src/api.ts

@@ -117,6 +117,7 @@ export const api = {
 	explainSystemAction: (action: string) => auth.fetch(`${BASE}/api/authz/explain?action=${encodeURIComponent(action)}`).then(r => json<{ allowed: boolean; actionId: string; source?: string; reason?: string; authorityEpoch: number }>(r)),
   listProjects: (signal?: AbortSignal) => auth.fetch(`${BASE}/api/projects`, signal ? { signal } : undefined).then(r => json<Project[]>(r)),
   createProject: (name: string) => auth.fetch(`${BASE}/api/projects`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ name }) }).then(r => json<Project>(r)),
+  createScratchSession: (title?: string) => auth.fetch(`${BASE}/api/scratch-sessions`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(title ? { title } : {}) }).then(r => json<{ project: Project; conversation: Conversation }>(r)),
   renameProject: (id: string, name: string) => auth.fetch(`${BASE}/api/projects/${id}`, { method: 'PATCH', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ name }) }).then(r => json<Project>(r)),
   deleteProject: (id: string) => auth.fetch(`${BASE}/api/projects/${id}`, { method: 'DELETE' }).then(checked),
 

src/components/Conversation.tsx

@@ -637,14 +637,14 @@ function ConversationSession() {
           {profiles.map(p => <option key={p.id} value={p.id}>{p.name}</option>)}
         </select>
         </label>
-        <div className="companion-setting"><span>读取同项目的其他对话</span><button className="btn ghost"
+        {!conversation?.scratch && <div className="companion-setting"><span>读取同项目的其他对话</span><button className="btn ghost"
           title={conversation?.allowCrossRead === false
             ? '本会话不读取其他会话记录（点击开启）'
             : '本会话可读取同项目其他会话记录（需项目设置开启跨会话读取；点击关闭）'}
           onClick={() => currentConvId && store.setCrossFlags(currentConvId, { allowCrossRead: conversation?.allowCrossRead === false })}>
           {conversation?.allowCrossRead === false ? '关闭' : '允许'}
         </button>
-        <span className="companion-setting-note">实际读取范围还需项目设置允许</span></div>
+        <span className="companion-setting-note">实际读取范围还需项目设置允许</span></div>}
         <label className="companion-setting"><span>这次工作的要求</span><SessionNoteField convId={currentConvId} note={conversation?.sessionNote ?? ''} /></label>
         </Collapsible>
         <span title={connected ? '已连接' : '正在重新连接'} className={`conn-dot ${connected ? 'on' : 'off'}`} />

src/components/ConversationWork.tsx

@@ -10,6 +10,7 @@ export function ConversationWork() {
   const cards = useStore(s => s.cards)
   const conversationId = useStore(s => s.currentConvId)
   const projectId = useStore(s => s.currentProjectId)
+  const scratch = useStore(s => !!s.tasks.find(t => t.id === s.currentConvId)?.scratch)
   const messages = useStore(s => s.messages)
   const actionStates = useStore(s => s.cardActionStates)
   const rightCollapsed = useStore(s => s.ui.rightCollapsed)
@@ -56,7 +57,7 @@ export function ConversationWork() {
     onPin: (card: ActivityCard, pinned: boolean) => { void store.cardPin(card, pinned) },
     onDismiss: (card: ActivityCard) => { void store.cardDismiss(card) },
     onLocate: (card: ActivityCard) => { store.locateMessage(card.anchorMessageId) },
-    onArchive: (card: ActivityCard) => { void store.cardToProject(card) },
+    ...(scratch ? {} : { onArchive: (card: ActivityCard) => { void store.cardToProject(card) } }),
   }
   const view = (card: ActivityCard) => <ActivityCardView key={card.id} card={card} callbacks={callbacks} docBridge={docBridge} />
 

src/components/TaskSidebar.tsx

@@ -55,6 +55,7 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
   const artifacts = useStore(s => s.artifacts)
   const currentConvId = useStore(s => s.currentConvId)
   const currentProjectId = useStore(s => s.currentProjectId)
+  const scratchMode = useStore(s => !!s.scratchMode)
   const showArchived = useStore(s => s.ui.showArchived)
   const serverWorkspaces = useStore(s => s.serverWorkspaces)
   /** 审计入口能力门控（增量 2）：命令面探测通过才展示「追溯审计」。 */
@@ -74,13 +75,15 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
 
   const createConversation = async (projectId?: string) => {
     try {
+      if (projectId && scratchMode) await store.openProject(projectId)
       await store.createTask(projectId)
       onConversationOpen?.()
     } catch { /* store owns the actionable failure toast */ }
   }
 
   const tools = buildWorkspaceEntries(serverWorkspaces, { rdmAudit: rdmAuditAvailable, rdmCockpit: rdmCockpitAvailable })
-  const visible = filterTasks(tasks.filter(t => t.projectId === currentProjectId), q)
+  const scratchTasks = tasks.filter(t => t.scratch)
+  const visible = filterTasks(scratchMode ? scratchTasks : tasks.filter(t => t.projectId === currentProjectId && !t.scratch), q)
   const pinned = visible.filter(t => t.pinned)
   const rest = visible.filter(t => !t.pinned)
   const currentProject = projects.find(p => p.id === currentProjectId)
@@ -99,10 +102,10 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
       <button className="tsb-row-act" title={t.archived ? '恢复' : '归档'} onClick={e => { e.stopPropagation(); store.archiveTask(t.id, !t.archived) }}>
         <Icon name={t.archived ? 'undo' : 'archive'} size={13} />
       </button>
-      <button className={`tsb-row-act ${t.crossPrivate ? 'active' : ''}`} title={t.crossPrivate ? '私有会话：不被其他会话读取（点击取消）' : '设为私有（不被其他会话读取）'}
+      {!t.scratch && <button className={`tsb-row-act ${t.crossPrivate ? 'active' : ''}`} title={t.crossPrivate ? '私有会话：不被其他会话读取（点击取消）' : '设为私有（不被其他会话读取）'}
         onClick={e => { e.stopPropagation(); store.setCrossFlags(t.id, { crossPrivate: !t.crossPrivate }) }}>
         <Icon name="shield" size={13} />
-      </button>
+      </button>}
     </span>
   )
 
@@ -121,7 +124,7 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
       <button className="tsb-task-open" onClick={() => { store.openTask(t.id); onConversationOpen?.() }}>
         <Icon name="message" size={14} />
         <span className="tsb-task-t" title={t.title}>{t.title || '未命名对话'}</span>
-        {t.crossPrivate && <span className="tsb-pbadge" title="私有：不被其他会话读取"><Icon name="shield" size={11} /></span>}
+        {t.crossPrivate && !t.scratch && <span className="tsb-pbadge" title="私有：不被其他会话读取"><Icon name="shield" size={11} /></span>}
         <span className="tsb-task-tm">{relativeTime(t.updatedAt)}</span>
       </button>
       {rowActions(t)}
@@ -136,9 +139,9 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
       <div className="tsb-brand">
         <button className="tsb-projrow" title="切换项目"
           onClick={e => { const el = e.currentTarget; setMenu(m => m?.kind === 'project' ? null : { kind: 'project', anchor: el }) }}>
-          <Icon name="folder" size={15} />
-          <span className="tsb-projrow-name">{currentProject?.name ?? '选择项目'}</span>
-          {stage && <span className="tsb-projrow-stage">{stage}</span>}
+          <Icon name={scratchMode ? 'message' : 'folder'} size={15} />
+          <span className="tsb-projrow-name">{scratchMode ? '无项目对话' : currentProject?.name ?? '选择项目'}</span>
+          {stage && !scratchMode && <span className="tsb-projrow-stage">{stage}</span>}
           <span className="tsb-user-chev"><Icon name="chevron-down" size={13} /></span>
         </button>
         <button className="tsb-iconbtn" title="收起侧栏（⌘B）" onClick={onCollapse}><Icon name="panel-left" /></button>
@@ -147,7 +150,8 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
       {/* 主入口创建会话；项目创建保留在次级菜单。 */}
       <div className="tsb-actions">
         <div className="tsb-newtask">
-          <button className="tsb-newtask-main" disabled={noProjects} title={noProjects ? emptyProjectsNotice(projectsLoaded, canCreate) : '在当前项目新建对话（⌘N）'}
+          <button className="tsb-newtask-main" disabled={noProjects && !scratchMode}
+            title={scratchMode ? '新建无项目对话（⌘N）' : noProjects ? emptyProjectsNotice(projectsLoaded, canCreate) : '在当前项目新建对话（⌘N）'}
             onClick={() => createConversation()}>
             <Icon name="plus" size={15} />新建对话
           </button>
@@ -156,12 +160,12 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
         </div>
         <div className="tsb-search">
           <Icon name="search" size={14} />
-          <input aria-label="搜索本项目会话" placeholder="搜索对话…" value={q} onChange={e => setQ(e.target.value)} />
+          <input aria-label={scratchMode ? '搜索无项目对话' : '搜索本项目会话'} placeholder="搜索对话…" value={q} onChange={e => setQ(e.target.value)} />
         </div>
       </div>
 
       <div className="tsb-orgrow">
-        <span className="tsb-seclabel" style={{ padding: 0 }}>本项目会话</span>
+        <span className="tsb-seclabel" style={{ padding: 0 }}>{scratchMode ? '无项目对话' : '本项目会话'}</span>
         <span style={{ flex: 1 }} />
         <button className={`tsb-iconbtn ${showArchived ? 'active' : ''}`} title={showArchived ? '隐藏归档' : '查看归档'}
           onClick={() => { store.setUI({ showArchived: !showArchived }); store.refreshTasks(!showArchived) }}><Icon name="archive" size={15} /></button>
@@ -195,7 +199,8 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
         )}
 
         {rest.length === 0 && pinned.length === 0 && (
-          <div className="tsb-empty">{noProjects ? emptyProjectsNotice(projectsLoaded, canCreate)
+          <div className="tsb-empty">{scratchMode ? '开始一个通用对话；无项目对话彼此独立，不会使用项目文档与知识。'
+            : noProjects ? emptyProjectsNotice(projectsLoaded, canCreate)
             : workError ?? '从「新建对话」开始，描述你想完成的工作。'}</div>
         )}
         {rest.map(t => taskRow(t))}
@@ -215,7 +220,7 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
             <kbd>{entry.shortcut}</kbd>
           </button>
         ))}
-        {currentProject && (
+        {currentProject && !scratchMode && (
           <button className="tsb-tool" onClick={() => store.openProjectSettings(currentProject.id)}>
             <span className="tsb-tool-icon"><Icon name="settings" size={14} /></span>
             <span className="tsb-tool-name">项目设置</span>
@@ -239,6 +244,10 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
 
       {/* 弹出菜单们 */}
       <Menu anchor={menu?.kind === 'project' ? menu.anchor : null} onClose={() => setMenu(null)}>
+        <MenuItem icon="message" onClick={() => { void store.enterScratchMode(); onConversationOpen?.(); setMenu(null) }}>
+          无项目对话
+          <kbd>{scratchMode ? '当前 · ' : ''}{scratchTasks.filter(t => !t.archived).length} 会话</kbd>
+        </MenuItem>
         {projects.map(p => {
           const count = tasks.filter(t => t.projectId === p.id && !t.archived).length
           const pstage = projectStateLabel(p.settings) ?? projectStage(p.settings)
@@ -246,7 +255,7 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
           return (
             <MenuItem key={p.id} icon="folder" onClick={() => { switchProject(p.id); setMenu(null) }}>
               {p.name}
-              <kbd>{p.id === currentProjectId ? '当前 · ' : pstage ? `${pstage} · ` : ''}{mine ? '我创建 · ' : ''}{count} 会话</kbd>
+              <kbd>{p.id === currentProjectId && !scratchMode ? '当前 · ' : pstage ? `${pstage} · ` : ''}{mine ? '我创建 · ' : ''}{count} 会话</kbd>
             </MenuItem>
           )
         })}
@@ -258,12 +267,14 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
       </Menu>
 
       <Menu anchor={menu?.kind === 'new' ? menu.anchor : null} onClose={() => setMenu(null)}>
-        {!noProjects && <MenuItem icon="plus" onClick={() => { createConversation(); setMenu(null) }}>新建对话 · 当前项目<kbd>⌘N</kbd></MenuItem>}
+        {scratchMode
+          ? <MenuItem icon="message" onClick={() => { createConversation(); setMenu(null) }}>新建无项目对话<kbd>⌘N</kbd></MenuItem>
+          : !noProjects && <MenuItem icon="plus" onClick={() => { createConversation(); setMenu(null) }}>新建对话 · 当前项目<kbd>⌘N</kbd></MenuItem>}
         {canCreate && <>
           <div className="tsb-menu-div" />
           <MenuItem icon="folder" onClick={() => { setCreatingProject(true); setMenu(null) }}>新建项目…</MenuItem>
         </>}
-        {noProjects && !canCreate && <div className="tsb-tool-note">{emptyProjectsNotice(projectsLoaded, canCreate)}</div>}
+        {noProjects && !canCreate && !scratchMode && <div className="tsb-tool-note">{emptyProjectsNotice(projectsLoaded, canCreate)}</div>}
         {projects.filter(p => p.id !== currentProjectId).slice(0, 6).map(p => (
           <MenuItem key={p.id} onClick={() => { createConversation(p.id); setMenu(null) }}>在「{p.name}」新建对话</MenuItem>
         ))}
@@ -273,6 +284,8 @@ export function TaskSidebar({ onCollapse = store.toggleLeft, onConversationOpen,
         {rowTask && <>
           <MenuItem icon="pin" onClick={() => { store.pinTask(rowTask.id, !rowTask.pinned); setMenu(null) }}>{rowTask.pinned ? '取消置顶' : '置顶'}</MenuItem>
           <MenuItem icon={rowTask.archived ? 'undo' : 'archive'} onClick={() => { store.archiveTask(rowTask.id, !rowTask.archived); setMenu(null) }}>{rowTask.archived ? '恢复（移出归档）' : '归档'}</MenuItem>
+        </>}
+        {rowTask && !rowTask.scratch && <>
           <div className="tsb-menu-div" />
           <MenuItem icon="shield" onClick={() => { store.setCrossFlags(rowTask.id, { crossPrivate: !rowTask.crossPrivate }); setMenu(null) }}>{rowTask.crossPrivate ? '取消私有（可被其他会话读取）' : '设为私有（不被其他会话读取）'}</MenuItem>
           <MenuItem icon="users" onClick={() => { store.setCrossFlags(rowTask.id, { allowCrossRead: rowTask.allowCrossRead === false }); setMenu(null) }}>{rowTask.allowCrossRead === false ? '开启读取其他会话' : '关闭读取其他会话'}</MenuItem>

src/components/Workbench.tsx

@@ -22,7 +22,8 @@ export const docBridge: DocBridge = {
   },
 }
 
-const inboxCallbacks = {
+// 无项目对话（scratch）没有可留档的项目：只用不含 onArchive 的回调。
+const scratchInboxCallbacks = {
   onAction: (c: ActivityCard, id: string, payload?: WorkCardAction) => store.cardAction(c, id, payload),
   onOpenRecord: (c: ActivityCard) => store.openWorkRecord(c),
   onReference: (c: ActivityCard) => store.referenceWork(c),
@@ -30,8 +31,8 @@ const inboxCallbacks = {
   onPin: (c: ActivityCard, p: boolean) => store.cardPin(c, p),
   onDismiss: (c: ActivityCard) => store.cardDismiss(c),
   onLocate: (c: ActivityCard) => store.locateMessage(c.anchorMessageId),
-  onArchive: (c: ActivityCard) => store.cardToProject(c),
 }
+const inboxCallbacks = { ...scratchInboxCallbacks, onArchive: (c: ActivityCard) => store.cardToProject(c) }
 
 /** 项目收件箱视图（CF3/D49/D51）：项目级卡片 ∪ 其他会话待办（done 不聚合）。 */
 function ProjectInbox({ cards, filter }: { cards: ActivityCard[]; filter: InboxFilter }) {
@@ -63,7 +64,9 @@ export function Workbench() {
   const cards = useStore(s => s.cards)
   const plan = useStore(s => s.plan)
   const todos = useStore(s => s.todos)
-  const inboxScope = useStore(s => s.inboxScope)
+  const scratch = useStore(s => !!s.tasks.find(t => t.id === s.currentConvId)?.scratch)
+  const storedScope = useStore(s => s.inboxScope)
+  const inboxScope = scratch ? 'conv' : storedScope
   const projectCards = useStore(s => s.projectCards)
   const filter = useStore(s => s.ui.inboxFilter)
   const visible = inboxScope === 'project' ? projectCards : cards
@@ -87,7 +90,7 @@ export function Workbench() {
       </div>
       {rightTab === 'files'
         ? <FilesTab />
-        : <WorkTab plan={plan} todos={todos} filter={filter} inboxScope={inboxScope} projectCards={projectCards} cards={cards} />}
+        : <WorkTab plan={plan} todos={todos} filter={filter} inboxScope={inboxScope} projectCards={projectCards} cards={cards} scratch={scratch} />}
     </>
   )
 }
@@ -105,13 +108,14 @@ export function hasActiveProgressCard(cards: ActivityCard[]): boolean {
   return cards.some(c => c.kind === 'progress' && (c.status === 'active' || c.status === 'action_required'))
 }
 
-function WorkTab({ plan, todos, filter, inboxScope, projectCards, cards }: {
+function WorkTab({ plan, todos, filter, inboxScope, projectCards, cards, scratch }: {
   plan: Parameters<typeof CurrentTaskCard>[0]['plan']
   todos: Parameters<typeof CurrentTaskCard>[0]['todos']
   filter: InboxFilter
   inboxScope: 'conv' | 'project'
   projectCards: ActivityCard[]
   cards: ActivityCard[]
+  scratch: boolean
 }) {
   const record = useStore(s => s.workRecord)
   const showCurrentTask = !hasActiveProgressCard(cards)
@@ -122,16 +126,16 @@ function WorkTab({ plan, todos, filter, inboxScope, projectCards, cards }: {
         {showCurrentTask ? <CurrentTaskCard plan={plan} todos={todos} /> : null}
         <div className="inbox-scope" role="tablist" aria-label="收件箱范围与筛选">
           <button className={inboxScope === 'conv' ? 'active' : ''} onClick={() => store.setInboxScope('conv')}>本会话</button>
-          <button className={inboxScope === 'project' ? 'active' : ''} onClick={() => store.setInboxScope('project')}>
+          {!scratch && <button className={inboxScope === 'project' ? 'active' : ''} onClick={() => store.setInboxScope('project')}>
             项目{pendingCount(projectCards) > 0 ? ` ${pendingCount(projectCards)}` : ''}
-          </button>
+          </button>}
           <span style={{ flex: 1 }} />
           <button className={filter === 'todo' ? 'active' : ''} title="只看待处理" onClick={() => store.setUI({ inboxFilter: 'todo' })}>待处理</button>
           <button className={filter === 'all' ? 'active' : ''} title="全部卡片" onClick={() => store.setUI({ inboxFilter: 'all' })}>全部</button>
         </div>
         {inboxScope === 'project'
           ? <ProjectInbox cards={projectCards} filter={filter} />
-          : <InboxList cards={cards} docBridge={docBridge} callbacks={inboxCallbacks} filter={filter} />}
+          : <InboxList cards={cards} docBridge={docBridge} callbacks={scratch ? scratchInboxCallbacks : inboxCallbacks} filter={filter} />}
         <WorkspaceSurfaces />
         </>}
       </div>

src/contracts.ts

@@ -18,6 +18,8 @@ export interface Conversation {
   allowCrossRead?: boolean; crossPrivate?: boolean;
   permissionMode?: 'default' | 'plan' | 'auto_edit' | '';
   sessionNote?: string;
+  /** 无项目对话：服务端内部项目只承载这一条会话，不出现在项目列表里。 */
+  scratch?: boolean;
   createdAt: string; updatedAt: string;
 }
 

src/store.test.ts

@@ -306,14 +306,27 @@ describe('RefreshReconnectCompensate', () => {
   })
 })
 
+function routeScratchSession() {
+  const previous = route
+  route = (path, init) => {
+    if (path === '/api/scratch-sessions' && init?.method === 'POST') {
+      return Promise.resolve(response({ project: project('scratch-1'), conversation: { ...task('scratch-conv', 'scratch-1'), scratch: true } }))
+    }
+    if (path === '/api/conversations/scratch-conv') return Promise.resolve(response({ conversation: { ...task('scratch-conv', 'scratch-1'), scratch: true }, messages: [], runs: [], activeHitl: [], lastSeq: 0 }))
+    return previous(path, init)
+  }
+}
+
 describe('DefaultProjectDisabled', () => {
   it('does not create a default project when the member has no projects yet', async () => {
     projects = []
     await store.refreshProjects()
+    routeScratchSession()
     requests = []
-    await expect(store.createTask()).rejects.toThrow(/等待项目负责人邀请/)
-    expect(requests.filter(r => r.init?.method === 'POST')).toEqual([])
-    expect(store.getState().toast).toMatch(/等待项目负责人邀请/)
+    await store.createTask()
+    const posts = requests.filter(r => r.init?.method === 'POST').map(r => r.path)
+    expect(posts).toEqual(['/api/scratch-sessions'])
+    expect(store.getState()).toMatchObject({ scratchMode: true, currentConvId: 'scratch-conv', currentProjectId: 'scratch-1' })
   })
 
   it('does not treat a list that has not arrived as empty', async () => {
@@ -335,9 +348,12 @@ describe('DefaultProjectDisabled', () => {
     await store.refreshMe()
     projects = []
     await store.refreshProjects()
+    routeScratchSession()
     requests = []
-    await expect(store.createTask()).rejects.toThrow(/请先新建项目/)
+    await store.createTask()
     expect(requests.filter(r => r.path === '/api/projects' && r.init?.method === 'POST')).toEqual([])
+    expect(requests.filter(r => r.init?.method === 'POST').map(r => r.path)).toEqual(['/api/scratch-sessions'])
+    expect(store.getState().projects).toEqual([])
   })
 
   it('surfaces the stage-specific project error before any POST is sent', async () => {

src/store.ts

@@ -3,7 +3,7 @@
 import { useSyncExternalStore } from 'react'
 import { type AdminZoneSection, type LinkedCapabilities, api, connectEvents } from './api'
 import { auth } from './auth'
-import { canCreateProject, noProjectError, projectActionError, projectWorkError } from './projectmeta'
+import { noProjectError, projectActionError, projectWorkError } from './projectmeta'
 import { applyTextDelta, applyThinkingDelta, applyToolCall, applyToolCallDelta, applyToolResult, applyToolOutput, applyArtifactCreated, applyArtifactUpdated, applyCheck, applyFinalizing, type LiveItem } from './live'
 import { closePreviewTab, mergeOrphanPreviewTabs, openPreviewTab, previewTabsKey, type PreviewTab } from './previewtabs'
 import { deliveryRequestId, enqueueMessage, enqueueMessageFront, newQueuedMessage, promoteQueuedMessage, removeQueuedMessage, replaceQueuedText, type QueuedMessage, type WorkReference } from './outbox'
@@ -85,6 +85,8 @@ export interface UIState {
   taskOrg: 'project' | 'timeline'
   showArchived: boolean
   lastProjectId: string | null
+  /** 用户上次停留在无项目对话视图；刷新后回到同一视图。 */
+  lastScratch: boolean
   /** 系统管理全屏视图（阶段② IA：仅管理员；入口账户菜单，纵深防御在 AdminZone 再拦一次）。 */
   adminZoneOpen: boolean
   changePwOpen: boolean
@@ -93,6 +95,11 @@ export interface UIState {
 
 export interface Me { owner: string; name: string; auth: boolean; isAdmin?: boolean; isSuperAdmin?: boolean; mustChangePassword?: boolean; systemActions?: string[]; linkedCapabilities?: LinkedCapabilities }
 
+/** 能否新建真实项目（无项目对话不需要此能力）；服务端仍按当前身份最终判定。 */
+export function canCreateProject(me: Pick<Me, 'auth' | 'systemActions'> | null | undefined): boolean {
+  return !!me && (!me.auth || !!me.systemActions?.includes('project.create'))
+}
+
 /** KTD9 项目自动发现：可见页每 2 秒串行重查；单次请求预算 2 秒、渲染预留 1 秒，正常链路 5 秒内可见。 */
 export const PROJECT_SYNC_INTERVAL_MS = 2000
 export const PROJECT_SYNC_REQUEST_BUDGET_MS = 2000
@@ -107,6 +114,8 @@ interface AppState {
   projectsLoaded: boolean
   projectSync: { status: ProjectSyncStatus; failures: number }
   currentProjectId: string | null
+  /** 无项目对话视图：currentProjectId 此时是无项目对话的内部项目，不在 projects 里。 */
+  scratchMode: boolean
   tasks: Conversation[]
   me: Me | null
   currentConvId: string | null
@@ -181,6 +190,7 @@ filesView: 'list', workspaceSurfacePin: null,
   taskOrg: 'project',
   showArchived: false,
   lastProjectId: null,
+  lastScratch: false,
   adminZoneOpen: false,
   changePwOpen: false,
   projectSettingsId: null,
@@ -210,7 +220,7 @@ const surfaceActionsInflight: Record<string, boolean> = {}
 let state: AppState = {
   contextObs: {},
   projects: [], projectsLoaded: false, projectSync: { status: 'idle', failures: 0 },
-  currentProjectId: null, tasks: [], me: null, currentConvId: null,
+  currentProjectId: null, scratchMode: false, tasks: [], me: null, currentConvId: null,
   messages: [], runs: [], activeHitl: [], lastSeq: 0, live: null,
   plan: null, todos: null, artifacts: [], surfaces: [], projectSurfaces: [], cards: [], projectCards: [], cardActionStates: {}, workRecord: null, workReference: null, inboxScope: 'conv', runtimeMock: false, profiles: [], pluginPanels: [],
   serverWorkspaces: [],
@@ -348,6 +358,29 @@ function resetProjectScope() {
   setUI({ previewExpanded: false, filesView: 'list' })
 }
 
+/** remember=false 用于没有真实项目时的自动进入：不改写用户上次选择的视图。 */
+function setScratchMode(on: boolean, remember = true) {
+  if (state.scratchMode !== on) set({ scratchMode: on })
+  if (remember && state.ui.lastScratch !== on) setUI({ lastScratch: on })
+}
+
+/** 绑定会话所属项目（真实项目或无项目对话的内部项目），供上传与工件归属。 */
+async function bindProject(projectId: string, remember: boolean) {
+  if (state.currentProjectId !== projectId) resetProjectScope()
+  set({ currentProjectId: projectId })
+  if (state.inboxScope === 'project') {
+    store.loadProjectCards()
+    store.connectProject()
+  }
+  if (remember) setUI({ lastProjectId: projectId })
+  await store.refreshArtifacts(projectId)
+}
+
+function latestScratchTask(): Conversation | undefined {
+  return state.tasks.filter(t => t.scratch && !t.archived)
+    .reduce<Conversation | undefined>((latest, t) => !latest || t.updatedAt > latest.updatedAt ? t : latest, undefined)
+}
+
 function observeDetail(observations: Record<string, DetailObservation>, id: string, seq = state.lastSeq, terminal = false) {
   const version = ++detailVersion
   observations[id] = { ...observations[id], version, seq,
@@ -582,18 +615,22 @@ async function mergeProjectList(projects: Project[]) {
   const membershipChanged = !state.projectsLoaded || projectIdsKey(state.projects) !== projectIdsKey(projects)
   set({ projects, projectsLoaded: true, error: null })
   const current = state.currentProjectId
-  if (current && !projects.some(p => p.id === current)) {
+  // 无项目对话视图绑定的是不在列表里的内部项目，列表变化不切换视图。
+  if (state.scratchMode) { /* keep the scratch view */ }
+  else if (current && !projects.some(p => p.id === current)) {
     const fallback = projects[0]
     if (fallback) await store.openProject(fallback.id)
     else {
       resetProjectScope()
       set({ currentProjectId: null })
       setUI({ lastProjectId: null })
+      setScratchMode(true, false)
     }
     store.toast('你已不在原项目中，已清除该项目的入口')
   } else if (!current) {
     const next = projects.find(p => p.id === state.ui.lastProjectId) ?? projects[0]
     if (next) await store.openProject(next.id)
+    else setScratchMode(true, false)
   }
   if (membershipChanged) await store.refreshTasks()
 }
@@ -617,7 +654,7 @@ export const store = {
     for (const key of Object.keys(surfaceActionsInflight)) delete surfaceActionsInflight[key]
     convRestoreDone = true
     persistConvId(null)
-    set({ projects: [], projectsLoaded: false, currentProjectId: null, tasks: [], me: null, currentConvId: null,
+    set({ projects: [], projectsLoaded: false, currentProjectId: null, scratchMode: false, tasks: [], me: null, currentConvId: null,
       contextObs: {}, messages: [], runs: [], activeHitl: [], lastSeq: 0, live: null,
       plan: null, todos: null, artifacts: [], surfaces: [], projectSurfaces: [],
       cards: [], projectCards: [], cardActionStates: {}, workRecord: null, workReference: null, inboxScope: 'conv',
@@ -626,7 +663,7 @@ export const store = {
       rdmDocReviewAvailable: false, rdmPermMatrixAvailable: false, rdmRender: NO_RENDER_CAPABILITIES,
       connected: false, posting: false, error: null, toast: null, outbox: [], outboxDraining: false,
       previewTabs: {}, previewActive: {}, previewOpenIntent: 0 })
-    setUI({ lastProjectId: null, projectSettingsId: null, adminZoneOpen: false, activeWorkspace: null,
+    setUI({ lastProjectId: null, lastScratch: false, projectSettingsId: null, adminZoneOpen: false, activeWorkspace: null,
       settingsOpen: false, changePwOpen: false, trackerRunId: null, workspaceSurfacePin: null,
       previewExpanded: false, filesView: 'list', showArchived: false })
   },
@@ -634,16 +671,23 @@ export const store = {
   async refreshProjects() {
     const epoch = identityEpoch
     const request = ++projectsRequest
+    let scratch = false
     try {
       const projects = await api.listProjects()
       if (epoch !== identityEpoch || request !== projectsRequest) return
-      const current = projects.find(p => p.id === state.currentProjectId) ?? projects.find(p => p.id === state.ui.lastProjectId) ?? projects[0]
-      set({ projects, projectsLoaded: true, currentProjectId: current?.id ?? null, error: null })
-      if (current) await store.openProject(current.id)
+      // 没有真实项目（或上次停留在无项目对话）时进入无项目对话视图，而不是停在空项目上。
+      scratch = projects.length === 0 || state.ui.lastScratch
+      if (scratch) set({ projects, projectsLoaded: true, error: null })
+      else {
+        const current = projects.find(p => p.id === state.currentProjectId) ?? projects.find(p => p.id === state.ui.lastProjectId) ?? projects[0]
+        set({ projects, projectsLoaded: true, currentProjectId: current?.id ?? null, error: null })
+        if (current) await store.openProject(current.id)
+      }
     } catch (e) {
       if (epoch === identityEpoch && request === projectsRequest) set({ error: projectActionError(e) })
     }
     if (epoch === identityEpoch && request === projectsRequest) await store.refreshTasks()
+    if (scratch && epoch === identityEpoch && request === projectsRequest) await store.enterScratchMode(state.ui.lastScratch)
   },
 
   /** 自动发现的一次重查：与 refreshProjects 共用请求代次，迟到/旧身份响应丢弃；失败抛出供退避。 */
@@ -674,14 +718,16 @@ export const store = {
     const request = ++tasksRequest
     try {
       const tasks = await api.listTasks(includeArchived)
-      if (epoch !== identityEpoch || request !== tasksRequest) return
+      if (epoch !== identityEpoch || request !== tasksRequest || !Array.isArray(tasks)) return
       set({ tasks })
       // 首次加载恢复上次会话（仅一次；此后用户主动切换/新建不再打扰）。
       if (!convRestoreDone) {
         convRestoreDone = true
         const saved = savedConvId()
-        if (saved && !state.currentConvId && tasks.some(t => t.id === saved && !t.archived)) {
-          store.openConversation(saved)
+        const restored = saved ? tasks.find(t => t.id === saved && !t.archived) : undefined
+        if (restored && !state.currentConvId) {
+          if (restored.scratch) await store.openTask(restored.id)
+          else store.openConversation(restored.id)
         }
       }
     } catch { /* 列表竞态，静默 */ }
@@ -719,22 +765,41 @@ export const store = {
     }
   },
 
+  /** 打开真实项目：同时离开无项目对话视图。 */
   async openProject(projectId: string) {
-    if (state.currentProjectId !== projectId) resetProjectScope()
-    set({ currentProjectId: projectId })
-    if (store.getState().inboxScope === 'project') {
-      store.loadProjectCards()
-      store.connectProject()
-    }
-    store.setUI({ lastProjectId: projectId })
-    await store.refreshArtifacts(projectId)
+    setScratchMode(false)
+    await bindProject(projectId, true)
+  },
+
+  /** 进入无项目对话视图：当前会话不是无项目对话时清空会话视图，并打开最近一条未归档的无项目对话。 */
+  async enterScratchMode(remember = true) {
+    const epoch = identityEpoch
+    const current = state.tasks.find(t => t.id === state.currentConvId)
+    setScratchMode(true, remember)
+    if (current?.scratch) return
+    if (state.currentProjectId || state.currentConvId) resetProjectScope()
+    set({ currentProjectId: null })
+    const latest = latestScratchTask()
+    if (latest && epoch === identityEpoch) await store.openTask(latest.id)
   },
 
   /** 新建任务（=会话）：默认当前项目上下文；显式 projectId 用于"新建于指定项目"。
-   * 没有项目时不代建「默认项目」：列表未到达或无创建能力时自动建项目会误触权限与同名冲突。 */
+   * 无项目对话视图、或项目列表已到达且没有真实项目时，新建无项目对话；从不代建真实项目。 */
   async createTask(projectId?: string) {
     const epoch = identityEpoch
+    const changed = () => { if (epoch !== identityEpoch) throw new Error('登录状态已变化，请重新选择项目后再试') }
     try {
+      if (state.scratchMode || (!projectId && !state.currentProjectId && state.projectsLoaded && state.projects.length === 0)) {
+        const { conversation } = await api.createScratchSession()
+        changed()
+        setScratchMode(true)
+        await store.refreshTasks()
+        changed()
+        if (!state.tasks.some(t => t.id === conversation.id)) set({ tasks: [{ ...conversation, scratch: true }, ...state.tasks] })
+        await store.openTask(conversation.id)
+        changed()
+        return
+      }
       let pid = projectId ?? state.currentProjectId
       if (!pid && state.projects.length > 0) pid = state.projects[0].id
       if (!pid) throw new Error(noProjectError(state.projectsLoaded, canCreateProject(state.me)))
@@ -761,12 +826,15 @@ export const store = {
     if (title) store.toast('已在当前项目创建任务')
   },
 
-  /** 打开任务：跨项目点击时切换项目上下文（工件/上传归属正确）。 */
+  /** 打开任务：跨项目点击时切换项目上下文（工件/上传归属正确）；视图随任务进入或离开无项目对话。 */
   async openTask(convId: string) {
     const epoch = identityEpoch
     const t = state.tasks.find(x => x.id === convId)
-    if (t && t.projectId !== state.currentProjectId) await store.openProject(t.projectId)
+    if (t?.scratch) {
+      if (t.projectId !== state.currentProjectId) await bindProject(t.projectId, false)
+    } else if (t && t.projectId !== state.currentProjectId) await store.openProject(t.projectId)
     if (epoch !== identityEpoch) return
+    if (t) setScratchMode(!!t.scratch)
     await store.openConversation(convId)
   },
 

test/scratch-session.test.ts

@@ -0,0 +1,129 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { auth } from '../src/auth'
+import { canCreateProject, store } from '../src/store'
+import type { Conversation, Project } from '../src/contracts'
+
+const project = (id: string): Project => ({ id, name: id, createdAt: '', updatedAt: '' })
+const task = (id: string, projectId: string, scratch = false, updatedAt = ''): Conversation =>
+  ({ id, projectId, title: id, createdAt: '', updatedAt, ...(scratch ? { scratch: true } : {}) })
+const response = (value: unknown, status = 200) => new Response(JSON.stringify(value), { status })
+const detail = (conversation: Conversation) => response({ conversation, messages: [], runs: [], activeHitl: [], lastSeq: 0 })
+
+let projects: Project[]
+let tasks: Conversation[]
+let me: Record<string, unknown>
+let requests: { path: string; init?: RequestInit }[]
+let scratchCount: number
+
+const posts = () => requests.filter(r => r.init?.method === 'POST').map(r => r.path)
+
+beforeEach(async () => {
+  projects = []; tasks = []; requests = []; scratchCount = 0
+  me = { owner: 'bob', name: 'Bob', auth: true, systemActions: [] }
+  const saved = new Map<string, string>()
+  vi.stubGlobal('localStorage', { getItem: (key: string) => saved.get(key) ?? null,
+    setItem: (key: string, value: string) => { saved.set(key, value) },
+    removeItem: (key: string) => { saved.delete(key) } })
+  vi.stubGlobal('fetch', async (path: string, init?: RequestInit) => {
+    requests.push({ path, init })
+    if (path === '/api/projects' && !init?.method) return response(projects)
+    if (path === '/api/conversations' && !init?.method) return response(tasks)
+    if (path === '/api/me') return response(me)
+    if (path === '/api/scratch-sessions' && init?.method === 'POST') {
+      const id = `scratch-${++scratchCount}`
+      const conversation = task(`${id}-conv`, id, true)
+      tasks = [conversation, ...tasks]
+      return response({ project: project(id), conversation })
+    }
+    const created = path.match(/^\/api\/projects\/([^/]+)\/conversations$/)
+    if (created && init?.method === 'POST') {
+      const conversation = task(`${created[1]}-new`, created[1])
+      tasks = [conversation, ...tasks]
+      return response(conversation)
+    }
+    const conv = path.match(/^\/api\/conversations\/([^/]+)$/)
+    if (conv && !init?.method) {
+      const found = tasks.find(t => t.id === conv[1])
+      return found ? detail(found) : response({ error: 'not found' }, 404)
+    }
+    if (path.endsWith('/plan') || path.endsWith('/todos')) return response(null)
+    if (path.endsWith('/artifacts') || path.endsWith('/surfaces')) return response([])
+    if (path.endsWith('/cards')) return response({ cards: [] })
+    return response({})
+  })
+  vi.stubGlobal('EventSource', class { addEventListener() {} close() {} })
+  auth.beginSession()
+  await store.refreshMe()
+})
+afterEach(() => { vi.restoreAllMocks(); vi.unstubAllGlobals() })
+
+describe('scratch session entry', () => {
+  it('enters scratch mode for an account without project creation and no projects, and never creates a project', async () => {
+    await store.refreshProjects()
+    expect(store.getState()).toMatchObject({ scratchMode: true, projectsLoaded: true, currentProjectId: null })
+    requests = []
+    await store.createTask()
+    expect(posts()).toEqual(['/api/scratch-sessions'])
+    expect(requests.some(r => r.path === '/api/projects' && r.init?.method === 'POST')).toBe(false)
+    expect(store.getState()).toMatchObject({ scratchMode: true, currentConvId: 'scratch-1-conv', currentProjectId: 'scratch-1', projects: [] })
+  })
+
+  it('always creates a scratch session in scratch mode even when real projects exist', async () => {
+    projects = [project('host-a')]
+    await store.refreshProjects()
+    expect(store.getState()).toMatchObject({ scratchMode: false, currentProjectId: 'host-a' })
+    await store.enterScratchMode()
+    expect(store.getState()).toMatchObject({ scratchMode: true, currentProjectId: null, currentConvId: null })
+    requests = []
+    await store.createTask()
+    await store.createTask()
+    expect(posts()).toEqual(['/api/scratch-sessions', '/api/scratch-sessions'])
+    expect(store.getState()).toMatchObject({ scratchMode: true, currentConvId: 'scratch-2-conv', currentProjectId: 'scratch-2' })
+  })
+
+  it('keeps creating project conversations in project mode', async () => {
+    projects = [project('host-a')]
+    await store.refreshProjects()
+    requests = []
+    await store.createTask()
+    expect(posts()).toEqual(['/api/projects/host-a/conversations'])
+    expect(store.getState()).toMatchObject({ scratchMode: false, currentConvId: 'host-a-new', currentProjectId: 'host-a' })
+  })
+
+  it('returns to the remembered scratch view on reload and opens the latest scratch task', async () => {
+    projects = [project('host-a')]
+    tasks = [task('old', 'scratch-o', true, '2026-01-01'), task('new', 'scratch-n', true, '2026-02-01'), task('work', 'host-a')]
+    await store.refreshProjects()
+    await store.enterScratchMode()
+    expect(store.getState()).toMatchObject({ scratchMode: true, currentConvId: 'new', currentProjectId: 'scratch-n' })
+    expect(store.getState().ui.lastScratch).toBe(true)
+    await store.refreshProjects()
+    expect(store.getState()).toMatchObject({ scratchMode: true, currentConvId: 'new', currentProjectId: 'scratch-n' })
+    await store.openProject('host-a')
+    expect(store.getState()).toMatchObject({ scratchMode: false, currentProjectId: 'host-a' })
+    expect(store.getState().ui.lastScratch).toBe(false)
+  })
+})
+
+describe('scratch mode follows the opened task', () => {
+  it('sets scratch mode for a scratch task and clears it for a normal task', async () => {
+    projects = [project('host-a')]
+    tasks = [task('scratch-conv', 'scratch-1', true), task('work', 'host-a')]
+    await store.refreshProjects()
+    await store.openTask('scratch-conv')
+    expect(store.getState()).toMatchObject({ scratchMode: true, currentConvId: 'scratch-conv', currentProjectId: 'scratch-1' })
+    expect(store.getState().ui.lastProjectId).toBe('host-a')
+    await store.openTask('work')
+    expect(store.getState()).toMatchObject({ scratchMode: false, currentConvId: 'work', currentProjectId: 'host-a' })
+  })
+})
+
+describe('canCreateProject', () => {
+  it('allows project creation without auth or with project.create only', () => {
+    expect(canCreateProject({ auth: false })).toBe(true)
+    expect(canCreateProject({ auth: true, systemActions: ['project.create'] })).toBe(true)
+    expect(canCreateProject({ auth: true, systemActions: [] })).toBe(false)
+    expect(canCreateProject({ auth: true })).toBe(false)
+    expect(canCreateProject(null)).toBe(false)
+  })
+})

test/scratch-surfaces.test.ts

@@ -0,0 +1,92 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { createElement } from 'react'
+import { renderToStaticMarkup } from 'react-dom/server'
+import { setPersistedOpen } from '@ui'
+import type { ActivityCard } from '../src/contracts'
+import { Conversation } from '../src/components/Conversation'
+import { ConversationWork } from '../src/components/ConversationWork'
+import { Workbench } from '../src/components/Workbench'
+import { store } from '../src/store'
+
+// SSR has no browser subscription snapshot: substitute only the hook boundary.
+const snapshot = vi.hoisted(() => ({ state: undefined as ReturnType<typeof store.getState> | undefined }))
+vi.mock('../src/store', async importOriginal => {
+  const actual = await importOriginal<typeof import('../src/store')>()
+  return { ...actual, useStore: (select: (s: ReturnType<typeof store.getState>) => unknown) => select(snapshot.state!) }
+})
+
+// Record the callbacks each card surface receives; the rendered archive button belongs to the UI repo.
+const passed = vi.hoisted(() => ({ inbox: [] as Record<string, unknown>[], card: [] as Record<string, unknown>[] }))
+vi.mock('@ui', async importOriginal => {
+  const actual = await importOriginal<typeof import('@ui')>()
+  return {
+    ...actual,
+    InboxList: (props: { callbacks: Record<string, unknown> }) => { passed.inbox.push(props.callbacks); return null },
+    ActivityCardView: (props: { callbacks: Record<string, unknown> }) => { passed.card.push(props.callbacks); return null },
+  }
+})
+
+const timestamp = '2026-10-12T10:00:00Z'
+const card: ActivityCard = {
+  id: 'card_1', projectId: 'prj_1', conversationId: 'cnv_1', kind: 'progress', title: '整理材料',
+  status: 'active', tone: 'info', body: [], createdAt: timestamp, updatedAt: timestamp,
+}
+
+function setup(scratch: boolean) {
+  const base = store.getState()
+  snapshot.state = {
+    ...base, currentProjectId: 'prj_1', currentConvId: 'cnv_1', connected: true, inboxScope: 'project',
+    tasks: [{ id: 'cnv_1', projectId: 'prj_1', title: '讨论', createdAt: timestamp, updatedAt: timestamp, ...(scratch ? { scratch: true } : {}) }],
+    messages: [], cards: [card], projectCards: [], runs: [], activeHitl: [], live: null, artifacts: [], outbox: [], posting: false,
+    ui: { ...base.ui, rightCollapsed: true, rightTab: 'work', inboxFilter: 'all' },
+    cardActionStates: {}, workRecord: null, surfaces: [],
+  }
+}
+
+beforeEach(() => {
+  passed.inbox = []; passed.card = []
+  setPersistedOpen('conversation-settings:prj_1:cnv_1', true)
+})
+
+describe.each([
+  { name: 'scratch conversation', scratch: true },
+  { name: 'project conversation', scratch: false },
+])('project-only surfaces in a $name', ({ scratch }) => {
+  beforeEach(() => setup(scratch))
+
+  it(scratch ? 'hides the cross-conversation read setting' : 'keeps the cross-conversation read setting', () => {
+    const html = renderToStaticMarkup(createElement(Conversation))
+    expect(html).toContain('会话设置')
+    expect(html).toContain('这次工作的要求')
+    expect(html.includes('读取同项目的其他对话')).toBe(!scratch)
+    expect(html.includes('实际读取范围还需项目设置允许')).toBe(!scratch)
+  })
+
+  it(scratch ? 'keeps the conversation inbox without the project scope' : 'keeps the project scope and inbox', () => {
+    const html = renderToStaticMarkup(createElement(Workbench))
+    expect(html).toContain('本会话')
+    expect(html.includes('>项目')).toBe(!scratch)
+    expect(html.includes('项目收件箱为空')).toBe(!scratch)
+    if (scratch) {
+      expect(passed.inbox).toHaveLength(1)
+      expect(passed.inbox[0]).not.toHaveProperty('onArchive')
+      expect(passed.inbox[0]).toHaveProperty('onDismiss')
+    }
+  })
+
+  it(scratch ? 'omits archive-to-project from conversation inbox cards' : 'offers archive-to-project on conversation inbox cards', () => {
+    snapshot.state!.inboxScope = 'conv'
+    renderToStaticMarkup(createElement(Workbench))
+    expect(passed.inbox).toHaveLength(1)
+    expect(typeof passed.inbox[0].onArchive).toBe(scratch ? 'undefined' : 'function')
+  })
+
+  it(scratch ? 'omits archive-to-project from conversation work cards' : 'offers archive-to-project on conversation work cards', () => {
+    renderToStaticMarkup(createElement(ConversationWork))
+    expect(passed.card.length).toBeGreaterThan(0)
+    for (const callbacks of passed.card) {
+      expect(typeof callbacks.onArchive).toBe(scratch ? 'undefined' : 'function')
+      expect(callbacks).toHaveProperty('onDismiss')
+    }
+  })
+})