diff --git a/src/components/Conversation.tsx b/src/components/Conversation.tsx
index cd7a34f..a1af7ad 100644
--- a/src/components/Conversation.tsx
+++ b/src/components/Conversation.tsx
@@ -4,7 +4,7 @@ import { useEffect, useMemo, useRef, useState } from 'react'
 import { marked } from 'marked'
 import { api } from '../api'
 import { store, useStore, activeRun, type LiveState, type ContextObs } from '../store'
-import { liveToMessage } from '../live'
+import { liveToMessage, showProcessInline } from '../live'
 import type { Message, Part, HITLCard } from '../contracts'
 import { UIRenderer, InlineConfirmCard, hasOpenConfirm } from '@ui'
 import { docBridge } from './Workbench'
@@ -87,11 +87,14 @@ function ProcessCollapse({ parts }: { parts: Part[] }) {
 const LONG_REPLY_CHARS = 800
 
 function LongReplyCollapse({ text }: { text: string }) {
+  // 摘句取压缩空白后的前 100 字；字数按 Markdown 源码长度计。
+  const excerpt = text.replace(/\s+/g, ' ').trim().slice(0, 100)
   return (
     <details className="process-collapse long-reply">
       <summary>
         <span>📄 长回复</span>
-        <span>{text.length} 字（点击展开）</span>
+        <span>{text.length} 字（按 Markdown 源码计）</span>
+        {excerpt && <span style={{ color: 'var(--text-faint)' }}>{excerpt}…</span>}
       </summary>
       <div className="body">
         <div className="part-text" dangerouslySetInnerHTML={{ __html: marked.parse(text) }} />
@@ -113,7 +116,7 @@ function AssistantMessage({ msg, live }: { msg: Message; live?: LiveState | null
   // 流式期间：工具/思考阶段过程实时展开；一旦进入 responding（最终回复开始流式）
   // 立即折叠过程，只显式显示回复（Cursor 式）；工具恢复（acting）时重新展开。
   // run 终态后：按偏好折叠为摘要行（可回看）。
-  const showProcessInline = live ? live.phase !== 'responding' : !autoCollapse
+  const showProcess = showProcessInline(live ?? null, autoCollapse)
   const lastContentIdx = split.content.length - 1
   return (
     <div className="msg assistant">
@@ -122,7 +125,7 @@ function AssistantMessage({ msg, live }: { msg: Message; live?: LiveState | null
         <span>助手</span>
         {live && <span className="live-bar"><span className="live-dot" />{live.phase}</span>}
       </div>
-      {split.process.length > 0 && (showProcessInline
+      {split.process.length > 0 && (showProcess
         ? split.process.map((p, i) => <div className="part" key={i}><PartView part={p} live={!!live} /></div>)
         : <ProcessCollapse parts={split.process} />)}
       {split.content.map((p, i) => {
@@ -250,7 +253,7 @@ export function Conversation() {
 
   useEffect(() => {
     bodyRef.current?.scrollTo({ top: bodyRef.current.scrollHeight })
-  }, [messages.length, live?.texts, live?.thinking, live?.toolCalls.length, live?.phase, activeHitl.length])
+  }, [messages.length, live?.items, live?.phase, activeHitl.length])
 
   const send = async () => {
     if (!text.trim() && attachmentIds.length === 0) return
diff --git a/src/live.ts b/src/live.ts
index dac750b..2992b1a 100644
--- a/src/live.ts
+++ b/src/live.ts
@@ -1,36 +1,91 @@
-// live 流式投影纯逻辑（中栏过程/回复分离）：按 delta index 分桶、合成临时消息。
-// 新文本桶只在新轮开启（必经工具轮），故除最后一桶外均为工具轮过程解说（process）；
-// 最后一桶是正在流式的回复——与落库消息的 process 语义同构，终态对账无跳变。
+// live 流式投影纯逻辑（中栏过程/回复分离）：事件按到达序并入 items——thinking/text
+// 增量各并入其末段，工具按当前位置落位。SSE 有序且后端每轮按 思考→正文→工具 追加落库
+// 部件，事件到达序即落库序，故合成消息与落库部件同构，终态对账不重排。
+// 文本段是否为过程（process）由「本段之后、下一个思考/文本段之前是否出现工具」判定，
+// 对齐落库的 Process: len(calls) > 0——工具轮解说的 tool.call 一到即并入过程区，
+// 无需等下一轮文本段开启。
+// 残余边界：某轮若既无正文也无思考、仅静默发起工具，其调用会被并入上一文本段（需协议
+// 携带轮次归属才能消除；现行事件流无法区分）。
 import type { Message, Part } from './contracts'
 import type { LiveState } from './store'
 
-export interface TextBucket { index: number; text: string }
+// 到达序部件流的元素。
+export type LiveItem =
+  | { kind: 'thinking'; text: string }
+  | { kind: 'text'; index: number; text: string }
+  | { kind: 'tool'; name: string; status?: string; summary?: string }
 
-// applyTextDelta 把一段正文增量并入桶序列：index 与末桶相同则追加，否则开新桶。
-export function applyTextDelta(buckets: TextBucket[], index: number, delta: string): TextBucket[] {
-  const last = buckets[buckets.length - 1]
-  if (last && last.index === index) {
-    const out = buckets.slice()
-    out[out.length - 1] = { index, text: last.text + delta }
+// applyThinkingDelta 并入思考增量：末段是思考则追加，否则开启新思考段（新轮开始）。
+export function applyThinkingDelta(items: LiveItem[], delta: string): LiveItem[] {
+  const last = items[items.length - 1]
+  if (last && last.kind === 'thinking') {
+    const out = items.slice()
+    out[out.length - 1] = { kind: 'thinking', text: last.text + delta }
     return out
   }
-  return [...buckets, { index, text: delta }]
+  return [...items, { kind: 'thinking', text: delta }]
+}
+
+// applyTextDelta 并入正文增量：末段是同 index 的文本段则追加，否则开启新文本段。
+export function applyTextDelta(items: LiveItem[], index: number, delta: string): LiveItem[] {
+  const last = items[items.length - 1]
+  if (last && last.kind === 'text' && last.index === index) {
+    const out = items.slice()
+    out[out.length - 1] = { kind: 'text', index, text: last.text + delta }
+    return out
+  }
+  return [...items, { kind: 'text', index, text: delta }]
+}
+
+export function applyToolCall(items: LiveItem[], name: string): LiveItem[] {
+  return [...items, { kind: 'tool', name }]
+}
+
+// applyToolResult 回填最近一个未决工具（与落库的尾部配对语义一致）。
+export function applyToolResult(items: LiveItem[], status: string, summary?: string): LiveItem[] {
+  for (let i = items.length - 1; i >= 0; i--) {
+    const it = items[i]
+    if (it.kind === 'tool' && it.status === undefined) {
+      const out = items.slice()
+      out[i] = { kind: 'tool', name: it.name, status, summary }
+      return out
+    }
+  }
+  return items
 }
 
 // liveToMessage：run 进行中没有已落库的助手消息，把 LiveState 合成同构临时消息，
 // 复用 AssistantMessage 渲染（思考/工具/文本实时上屏）；终态对账后由真消息替代。
 export function liveToMessage(live: LiveState): Message {
-  const parts: Part[] = []
-  if (live.thinking) parts.push({ type: 'thinking', text: live.thinking, process: true })
-  for (let i = 0; i < live.texts.length; i++) {
-    parts.push({ type: 'text', text: live.texts[i].text, process: i < live.texts.length - 1 || undefined })
+  // 文本段是否为过程：本段之后、下一个思考/文本段之前出现工具（= 该轮带工具调用）。
+  const textProcess = new Map<number, boolean>()
+  for (let i = 0; i < live.items.length; i++) {
+    if (live.items[i].kind !== 'text') continue
+    let hasCalls = false
+    for (let j = i + 1; j < live.items.length && live.items[j].kind === 'tool'; j++) hasCalls = true
+    textProcess.set(i, hasCalls)
   }
-  for (const tc of live.toolCalls) {
-    parts.push({ type: 'tool_call', process: true, toolCall: { id: '', name: tc.name } })
-    if (tc.status !== undefined) {
-      parts.push({ type: 'tool_result', process: true, toolCall: { id: '', name: tc.name },
-        toolResult: { callId: '', status: tc.status === 'error' ? 'error' : 'ok', summary: tc.summary } })
+  const parts: Part[] = []
+  for (let i = 0; i < live.items.length; i++) {
+    const it = live.items[i]
+    if (it.kind === 'thinking') {
+      if (it.text) parts.push({ type: 'thinking', text: it.text, process: true })
+    } else if (it.kind === 'tool') {
+      parts.push({ type: 'tool_call', process: true, toolCall: { id: '', name: it.name } })
+      if (it.status !== undefined) {
+        parts.push({ type: 'tool_result', process: true, toolCall: { id: '', name: it.name },
+          toolResult: { callId: '', status: it.status === 'error' ? 'error' : 'ok', summary: it.summary } })
+      }
+    } else {
+      parts.push({ type: 'text', text: it.text, process: textProcess.get(i) || undefined })
     }
   }
   return { id: `live:${live.runId}`, conversationId: '', role: 'assistant', runId: live.runId, parts, createdAt: '' }
 }
+
+// showProcessInline：流式期间过程区是否展开——thinking/acting 实时展开；一旦进入
+// responding（最终回复开始流式）立即折叠，只显示回复（Cursor 式），工具恢复再展开。
+// 非 live 消息随「自动折叠过程」偏好。
+export function showProcessInline(live: LiveState | null, autoCollapse: boolean): boolean {
+  return live ? live.phase !== 'responding' : !autoCollapse
+}
diff --git a/src/store.ts b/src/store.ts
index bf064ff..04047ca 100644
--- a/src/store.ts
+++ b/src/store.ts
@@ -2,7 +2,7 @@
 // useSyncExternalStore 驱动；live 流式部件为会话内临时态，run 终态后由消息树对账收敛。
 import { useSyncExternalStore } from 'react'
 import { api, connectEvents } from './api'
-import { applyTextDelta } from './live'
+import { applyTextDelta, applyThinkingDelta, applyToolCall, applyToolResult, type LiveItem } from './live'
 import type {
   Project, Conversation, Message, Run, Artifact, HITLCard, PlanSnapshot, TodoList,
   AgentProfile, StreamEvent, PluginPanel, ActivityCard,
@@ -17,11 +17,9 @@ export interface ContextObs {
 export interface LiveState {
   runId: string
   phase: string
-  thinking: string
-  // 按 delta index 分桶的文本：新桶只在新轮开启（必经工具轮），故除最后一桶外
-  // 均为工具轮过程解说（process）；最后一桶是正在流式的回复。
-  texts: { index: number; text: string }[]
-  toolCalls: { name: string; status?: string; summary?: string }[]
+  // 到达序部件流（见 live.ts LiveItem）：事件到达序即落库序，与落库部件的轮次穿插序
+  // 同构；文本段是否为过程由「本段内是否出现工具调用」判定，tool.call 一到即改标。
+  items: LiveItem[]
   agentNotes: Record<string, string>
   startedAt: number
 }
@@ -256,26 +254,22 @@ export const store = {
     switch (e.type) {
       case 'message.delta': {
         const p = e.payload as { index: number; text: string }
-        set({ live: touchLive(e.runId ?? '', l => { l.texts = applyTextDelta(l.texts, p.index, p.text) }) })
+        set({ live: touchLive(e.runId ?? '', l => { l.items = applyTextDelta(l.items, p.index, p.text) }) })
         break
       }
       case 'thinking.delta': {
         const p = e.payload as { index: number; text: string }
-        set({ live: touchLive(e.runId ?? '', l => { l.thinking += p.text }) })
+        set({ live: touchLive(e.runId ?? '', l => { l.items = applyThinkingDelta(l.items, p.text) }) })
         break
       }
       case 'tool.call': {
         const p = e.payload as { callId: string; name: string }
-        set({ live: touchLive(e.runId ?? '', l => { l.toolCalls.push({ name: p.name }) }) })
+        set({ live: touchLive(e.runId ?? '', l => { l.items = applyToolCall(l.items, p.name) }) })
         break
       }
       case 'tool.result': {
         const p = e.payload as { callId: string; status: string; summary?: string }
-        set({ live: touchLive(e.runId ?? '', l => {
-          for (let i = l.toolCalls.length - 1; i >= 0; i--) {
-            if (l.toolCalls[i].status === undefined) { l.toolCalls[i] = { ...l.toolCalls[i], status: p.status, summary: p.summary }; break }
-          }
-        }) })
+        set({ live: touchLive(e.runId ?? '', l => { l.items = applyToolResult(l.items, p.status, p.summary) }) })
         break
       }
       case 'run.phase': {
@@ -370,7 +364,7 @@ export const store = {
         // 竞态保护：POST 返回前 SSE 事件可能已先行到达并累积（同 run），
         // 此时保留已累积的 live，只补挂用户消息；否则初始化空 live。
         if (!state.live || state.live.runId !== out.run.id) {
-          set({ live: { runId: out.run.id, phase: 'thinking', thinking: '', texts: [], toolCalls: [], agentNotes: {}, startedAt: Date.now() } })
+          set({ live: { runId: out.run.id, phase: 'thinking', items: [], agentNotes: {}, startedAt: Date.now() } })
         }
         set({ messages: [...state.messages, out.message] })
         store.connectIfNeeded()
@@ -504,8 +498,8 @@ export const store = {
 }
 
 function touchLive(_runId: string, mutate: (l: LiveState) => void): LiveState | null {
-  const base = state.live ?? { runId: _runId, phase: 'thinking', thinking: '', texts: [], toolCalls: [], agentNotes: {}, startedAt: Date.now() }
-  const next: LiveState = { ...base, toolCalls: [...base.toolCalls], agentNotes: { ...base.agentNotes } }
+  const base = state.live ?? { runId: _runId, phase: 'thinking', items: [], agentNotes: {}, startedAt: Date.now() }
+  const next: LiveState = { ...base, agentNotes: { ...base.agentNotes } }
   mutate(next)
   return next
 }
diff --git a/test/live.test.ts b/test/live.test.ts
index afac657..62c9726 100644
--- a/test/live.test.ts
+++ b/test/live.test.ts
@@ -1,48 +1,134 @@
-// live 流式投影纯逻辑测试（中栏过程/回复分离）：分桶、process 标记、终态同构。
+// live 流式投影纯逻辑测试（中栏过程/回复分离）：到达序并段、process 标记时机、
+// 轮次穿插同构、过程区折叠谓词。
 import { describe, it, expect } from 'vitest'
-import { applyTextDelta, liveToMessage, type TextBucket } from '../src/live'
+import {
+  applyTextDelta, applyThinkingDelta, applyToolCall, applyToolResult,
+  liveToMessage, showProcessInline, type LiveItem,
+} from '../src/live'
 import type { LiveState } from '../src/store'
 
 function live(over: Partial<LiveState> = {}): LiveState {
-  return { runId: 'r1', phase: 'thinking', thinking: '', texts: [], toolCalls: [], agentNotes: {}, startedAt: 0, ...over }
+  return { runId: 'r1', phase: 'thinking', items: [], agentNotes: {}, startedAt: 0, ...over }
 }
 
-describe('applyTextDelta', () => {
-  it('appends to the last bucket when index matches', () => {
-    let b: TextBucket[] = []
-    b = applyTextDelta(b, 0, '先查')
-    b = applyTextDelta(b, 0, '一下')
-    expect(b).toEqual([{ index: 0, text: '先查一下' }])
+// 两轮流式事件回放：思考→解说文本→工具→思考→最终回复（与后端事件序一致）。
+function twoTurnItems(): LiveItem[] {
+  let items: LiveItem[] = []
+  items = applyThinkingDelta(items, '先想想')
+  items = applyThinkingDelta(items, '一下')
+  items = applyTextDelta(items, 0, '我先更新待办。')
+  items = applyToolCall(items, 'update_todos')
+  items = applyToolResult(items, 'ok', '已更新')
+  items = applyThinkingDelta(items, '再想想')
+  items = applyTextDelta(items, 1, '最终')
+  items = applyTextDelta(items, 1, '回复')
+  return items
+}
+
+describe('applyThinkingDelta / applyTextDelta', () => {
+  it('merges thinking deltas into the last thinking segment', () => {
+    let items: LiveItem[] = []
+    items = applyThinkingDelta(items, '先')
+    items = applyThinkingDelta(items, '想想')
+    expect(items).toEqual([{ kind: 'thinking', text: '先想想' }])
   })
-  it('opens a new bucket when index advances (new turn)', () => {
-    let b: TextBucket[] = applyTextDelta([], 0, '解说')
-    b = applyTextDelta(b, 1, '最终')
-    b = applyTextDelta(b, 1, '回复')
-    expect(b).toEqual([{ index: 0, text: '解说' }, { index: 1, text: '最终回复' }])
+  it('opens a new thinking segment after text/tool (turn boundary)', () => {
+    let items: LiveItem[] = applyThinkingDelta([], '第一轮思考')
+    items = applyTextDelta(items, 0, '解说')
+    items = applyThinkingDelta(items, '第二轮思考')
+    expect(items).toEqual([
+      { kind: 'thinking', text: '第一轮思考' },
+      { kind: 'text', index: 0, text: '解说' },
+      { kind: 'thinking', text: '第二轮思考' },
+    ])
+  })
+  it('appends text to the last segment when index matches', () => {
+    let items: LiveItem[] = []
+    items = applyTextDelta(items, 0, '先查')
+    items = applyTextDelta(items, 0, '一下')
+    expect(items).toEqual([{ kind: 'text', index: 0, text: '先查一下' }])
+  })
+  it('opens a new text segment when index advances (new turn)', () => {
+    let items: LiveItem[] = applyTextDelta([], 0, '解说')
+    items = applyTextDelta(items, 1, '最终')
+    items = applyTextDelta(items, 1, '回复')
+    expect(items).toEqual([
+      { kind: 'text', index: 0, text: '解说' },
+      { kind: 'text', index: 1, text: '最终回复' },
+    ])
+  })
+  it('fills the most recent pending tool call', () => {
+    let items: LiveItem[] = []
+    items = applyToolCall(items, 'a')
+    items = applyToolCall(items, 'b')
+    items = applyToolResult(items, 'ok', '结果')
+    expect(items).toEqual([
+      { kind: 'tool', name: 'a' },
+      { kind: 'tool', name: 'b', status: 'ok', summary: '结果' },
+    ])
   })
 })
 
 describe('liveToMessage', () => {
-  it('marks all but the last text bucket as process (tool-turn commentary)', () => {
-    const msg = liveToMessage(live({
-      thinking: '思考',
-      texts: [{ index: 0, text: '我先更新待办。' }, { index: 1, text: '完成了。' }],
-      toolCalls: [{ name: 'update_todos', status: 'ok' }],
-    }))
-    const texts = msg.parts.filter(p => p.type === 'text')
-    expect(texts.map(p => p.process)).toEqual([true, undefined])
-    expect(texts.map(p => p.text)).toEqual(['我先更新待办。', '完成了。'])
+  it('interleaves parts per turn in arrival order, matching persisted parts', () => {
+    const msg = liveToMessage(live({ items: twoTurnItems() }))
+    expect(msg.parts).toEqual([
+      { type: 'thinking', text: '先想想一下', process: true },
+      { type: 'text', text: '我先更新待办。', process: true },
+      { type: 'tool_call', process: true, toolCall: { id: '', name: 'update_todos' } },
+      { type: 'tool_result', process: true, toolCall: { id: '', name: 'update_todos' },
+        toolResult: { callId: '', status: 'ok', summary: '已更新' } },
+      { type: 'thinking', text: '再想想', process: true },
+      { type: 'text', text: '最终回复' },
+    ])
   })
-  it('single bucket (final turn only) carries no process flag', () => {
-    const msg = liveToMessage(live({ texts: [{ index: 0, text: '直接回答' }] }))
-    expect(msg.parts.filter(p => p.type === 'text').map(p => p.process)).toEqual([undefined])
+  it('marks the in-flight segment as process the moment its tool call arrives', () => {
+    let items: LiveItem[] = []
+    items = applyTextDelta(items, 0, '我先查一下')
+    const before = liveToMessage(live({ items }))
+    expect(before.parts.map(p => p.process)).toEqual([undefined]) // 尚无工具：仍在回复位
+    items = applyToolCall(items, 'web_search')
+    const after = liveToMessage(live({ items }))
+    expect(after.parts.map(p => p.process)).toEqual([true, true]) // tool.call 一到即改标
+  })
+  it('single final segment without tools carries no process flag', () => {
+    let items: LiveItem[] = []
+    items = applyTextDelta(items, 0, '直接回答')
+    const msg = liveToMessage(live({ items }))
+    expect(msg.parts.map(p => p.process)).toEqual([undefined])
+  })
+  it('tools between segments keep every non-final segment in the process area', () => {
+    let items: LiveItem[] = []
+    items = applyTextDelta(items, 0, '第一轮')
+    items = applyToolCall(items, 'a')
+    items = applyToolResult(items, 'ok')
+    items = applyTextDelta(items, 1, '第二轮')
+    items = applyToolCall(items, 'b')
+    items = applyTextDelta(items, 2, '最终回复')
+    const msg = liveToMessage(live({ items }))
+    expect(msg.parts.filter(p => p.type === 'text').map(p => p.process)).toEqual([true, true, undefined])
+    // 顺序必须与落库穿插序一致：text → tool → text → tool → text。
+    expect(msg.parts.map(p => p.type)).toEqual(['text', 'tool_call', 'tool_result', 'text', 'tool_call', 'text'])
   })
   it('thinking and tool parts are always process', () => {
-    const msg = liveToMessage(live({
-      thinking: '想',
-      texts: [{ index: 0, text: '答' }],
-      toolCalls: [{ name: 'web_search', status: 'ok', summary: '命中' }],
-    }))
+    let items: LiveItem[] = []
+    items = applyThinkingDelta(items, '想')
+    items = applyTextDelta(items, 0, '答')
+    items = applyToolCall(items, 'web_search')
+    items = applyToolResult(items, 'ok', '命中')
+    const msg = liveToMessage(live({ items }))
     for (const p of msg.parts.filter(p => p.type !== 'text')) expect(p.process).toBe(true)
   })
 })
+
+describe('showProcessInline', () => {
+  it('expands during thinking/acting and collapses the moment responding starts', () => {
+    expect(showProcessInline(live({ phase: 'thinking' }), true)).toBe(true)
+    expect(showProcessInline(live({ phase: 'acting' }), true)).toBe(true)
+    expect(showProcessInline(live({ phase: 'responding' }), true)).toBe(false)
+  })
+  it('falls back to the auto-collapse preference when no live run', () => {
+    expect(showProcessInline(null, true)).toBe(false)
+    expect(showProcessInline(null, false)).toBe(true)
+  })
+})
diff --git a/tsconfig.tsbuildinfo b/tsconfig.tsbuildinfo
index e4fba48..5328699 100644
--- a/tsconfig.tsbuildinfo
+++ b/tsconfig.tsbuildinfo
@@ -1 +1 @@
-{"root":["./src/App.tsx","./src/api.ts","./src/auth.ts","./src/contracts.ts","./src/main.tsx","./src/passwords.ts","./src/store.ts","./src/tasklist.ts","./src/components/AdminUsersModal.tsx","./src/components/AgentTracker.tsx","./src/components/Conversation.tsx","./src/components/DocViewer.tsx","./src/components/LoginPage.tsx","./src/components/SettingsModal.tsx","./src/components/TaskSidebar.tsx","./src/components/Workbench.tsx","./src/components/Workspaces.tsx","./test/auth.test.ts","./test/contracts.test.ts","./test/tasklist.test.ts"],"version":"5.9.3"}
\ No newline at end of file
+{"root":["./src/App.tsx","./src/api.ts","./src/auth.ts","./src/contracts.ts","./src/live.ts","./src/main.tsx","./src/passwords.ts","./src/store.ts","./src/tasklist.ts","./src/components/AdminUsersModal.tsx","./src/components/AgentTracker.tsx","./src/components/Conversation.tsx","./src/components/DocViewer.tsx","./src/components/LoginPage.tsx","./src/components/SettingsModal.tsx","./src/components/TaskSidebar.tsx","./src/components/Workbench.tsx","./src/components/Workspaces.tsx","./test/auth.test.ts","./test/contracts.test.ts","./test/live.test.ts","./test/tasklist.test.ts"],"version":"5.9.3"}
\ No newline at end of file