diff --git a/packages/core/src/agent.ts b/packages/core/src/agent.ts
index 4223adf..cf60604 100644
--- a/packages/core/src/agent.ts
+++ b/packages/core/src/agent.ts
@@ -181,7 +181,7 @@ export class Agent {
    */
   async createSession(opts: CreateSessionOptions = {}): Promise<Session> {
     // Model is validated first (before creating the Workspace, so failure leaves no
-    // temp directory behind): the reference must be the complete (provider, model_id)
+    // temporary workspace behind): the reference must be the complete (provider, model_id)
     // pair — the config's unique key — and must name an entry in the Project config; a
     // reference outside the config throws immediately rather than passing silently,
     // otherwise credentials, pricing, and the context window would all be unavailable.
@@ -217,7 +217,7 @@ export class Agent {
 
     // An explicit Workspace must already exist as a directory: if it
     // doesn't, throw rather than auto-create (to avoid a typo silently working in
-    // the wrong location); a temp Workspace is only created when unspecified.
+    // the wrong location); a temporary workspace is only created when unspecified.
     let workspaceDir: string;
     if (opts.workspaceDir) {
       workspaceDir = path.resolve(opts.workspaceDir);
@@ -226,7 +226,7 @@ export class Agent {
         stat = await fs.stat(workspaceDir);
       } catch {
         throw new Error(
-          `Workspace does not exist: ${workspaceDir}. Specify an existing directory, or omit the Workspace to use a temporary directory.`,
+          `Workspace does not exist: ${workspaceDir}. Specify an existing directory, or omit the Workspace to use a temporary workspace.`,
         );
       }
       if (!stat.isDirectory()) {
diff --git a/packages/core/src/internal/session-support.ts b/packages/core/src/internal/session-support.ts
index 3a4bd0e..5ffaac8 100644
--- a/packages/core/src/internal/session-support.ts
+++ b/packages/core/src/internal/session-support.ts
@@ -91,7 +91,7 @@ export async function createTempWorkspace(
   await fs.mkdir(base, { recursive: true });
   // The final directory must use a non-recursive mkdir: recursive mkdir succeeds
   // silently when the directory already exists, which would put a new Session into
-  // an existing temp Workspace; EEXIST means an id collision, so retry with a new id.
+  // an existing temporary workspace; EEXIST means an id collision, so retry with a new id.
   for (let attempt = 0; attempt < MAX_TMP_ID_ATTEMPTS; attempt++) {
     const dir = path.join(base, `tmp-${randomUUID().slice(0, 8)}`);
     try {
diff --git a/packages/core/src/state/project-config.ts b/packages/core/src/state/project-config.ts
index 3934709..c1fc4e3 100644
--- a/packages/core/src/state/project-config.ts
+++ b/packages/core/src/state/project-config.ts
@@ -128,7 +128,7 @@ export const DEFAULT_CHAT_THINKING_LEVELS: readonly DefaultChatThinkingLevel[] =
  * New-chat defaults (`[default_chat]`): per-Project prefill for newly created chats.
  * Every key is optional and independent:
  * - `agent_id`: the Agent preselected on the draft page (must name an existing Agent);
- * - `workspace`: the prefilled Workspace directory (absent/empty = auto temp directory);
+ * - `workspace`: the prefilled Workspace directory (absent/empty = a temporary workspace);
  * - `approval_mode`: the prefilled approval mode (absent = the built-in "allow-all");
  * - `thinking_level`: fallback thinking level for Agents whose config has no explicit
  *   `model.thinking_level` (see Agent's thinking-level resolution chain in agent.ts).
diff --git a/packages/core/test/agent.test.ts b/packages/core/test/agent.test.ts
index 05495bc..6b5d5fc 100644
--- a/packages/core/test/agent.test.ts
+++ b/packages/core/test/agent.test.ts
@@ -5,7 +5,7 @@
  * Regression: an explicitly given Workspace must be an existing directory. When it
  * does not exist, a clear error must be thrown rather than auto-creating it, and bash must not
  * be started with an invalid cwd after Session creation, which would throw a misleading
- * `spawn bash ENOENT`. A temp directory is only created when no Workspace is specified.
+ * `spawn bash ENOENT`. A temporary workspace is only created when no Workspace is specified.
  *
  * vault: the Agent vault's (agent_state/.vault.toml) **key names** are
  * injected into the assembled system prompt; values are never injected.
@@ -131,7 +131,7 @@ describe("Agent.createSession workspace handling", () => {
     const ws = path.join(tmpRoot, "ws-bad-model");
     await fs.mkdir(ws, { recursive: true });
     // A reference outside the config is not silently allowed (the unique key is provider +
-    // model_id); the error is thrown before creating the temp Workspace.
+    // model_id); the error is thrown before creating the temporary workspace.
     await expect(
       agent.createSession({
         workspaceDir: ws,
diff --git a/packages/core/test/workspace.test.ts b/packages/core/test/workspace.test.ts
index ce42330..44579b6 100644
--- a/packages/core/test/workspace.test.ts
+++ b/packages/core/test/workspace.test.ts
@@ -5,7 +5,7 @@
  *   `<agent>/workspaces/`.
  * - The id is checked for collisions within `workspaces/`: on conflict with an existing
  *   directory (EEXIST), it regenerates rather than reusing the existing directory; once
- *   retries are exhausted, it throws instead of silently falling back to an old temp Workspace.
+ *   retries are exhausted, it throws instead of silently falling back to an old temporary workspace.
  */
 import fs from "node:fs/promises";
 import os from "node:os";
diff --git a/packages/docs/content/server-api.en.md b/packages/docs/content/server-api.en.md
index 7923659..850842f 100644
--- a/packages/docs/content/server-api.en.md
+++ b/packages/docs/content/server-api.en.md
@@ -135,7 +135,7 @@ Schedule writes are owner-only. A task in new-Session mode carries `modelId` and
 | POST | /agents/:agentId/sessions | Create a Session: `{modelId?, provider?, workspace?, approvalMode?}` → 201 |
 | GET | /dirs?path= | Server-side directory browser (backs the Workspace picker) |
 
-On Session creation, `modelId` and `provider` are both-or-neither: send the complete pair to pick a model, or omit both to take the Project's default model — one without the other is a 400. The Workspace defaults to an auto-created temporary directory, and the approval mode defaults to `allow-all`.
+On Session creation, `modelId` and `provider` are both-or-neither: send the complete pair to pick a model, or omit both to take the Project's default model — one without the other is a 400. The Workspace defaults to an auto-created temporary workspace, and the approval mode defaults to `allow-all`.
 
 ### Usage and Traces (Agent Level)
 
diff --git a/packages/docs/content/server-api.zh.md b/packages/docs/content/server-api.zh.md
index b97ca3d..3cd94e1 100644
--- a/packages/docs/content/server-api.zh.md
+++ b/packages/docs/content/server-api.zh.md
@@ -135,7 +135,7 @@ Schedule 写操作仅限 Owner。新建 Session 模式的任务，`modelId` 与
 | POST | /agents/:agentId/sessions | 创建 Session：`{modelId?, provider?, workspace?, approvalMode?}` → 201 |
 | GET | /dirs?path= | 服务器端目录浏览（Workspace 选择器数据源） |
 
-创建 Session 时，`modelId` 与 `provider` 要么成对给出、要么都不给：给出完整二元组即指定模型，两个都省略则取 Project 默认模型，只给一个返回 400。Workspace 默认自动创建临时目录，审批模式默认 `allow-all`。
+创建 Session 时，`modelId` 与 `provider` 要么成对给出、要么都不给：给出完整二元组即指定模型，两个都省略则取 Project 默认模型，只给一个返回 400。Workspace 默认自动创建临时工作区，审批模式默认 `allow-all`。
 
 ### 用量与 Trace（Agent 级）
 
diff --git a/packages/docs/content/sessions-and-traces.en.md b/packages/docs/content/sessions-and-traces.en.md
index 543bb74..cc7bf75 100644
--- a/packages/docs/content/sessions-and-traces.en.md
+++ b/packages/docs/content/sessions-and-traces.en.md
@@ -13,7 +13,7 @@ Six levels: Project → Agent → Workspace → Session → Task → Request.
 | --- | --- |
 | Project | Top-level unit organizing Agents; owns the model and credential configuration; in the multi-user Web setup, users and Projects are many-to-many |
 | Agent | The executing subject; has exactly one Agent State (a persistent directory); one Agent can serve many Workspaces |
-| Workspace | The working directory of one run — the only file scope the model sees; an explicit `workspaceDir` must already exist, otherwise a temp Workspace `workspaces/tmp-<8hex>` is created |
+| Workspace | The working directory of one run — the only file scope the model sees; an explicit `workspaceDir` must already exist, otherwise a temporary Workspace `workspaces/tmp-<8hex>` is created |
 | Session | A continuous conversation under one (Agent, Workspace); model and Workspace are locked at Session creation; ids look like `session-YYYY-MM-DD-HH-mm-ss-<8hex>` |
 | Task | One execution goal started by one Prompt; consists of one or more consecutive Requests |
 | Request | One LLM API call: context and tool definitions in, streamed output out |
@@ -39,7 +39,7 @@ The data root is the `PENGUIN_HOME` environment variable, defaulting to `~/.peng
         │                             # convention, not a path the code creates, so tooling is
         │                             # installed once for any task; project dependencies stay
         │                             # in the project
-        ├── workspaces/               # temp Workspaces (tmp-<8hex>)
+        ├── workspaces/               # temporary Workspaces (tmp-<8hex>)
         ├── benchmarks/               # capability Benchmark cases and scores
         └── snapshots/                # Agent State version snapshots
 ```
diff --git a/packages/server/src/api/types.ts b/packages/server/src/api/types.ts
index 852d5a2..fc28d64 100644
--- a/packages/server/src/api/types.ts
+++ b/packages/server/src/api/types.ts
@@ -391,7 +391,7 @@ export interface DefaultModelResponse {
 export interface ChatDefaultsDto {
   /** Preselected Agent; must reference an existing Agent of the Project (400 unknown_agent). */
   agentId?: string;
-  /** Prefilled Workspace directory; absent/empty = auto temp directory. */
+  /** Prefilled Workspace directory; absent/empty = a temporary workspace. */
   workspace?: string;
   /** Prefilled approval mode; absent = the built-in "allow-all". */
   approvalMode?: ApprovalMode;
diff --git a/packages/server/src/http/routes/chat-defaults.ts b/packages/server/src/http/routes/chat-defaults.ts
index 1c69ddf..8966588 100644
--- a/packages/server/src/http/routes/chat-defaults.ts
+++ b/packages/server/src/http/routes/chat-defaults.ts
@@ -47,7 +47,7 @@ export function chatDefaultsRoutes(deps: AppDeps): Hono<AppEnv> {
     }
 
     // Not validated as an existing directory on purpose: the default is a prefill, and the
-    // directory is (re)checked when a Session is actually created. "" = clear (auto temp).
+    // directory is (re)checked when a Session is actually created. "" = clear (temporary workspace).
     const workspace = optionalString(body, "workspace", { maxLen: 4096, label: "workspace" });
     if (workspace !== undefined && workspace !== "") req.workspace = workspace;
 
diff --git a/packages/server/src/runtime/schedule-file.ts b/packages/server/src/runtime/schedule-file.ts
index 7db9d53..0f3779e 100644
--- a/packages/server/src/runtime/schedule-file.ts
+++ b/packages/server/src/runtime/schedule-file.ts
@@ -33,7 +33,7 @@ export interface ScheduleDefinition {
   endAtMs?: number;
   /** The target Session to bind to; defaults to creating a new Session each time. */
   sessionId?: string;
-  /** Workspace for new-Session mode (same semantics as manually starting a session; auto-creates a temp directory if unspecified). */
+  /** Workspace for new-Session mode (same semantics as manually starting a session; a temporary workspace is auto-created if unspecified). */
   workspace?: string;
   /** Model for new-Session mode (upstream id, always paired with provider; omit both for the Project's default reference). */
   modelId?: string;
diff --git a/packages/server/src/services/workspace-guard.ts b/packages/server/src/services/workspace-guard.ts
index d61eb4c..da6d9f0 100644
--- a/packages/server/src/services/workspace-guard.ts
+++ b/packages/server/src/services/workspace-guard.ts
@@ -8,7 +8,7 @@
  * reachability governed by the file permissions of the OS account running the
  * service.
  * When no Workspace is specified, this module isn't involved (the SDK creates its
- * own temporary directory).
+ * own temporary workspace).
  */
 import fs from "node:fs/promises";
 import { HttpError } from "../http/errors.js";
@@ -26,7 +26,7 @@ export async function assertWorkspaceAllowed(args: { workspace: string }): Promi
     throw new HttpError(
       400,
       "workspace_not_found",
-      `Workspace does not exist or is inaccessible: ${args.workspace}. Specify an existing directory, or leave it empty to use a temporary directory.`,
+      `Workspace does not exist or is inaccessible: ${args.workspace}. Specify an existing directory, or leave it empty to use a temporary workspace.`,
     );
   }
   const stat = await fs.stat(ws);
diff --git a/packages/server/test/session-index.test.ts b/packages/server/test/session-index.test.ts
index d901ea6..0526793 100644
--- a/packages/server/test/session-index.test.ts
+++ b/packages/server/test/session-index.test.ts
@@ -84,7 +84,7 @@ describe("session-index", () => {
     }
   });
 
-  it("creating a Session: auto temp Workspace by default, allow-all default, shows in the list", async () => {
+  it("creating a Session: temporary Workspace by default, allow-all default, shows in the list", async () => {
     await configureModels();
     const res = await api.post(base(), {});
     expect(res.status).toBe(201);
@@ -321,8 +321,8 @@ describe("session-index", () => {
     expect((await list("")).workspaceCounts).toBeUndefined();
 
     // The per-Workspace breakdown accompanies the totals and sums back to them: the
-    // subagent Session sits alone in its path; every other row lives in its own auto
-    // temp directory.
+    // subagent Session sits alone in its path; every other row lives in its own
+    // temporary workspace.
     const byWorkspace = full.workspaceCounts!;
     expect(byWorkspace["/tmp/w-sub"]).toEqual({
       active: 0,
diff --git a/packages/skills/skills/penguin-sdk/SKILL.md b/packages/skills/skills/penguin-sdk/SKILL.md
index 3e20a48..786d6d6 100644
--- a/packages/skills/skills/penguin-sdk/SKILL.md
+++ b/packages/skills/skills/penguin-sdk/SKILL.md
@@ -3,8 +3,8 @@ name: penguin-sdk
 description: Build AI apps on the Penguin Harness SDK — self-contained projects, the createSession/run streaming loop with thinking and image messages, and a complete RAG recipe that ingests documents into a knowledge base and answers with citations behind a web UI.
 short_description: Build AI and RAG apps on the Penguin Harness SDK.
 short_description_zh: 基于 Penguin SDK 构建 AI 与 RAG 应用。
-version: 18
-updated: 2026-07-30T11:10:00Z
+version: 19
+updated: 2026-08-06T00:00:00Z
 ---
 
 # Penguin Harness SDK
@@ -97,7 +97,7 @@ rl.close();
 session.dispose();
 ```
 
-- `createSession({ workspaceDir, provider, modelId })` — `workspaceDir` must already exist (omit for an auto temp dir); the model reference is the `(provider, modelId)` pair, so pass both to pick a configured model or neither for the project default — passing one alone throws.
+- `createSession({ workspaceDir, provider, modelId })` — `workspaceDir` must already exist (omit for a temporary workspace); the model reference is the `(provider, modelId)` pair, so pass both to pick a configured model or neither for the project default — passing one alone throws.
 - The `approve` callback gates every tool call; **omitting it denies everything**.
 - `opts.thinkingLevel` (`"none" | "low" | "medium" | "high" | "xhigh"`) overrides the agent's default (`model.thinking_level` in `system_config.yaml`) for this turn only — raise it for hard questions, drop it for latency-sensitive calls like titling or classification.
 - Session lifetime is the app's memory model: reuse one Session for a stateful chat (context accumulates, as above), create one per request for stateless QA (the RAG recipe below); either way call `session.dispose()` when done to release background processes.
diff --git a/packages/web/e2e/draft.spec.mjs b/packages/web/e2e/draft.spec.mjs
index 92ba191..8cd190b 100644
--- a/packages/web/e2e/draft.spec.mjs
+++ b/packages/web/e2e/draft.spec.mjs
@@ -4,7 +4,7 @@
  *   the first message is sent, and all four selections land faithfully in its meta;
  * - the draft auto-caches (body persisted via debounce): after a page reload, both the body and
  *   the selections are restored, and the cache clears once sending succeeds;
- * - the sidebar defaults to grouping by Workspace: auto temp directories merge into one
+ * - the sidebar defaults to grouping by Workspace: temporary workspaces merge into one
  *   "临时工作区" group, a named directory groups under its basename, and that group header's
  *   "+" pre-fills the draft's Workspace (via router state, applied once per navigation — a
  *   manual change made afterwards survives a reload instead of being re-overridden);
@@ -171,8 +171,11 @@ test("draft: pick model/approval -> reload restores them -> send creates the ses
   );
 
   // —— Default grouping: the sidebar groups Sessions by Workspace — the session just created
-  // used the auto temp directory, so it lands in the merged "临时工作区" group. ——
-  await expect(page.getByText("临时工作区")).toBeVisible();
+  // used an auto-created temporary workspace, so it lands in the merged "临时工作区" group.
+  // Scoped to the sidebar (<aside>): the draft page's Workspace pill reads 临时工作区 too
+  // (S.chat.workspaceAuto === S.chat.tempWorkspaces), so a page-wide text lookup would be
+  // ambiguous whenever both are on screen. ——
+  await expect(page.locator("aside").getByText("临时工作区", { exact: true })).toBeVisible();
 
   // A session in a named Workspace groups under that directory's basename, and its group
   // header's "+" pre-fills the draft's Workspace selection with the group's path.
@@ -242,7 +245,9 @@ test("draft: pick model/approval -> reload restores them -> send creates the ses
   // —— Pinning: the header's hover pin toggle lifts a group above the others in its mode and
   // persists per Project (localStorage penguin.sidebarPinnedGroups.<projectId>); order is
   // asserted geometrically, like layout.spec does for the login language buttons. ——
-  const tempLabel = page.getByText("临时工作区", { exact: true });
+  // Sidebar-scoped for the same reason as the group assertion above: the draft's Workspace
+  // pill would also read 临时工作区 whenever its selection is empty.
+  const tempLabel = page.locator("aside").getByText("临时工作区", { exact: true });
   const namedLabel = page.getByText(wsLabel, { exact: true });
   const yOf = async (locator) => (await locator.boundingBox())?.y ?? -1;
   // Unpinned baseline: the merged temp group sits below the named group.
diff --git a/packages/web/e2e/paging.spec.mjs b/packages/web/e2e/paging.spec.mjs
index b0a1918..b1b0b4d 100644
--- a/packages/web/e2e/paging.spec.mjs
+++ b/packages/web/e2e/paging.spec.mjs
@@ -46,8 +46,8 @@ test("sidebar shows 20 sessions plus a More row; More loads the 21st and then di
   });
   expect(put.ok(), "put models").toBeTruthy();
 
-  // Seed 21 sessions (each gets its own auto temp Workspace; the sidebar merges them into
-  // the single temp-workspace group, so the display cap applies to one group).
+  // Seed 21 sessions (each gets its own temporary Workspace; the sidebar merges them into
+  // the single temporary-workspace group, so the display cap applies to one group).
   for (let i = 0; i < TOTAL; i++) {
     const res = await page.request.post(
       `${BASE}/api/projects/${projectId}/agents/default_agent/sessions`,
diff --git a/packages/web/src/components/layout/app-layout.tsx b/packages/web/src/components/layout/app-layout.tsx
index 320625c..b2b22a8 100644
--- a/packages/web/src/components/layout/app-layout.tsx
+++ b/packages/web/src/components/layout/app-layout.tsx
@@ -8,6 +8,7 @@ import { useMemo, useState } from "react";
 import { NavLink, Outlet, useMatch, useNavigate } from "react-router";
 import { S } from "../../lib/strings";
 import { latestConversation } from "../../lib/session-grouping";
+import { useVersionInfo } from "../../lib/use-version-info";
 import { useAuth } from "../../state/auth";
 import { useProject } from "../../state/project";
 import { useSessions } from "../../state/sessions";
@@ -40,6 +41,14 @@ function CollapsedRail({ onExpand }: { onExpand: () => void }) {
   const navigate = useNavigate();
   const { agents, setCurrentAgentId } = useProject();
   const { sessions, loading } = useSessions();
+  /**
+   * Passive (active=false): never triggers a fetch — the rail mirrors whatever the lazy
+   * check has already learned (the pinned sidebar's dropdown or the draft page started it),
+   * matching the pinned sidebar's avatar dot. Cache pushes keep it live while mounted.
+   */
+  const { update } = useVersionInfo(false);
+  /** Same "named release only" gate as the pinned sidebar's update row (see sidebar.tsx). */
+  const newVersion = update?.updateAvailable === true ? (update.latestVersion ?? null) : null;
   const activeSessionId = useMatch("/chat/:sessionId")?.params.sessionId ?? null;
   /** On some conversation (any non-draft /chat/:id): the "you are here" state of the last-conversation entry. */
   const onConversation = activeSessionId !== null && activeSessionId !== DRAFT_SESSION_ID;
@@ -130,12 +139,27 @@ function CollapsedRail({ onExpand }: { onExpand: () => void }) {
       </nav>
       <button
         type="button"
-        title={`${user?.userId ?? ""} · ${S.nav.expandSidebar}`}
-        aria-label={user?.userId ?? S.auth.admin}
+        title={[user?.userId ?? "", S.nav.expandSidebar]
+          .concat(newVersion !== null ? [S.update.newVersion(newVersion)] : [])
+          .join(" · ")}
+        aria-label={
+          newVersion !== null
+            ? `${user?.userId ?? ""} · ${S.update.newVersion(newVersion)}`
+            : (user?.userId ?? S.auth.admin)
+        }
         onClick={onExpand}
-        className="mt-auto flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-gray-900 text-xs font-bold text-white dark:bg-gray-200 dark:text-gray-900"
+        className="relative mt-auto flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-gray-900 text-xs font-bold text-white dark:bg-gray-200 dark:text-gray-900"
       >
         {(user?.userId ?? "?").slice(0, 1).toUpperCase()}
+        {/* Update reminder dot, mirroring the pinned sidebar's avatar (same look, same
+            border trick against the rail background); the title/aria-label above name the
+            release, since the rail has no update row of its own. */}
+        {newVersion !== null && (
+          <span
+            aria-hidden
+            className="absolute -right-0.5 -top-0.5 h-2.5 w-2.5 rounded-full border-2 border-gray-50 bg-[var(--accent-bg)] dark:border-gray-900"
+          />
+        )}
       </button>
     </div>
   );
diff --git a/packages/web/src/components/layout/project-dialogs.tsx b/packages/web/src/components/layout/project-dialogs.tsx
index 39efaf5..9aa2340 100644
--- a/packages/web/src/components/layout/project-dialogs.tsx
+++ b/packages/web/src/components/layout/project-dialogs.tsx
@@ -619,7 +619,7 @@ function ChatDefaultsSection({ projectId, isOwner }: { projectId: string; isOwne
             <div className="sm:col-span-2">
               <FieldLabel>{S.chat.workspace}</FieldLabel>
               {/* The draft page's dir-browser pill: browse server directories, edit the path
-                  inline, or clear back to the auto temp directory. */}
+                  inline, or clear back to a temporary workspace. */}
               <WorkspaceSelect
                 projectId={projectId}
                 workspace={workspace}
diff --git a/packages/web/src/components/layout/sidebar.tsx b/packages/web/src/components/layout/sidebar.tsx
index 9ea4615..e91dec1 100644
--- a/packages/web/src/components/layout/sidebar.tsx
+++ b/packages/web/src/components/layout/sidebar.tsx
@@ -4,7 +4,7 @@
  * Trace) -> Session area with two grouping modes (a small toggle in the section header; the
  * choice and each Project's group collapse and pin state persist in localStorage): by Workspace
  * (the default; groups loaded Sessions by their
- * Workspace path, auto temp directories merged into one trailing group, header "+" starts a
+ * Workspace path, temporary workspaces merged into one trailing group, header "+" starts a
  * draft in that Workspace) or by Agent (group header = Agent name + new chat + Agent settings;
  * shows all Agents, including empty groups). Groups can be pinned via the header's hover pin
  * toggle: pinned groups sort before unpinned within their mode, keeping each partition's own
@@ -457,7 +457,7 @@ export function Sidebar({
    * chat" uses default_agent; this explicit intent overrides the previously selected Agent in
    * the draft cache (the rest of the draft content, such as the message body, is preserved).
    * The workspace-mode group header's "+" additionally carries that group's Workspace path
-   * ("" = the auto temp directory), pre-filling the draft's Workspace selection the same way.
+   * ("" = a temporary workspace), pre-filling the draft's Workspace selection the same way.
    */
   const newChat = (agentId?: string, workspace?: string) => {
     if (agentId) setCurrentAgentId(agentId);
@@ -909,7 +909,7 @@ export function Sidebar({
                   actions={
                     <>
                       <GroupPinButton pinned={pinned} onToggle={() => togglePin(group.key)} />
-                      {/* New chat in this Workspace: pre-fills the group's path in the draft ("" = auto temp directory); the Agent is the current one, falling back to default_agent */}
+                      {/* New chat in this Workspace: pre-fills the group's path in the draft ("" = temporary workspace); the Agent is the current one, falling back to default_agent */}
                       <button
                         type="button"
                         title={S.chat.newSessionInWorkspace}
@@ -949,13 +949,22 @@ export function Sidebar({
             <button
               type="button"
               onClick={() => setUserOpen(!userOpen)}
+              {...(newVersion !== null
+                ? {
+                    // The dot alone is mysterious: name the release on the trigger (hover
+                    // tooltip + accessible name), in the update row's exact wording.
+                    title: S.update.newVersion(newVersion),
+                    "aria-label": `${user?.userId ?? ""} · ${S.update.newVersion(newVersion)}`,
+                  }
+                : {})}
               className="flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-left transition-colors duration-150 hover:bg-gray-200/70 dark:hover:bg-gray-800"
             >
               <span className="relative flex h-7 w-7 shrink-0 items-center justify-center rounded-full bg-gray-900 text-xs font-bold text-white dark:bg-gray-200 dark:text-gray-900">
                 {(user?.userId ?? "?").slice(0, 1).toUpperCase()}
                 {/* Update reminder dot: only once the lazy check has actually run and found a
-                    newer release. The border (sidebar background color) separates it from the
-                    avatar for every accent — the neutral accent matches the avatar fill. */}
+                    newer release (the trigger button's tooltip/label above explains it). The
+                    border (sidebar background color) separates it from the avatar for every
+                    accent — the neutral accent matches the avatar fill. */}
                 {updateAvailable && (
                   <span
                     aria-hidden
diff --git a/packages/web/src/features/chat/draft-view.tsx b/packages/web/src/features/chat/draft-view.tsx
index 5b3b8c0..706327a 100644
--- a/packages/web/src/features/chat/draft-view.tsx
+++ b/packages/web/src/features/chat/draft-view.tsx
@@ -21,7 +21,7 @@
  * The sidebar group header "+" / menu "New conversation" explicitly specify an
  * Agent via route state (overriding the cached selection); the workspace-mode
  * group header "+" additionally carries a Workspace path pre-filling the
- * Workspace selection ("" = auto temp directory). A direct visit or refresh
+ * Workspace selection ("" = temporary workspace). A direct visit or refresh
  * falls back to the cache. When neither route state nor the mount-time cache claims a
  * field, the Project's new-chat defaults ([default_chat]) prefill Agent / Workspace /
  * approval mode (precedence: route state > draft cache > project default > built-in
@@ -256,7 +256,7 @@ export function DraftView({
 
   // Explicit Workspace from route state (the workspace-mode group header "+"): applied once per
   // location.key, same convention as the Agent above, overriding the cached selection ("" pre-fills
-  // the auto temp directory). Unlike the Agent there's no list to validate against, so this is a
+  // the temporary workspace). Unlike the Agent there's no list to validate against, so this is a
   // separate effect that never has to wait for a load.
   const stateWorkspace = routeState?.workspace;
   const appliedWorkspaceKey = useRef<string | null>(null);
@@ -276,7 +276,7 @@ export function DraftView({
   // Project defaults for Workspace / approval mode: the same apply-once discipline as the
   // route-state effects above, deferred until the defaults resolve. A field is only seeded
   // when nothing with higher precedence claims it — no route override (workspace only), no
-  // mount-time cached value (a cached "" workspace counts: it is an explicit "auto temp"),
+  // mount-time cached value (a cached "" workspace counts: it is an explicit temporary workspace),
   // and no user edit since mount. Model is deliberately not here (models.defaultModel
   // already flows through its own fallback effect below — the single-sourced default).
   const appliedProjectDefaults = useRef(false);
diff --git a/packages/web/src/features/chat/workspace-select.tsx b/packages/web/src/features/chat/workspace-select.tsx
index 09531f8..18bbbb0 100644
--- a/packages/web/src/features/chat/workspace-select.tsx
+++ b/packages/web/src/features/chat/workspace-select.tsx
@@ -30,7 +30,7 @@ export const pillClass =
 
 /**
  * Workspace selection (pill dropdown): the button shows the selected directory name (empty =
- * auto temporary directory). The menu browses server-side directories: **the current path can be
+ * a temporary workspace). The menu browses server-side directories: **the current path can be
  * edited directly** at the top (Enter/blur commits it, an invalid directory toasts and reverts
  * to the previous path), the list omits hidden directories, and the hint text sits at the bottom
  * of the menu; only loads on first expand. On narrow screens the menu docks to whichever side
@@ -157,7 +157,7 @@ export function WorkspaceSelect({
   };
 
   const trimmed = workspace.trim();
-  // Pill short name: the last segment of the directory name (root gives "/"); shows "auto temp directory" when empty.
+  // Pill short name: the last segment of the directory name (root gives "/"); shows "temporary workspace" when empty.
   const label = trimmed ? (trimmed.split("/").filter(Boolean).pop() ?? "/") : S.chat.workspaceAuto;
   const parentPath = dir?.parent ?? null;
   // Hidden directories (starting with .) are excluded from the list.
@@ -327,7 +327,7 @@ export function WorkspaceSelect({
             )}
           </ul>
         </div>
-        {/* When a directory has been specified, offer a one-click way back to the auto temp directory */}
+        {/* When a directory has been specified, offer a one-click way back to a temporary workspace */}
         {trimmed && (
           <button
             type="button"
diff --git a/packages/web/src/features/models/model-group-expansion.ts b/packages/web/src/features/models/model-group-expansion.ts
new file mode 100644
index 0000000..aad6d02
--- /dev/null
+++ b/packages/web/src/features/models/model-group-expansion.ts
@@ -0,0 +1,46 @@
+/**
+ * Expansion state for the models page's vendor groups (pure decisions, unit tested).
+ *
+ * The page stores the set of EXPANDED provider ids rather than collapsed ones: groups
+ * are derived only after the model rows load (user-defined groups arrive with that
+ * async response), so a collapsed-set default cannot express "everything collapsed
+ * except DeepSeek" without knowing every group id up front. An expanded set survives
+ * late-arriving groups — anything not in it simply renders collapsed. Not persisted,
+ * matching the previous collapse behavior.
+ */
+
+/**
+ * Provider ids expanded on first paint: DeepSeek only — the default model's provider and
+ * the first group in MODEL_PROVIDERS, so the page opens with exactly its top group
+ * unfolded. Returns a fresh Set per call (React state must never share a module-level
+ * mutable instance).
+ */
+export function defaultExpandedProviders(): Set<string> {
+  return new Set(["deepseek"]);
+}
+
+/**
+ * Whether a vendor group renders expanded. While a search query is active every group
+ * still rendered holds at least one match (groupModelRows drops matchless groups when
+ * searching), and a match hidden inside a collapsed group would look like a missing
+ * result — so searching forces groups open. Derived only: the stored set is untouched,
+ * and clearing the query restores the user's own expand/collapse choices.
+ */
+export function isGroupExpanded(
+  expanded: ReadonlySet<string>,
+  providerId: string,
+  searching: boolean,
+): boolean {
+  return searching || expanded.has(providerId);
+}
+
+/** Immutable toggle of one provider id in the expanded set (state-updater shape; the input set is never mutated). */
+export function toggleExpandedProvider(
+  expanded: ReadonlySet<string>,
+  providerId: string,
+): Set<string> {
+  const next = new Set(expanded);
+  if (next.has(providerId)) next.delete(providerId);
+  else next.add(providerId);
+  return next;
+}
diff --git a/packages/web/src/features/models/models-page.tsx b/packages/web/src/features/models/models-page.tsx
index b103d5f..d733a8f 100644
--- a/packages/web/src/features/models/models-page.tsx
+++ b/packages/web/src/features/models/models-page.tsx
@@ -71,6 +71,11 @@ import {
 } from "@prismshadow/penguin-core/model-catalog";
 import type { ModelProviderInfo } from "@prismshadow/penguin-core/model-catalog";
 import { groupModelRows, isFreeModel, sameModelRef, userProviderInfo } from "./model-grouping";
+import {
+  defaultExpandedProviders,
+  isGroupExpanded,
+  toggleExpandedProvider,
+} from "./model-group-expansion";
 import { clearDraftModelRef } from "../chat/draft-cache";
 import { syncRowsWithCatalog } from "./catalog-sync";
 import { tpsTone, ttftTone } from "./speed-test";
@@ -352,8 +357,12 @@ export function ModelsPage() {
   /** Target group (provider id) for adding a model: taken from the group header entry point, falling back to custom when empty. */
   const [addingTo, setAddingTo] = useState<string | null>(null);
   const [query, setQuery] = useState("");
-  /** Collapsed vendor groups (all expanded by default). */
-  const [collapsed, setCollapsed] = useState<Set<string>>(new Set());
+  /**
+   * Expanded vendor groups — only DeepSeek on first paint; every other group (including
+   * user-defined ones, which arrive with the async row load) starts collapsed. Searching
+   * force-opens the rendered groups without touching this set (see model-group-expansion.ts).
+   */
+  const [expanded, setExpanded] = useState<Set<string>>(defaultExpandedProviders);
   /** Vendor group (provider id) currently having its API key configured in bulk. */
   const [groupKeyFor, setGroupKeyFor] = useState<string | null>(null);
   /** "Add group" popup (user-defined group): a valid name proceeds to that group's add-model dialog. */
@@ -434,6 +443,8 @@ export function ModelsPage() {
   };
 
   const groups = useMemo(() => (rows ? groupModelRows(rows, query) : []), [rows, query]);
+  /** Non-empty search query: groups are filtered to matches and force-opened while it lasts. */
+  const searching = query.trim() !== "";
 
   /**
    * "Sync presets": merge the built-in catalog into the current table (union; the catalog
@@ -514,13 +525,15 @@ export function ModelsPage() {
 
   if (!projectId) return null;
 
-  const toggleGroup = (id: string) =>
-    setCollapsed((prev) => {
-      const next = new Set(prev);
-      if (next.has(id)) next.delete(id);
-      else next.add(id);
-      return next;
-    });
+  /**
+   * Header toggles are inert while searching: every rendered group is force-opened (see
+   * isGroupExpanded), so a flip would change nothing visibly and only silently mutate the
+   * state restored once the query clears.
+   */
+  const toggleGroup = (id: string) => {
+    if (searching) return;
+    setExpanded((prev) => toggleExpandedProvider(prev, id));
+  };
 
   return (
     <div className="h-full overflow-y-auto p-4 md:p-6">
@@ -571,7 +584,7 @@ export function ModelsPage() {
         ) : (
           <div className="space-y-3">
             {groups.map((group) => {
-              const open = !collapsed.has(group.provider.id);
+              const open = isGroupExpanded(expanded, group.provider.id, searching);
               return (
                 <section
                   key={group.provider.id}
diff --git a/packages/web/src/lib/session-grouping.ts b/packages/web/src/lib/session-grouping.ts
index 8f9d8e4..cd414d9 100644
--- a/packages/web/src/lib/session-grouping.ts
+++ b/packages/web/src/lib/session-grouping.ts
@@ -4,10 +4,10 @@
  * There is no Workspace entity on the server: a Session only carries the plain
  * filesystem path locked in at creation (SessionInfo.workspace), so grouping works
  * on those path strings. Sessions created without an explicit Workspace get an
- * auto-created temp directory shaped like `<agentDir>/workspaces/tmp-<8hex>`
+ * auto-created temporary workspace shaped like `<agentDir>/workspaces/tmp-<8hex>`
  * (packages/core/src/internal/session-support.ts, createTempWorkspace); each of
  * those is single-use, so per-path groups would be one-session noise — they are all
- * merged into ONE trailing "temp workspaces" group instead.
+ * merged into ONE trailing "temporary workspaces" group instead.
  */
 import type {
   SessionCategory,
@@ -15,16 +15,16 @@ import type {
   SessionInfo,
 } from "@prismshadow/penguin-server/api";
 
-/** Group key of the merged auto-temp group ("\0" can never appear in a filesystem path, so it never collides with a real Workspace). */
+/** Group key of the merged temporary-workspace group ("\0" can never appear in a filesystem path, so it never collides with a real Workspace). */
 export const TEMP_WORKSPACE_GROUP_KEY = "\0temp-workspaces";
 
-/** Auto-created temp Workspace tail: `workspaces/tmp-<8hex>` (either path separator; core supports win32). */
+/** Auto-created temporary Workspace tail: `workspaces/tmp-<8hex>` (either path separator; core supports win32). */
 const TEMP_WORKSPACE_RE = /[/\\]workspaces[/\\]tmp-[0-9a-f]{8}$/;
 
 /**
- * Whether a Session's Workspace is an auto-created temp directory. An empty path
- * also counts as "auto temp": the server always backfills the resolved path, so
- * this is defensive only.
+ * Whether a Session's Workspace is an auto-created temporary workspace. An empty
+ * path also counts as one: the server always backfills the resolved path, so this
+ * is defensive only.
  */
 export function isTempWorkspace(workspace: string): boolean {
   const p = workspace.trim();
@@ -114,10 +114,10 @@ export interface GroupCounts {
 
 /**
  * Folds the per-Agent per-Workspace-path category counts (SessionsResponse.workspaceCounts)
- * into workspace-mode groups, keyed like groupSessionsByWorkspace (exact path; auto-temp
- * paths merged into the temp group). The sidebar labels a group's folders and decides its
- * "More" from its own share — never from an Agent's other Workspaces, which would
- * advertise folders whose content lives in other groups.
+ * into workspace-mode groups, keyed like groupSessionsByWorkspace (exact path;
+ * temporary-workspace paths merged into the temp group). The sidebar labels a group's
+ * folders and decides its "More" from its own share — never from an Agent's other
+ * Workspaces, which would advertise folders whose content lives in other groups.
  */
 export function aggregateWorkspaceCounts(
   byAgent: ReadonlyMap<string, Readonly<Record<string, SessionCategoryCounts>>>,
@@ -179,7 +179,7 @@ export interface WorkspaceGroup<T = SessionInfo> {
   label: string;
   /** Full path for tooltips; null for the merged temp group (its members' paths all differ). */
   fullPath: string | null;
-  /** True for the merged auto-temp group. */
+  /** True for the merged temporary-workspace group. */
   temp: boolean;
   /** Member Sessions, newest first (createdAt desc). */
   sessions: T[];
diff --git a/packages/web/src/lib/strings-en.ts b/packages/web/src/lib/strings-en.ts
index 1eb9271..2198c7f 100644
--- a/packages/web/src/lib/strings-en.ts
+++ b/packages/web/src/lib/strings-en.ts
@@ -187,7 +187,7 @@ export const en: Strings = {
     chatDefaultsNotSet: "Not set",
     chatDefaultsApprovalNotSet: "Not set (defaults to allow all)",
     chatDefaultsThinkingNotSet: "Not set (follow the agent's config)",
-    chatDefaultsWorkspaceHint: "Empty = auto temp directory",
+    chatDefaultsWorkspaceHint: "Empty = temporary workspace",
     /** The model default is single-sourced with the Models page (the same default_model); this is just another entry point. */
     chatDefaultsModelHint: "Same default model as the Models page",
     deleteProject: "Delete Project",
@@ -512,7 +512,7 @@ export const en: Strings = {
     targetNew: "New session each time",
     targetSession: "Bound Session",
     sessionId: "Session id",
-    workspace: "Workspace (optional, auto-created when empty)",
+    workspace: "Workspace (optional; a temporary workspace is created when empty)",
     model: "Model",
     modelDefault: "Project default",
     deleteTitle: "Delete scheduled task",
@@ -608,13 +608,13 @@ export const en: Strings = {
     workspaceUseThis: "Use this dir",
     workspaceUp: "Parent dir",
     workspaceNoSubdirs: "No subdirectories",
-    workspaceAuto: "Auto temp directory",
-    workspaceClear: "Use auto temp directory instead",
+    workspaceAuto: "Temporary workspace",
+    workspaceClear: "Use a temporary workspace instead",
     workspaceDirInvalid: "Directory does not exist or is inaccessible; reverted",
     /** Sidebar conversation-list grouping toggle (workspace is the default) + workspace groups. */
     groupByWorkspace: "Group by workspace",
     groupByAgent: "Group by agent",
-    tempWorkspaces: "Temp workspaces",
+    tempWorkspaces: "Temporary workspaces",
     newSessionInWorkspace: "New chat in this workspace",
     draftSubtitle: "The self-evolving agent that excels at AI development tasks",
     /** Folder names for the draft page's collapsible examples (bookmark-style: exactly one open at a time). */
@@ -740,7 +740,7 @@ Scenarios:
     model: "Model",
     workspace: "Workspace",
     workspaceHint:
-      "Leave empty for an auto-created temp directory; if set, it must be an existing directory on the server",
+      "Leave empty for an auto-created temporary workspace; if set, it must be an existing directory on the server",
     approvalMode: "Approval mode",
     approvalModeNames: {
       "allow-all": "Approve everything",
diff --git a/packages/web/src/lib/strings.ts b/packages/web/src/lib/strings.ts
index e286588..f2b2476 100644
--- a/packages/web/src/lib/strings.ts
+++ b/packages/web/src/lib/strings.ts
@@ -180,7 +180,7 @@ export const zh = {
     chatDefaultsNotSet: "未设置",
     chatDefaultsApprovalNotSet: "未设置（默认全部放行）",
     chatDefaultsThinkingNotSet: "未设置（跟随智能体配置）",
-    chatDefaultsWorkspaceHint: "留空表示自动临时目录",
+    chatDefaultsWorkspaceHint: "留空表示使用临时工作区",
     /** 模型默认值与模型页同源（同一个 default_model），此处仅是另一处入口。 */
     chatDefaultsModelHint: "与模型页的默认模型同步",
     deleteProject: "删除 Project",
@@ -490,7 +490,7 @@ export const zh = {
     targetNew: "每次新建会话",
     targetSession: "绑定 Session",
     sessionId: "Session id",
-    workspace: "Workspace（可选，留空自动创建）",
+    workspace: "Workspace（可选，留空自动创建临时工作区）",
     model: "Model",
     modelDefault: "Project 默认",
     deleteTitle: "删除定时任务",
@@ -585,8 +585,8 @@ export const zh = {
     workspaceUseThis: "使用此目录",
     workspaceUp: "上级目录",
     workspaceNoSubdirs: "无子目录",
-    workspaceAuto: "自动临时目录",
-    workspaceClear: "改用自动临时目录",
+    workspaceAuto: "临时工作区",
+    workspaceClear: "改用临时工作区",
     workspaceDirInvalid: "目录不存在或无法访问，已回退",
     /** 侧栏对话列表的分组切换（默认按工作区）与工作区分组。 */
     groupByWorkspace: "按工作区分组",
@@ -717,7 +717,7 @@ Benchmark：
     defaultSessionTitle: "新对话",
     model: "Model",
     workspace: "Workspace",
-    workspaceHint: "留空自动创建临时目录；指定时必须是服务器上已存在的目录",
+    workspaceHint: "留空自动创建临时工作区；指定时必须是服务器上已存在的目录",
     approvalMode: "审批模式",
     /** Short description (the trigger button shows only the description, not the mode id). */
     approvalModeNames: {
diff --git a/packages/web/src/lib/use-version-info.ts b/packages/web/src/lib/use-version-info.ts
index 970d342..7aaedea 100644
--- a/packages/web/src/lib/use-version-info.ts
+++ b/packages/web/src/lib/use-version-info.ts
@@ -20,14 +20,21 @@ let updateCache: UpdateCheckResponse | null = null;
 let updatePromise: Promise<UpdateCheckResponse> | null = null;
 
 /**
- * Mounted hooks subscribe here so forceUpdateCheck (the sidebar's manual "check for
- * updates" action) can push its fresh result to every consumer at once — the footer,
- * the update dot, the reminder rows, and the draft page's version line all react
- * without a remount. The lazy fetch path doesn't need this (each hook awaits the
- * shared promise itself); only an out-of-band refresh does.
+ * Mounted hooks subscribe here so any refresh of the module cache reaches every
+ * consumer at once — the footer, the update dots, the reminder rows, and the draft
+ * page's version line all react without a remount. Two paths push: forceUpdateCheck
+ * (the sidebar's manual "check for updates" action) and the lazy fetch resolving.
+ * Active hooks await the shared promise themselves, but passive ones (active=false,
+ * e.g. the collapsed rail's avatar dot) only ever read the cache — without the lazy
+ * push they would miss a result that lands while they are mounted.
  */
 const listeners = new Set<() => void>();
 
+/** Pushes the current module cache to every mounted hook (see the listeners comment). */
+function notifyAll(): void {
+  for (const notify of listeners) notify();
+}
+
 /** How one manual update check ended, for user feedback — exactly one notice per outcome. */
 export type UpdateCheckOutcome =
   | { kind: "disabled" }
@@ -79,6 +86,7 @@ export function useVersionInfo(active: boolean): VersionInfo {
 
     versionPromise ??= api.getVersion().then((res) => {
       versionCache = res;
+      notifyAll();
       return res;
     });
     versionPromise
@@ -91,6 +99,7 @@ export function useVersionInfo(active: boolean): VersionInfo {
 
     updatePromise ??= api.checkUpdate().then((res) => {
       updateCache = res;
+      notifyAll();
       return res;
     });
     updatePromise
@@ -130,6 +139,6 @@ export async function forceUpdateCheck(): Promise<UpdateCheckResponse> {
     if (updatePromise === promise) updatePromise = null;
     throw e;
   } finally {
-    for (const notify of listeners) notify();
+    notifyAll();
   }
 }
diff --git a/packages/web/test/model-group-expansion.test.ts b/packages/web/test/model-group-expansion.test.ts
new file mode 100644
index 0000000..b432262
--- /dev/null
+++ b/packages/web/test/model-group-expansion.test.ts
@@ -0,0 +1,89 @@
+/**
+ * model-group-expansion.ts unit tests: the models page's default-collapsed vendor groups.
+ * Only DeepSeek (the catalog's first provider) is expanded on first paint; the state is a
+ * set of EXPANDED ids so groups arriving late (user-defined groups load with the rows)
+ * default to collapsed without being known up front. While a search query is active every
+ * rendered group is force-opened — groupModelRows only returns match-holding groups when
+ * searching, and a match hidden inside a collapsed group would look like a missing result —
+ * without touching the stored set.
+ */
+import { describe, expect, it } from "vitest";
+import { MODEL_PROVIDERS } from "@prismshadow/penguin-core/model-catalog";
+import {
+  defaultExpandedProviders,
+  isGroupExpanded,
+  toggleExpandedProvider,
+} from "../src/features/models/model-group-expansion";
+import { groupModelRows } from "../src/features/models/model-grouping";
+import type { ModelRowLike } from "../src/features/models/model-grouping";
+
+describe("defaultExpandedProviders", () => {
+  it("contains exactly deepseek, the first provider of the catalog", () => {
+    expect([...defaultExpandedProviders()]).toEqual(["deepseek"]);
+    // The default leans on the catalog ordering promise (DeepSeek first): pin it here so a
+    // reordering shows up as this failure instead of a silently odd default.
+    expect(MODEL_PROVIDERS[0]?.id).toBe("deepseek");
+  });
+
+  it("returns a fresh set per call (React state must not share one mutable instance)", () => {
+    const a = defaultExpandedProviders();
+    const b = defaultExpandedProviders();
+    expect(a).not.toBe(b);
+    a.add("openai");
+    expect(b.has("openai")).toBe(false);
+  });
+});
+
+describe("isGroupExpanded", () => {
+  const expanded = defaultExpandedProviders();
+
+  it("without a search query, only members of the expanded set are open", () => {
+    expect(isGroupExpanded(expanded, "deepseek", false)).toBe(true);
+    expect(isGroupExpanded(expanded, "anthropic", false)).toBe(false);
+    expect(isGroupExpanded(expanded, "custom", false)).toBe(false);
+    // User-defined groups are decided by the same membership rule — collapsed until toggled.
+    expect(isGroupExpanded(expanded, "my-proxy", false)).toBe(false);
+  });
+
+  it("while searching, every group is open regardless of the stored set", () => {
+    expect(isGroupExpanded(expanded, "anthropic", true)).toBe(true);
+    expect(isGroupExpanded(new Set(), "deepseek", true)).toBe(true);
+  });
+
+  it("force-open covers each group a search actually renders (the hidden-results regression)", () => {
+    const rows: ModelRowLike[] = [
+      { provider: "deepseek", modelId: "deepseek-chat" },
+      { provider: "anthropic", modelId: "claude-sonnet-4-6", displayName: "Claude Sonnet 4.6" },
+      { provider: "moonshot", modelId: "kimi-k2.6", displayName: "Kimi K2.6" },
+      { provider: "my-proxy", modelId: "kimi-mirror" },
+    ];
+    // "kimi" matches inside groups that default to collapsed (moonshot + a user-defined one):
+    // with the query active each rendered group must derive as open.
+    const groups = groupModelRows(rows, "kimi");
+    expect(groups.length).toBeGreaterThan(0);
+    for (const g of groups) {
+      expect(isGroupExpanded(defaultExpandedProviders(), g.provider.id, true)).toBe(true);
+    }
+    // Clearing the query falls back to the stored set: the same groups collapse again.
+    for (const g of groups) {
+      expect(isGroupExpanded(defaultExpandedProviders(), g.provider.id, false)).toBe(
+        g.provider.id === "deepseek",
+      );
+    }
+  });
+});
+
+describe("toggleExpandedProvider", () => {
+  it("adds an absent id and removes a present one, without mutating the input", () => {
+    const initial = defaultExpandedProviders();
+    const withAnthropic = toggleExpandedProvider(initial, "anthropic");
+    expect(withAnthropic.has("anthropic")).toBe(true);
+    expect(withAnthropic.has("deepseek")).toBe(true);
+    expect(initial.has("anthropic")).toBe(false); // input untouched (React state discipline)
+
+    const withoutDeepseek = toggleExpandedProvider(withAnthropic, "deepseek");
+    expect(withoutDeepseek.has("deepseek")).toBe(false);
+    expect(withoutDeepseek.has("anthropic")).toBe(true);
+    expect(withAnthropic.has("deepseek")).toBe(true);
+  });
+});
diff --git a/packages/web/test/session-grouping.test.ts b/packages/web/test/session-grouping.test.ts
index a5db6c0..bedfb9a 100644
--- a/packages/web/test/session-grouping.test.ts
+++ b/packages/web/test/session-grouping.test.ts
@@ -2,7 +2,7 @@
  * Workspace grouping for the chat sidebar (pure logic):
  * - named Workspaces group by exact path, labeled by basename (full path kept for
  *   tooltips), newest group first;
- * - auto temp Workspaces (`<agentDir>/workspaces/tmp-<8hex>`, the shape produced by
+ * - temporary Workspaces (`<agentDir>/workspaces/tmp-<8hex>`, the shape produced by
  *   core's createTempWorkspace) are all merged into ONE trailing temp group — an
  *   empty path (defensive; the server always backfills the resolved dir) counts too;
  * - sessions inside every group are re-sorted newest first: the flat store list
@@ -58,7 +58,7 @@ function session(
 const TEMP_A = "/data/proj/agents/default_agent/workspaces/tmp-1a2b3c4d";
 const TEMP_B = "/data/proj/agents/agent_helper/workspaces/tmp-00ff00aa";
 
-describe("isTempWorkspace (auto temp directory pattern from core's createTempWorkspace)", () => {
+describe("isTempWorkspace (temporary-workspace pattern from core's createTempWorkspace)", () => {
   it("matches <...>/workspaces/tmp-<8hex> with either path separator, and the empty path", () => {
     expect(isTempWorkspace(TEMP_A)).toBe(true);
     expect(isTempWorkspace("C:\\pg\\data\\proj\\agents\\a\\workspaces\\tmp-00ff00aa")).toBe(true);
@@ -74,7 +74,7 @@ describe("isTempWorkspace (auto temp directory pattern from core's createTempWor
     expect(isTempWorkspace("/x/workspaces/tmp-XYZWQPRS")).toBe(false);
     expect(isTempWorkspace("/x/workspaces/tmp-1a2b3c4")).toBe(false);
     expect(isTempWorkspace("/x/workspaces/tmp-1a2b3c4d5")).toBe(false);
-    // a subdirectory below a temp Workspace is not itself the temp Workspace
+    // a subdirectory below a temporary workspace is not itself the temporary workspace
     expect(isTempWorkspace(`${TEMP_A}/nested`)).toBe(false);
   });
 });
@@ -115,7 +115,7 @@ describe("groupSessionsByWorkspace", () => {
     expect(groups[0]!.sessions.map((s) => s.sessionId)).toEqual([a2.sessionId, a1.sessionId]);
   });
 
-  it("merges every temp Workspace into one trailing group, after named groups sorted by newest session", () => {
+  it("merges every temporary Workspace into one trailing group, after named groups sorted by newest session", () => {
     const oldAlpha = session("/srv/alpha", "2026-07-01T10:00:00.000Z");
     const newAlpha = session("/srv/alpha", "2026-07-06T10:00:00.000Z");
     const beta = session("/srv/beta", "2026-07-05T10:00:00.000Z");
@@ -276,7 +276,7 @@ describe("aggregateWorkspaceCounts (per-group exact server share)", () => {
     expect(aggregateWorkspaceCounts(new Map()).size).toBe(0);
   });
 
-  it("folds every auto-temp path into the merged temp group, deduplicating agents", () => {
+  it("folds every temporary-workspace path into the merged temp group, deduplicating agents", () => {
     const byAgent = new Map([
       [
         "agent_a",