diff --git a/README.md b/README.md
index 8a14987..1afe55e 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@
 - **💻 真实终端**：xterm.js + node-pty 真实 shell，断线重连回放；可选为模型注入 `terminal_*` 工具
 - **🌿 Git 面板**：真 diff + VSCode 式 diff tab、历史、右键暂存 / 提交 / 还原
 - **🧩 后台任务页**：subagent 拓扑 + 后台任务（退出码 / 实时输出 / 强制终止）
-- **💬 侧边对话**：Codex 风格的侧边线程——继承主会话完整上下文（含进行中的回合与工具调用）独立运行，不进入主会话；线程内可持续追问，一键「保存为新会话」提升为顶层会话
+- **💬 侧边对话(beta)**：Codex 风格的侧边线程——继承主会话完整上下文（含进行中的回合与工具调用）独立运行，不进入主会话；线程内可持续追问，一键「保存为新会话」提升为顶层会话
 - **🪟 双工作台**：右侧栏 + 底部面板；拖 Tab 拆分 / 合并分栏（可跨面板），移动端自动合并全宽抽屉
 - **🔁 会话隔离**：布局 / Tab / 面板按会话持久化，陈旧状态自动净化
 - **⚙️ 声明式设置**：设置页「侧边卡片」逐项独立开关，二级设置经齿轮弹窗
@@ -47,7 +47,7 @@
 
 **✨ 新功能**
 
-- 💬 **侧边对话 Tab**：Codex 风格的侧边线程——子会话继承主会话**完整上下文**（已完成回合 + 未回答消息 + 进行中回合的 assistant 输出与工具调用，以「interrupted」冻结标记诚实继承）；同组合创建（同 preset / provider / model）复用前缀输入缓存；线程对主会话列表不可见、零子代理目录噪音；线程内可持续追问（重启后自动恢复）；一键「保存为新会话」提升为顶层会话（[设计文档](docs/plans/2026-08-20-sidechat-tab-design.md)）
+- 💬 **侧边对话(beta) Tab**：Codex 风格的侧边线程——子会话继承主会话**完整上下文**（已完成回合 + 未回答消息 + 进行中回合的 assistant 输出与工具调用，以「interrupted」冻结标记诚实继承）；同组合创建（同 preset / provider / model）复用前缀输入缓存；线程对主会话列表不可见、零子代理目录噪音；线程内可持续追问（重启后自动恢复）；一键「保存为新会话」提升为顶层会话（[设计文档](docs/plans/2026-08-20-sidechat-tab-design.md)）
 
 ### v0.14.1
 
diff --git a/README_EN.md b/README_EN.md
index 72b9459..9e54ea1 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -26,7 +26,7 @@
 - **💻 Real Terminal**: xterm.js + node-pty real shell, reconnect with transcript replay; optionally injects `terminal_*` tools for the model
 - **🌿 Git Panel**: real diff + VSCode-style diff tabs, history, right-click to stage / commit / revert
 - **🧩 Background Tasks**: agent topology + background tasks (exit codes / live output / force-kill)
-- **💬 Side Chat**: Codex-style side threads — the child inherits the parent's FULL context (completed turns + the pending question + the in-progress turn's assistant output and tool activity, honestly frozen as "interrupted") and runs independently without entering the main conversation; threads support continuous follow-ups (auto-resumed after a DSH restart) and one-click "Save as new session" promotion to a top-level session
+- **💬 Side Chat (beta)**: Codex-style side threads — the child inherits the parent's FULL context (completed turns + the pending question + the in-progress turn's assistant output and tool activity, honestly frozen as "interrupted") and runs independently without entering the main conversation; threads support continuous follow-ups (auto-resumed after a DSH restart) and one-click "Save as new session" promotion to a top-level session
 - **🪟 Dual Workbench**: right sidebar + bottom panel; drag tabs to split / merge panes (cross-panel), mobile auto-merges into a full-width drawer
 - **🔁 Session Isolation**: layout / tabs / panels persisted per session, stale state auto-purged
 - **⚙️ Declarative Settings**: per-item toggles in the "Side Cards" settings section, secondary settings via the gear dialog
@@ -46,7 +46,7 @@
 
 **✨ New features**
 
-- 💬 **Side Chat tab**: Codex-style side threads — the child inherits the parent's FULL context (completed turns + pending message + the in-progress turn's assistant output and tool activity, honestly frozen with an "interrupted" marker); created with an identical composition (same preset / provider / model) so the first request reuses the parent's input prefix cache; threads stay invisible in the main session list with zero subagent-catalog noise; follow-ups survive DSH restarts (auto cold-resume); one-click "Save as new session" promotes the thread to a top-level session ([design](docs/plans/2026-08-20-sidechat-tab-design.md))
+- 💬 **Side Chat (beta) tab**: Codex-style side threads — the child inherits the parent's FULL context (completed turns + pending message + the in-progress turn's assistant output and tool activity, honestly frozen with an "interrupted" marker); created with an identical composition (same preset / provider / model) so the first request reuses the parent's input prefix cache; threads stay invisible in the main session list with zero subagent-catalog noise; follow-ups survive DSH restarts (auto cold-resume); one-click "Save as new session" promotes the thread to a top-level session ([design](docs/plans/2026-08-20-sidechat-tab-design.md))
 
 ### v0.14.1
 
diff --git a/src/client/locales.ts b/src/client/locales.ts
index bff0643..8a9bbc7 100644
--- a/src/client/locales.ts
+++ b/src/client/locales.ts
@@ -247,7 +247,7 @@ export const zh = {
   subagentDiagUnsupported: '不支持的条目',
   subagentDiagUnavailable: '不可用',
   subagentThinking: '思考中…',
-  sideChat: '侧边对话',
+  sideChat: '侧边对话(beta)',
   sideChatNew: '新建对话',
   sideChatUntitled: '新对话',
   sideChatEmpty: '暂无侧边对话',
@@ -553,7 +553,7 @@ export const en: Record<keyof typeof zh, string> = {
   subagentDiagUnsupported: 'Unsupported',
   subagentDiagUnavailable: 'Unavailable',
   subagentThinking: 'Thinking…',
-  sideChat: 'Side Chat',
+  sideChat: 'Side Chat (beta)',
   sideChatNew: 'New thread',
   sideChatUntitled: 'New thread',
   sideChatEmpty: 'No side conversations',
diff --git a/tests/e2e/mount.e2e.ts b/tests/e2e/mount.e2e.ts
index 9d96f2b..bc44df1 100644
--- a/tests/e2e/mount.e2e.ts
+++ b/tests/e2e/mount.e2e.ts
@@ -56,7 +56,7 @@ const SEEDED_MD_FILE = 'diagram.md'
 const CRASH_STRIP_PATTERNS = [/^dsh-better-sidebar:/, /^\[dsh-better-sidebar\]/]
 
 /** Built-in tab titles the sweep drives (en-US copy; follows DSH locale). */
-const BUILTIN_TABS = ['Files', 'Source Control', 'Tasks', 'Side Chat', 'Terminal', 'Browser']
+const BUILTIN_TABS = ['Files', 'Source Control', 'Tasks', 'Side Chat (beta)', 'Terminal', 'Browser']
 
 let api: APIRequestContext
 /** The seeded session id (captured by seedSession; the Side Chat smoke's parent). */