diff --git a/docs/technical/TASK_AUTO_COMMIT_WORKFLOW_2026-04-20.md b/docs/technical/TASK_AUTO_COMMIT_WORKFLOW_2026-04-20.md
index 874b52b5..56c89fa8 100644
--- a/docs/technical/TASK_AUTO_COMMIT_WORKFLOW_2026-04-20.md
+++ b/docs/technical/TASK_AUTO_COMMIT_WORKFLOW_2026-04-20.md
@@ -47,6 +47,7 @@ node scripts/commit-task.mjs \
 3. 指定文件没有改动时不会创建空提交。
 4. 脚本不会自动把未指定文件加入提交。
 5. 脚本不做 `amend`，不改写历史。
+6. 即使索引里已经有其他已暂存文件，脚本也只会提交本次显式传入的文件。
 
 ## 5. 适用范围
 
@@ -76,3 +77,4 @@ node scripts/commit-task.mjs \
 
 1. `scripts/commit-task.test.ts`
 2. 覆盖“只提交指定文件，保留未指定改动在工作区”的核心行为
+3. 覆盖“已有其他 staged 改动时不混入当前提交”的边界行为
diff --git a/scripts/commit-task.mjs b/scripts/commit-task.mjs
index a9600054..7ac8b99e 100644
--- a/scripts/commit-task.mjs
+++ b/scripts/commit-task.mjs
@@ -54,4 +54,4 @@ if (!stagedOutput) {
   fail('暂存后没有检测到可提交内容');
 }
 
-runGit(['commit', '-m', message], { stdio: 'inherit' });
+runGit(['commit', '-m', message, '--', ...fileArgs], { stdio: 'inherit' });
diff --git a/scripts/commit-task.test.ts b/scripts/commit-task.test.ts
index a2a43715..b3e3b9cd 100644
--- a/scripts/commit-task.test.ts
+++ b/scripts/commit-task.test.ts
@@ -1,6 +1,6 @@
-import { mkdtempSync, mkdirSync, readFileSync, rmSync, writeFileSync } from 'node:fs';
+import { mkdtempSync, mkdirSync, rmSync, writeFileSync } from 'node:fs';
 import { tmpdir } from 'node:os';
-import { dirname, resolve } from 'node:path';
+import { resolve } from 'node:path';
 import { spawnSync } from 'node:child_process';
 
 import { afterEach, describe, expect, it } from 'vitest';
@@ -84,4 +84,53 @@ describe('commit-task script', () => {
     expect(statusResult.stdout).toContain(' M notes/other.md');
     expect(statusResult.stdout).not.toContain('docs/task.md');
   });
+
+  it('does not include unrelated staged files in the commit', () => {
+    const repoRoot = mkdtempSync(resolve(tmpdir(), 'genarrative-commit-task-'));
+    tempDirs.push(repoRoot);
+
+    mustRun('git', ['init'], repoRoot);
+    mustRun('git', ['config', 'user.name', 'Codex Test'], repoRoot);
+    mustRun('git', ['config', 'user.email', 'codex@example.com'], repoRoot);
+
+    mkdirSync(resolve(repoRoot, 'docs'), { recursive: true });
+    mkdirSync(resolve(repoRoot, 'notes'), { recursive: true });
+    writeFileSync(resolve(repoRoot, 'docs', 'task.md'), 'v1\n', 'utf8');
+    writeFileSync(resolve(repoRoot, 'notes', 'other.md'), 'other v1\n', 'utf8');
+
+    mustRun('git', ['add', '.'], repoRoot);
+    mustRun('git', ['commit', '-m', 'init'], repoRoot);
+
+    writeFileSync(resolve(repoRoot, 'docs', 'task.md'), 'v2\n', 'utf8');
+    writeFileSync(resolve(repoRoot, 'notes', 'other.md'), 'other v2\n', 'utf8');
+    mustRun('git', ['add', 'notes/other.md'], repoRoot);
+
+    const scriptPath = resolve('/home/Genarrative/scripts/commit-task.mjs');
+    mustRun(
+      'node',
+      [scriptPath, '-m', '只提交任务文件', 'docs/task.md'],
+      repoRoot,
+      {
+        GENARRATIVE_COMMIT_REPO_ROOT: repoRoot,
+      },
+    );
+
+    const committedTaskContent = mustRun(
+      'git',
+      ['show', 'HEAD:docs/task.md'],
+      repoRoot,
+    ).stdout;
+    expect(committedTaskContent).toBe('v2\n');
+
+    const committedOtherContent = mustRun(
+      'git',
+      ['show', 'HEAD:notes/other.md'],
+      repoRoot,
+    ).stdout;
+    expect(committedOtherContent).toBe('other v1\n');
+
+    const statusResult = mustRun('git', ['status', '--short'], repoRoot);
+    expect(statusResult.stdout).toContain('M  notes/other.md');
+    expect(statusResult.stdout).not.toContain('docs/task.md');
+  });
 });