diff --git a/src/clis/linux-do/categories.yaml b/src/clis/linux-do/categories.yaml
new file mode 100644
index 0000000..f5a6435
--- /dev/null
+++ b/src/clis/linux-do/categories.yaml
@@ -0,0 +1,41 @@
+site: linux-do
+name: categories
+description: linux.do 分类列表
+domain: linux.do
+browser: true
+
+args:
+  limit:
+    type: int
+    default: 20
+    description: Number of categories
+
+pipeline:
+  - navigate: https://linux.do
+
+  - evaluate: |
+      (async () => {
+        const res = await fetch('/categories.json', { credentials: 'include' });
+        if (!res.ok) throw new Error('HTTP ' + res.status + ' - 请先登录 linux.do');
+        let data;
+        try { data = await res.json(); } catch { throw new Error('响应不是有效 JSON - 请先登录 linux.do'); }
+        const cats = data?.category_list?.categories || [];
+        return cats.slice(0, ${{ args.limit }}).map(c => ({
+          name: c.name,
+          slug: c.slug,
+          id: c.id,
+          topics: c.topic_count,
+          description: (c.description_text || '').slice(0, 80),
+        }));
+      })()
+
+  - map:
+      name: ${{ item.name }}
+      slug: ${{ item.slug }}
+      id: ${{ item.id }}
+      topics: ${{ item.topics }}
+      description: ${{ item.description }}
+
+  - limit: ${{ args.limit }}
+
+columns: [name, slug, id, topics, description]
diff --git a/src/clis/linux-do/category.yaml b/src/clis/linux-do/category.yaml
new file mode 100644
index 0000000..9b52bfe
--- /dev/null
+++ b/src/clis/linux-do/category.yaml
@@ -0,0 +1,49 @@
+site: linux-do
+name: category
+description: linux.do 分类内话题
+domain: linux.do
+browser: true
+
+args:
+  slug:
+    type: str
+    required: true
+    description: Category slug (use 'categories' command to find)
+  id:
+    type: int
+    required: true
+    description: Category ID (use 'categories' command to find)
+  limit:
+    type: int
+    default: 20
+    description: Number of topics
+
+pipeline:
+  - navigate: https://linux.do
+
+  - evaluate: |
+      (async () => {
+        const slug = ${{ args.slug | json }};
+        const res = await fetch('/c/' + encodeURIComponent(slug) + '/${{ args.id }}.json', { credentials: 'include' });
+        if (!res.ok) throw new Error('HTTP ' + res.status + ' - 请先登录 linux.do');
+        let data;
+        try { data = await res.json(); } catch { throw new Error('响应不是有效 JSON - 请先登录 linux.do'); }
+        const topics = data?.topic_list?.topics || [];
+        return topics.slice(0, ${{ args.limit }}).map(t => ({
+          title: t.title,
+          replies: (t.posts_count || 1) - 1,
+          views: t.views,
+          likes: t.like_count,
+        }));
+      })()
+
+  - map:
+      rank: ${{ index + 1 }}
+      title: ${{ item.title }}
+      replies: ${{ item.replies }}
+      views: ${{ item.views }}
+      likes: ${{ item.likes }}
+
+  - limit: ${{ args.limit }}
+
+columns: [rank, title, replies, views, likes]
diff --git a/src/clis/linux-do/hot.yaml b/src/clis/linux-do/hot.yaml
new file mode 100644
index 0000000..0ca59de
--- /dev/null
+++ b/src/clis/linux-do/hot.yaml
@@ -0,0 +1,50 @@
+site: linux-do
+name: hot
+description: linux.do 热门话题
+domain: linux.do
+browser: true
+
+args:
+  limit:
+    type: int
+    default: 20
+    description: Number of topics
+  period:
+    type: str
+    default: weekly
+    description: Time period
+    choices: [all, daily, weekly, monthly, yearly]
+
+pipeline:
+  - navigate: https://linux.do
+
+  - evaluate: |
+      (async () => {
+        const period = ${{ args.period | json }};
+        const res = await fetch('/top.json?period=' + encodeURIComponent(period), { credentials: 'include' });
+        if (!res.ok) throw new Error('HTTP ' + res.status + ' - 请先登录 linux.do');
+        let data;
+        try { data = await res.json(); } catch { throw new Error('响应不是有效 JSON - 请先登录 linux.do'); }
+        const topics = data?.topic_list?.topics || [];
+        const cats = data?.topic_list?.categories || data?.categories || [];
+        const catMap = Object.fromEntries(cats.map(c => [c.id, c.name]));
+        return topics.slice(0, ${{ args.limit }}).map(t => ({
+          title: t.title,
+          replies: (t.posts_count || 1) - 1,
+          views: t.views,
+          likes: t.like_count,
+          category: catMap[t.category_id] || String(t.category_id),
+        }));
+      })()
+
+  - map:
+      rank: ${{ index + 1 }}
+      title: ${{ item.title }}
+      replies: ${{ item.replies }}
+      views: ${{ item.views }}
+      likes: ${{ item.likes }}
+      category: ${{ item.category }}
+
+  - limit: ${{ args.limit }}
+
+columns: [rank, title, replies, views, likes, category]
diff --git a/src/clis/linux-do/latest.yaml b/src/clis/linux-do/latest.yaml
new file mode 100644
index 0000000..3709346
--- /dev/null
+++ b/src/clis/linux-do/latest.yaml
@@ -0,0 +1,40 @@
+site: linux-do
+name: latest
+description: linux.do 最新话题
+domain: linux.do
+browser: true
+
+args:
+  limit:
+    type: int
+    default: 20
+    description: Number of topics
+
+pipeline:
+  - navigate: https://linux.do
+
+  - evaluate: |
+      (async () => {
+        const res = await fetch('/latest.json', { credentials: 'include' });
+        if (!res.ok) throw new Error('HTTP ' + res.status + ' - 请先登录 linux.do');
+        let data;
+        try { data = await res.json(); } catch { throw new Error('响应不是有效 JSON - 请先登录 linux.do'); }
+        const topics = data?.topic_list?.topics || [];
+        return topics.slice(0, ${{ args.limit }}).map(t => ({
+          title: t.title,
+          replies: (t.posts_count || 1) - 1,
+          views: t.views,
+          likes: t.like_count,
+        }));
+      })()
+
+  - map:
+      rank: ${{ index + 1 }}
+      title: ${{ item.title }}
+      replies: ${{ item.replies }}
+      views: ${{ item.views }}
+      likes: ${{ item.likes }}
+
+  - limit: ${{ args.limit }}
+
+columns: [rank, title, replies, views, likes]
diff --git a/src/clis/linux-do/search.yaml b/src/clis/linux-do/search.yaml
new file mode 100644
index 0000000..edc74d1
--- /dev/null
+++ b/src/clis/linux-do/search.yaml
@@ -0,0 +1,45 @@
+site: linux-do
+name: search
+description: 搜索 linux.do
+domain: linux.do
+browser: true
+
+args:
+  keyword:
+    type: str
+    required: true
+    description: Search keyword
+  limit:
+    type: int
+    default: 20
+    description: Number of results
+
+pipeline:
+  - navigate: https://linux.do
+
+  - evaluate: |
+      (async () => {
+        const keyword = ${{ args.keyword | json }};
+        const res = await fetch('/search.json?q=' + encodeURIComponent(keyword), { credentials: 'include' });
+        if (!res.ok) throw new Error('HTTP ' + res.status + ' - 请先登录 linux.do');
+        let data;
+        try { data = await res.json(); } catch { throw new Error('响应不是有效 JSON - 请先登录 linux.do'); }
+        const topics = data?.topics || [];
+        return topics.slice(0, ${{ args.limit }}).map(t => ({
+          title: t.title,
+          views: t.views,
+          likes: t.like_count,
+          replies: (t.posts_count || 1) - 1,
+        }));
+      })()
+
+  - map:
+      rank: ${{ index + 1 }}
+      title: ${{ item.title }}
+      views: ${{ item.views }}
+      likes: ${{ item.likes }}
+      replies: ${{ item.replies }}
+
+  - limit: ${{ args.limit }}
+
+columns: [rank, title, views, likes, replies]
diff --git a/src/clis/linux-do/topic.yaml b/src/clis/linux-do/topic.yaml
new file mode 100644
index 0000000..84bf151
--- /dev/null
+++ b/src/clis/linux-do/topic.yaml
@@ -0,0 +1,38 @@
+site: linux-do
+name: topic
+description: linux.do 帖子详情和回复（首页）
+domain: linux.do
+browser: true
+
+args:
+  id:
+    type: int
+    required: true
+    description: Topic ID
+
+pipeline:
+  - navigate: https://linux.do
+
+  - evaluate: |
+      (async () => {
+        const res = await fetch('/t/${{ args.id }}.json', { credentials: 'include' });
+        if (!res.ok) throw new Error('HTTP ' + res.status + ' - 请先登录 linux.do');
+        let data;
+        try { data = await res.json(); } catch { throw new Error('响应不是有效 JSON - 请先登录 linux.do'); }
+        const strip = (html) => (html || '').replace(/<br\s*\/?>/gi, ' ').replace(/<\/(p|div|li|blockquote|h[1-6])>/gi, ' ').replace(/<[^>]+>/g, '').replace(/&nbsp;/g, ' ').replace(/&amp;/g, '&').replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&quot;/g, '"').replace(/&#(?:(\d+)|x([0-9a-fA-F]+));/g, (_, dec, hex) => { try { return String.fromCodePoint(dec !== undefined ? Number(dec) : parseInt(hex, 16)); } catch { return ''; } }).replace(/\s+/g, ' ').trim();
+        const posts = data?.post_stream?.posts || [];
+        return posts.map(p => ({
+          author: p.username,
+          content: strip(p.cooked).slice(0, 200),
+          likes: p.like_count,
+          created_at: p.created_at,
+        }));
+      })()
+
+  - map:
+      author: ${{ item.author }}
+      content: ${{ item.content }}
+      likes: ${{ item.likes }}
+      created_at: ${{ item.created_at }}
+
+columns: [author, content, likes, created_at]
diff --git a/tests/e2e/browser-auth.test.ts b/tests/e2e/browser-auth.test.ts
index ccab466..3fff314 100644
--- a/tests/e2e/browser-auth.test.ts
+++ b/tests/e2e/browser-auth.test.ts
@@ -79,6 +79,31 @@ describe('login-required commands — graceful failure', () => {
     await expectGracefulAuthFailure(['xueqiu', 'watchlist', '-f', 'json'], 'xueqiu watchlist');
   }, 60_000);
 
+  // ── linux-do (requires login — all endpoints need authentication) ──
+  it('linux-do hot fails gracefully without login', async () => {
+    await expectGracefulAuthFailure(['linux-do', 'hot', '--limit', '3', '-f', 'json'], 'linux-do hot');
+  }, 60_000);
+
+  it('linux-do latest fails gracefully without login', async () => {
+    await expectGracefulAuthFailure(['linux-do', 'latest', '--limit', '3', '-f', 'json'], 'linux-do latest');
+  }, 60_000);
+
+  it('linux-do categories fails gracefully without login', async () => {
+    await expectGracefulAuthFailure(['linux-do', 'categories', '--limit', '3', '-f', 'json'], 'linux-do categories');
+  }, 60_000);
+
+  it('linux-do category fails gracefully without login', async () => {
+    await expectGracefulAuthFailure(['linux-do', 'category', '--slug', 'general', '--id', '1', '--limit', '3', '-f', 'json'], 'linux-do category');
+  }, 60_000);
+
+  it('linux-do topic fails gracefully without login', async () => {
+    await expectGracefulAuthFailure(['linux-do', 'topic', '--id', '1', '-f', 'json'], 'linux-do topic');
+  }, 60_000);
+
+  it('linux-do search fails gracefully without login', async () => {
+    await expectGracefulAuthFailure(['linux-do', 'search', '--keyword', 'test', '--limit', '3', '-f', 'json'], 'linux-do search');
+  }, 60_000);
+
   // ── xiaohongshu (requires login) ──
   it('xiaohongshu feed fails gracefully without login', async () => {
     await expectGracefulAuthFailure(['xiaohongshu', 'feed', '--limit', '3', '-f', 'json'], 'xiaohongshu feed');