diff --git a/src/__tests__/prompts.test.ts b/src/__tests__/prompts.test.ts
index f6af374..55fb8bf 100644
--- a/src/__tests__/prompts.test.ts
+++ b/src/__tests__/prompts.test.ts
@@ -130,6 +130,7 @@ describe('template file existence', () => {
     'score_interactive_policy',
     'score_summary_system_prompt',
     'score_slug_system_prompt',
+    'score_slug_user_prompt',
     'perform_phase1_message',
     'perform_phase2_message',
     'perform_phase3_message',
diff --git a/src/__tests__/summarize.test.ts b/src/__tests__/summarize.test.ts
index 20ba865..db39382 100644
--- a/src/__tests__/summarize.test.ts
+++ b/src/__tests__/summarize.test.ts
@@ -57,20 +57,25 @@ describe('summarizeTaskName', () => {
       timestamp: new Date(),
     });
 
-    // When
-    const result = await summarizeTaskName('long task name for testing', { cwd: '/project' });
-
-    // Then
-    expect(result).toBe('add-auth');
-    expect(mockGetProvider).toHaveBeenCalledWith('claude');
-    expect(mockProviderCall).toHaveBeenCalledWith(
-      'long task name for testing',
-      expect.objectContaining({
-        cwd: '/project',
-        allowedTools: [],
-      })
-    );
-  });
+    // When
+    const result = await summarizeTaskName('long task name for testing', { cwd: '/project' });
+
+    // Then
+    expect(result).toBe('add-auth');
+    expect(mockGetProvider).toHaveBeenCalledWith('claude');
+    const callPrompt = mockProviderCall.mock.calls[0]?.[0];
+    expect(callPrompt).toContain('Generate a slug from the task description below.');
+    expect(callPrompt).toContain('<task_description>');
+    expect(callPrompt).toContain('long task name for testing');
+    expect(callPrompt).toContain('</task_description>');
+    expect(mockProviderCall).toHaveBeenCalledWith(
+      expect.any(String),
+      expect.objectContaining({
+        cwd: '/project',
+        permissionMode: 'readonly',
+      })
+    );
+  });
 
   it('should return AI-generated slug for English task name', async () => {
     // Given
diff --git a/src/infra/task/summarize.ts b/src/infra/task/summarize.ts
index 185bd13..a8c8041 100644
--- a/src/infra/task/summarize.ts
+++ b/src/infra/task/summarize.ts
@@ -70,10 +70,11 @@ export class TaskSummarizer {
       name: 'summarizer',
       systemPrompt: loadTemplate('score_slug_system_prompt', 'en'),
     });
-    const response = await agent.call(taskName, {
+    const prompt = loadTemplate('score_slug_user_prompt', 'en', { taskDescription: taskName });
+    const response = await agent.call(prompt, {
       cwd: options.cwd,
       model,
-      allowedTools: [],
+      permissionMode: 'readonly',
     });
 
     const slug = sanitizeSlug(response.content);
diff --git a/src/shared/prompts/en/score_slug_user_prompt.md b/src/shared/prompts/en/score_slug_user_prompt.md
new file mode 100644
index 0000000..bcdd39d
--- /dev/null
+++ b/src/shared/prompts/en/score_slug_user_prompt.md
@@ -0,0 +1,12 @@
+<!--
+  template: score_slug_user_prompt
+  role: user prompt for task-name-to-slug generation
+  vars: taskDescription
+  caller: infra/task/summarize
+-->
+Generate a slug from the task description below.
+Output ONLY the slug text.
+
+<task_description>
+{{taskDescription}}
+</task_description>
diff --git a/src/shared/prompts/ja/score_slug_user_prompt.md b/src/shared/prompts/ja/score_slug_user_prompt.md
new file mode 100644
index 0000000..bcdd39d
--- /dev/null
+++ b/src/shared/prompts/ja/score_slug_user_prompt.md
@@ -0,0 +1,12 @@
+<!--
+  template: score_slug_user_prompt
+  role: user prompt for task-name-to-slug generation
+  vars: taskDescription
+  caller: infra/task/summarize
+-->
+Generate a slug from the task description below.
+Output ONLY the slug text.
+
+<task_description>
+{{taskDescription}}
+</task_description>