2. review',
-    movementPreviews: [],
-  })),
-}));
-
 vi.mock('../infra/github/issue.js', () => ({
   isIssueReference: vi.fn((s: string) => /^#\d+$/.test(s)),
   resolveIssueTask: vi.fn(),
@@ -65,16 +51,17 @@ vi.mock('../infra/github/issue.js', () => ({
 
 import { interactiveMode } from '../features/interactive/index.js';
 import { promptInput, confirm } from '../shared/prompt/index.js';
+import { info } from '../shared/ui/index.js';
 import { determinePiece } from '../features/tasks/execute/selectAndExecute.js';
-import { resolveIssueTask, createIssue } from '../infra/github/issue.js';
+import { resolveIssueTask } from '../infra/github/issue.js';
 import { addTask } from '../features/tasks/index.js';
 
-const mockResolveIssueTask = vi.mocked(resolveIssueTask);
 const mockInteractiveMode = vi.mocked(interactiveMode);
 const mockPromptInput = vi.mocked(promptInput);
 const mockConfirm = vi.mocked(confirm);
+const mockInfo = vi.mocked(info);
 const mockDeterminePiece = vi.mocked(determinePiece);
-const mockCreateIssue = vi.mocked(createIssue);
+const mockResolveIssueTask = vi.mocked(resolveIssueTask);
 
 let testDir: string;
 
@@ -101,25 +88,38 @@ describe('addTask', () => {
     return fs.readFileSync(path.join(dir, String(taskDir), 'order.md'), 'utf-8');
   }
 
-  it('should create task entry from interactive result', async () => {
-    mockInteractiveMode.mockResolvedValue({ action: 'execute', task: '# 認証機能追加\nJWT認証を実装する' });
-
+  it('should show usage and exit when task is missing', async () => {
     await addTask(testDir);
 
-    const tasks = loadTasks(testDir).tasks;
-    expect(tasks).toHaveLength(1);
-    expect(tasks[0]?.content).toBeUndefined();
-    expect(tasks[0]?.task_dir).toBeTypeOf('string');
-    expect(readOrderContent(testDir, tasks[0]?.task_dir)).toContain('JWT認証を実装する');
-    expect(tasks[0]?.piece).toBe('default');
+    expect(mockInfo).toHaveBeenCalledWith('Usage: takt add <task>');
+    expect(mockDeterminePiece).not.toHaveBeenCalled();
+    expect(fs.existsSync(path.join(testDir, '.takt', 'tasks.yaml'))).toBe(false);
+  });
+
+  it('should show usage and exit when task is blank', async () => {
+    await addTask(testDir, '   ');
+
+    expect(mockInfo).toHaveBeenCalledWith('Usage: takt add <task>');
+    expect(mockDeterminePiece).not.toHaveBeenCalled();
+    expect(fs.existsSync(path.join(testDir, '.takt', 'tasks.yaml'))).toBe(false);
+  });
+
+  it('should save plain text task without interactive mode', async () => {
+    await addTask(testDir, '  JWT認証を実装する  ');
+
+    expect(mockInteractiveMode).not.toHaveBeenCalled();
+    const task = loadTasks(testDir).tasks[0]!;
+    expect(task.content).toBeUndefined();
+    expect(task.task_dir).toBeTypeOf('string');
+    expect(readOrderContent(testDir, task.task_dir)).toContain('JWT認証を実装する');
+    expect(task.piece).toBe('default');
   });
 
   it('should include worktree settings when enabled', async () => {
-    mockInteractiveMode.mockResolvedValue({ action: 'execute', task: 'Task content' });
     mockConfirm.mockResolvedValue(true);
     mockPromptInput.mockResolvedValueOnce('/custom/path').mockResolvedValueOnce('feat/branch');
 
-    await addTask(testDir);
+    await addTask(testDir, 'Task content');
 
     const task = loadTasks(testDir).tasks[0]!;
     expect(task.worktree).toBe('/custom/path');
@@ -128,7 +128,6 @@ describe('addTask', () => {
 
   it('should create task from issue reference without interactive mode', async () => {
     mockResolveIssueTask.mockReturnValue('Issue #99: Fix login timeout');
-    mockConfirm.mockResolvedValue(false);
 
     await addTask(testDir, '#99');
 
@@ -142,37 +141,8 @@ describe('addTask', () => {
   it('should not create task when piece selection is cancelled', async () => {
     mockDeterminePiece.mockResolvedValue(null);
 
-    await addTask(testDir);
+    await addTask(testDir, 'Task content');
 
     expect(fs.existsSync(path.join(testDir, '.takt', 'tasks.yaml'))).toBe(false);
   });
-
-  it('should create issue and save task when create_issue action is chosen', async () => {
-    // Given
-    mockInteractiveMode.mockResolvedValue({ action: 'create_issue', task: 'New feature' });
-    mockCreateIssue.mockReturnValue({ success: true, url: 'https://github.com/owner/repo/issues/55' });
-    mockConfirm.mockResolvedValue(false);
-
-    // When
-    await addTask(testDir);
-
-    // Then
-    const tasks = loadTasks(testDir).tasks;
-    expect(tasks).toHaveLength(1);
-    expect(tasks[0]?.issue).toBe(55);
-    expect(tasks[0]?.content).toBeUndefined();
-    expect(readOrderContent(testDir, tasks[0]?.task_dir)).toContain('New feature');
-  });
-
-  it('should not save task when issue creation fails in create_issue action', async () => {
-    // Given
-    mockInteractiveMode.mockResolvedValue({ action: 'create_issue', task: 'New feature' });
-    mockCreateIssue.mockReturnValue({ success: false, error: 'auth failed' });
-
-    // When
-    await addTask(testDir);
-
-    // Then
-    expect(fs.existsSync(path.join(testDir, '.takt', 'tasks.yaml'))).toBe(false);
-  });
 });
diff --git a/src/app/cli/commands.ts b/src/app/cli/commands.ts
index 215e1b8..4c12eb1 100644
--- a/src/app/cli/commands.ts
+++ b/src/app/cli/commands.ts
@@ -30,7 +30,7 @@ program
 
 program
   .command('add')
-  .description('Add a new task (interactive AI conversation)')
+  .description('Add a new task')
   .argument('[task]', 'Task description or GitHub issue reference (e.g. "#28")')
   .action(async (task?: string) => {
     await addTask(resolvedCwd, task);
diff --git a/src/features/tasks/add/index.ts b/src/features/tasks/add/index.ts
index 1b80800..b179b63 100644
--- a/src/features/tasks/add/index.ts
+++ b/src/features/tasks/add/index.ts
@@ -1,8 +1,7 @@
 /**
  * add command implementation
  *
- * Starts an AI conversation to refine task requirements,
- * then appends a task record to .takt/tasks.yaml.
+ * Appends a task record to .takt/tasks.yaml.
  */
 
 import * as path from 'node:path';
@@ -10,11 +9,9 @@ import * as fs from 'node:fs';
 import { promptInput, confirm } from '../../../shared/prompt/index.js';
 import { success, info, error } from '../../../shared/ui/index.js';
 import { TaskRunner, type TaskFileData } from '../../../infra/task/index.js';
-import { getPieceDescription, loadGlobalConfig } from '../../../infra/config/index.js';
 import { determinePiece } from '../execute/selectAndExecute.js';
 import { createLogger, getErrorMessage, generateReportDir } from '../../../shared/utils/index.js';
 import { isIssueReference, resolveIssueTask, parseIssueNumbers, createIssue } from '../../../infra/github/index.js';
-import { interactiveMode } from '../../interactive/index.js';
 
 const log = createLogger('add-task');
 
@@ -163,66 +160,44 @@ export async function saveTaskFromInteractive(
  * add command handler
  *
  * Flow:
- *   A) Issue参照の場合: issue取得 → ピース選択 → ワークツリー設定 → YAML作成
- *   B) それ以外: ピース選択 → AI対話モード → ワークツリー設定 → YAML作成
+ *   A) 引数なし: Usage表示して終了
+ *   B) Issue参照の場合: issue取得 → ピース選択 → ワークツリー設定 → YAML作成
+ *   C) 通常入力: 引数をそのまま保存
  */
 export async function addTask(cwd: string, task?: string): Promise<void> {
-  // ピース選択とタスク内容の決定
+  const rawTask = task ?? '';
+  const trimmedTask = rawTask.trim();
+  if (!trimmedTask) {
+    info('Usage: takt add <task>');
+    return;
+  }
+
   let taskContent: string;
   let issueNumber: number | undefined;
-  let piece: string | undefined;
 
-  if (task && isIssueReference(task)) {
+  if (isIssueReference(trimmedTask)) {
     // Issue reference: fetch issue and use directly as task content
     info('Fetching GitHub Issue...');
     try {
-      taskContent = resolveIssueTask(task);
-      const numbers = parseIssueNumbers([task]);
+      taskContent = resolveIssueTask(trimmedTask);
+      const numbers = parseIssueNumbers([trimmedTask]);
       if (numbers.length > 0) {
         issueNumber = numbers[0];
       }
     } catch (e) {
       const msg = getErrorMessage(e);
-      log.error('Failed to fetch GitHub Issue', { task, error: msg });
-      info(`Failed to fetch issue ${task}: ${msg}`);
+      log.error('Failed to fetch GitHub Issue', { task: trimmedTask, error: msg });
+      info(`Failed to fetch issue ${trimmedTask}: ${msg}`);
       return;
     }
-
-    // ピース選択（issue取得成功後）
-    const pieceId = await determinePiece(cwd);
-    if (pieceId === null) {
-      info('Cancelled.');
-      return;
-    }
-    piece = pieceId;
   } else {
-    // ピース選択を先に行い、結果を対話モードに渡す
-    const pieceId = await determinePiece(cwd);
-    if (pieceId === null) {
-      info('Cancelled.');
-      return;
-    }
-    piece = pieceId;
+    taskContent = rawTask;
+  }
 
-    const globalConfig = loadGlobalConfig();
-    const previewCount = globalConfig.interactivePreviewMovements;
-    const pieceContext = getPieceDescription(pieceId, cwd, previewCount);
-
-    // Interactive mode: AI conversation to refine task
-    const result = await interactiveMode(cwd, undefined, pieceContext);
-
-    if (result.action === 'create_issue') {
-      await createIssueAndSaveTask(cwd, result.task, piece);
-      return;
-    }
-
-    if (result.action !== 'execute' && result.action !== 'save_task') {
-      info('Cancelled.');
-      return;
-    }
-
-    // interactiveMode already returns a summarized task from conversation
-    taskContent = result.task;
+  const piece = await determinePiece(cwd);
+  if (piece === null) {
+    info('Cancelled.');
+    return;
   }
 
   // 3. ワークツリー/ブランチ/PR設定