diff --git a/Agent.md b/Agent.md
index 6a0b3b75..95d5db78 100644
--- a/Agent.md
+++ b/Agent.md
@@ -85,7 +85,7 @@ Usage: say "tool loop" for the whole process, "round N" for a single LLM request
   - Streaming chat with delta rendering (16ms batching), markdown on done (marked + DOMPurify + local highlight.js subset), tool call status cards (2000-char truncation + expand)
   - Session list/switch/new/delete + right-click rename (context menu, #423) synced with daemon; own-stream busy lock (G65); broadcast streams from other clients tagged "来自其他客户端"
   - Disconnect/reconnect: red status dot, auto daemon respawn (stale-port detection), session resume, input bar restored on disconnect (no 30s fake-timeout)
-  - Unit tests `npm test` (244: 44 daemon_client + 19 conn-manager + 22 app-commands + 119 renderer smoke + 16 i18n + 7 integration + 3 commands + 5 build-config + 7 gui-state + 2 tool-group); RESPONSE_TYPES mirror daemon protocol verified against `daemon.py`
+  - Unit tests `npm test` (245: 44 daemon_client + 19 conn-manager + 22 app-commands + 120 renderer smoke + 16 i18n + 7 integration + 3 commands + 5 build-config + 7 gui-state + 2 tool-group); RESPONSE_TYPES mirror daemon protocol verified against `daemon.py`
 - **Scheduled tasks** — Task generalization + CRUD (rant 2026-08-12T18:23:15, #709/#710/#711)
   - Task handler generalized: `TaskHandler` (renamed from `EvolutionHandler`), repo-configured self-heal for any project, template lookup builtin → `~/.emrg/task-templates/<name>.md` → fallback
   - Daemon commands: `task_create/update/delete` + `task_template_create/list/update/delete` (tasks stored in `~/.emrg/tasks.yml`, custom type templates in `~/.emrg/task-templates/`)
@@ -119,7 +119,7 @@ pkill -f "emrg.server"; rm -f ~/.emrg/emrgd.port; python -m emrg
 ```
 
 Python: `uv run pytest tests/ -v` (804) — import check: `uv run python -c "from emrg.client.app import run_client"`
-GUI: `cd emrg/gui && npm test` (244: 44 daemon_client + 19 conn-manager + 22 app-commands + 119 renderer smoke + 16 i18n + 7 integration + 3 commands + 5 build-config + 7 gui-state + 2 tool-group) — syntax: `node --check main.js preload.js daemon_client.js renderer/js/*.js`
+GUI: `cd emrg/gui && npm test` (245: 44 daemon_client + 19 conn-manager + 22 app-commands + 120 renderer smoke + 16 i18n + 7 integration + 3 commands + 5 build-config + 7 gui-state + 2 tool-group) — syntax: `node --check main.js preload.js daemon_client.js renderer/js/*.js`
 CI: `uv run pytest` (ubuntu + **windows-2025 matrix** — Windows pytest 回归在 PR CI 即失败，v0.2.29 教训 #725) + GUI tests + **actionlint workflow lint** (`rhysd/actionlint@v1.7.12` gate, #444 — workflow 解析错误在 PR CI 即失败，如 `if:` secrets 上下文)
 Re-trigger: `scripts/re-trigger-ci.sh [branch]` (workflow_dispatch, #527 — 替代空 commit 重触发：Actions outage 会整段丢弃 push 事件，dispatch 走 API 路径不受影响)
 
diff --git a/emrg/gui/main.js b/emrg/gui/main.js
index c73c1e1d..d64e6629 100644
--- a/emrg/gui/main.js
+++ b/emrg/gui/main.js
@@ -375,6 +375,12 @@ vision = false
       const clean = String(title || "").trim().slice(0, 80); // 截断超长标题
       if (!clean) throw new Error("empty title");
       const frame = await requireConn().sendCommandAndWait("rename_session", { session_id: sessionId, cwd: projectDir, title: clean }, 5000);
+      // 跨项目会话重命名成功后立即同步侧边栏标题（rant 12:01:44）
+      const v = openSessions.get(sessionId);
+      if (v) {
+        v.title = frame.title || clean;
+        broadcastOpenSessions();
+      }
       return { ok: true, title: frame.title || clean };
     });
 
@@ -978,6 +984,19 @@ vision = false
       lastActive: new Date().toISOString(),
     });
     broadcastOpenSessions();
+    // 跨项目标题（rant 12:01:44）：异步拉该会话所在项目列表取 title——
+    // 找到则 v.title = s.title 并广播（失败/无 title → 保持 undefined → 侧边栏 sid 兜底）
+    listSessions(projectPath)
+      .then((sessions) => {
+        const v = openSessions.get(sid);
+        if (!v) return; // 会话已关闭/移除
+        const s = sessions.find((x) => x.session_id === sid);
+        if (s && s.title) {
+          v.title = s.title;
+          broadcastOpenSessions();
+        }
+      })
+      .catch(() => { /* 拉取失败保持 undefined → sid 兜底 */ });
   }
 
   // 激活会话变化（切换/新会话/发送）→ 更新 lastActive + activeSid → 防抖写盘
@@ -1084,7 +1103,7 @@ vision = false
 
   function openSessionsList() {
     return [...openSessions.entries()]
-      .map(([sid, v]) => ({ sid, projectName: v.projectName, projectPath: v.projectPath, lastActive: v.lastActive }))
+      .map(([sid, v]) => ({ sid, projectName: v.projectName, projectPath: v.projectPath, lastActive: v.lastActive, title: v.title }))
       .sort((a, b) => String(b.lastActive || "").localeCompare(String(a.lastActive || "")));
   }
 
@@ -1163,9 +1182,9 @@ vision = false
     });
   }
 
-  async function listSessions() {
+  async function listSessions(cwd = projectDir) {
     try {
-      const frame = await requireConn().sendCommandAndWait("list_sessions", { cwd: projectDir }, 5000);
+      const frame = await requireConn().sendCommandAndWait("list_sessions", { cwd }, 5000);
       return frame.sessions || [];
     } catch (e) {
       logger.warn(`[gui] list_sessions failed: ${e.message}`);
diff --git a/emrg/gui/renderer/js/sidebar.js b/emrg/gui/renderer/js/sidebar.js
index 595416c4..9c6b4525 100644
--- a/emrg/gui/renderer/js/sidebar.js
+++ b/emrg/gui/renderer/js/sidebar.js
@@ -27,7 +27,7 @@ const Sidebar = (() => {
     const known = (App.state && App.state.sessions) || [];
     for (const entry of openSessions) {
       const cur = known.find((s) => s.session_id === entry.sid) || {};
-      const title = cur.title || entry.sid; // G27：title 优先
+      const title = entry.title || cur.title || entry.sid; // entry.title 优先（跨项目），再 cur.title（当前项目），最后 sid
       const item = el("div", { class: "conv-item open-session-item" });
       item.dataset.sid = entry.sid;
       item.appendChild(el("span", { class: "conv-title" }, _t("sidebar.openSessionOf", { project: entry.projectName || "", title })));
diff --git a/emrg/gui/test/renderer.smoke.test.js b/emrg/gui/test/renderer.smoke.test.js
index ab1b9d2b..e65c0c1e 100644
--- a/emrg/gui/test/renderer.smoke.test.js
+++ b/emrg/gui/test/renderer.smoke.test.js
@@ -1913,6 +1913,30 @@ test("P4 s2: open_sessions 事件 → 渲染打开会话区（项目名/标题 +
   assert.strictEqual(els["open-sessions-label"].hidden, true, "label hidden when no open sessions");
 });
 
+test("P4 s2: 跨项目打开会话（entry.title 优先，state.sessions 无该 sid）→ 显示 entry.title 而非 sid", async () => {
+  const { ctx, els } = makeSandbox({});
+  await tick();
+  await vm.runInContext(
+    'App.state.sessionId = "sess-x";' +
+    'App.state.sessions = [{ session_id: "sess-local", title: "Local" }];' + // 当前项目会话；无 sess-x / sess-other
+    'App.handleEvent({ type: "open_sessions", data: { openSessions: [' + // main 已按 lastActive 倒序
+    '  { sid: "sess-x", projectName: "evolution", projectPath: "/p/evolution", lastActive: "t3", title: "Evolution Task" },' + // 跨项目 + title
+    '  { sid: "sess-other", projectName: "mem", projectPath: "/p/mem", lastActive: "t2" },' + // 跨项目无 title → sid 兜底
+    '  { sid: "sess-local", projectName: "emrg", projectPath: "/p/emrg", lastActive: "t1" }' + // 当前项目 → state.sessions title
+    '] } });',
+    ctx
+  );
+  const nav = els["open-sessions"];
+  assert.strictEqual(nav.children.length, 3, "three open-session items rendered");
+  const t0 = nav.children[0].children[0] || nav.children[0];
+  assert.ok((t0.textContent || "").includes("Evolution Task"), "cross-project entry shows entry.title");
+  assert.ok(!(t0.textContent || "").includes("sess-x"), "does NOT fall back to sid when entry.title present");
+  const t1 = nav.children[1].children[0] || nav.children[1];
+  assert.ok((t1.textContent || "").includes("sess-other"), "cross-project no title + not in state.sessions → sid fallback");
+  const t2 = nav.children[2].children[0] || nav.children[2];
+  assert.ok((t2.textContent || "").includes("Local"), "current-project entry still resolves via state.sessions title");
+});
+
 test("P4 s2: closeOpenSession 关闭激活会话 → 切到剩余打开会话 + 容器释放", async () => {
   let closed = null;
   const { ctx, els } = makeSandbox({