diff --git a/src/api.ts b/src/api.ts
index 3e17570..5878845 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -137,7 +137,7 @@ export function connectEvents(conversationId: string, since: number, handlers: S
     }
     es.onmessage = ev => handle('message', ev.data)
     // 同时监听具名事件与默认（服务端 event: 字段）。
-    const types = ['message.delta', 'thinking.delta', 'tool.call', 'tool.result', 'run.phase',
+    const types = ['message.delta', 'thinking.delta', 'tool.call.delta', 'tool.call', 'tool.output', 'tool.result', 'run.phase',
       'hitl.request', 'hitl.resolved', 'plan.update', 'todo.update', 'agent.spawn', 'agent.progress',
       'agent.result', 'artifact.created', 'artifact.updated', 'run.completed', 'run.failed', 'error',
       'card.created', 'card.updated', 'card.status', 'card.resolved']
diff --git a/src/components/Conversation.tsx b/src/components/Conversation.tsx
index 4b7f21c..c4d7b1c 100644
--- a/src/components/Conversation.tsx
+++ b/src/components/Conversation.tsx
@@ -1,17 +1,17 @@
 // 中栏：消息流（Part 渲染器注册表）+ 流式渲染 + 过程折叠 + HITL 卡片 + 输入区（4.4）。
 // 重设计方案 阶段④：折叠区全部迁 @ui Collapsible（<details> 已禁）；工具调用块走
 // ToolBlock 契约（运行态扫光、完成边沿收起、展开态记忆）；live 行扫光 + 已工作计时。
-import { Icon, Avatar, BrandMark, Collapsible } from '@ui'
+import { Icon, Avatar, BrandMark, Collapsible, getPersistedOpen, setPersistedOpen } from '@ui'
 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 { scrollRatio, scrollTopForRatio } from '../scrollsync'
-import { liveToMessage, showProcessInline } from '../live'
+import { liveToMessage, livePhaseLabel, showProcessInline } from '../live'
 import type { Message, Part, HITLCard, ActivityCard, Artifact } from '../contracts'
 import { UIRenderer, InlineConfirmCard, hasOpenConfirm, CardAnchor } from '@ui'
 import { docBridge } from './Workbench'
-import { splitTimeline, artifactIcon, humanSize, artifactIdsIn, markMissingArtifacts, workedLabel } from '../messageparts'
+import { splitTimeline, artifactIcon, humanSize, artifactIdsIn, markMissingArtifacts, dedupeDeliverables, foldRunErrors, processSummary, humanError } from '../messageparts'
 import { ProcessTimeline } from './ProcessTimeline'
 
 function hasFiles(dt: DataTransfer | null): boolean {
@@ -63,8 +63,21 @@ function PartView({ part, live }: { part: Part; live?: boolean | null }) {
         </div>
       )
     }
-    case 'error':
-      return <div className="part-error">{part.error?.code}: {part.error?.message}</div>
+    case 'error': {
+      const view = humanError(part.error?.code, part.error?.message)
+      return (
+        <div className="part-error">
+          <div>{view.title}</div>
+          {view.detail && (
+            <Collapsible id={`err:${part.error?.code ?? 'e'}:${view.detail.length}`} triggerClassName="process-collapse-summary"
+              trigger={<><span className="process-collapse-chev">▸</span>详情</>}>
+              <div className="part-error-detail">{view.detail}</div>
+            </Collapsible>
+          )}
+          <button type="button" className="btn ghost" onClick={() => { void store.sendMessage('继续', []) }}>继续执行</button>
+        </div>
+      )
+    }
     default:
       return null
   }
@@ -105,7 +118,7 @@ function ThinkingBlock({ part, idKey, defaultOpen }: { part: Part; idKey: string
 }
 
 // 交付物卡片：主区域和「预览」打开预览区；下载收进菜单，避免和预览抢同一个按钮。
-function DeliverableCard({ artifact }: { artifact: { artifactId: string; name: string; kind?: string } }) {
+function DeliverableCard({ artifact, updates = 0 }: { artifact: { artifactId: string; name: string; kind?: string }; updates?: number }) {
   const [menu, setMenu] = useState(false)
   const art = findArtifact(artifact.artifactId)
   const name = artifact.name || art?.name || '文件'
@@ -118,7 +131,7 @@ function DeliverableCard({ artifact }: { artifact: { artifactId: string; name: s
         <span className="dc-icon"><Icon name={icon} size={18} /></span>
         <span className="dc-main">
           <span className="dc-name">{name}</span>
-          <span className="dc-meta">{kindLabelOf(artifact.kind ?? art?.kind)}{size ? ` · ${size}` : ''}{art ? '' : ' · 生成中'}</span>
+          <span className="dc-meta">{kindLabelOf(artifact.kind ?? art?.kind)}{size ? ` · ${size}` : ''}{updates > 0 ? ` · 已更新 ${updates} 次` : ''}{art ? '' : ' · 生成中'}</span>
         </span>
       </button>
       <button type="button" className="dc-act" onClick={open} disabled={!art}>预览</button>
@@ -149,6 +162,15 @@ function citedArtifactCards(parts: Part[]): Artifact[] {
 }
 
 // 已工作计时（ZCode「已工作 X 分 X 秒」摘要行；1s 步进，仅 live 期间挂载）。
+function useLiveClock(active: boolean) {
+  const [, tick] = useState(0)
+  useEffect(() => {
+    if (!active) return
+    const t = window.setInterval(() => tick(n => n + 1), 1000)
+    return () => window.clearInterval(t)
+  }, [active])
+}
+
 function useElapsed(startedAt: number): string {
   const [, tick] = useState(0)
   useEffect(() => {
@@ -166,29 +188,53 @@ function LiveBar({ live }: { live: LiveState }) {
   return (
     <span className="live-bar">
       <span className="live-dot" />
-      <span className="mk-sweep">{live.phase}</span>
+      <span className="mk-sweep">{livePhaseLabel(live)}</span>
       <span className="live-elapsed">已工作 {elapsed}</span>
     </span>
   )
 }
 
+// 用户在运行中手动折过的 run：结束后沿用这次选择，不强制再收起。
+const touchedProcess = new Set<string>()
+
 function AssistantMessage({ msg, live }: { msg: Message; live?: LiveState | null }) {
   const autoCollapse = useStore(s => s.ui.autoCollapseProcess)
   const ctxObs = useStore(s => (msg.runId ? s.contextObs[msg.runId] : undefined))
   const run = useStore(s => (msg.runId ? s.runs.find(r => r.id === msg.runId) : undefined))
   const parts = msg.parts ?? []
-  const split = useMemo(() => splitTimeline(parts), [parts])
-  // 运行中时间线一直展开。终轮确认没有后续工具调用之后，才按偏好收成「已工作 X」。
+  useLiveClock(!!live)
+  const finished = !live && !!run && run.status !== 'running' && run.status !== 'pending' && run.status !== 'waiting_hitl'
+  const split = useMemo(() => splitTimeline(parts, finished), [parts, finished])
   const showProcess = showProcessInline(live ?? null, autoCollapse)
+  const memKey = `process:${msg.runId || msg.id}`
+  const touched = !!(msg.runId && touchedProcess.has(msg.runId))
+  const [open, setOpen] = useState(() => {
+    if (live && !touched) return true
+    if (touched) return getPersistedOpen(memKey)
+    return showProcess
+  })
+  useEffect(() => {
+    if (live && msg.runId && !touchedProcess.has(msg.runId)) setOpen(true)
+  }, [live, msg.runId])
   const extras = citedArtifactCards(split.final)
+  const cards = dedupeDeliverables(split.final)
   const lastText = (() => {
     for (let i = split.final.length - 1; i >= 0; i--) if (split.final[i].type === 'text') return i
     return -1
   })()
+  const streamingText = !!(live && live.phase === 'responding' && lastText >= 0
+    && !live.items.some(it => it.kind === 'tool' && it.state !== 'done'))
+  const toolCount = split.timeline.filter(p => p.type === 'tool_call').length
+  const headline = live ? livePhaseLabel(live) : processSummary(toolCount, cards.length, run?.createdAt, run?.endedAt)
   const timeline = (
     <ProcessTimeline parts={split.timeline} live={!!live} idKey={msg.id}
       renderPart={(part, liveText) => <PartView part={part} live={liveText} />} />
   )
+  const toggleProcess = (next: boolean) => {
+    if (msg.runId) touchedProcess.add(msg.runId)
+    setPersistedOpen(memKey, next)
+    setOpen(next)
+  }
   return (
     <div className="msg assistant" data-msg-id={msg.id}>
       <div className="msg-role">
@@ -196,23 +242,24 @@ function AssistantMessage({ msg, live }: { msg: Message; live?: LiveState | null
         <span>助手</span>
         {live && <LiveBar live={live} />}
       </div>
-      {split.timeline.length > 0 && (showProcess
-        ? <div className="part-group">{timeline}</div>
-        : (
-          <div className="process-collapse">
-            <Collapsible id={`process:${msg.id}`} triggerClassName="process-collapse-summary" unmountDelay={300}
-              trigger={<>
-                <span className="process-collapse-chev">▸</span>
-                <span>{workedLabel(run?.createdAt, run?.endedAt)}</span>
-              </>}>
-              <div className="body">{timeline}</div>
-            </Collapsible>
-          </div>
-        ))}
-      {split.final.map((part, i) => (
-        <div className="part" key={i}>
-          <PartView part={part} live={!!(live && i === lastText && part.type === 'text')} />
+      {split.timeline.length > 0 && (
+        <div className="process-collapse">
+          <Collapsible id={memKey} open={open} onToggle={toggleProcess} triggerClassName="process-collapse-summary" unmountDelay={300}
+            trigger={<>
+              <span className="process-collapse-chev">▸</span>
+              <span className={live ? 'mk-sweep' : ''}>{headline}</span>
+            </>}>
+            <div className="body">{timeline}</div>
+          </Collapsible>
         </div>
+      )}
+      {split.final.map((part, i) => part.type === 'artifact_ref' ? null : (
+        <div className="part" key={i}>
+          <PartView part={part} live={!!(streamingText && i === lastText && part.type === 'text')} />
+        </div>
+      ))}
+      {cards.map(card => (
+        <DeliverableCard key={card.artifact.artifactId} artifact={card.artifact} updates={card.updates} />
       ))}
       {extras.map(art => (
         <DeliverableCard key={art.id} artifact={{ artifactId: art.id, name: art.name, kind: art.kind }} />
@@ -379,6 +426,8 @@ export function Conversation() {
   const [attachmentNames, setAttachmentNames] = useState<string[]>([])
   const [dragDepth, setDragDepth] = useState(0)
   const bodyRef = useRef<HTMLDivElement>(null)
+  const stickRef = useRef(true)
+  const [showJump, setShowJump] = useState(false)
 
   artifactCache = Object.fromEntries(artifacts.map(a => [a.id, a]))
   cardCache = Object.fromEntries(cards.map(c => [c.id, c]))
@@ -386,6 +435,7 @@ export function Conversation() {
   const active = activeRun(runs)
 
   useEffect(() => {
+    if (!stickRef.current) return
     bodyRef.current?.scrollTo({ top: bodyRef.current.scrollHeight })
   }, [messages.length, live?.items, live?.phase, activeHitl.length])
 
@@ -457,6 +507,10 @@ export function Conversation() {
         onScroll={() => {
           const src = bodyRef.current
           if (!src) return
+          const dist = src.scrollHeight - src.scrollTop - src.clientHeight
+          const stick = dist < 80
+          stickRef.current = stick
+          setShowJump(prev => (prev === !stick ? prev : !stick))
           const ratio = scrollRatio(src)
           if (ratio === null) return
           const dst = document.querySelector('[data-scroll-sync="inbox"]')
@@ -465,7 +519,7 @@ export function Conversation() {
           if (top === null) return
           dst.scrollTop = top
         }}>
-        {messages.filter(m => m.role !== 'assistant' || !m.runId || runs.find(r => r.id === m.runId)?.kind !== 'subagent').map(m => {
+        {foldRunErrors(messages.filter(m => m.role !== 'assistant' || !m.runId || runs.find(r => r.id === m.runId)?.kind !== 'subagent')).map(m => {
           if (m.role === 'user') {
             // 内联确认卡（T3）：锚定本消息的危险命令确认，双现于对话流与收件箱。
             const anchored = cards.filter(c => c.anchorMessageId === m.id && c.kind === 'confirm')
@@ -496,6 +550,13 @@ export function Conversation() {
           {runtimeMock && <div style={{ fontSize: 'var(--fs-ui-sm)', color: 'var(--text-faint)' }}>mock 模式演示指令：#hitl · #agents · #doc · #error　·　命令：/help</div>}
         </div>}
       </div>
+      {showJump && (
+        <button type="button" className="jump-bottom" onClick={() => {
+          stickRef.current = true
+          setShowJump(false)
+          bodyRef.current?.scrollTo({ top: bodyRef.current.scrollHeight })
+        }}>回到底部</button>
+      )}
 
       <div className="input-bar">
         <OutboxPanel />
diff --git a/src/components/ProcessTimeline.tsx b/src/components/ProcessTimeline.tsx
index 7f1c31a..b906361 100644
--- a/src/components/ProcessTimeline.tsx
+++ b/src/components/ProcessTimeline.tsx
@@ -1,10 +1,10 @@
 // 工作时间线：思考、对用户的解说、同类工具合并成一行。运行中展开；
 // 终轮结束后由调用方套进「已工作 X」折叠。
 import type { ReactNode } from 'react'
-import { Collapsible } from '@ui'
+import { Collapsible, ToolBlock } from '@ui'
 import type { Part } from '../contracts'
-import { formatDuration } from '../messageparts'
-import { timelineEntries, toolGroupLabel } from '../toolkind'
+import { formatDuration, humanSize } from '../messageparts'
+import { timelineEntries, toolGroupLabel, toolTail, type ToolGroupItem } from '../toolkind'
 
 export function ProcessTimeline({ parts, live, idKey, renderPart }: {
   parts: Part[]
@@ -33,6 +33,9 @@ export function ProcessTimeline({ parts, live, idKey, renderPart }: {
         if (row.kind === 'text') {
           return <div className="part" key={`${idKey}:tx:${i}`}>{renderPart({ type: 'text', text: row.text }, false)}</div>
         }
+        if (row.kind === 'toolblock') {
+          return <ToolCallBlock key={`${idKey}:tb:${i}`} item={row.item} />
+        }
         if (row.kind === 'tools') {
           const running = row.items.some(it => it.running)
           return (
@@ -55,3 +58,33 @@ export function ProcessTimeline({ parts, live, idKey, renderPart }: {
     </div>
   )
 }
+
+function sizeLabel(n: number): string {
+  if (n < 1024) return `${n} 字符`
+  return humanSize(n)
+}
+
+function ToolCallBlock({ item }: { item: ToolGroupItem }) {
+  const composing = item.phase === 'composing'
+  const tail = item.running ? toolTail(item.arguments, item.output) : ''
+  const dur = !item.running ? formatDuration(item.durationMs) : ''
+  const detail = composing ? undefined : (dur ? `${item.headline} · ${dur}` : item.headline)
+  return (
+    <div className="tl-toolblock">
+      <ToolBlock
+        toolId={item.id}
+        name={item.name}
+        detail={detail}
+        running={item.running}
+        status={item.status}
+        statusText={composing ? `编写中 · ${sizeLabel(item.arguments?.length ?? 0)}` : undefined}
+        statusDetail={item.summary}
+        autoCollapseOnComplete
+      >
+        {item.arguments && <pre className="tool-preview">{item.arguments}</pre>}
+        {item.output && <pre className="tool-preview">{item.output}</pre>}
+      </ToolBlock>
+      {tail && <pre className="tool-live-preview">{tail}</pre>}
+    </div>
+  )
+}
diff --git a/src/contracts.ts b/src/contracts.ts
index 46572ba..425692e 100644
--- a/src/contracts.ts
+++ b/src/contracts.ts
@@ -80,7 +80,8 @@ export interface TodoList {
 // ---- 流式事件 ----
 
 export type StreamEventType =
-  | 'message.delta' | 'thinking.delta' | 'tool.call' | 'tool.result'
+  | 'message.delta' | 'thinking.delta'
+  | 'tool.call.delta' | 'tool.call' | 'tool.output' | 'tool.result'
   | 'run.phase' | 'hitl.request' | 'hitl.resolved' | 'plan.update' | 'todo.update'
   | 'agent.spawn' | 'agent.progress' | 'agent.result'
   | 'artifact.created' | 'artifact.updated'
@@ -94,6 +95,9 @@ export interface StreamEvent<P = unknown> {
 
 // payload 形状（按 type 判别；未知字段忽略）
 export interface MessageDeltaPayload { index: number; text: string }
+export interface ToolCallDeltaPayload { index: number; callId?: string; name?: string; delta: string }
+export interface ToolOutputPayload { callId: string; stream: 'stdout' | 'stderr'; text: string }
+export interface ToolResultPayload { callId: string; status: string; summary?: string; truncated?: boolean; durationMs?: number }
 export interface AgentSpawnPayload { agentRun: ID; name: string; task: string }
 export interface AgentProgressPayload { agentRun: ID; note?: string; phase?: RunPhase }
 export interface AgentResultPayload { agentRun: ID; status: RunStatus; summary?: string }
diff --git a/src/live.ts b/src/live.ts
index 2b59be1..ff94eb8 100644
--- a/src/live.ts
+++ b/src/live.ts
@@ -1,21 +1,40 @@
 // 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）。
+// 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。
+// 参数增量（编写中）一到即算工具，解说不用等工具真正开始执行才离开回复区。
 import type { Message, Part } from './contracts'
 import type { LiveState } from './store'
 
+export type ToolLiveState = 'composing' | 'running' | 'done'
+
 // 到达序部件流的元素。
 export type LiveItem =
   | { kind: 'thinking'; text: string; startedAt: number; endedAt: number }
   | { kind: 'text'; index: number; text: string }
-  | { kind: 'tool'; callId?: string; name: string; status?: string; summary?: string }
+  | {
+      kind: 'tool'
+      callId?: string
+      index?: number
+      name: string
+      args: string
+      state: ToolLiveState
+      startedAt: number
+      endedAt: number
+      output: string
+      status?: string
+      summary?: string
+    }
   | { kind: 'artifact'; artifact: { artifactId: string; name: string; kind?: string } }
 
+export type LiveTool = Extract<LiveItem, { kind: 'tool' }>
+
+const OUTPUT_TAIL = 4096
+
+function isTool(it: LiveItem): it is LiveTool {
+  return it.kind === 'tool'
+}
+
 // 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）。
 // now 供测试固定首尾时间；缺省用墙上时钟，durationMs = endedAt - startedAt。
 export function applyThinkingDelta(items: LiveItem[], delta: string, now = Date.now()): LiveItem[] {
@@ -39,34 +58,109 @@ export function applyTextDelta(items: LiveItem[], index: number, delta: string):
   return [...items, { kind: 'text', index, text: delta }]
 }
 
-export function applyToolCall(items: LiveItem[], name: string, callId?: string): LiveItem[] {
-  return [...items, { kind: 'tool', callId, name }]
-}
-
-// applyArtifactCreated 追加工件引用（artifact.created 事件）。投影时作为
-// 交付物钉在消息尾部（内容部件，不进过程折叠）——与落库序同构。
-export function applyArtifactCreated(items: LiveItem[], artifact: { artifactId: string; name: string; kind?: string }): LiveItem[] {
-  return [...items, { kind: 'artifact', artifact }]
-}
-
-// applyToolResult 回填对应工具（优先按 callId 配对，回落到最近一个未决工具——
-// 与落库的尾部配对语义一致）。
-export function applyToolResult(items: LiveItem[], callId: string | undefined, status: string, summary?: string): LiveItem[] {
+// applyToolCallDelta 并入正在编写的参数。同 index（或同 callId）的编写中条目追加，否则新开一条。
+export function applyToolCallDelta(items: LiveItem[], index: number, delta: string, callId?: string, name?: string, now = Date.now()): LiveItem[] {
   for (let i = items.length - 1; i >= 0; i--) {
     const it = items[i]
-    if (it.kind !== 'tool' || it.status !== undefined) continue
-    if (callId && it.callId && it.callId !== callId) continue
+    if (!isTool(it) || it.state !== 'composing') continue
+    if (it.index !== index && !(callId && it.callId === callId)) continue
     const out = items.slice()
-    out[i] = { kind: 'tool', callId: it.callId, name: it.name, status, summary }
+    out[i] = {
+      ...it,
+      args: it.args + delta,
+      callId: callId || it.callId,
+      name: name || it.name,
+      endedAt: now,
+    }
+    return out
+  }
+  return [...items, {
+    kind: 'tool', index, callId, name: name || '工具', args: delta,
+    state: 'composing', startedAt: now, endedAt: now, output: '',
+  }]
+}
+
+// applyToolCall 把一条调用标成运行中。优先按 callId 接上编写中的条目，否则接第一条编写中的条目。
+export function applyToolCall(items: LiveItem[], name: string, callId?: string, args?: string, now = 0): LiveItem[] {
+  let idx = -1
+  if (callId) {
+    for (let i = 0; i < items.length; i++) {
+      const it = items[i]
+      if (isTool(it) && it.state === 'composing' && it.callId === callId) { idx = i; break }
+    }
+  }
+  if (idx < 0) {
+    for (let i = 0; i < items.length; i++) {
+      const it = items[i]
+      if (isTool(it) && it.state === 'composing') { idx = i; break }
+    }
+  }
+  if (idx >= 0) {
+    const it = items[idx] as LiveTool
+    const out = items.slice()
+    out[idx] = {
+      ...it,
+      name: name || it.name,
+      callId: callId || it.callId,
+      args: args || it.args,
+      state: 'running',
+      startedAt: now || it.startedAt,
+      endedAt: now,
+    }
+    return out
+  }
+  return [...items, {
+    kind: 'tool', callId, name, args: args ?? '', state: 'running',
+    startedAt: now, endedAt: now, output: '',
+  }]
+}
+
+// applyToolOutput 把执行中的输出追加到对应工具，只保留尾部，避免长日志撑住内存。
+export function applyToolOutput(items: LiveItem[], callId: string | undefined, text: string): LiveItem[] {
+  for (let i = items.length - 1; i >= 0; i--) {
+    const it = items[i]
+    if (!isTool(it) || it.state === 'done') continue
+    if (callId && it.callId && it.callId !== callId) continue
+    let output = it.output + text
+    if (output.length > OUTPUT_TAIL) output = output.slice(output.length - OUTPUT_TAIL)
+    const out = items.slice()
+    out[i] = { ...it, output }
     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。
+// applyToolResult 回填对应工具（优先按 callId 配对，回落到最近一个未决工具）。
+export function applyToolResult(items: LiveItem[], callId: string | undefined, status: string, summary?: string, now = 0): LiveItem[] {
+  for (let i = items.length - 1; i >= 0; i--) {
+    const it = items[i]
+    if (!isTool(it) || it.state === 'done') continue
+    if (callId && it.callId && it.callId !== callId) continue
+    const out = items.slice()
+    out[i] = { ...it, callId: it.callId, name: it.name, status, summary, state: 'done', endedAt: now || it.endedAt }
+    return out
+  }
+  return items
+}
+
+export function applyArtifactCreated(items: LiveItem[], artifact: { artifactId: string; name: string; kind?: string }): LiveItem[] {
+  return [...items, { kind: 'artifact', artifact }]
+}
+
+export function applyArtifactUpdated(items: LiveItem[], artifact: { artifactId: string; name: string; kind?: string }): LiveItem[] {
+  const out = items.slice()
+  for (let i = out.length - 1; i >= 0; i--) {
+    const it = out[i]
+    if (it.kind === 'artifact' && it.artifact.artifactId === artifact.artifactId) {
+      out[i] = { kind: 'artifact', artifact: { ...it.artifact, ...artifact } }
+      return out
+    }
+  }
+  return [...out, { kind: 'artifact', artifact }]
+}
+
+// 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。
 export function liveToMessage(live: LiveState): Message {
-  // 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
@@ -85,14 +179,24 @@ export function liveToMessage(live: LiveState): Message {
         ...(durationMs > 0 ? { durationMs } : {}),
       })
     } else if (it.kind === 'tool') {
-      parts.push({ type: 'tool_call', process: true, toolCall: { id: it.callId ?? '', name: it.name } })
-      if (it.status !== undefined) {
-        parts.push({ type: 'tool_result', process: true, toolCall: { id: it.callId ?? '', name: it.name },
-          toolResult: { callId: it.callId ?? '', status: it.status === 'error' ? 'error' : 'ok', summary: it.summary } })
+      const durationMs = it.state === 'done' ? it.endedAt - it.startedAt : 0
+      const call = {
+        id: it.callId ?? '',
+        name: it.name,
+        ...(it.args ? { arguments: it.args } : {}),
+        ...(durationMs > 0 ? { durationMs } : {}),
+      }
+      parts.push({
+        type: 'tool_call', process: true, toolCall: call,
+        toolPhase: it.state, ...(it.output ? { toolOutput: it.output } : {}),
+      } as Part)
+      if (it.state === 'done') {
+        parts.push({
+          type: 'tool_result', process: true, toolCall: { id: call.id, name: call.name },
+          toolResult: { callId: call.id, status: it.status === 'error' ? 'error' : 'ok', summary: it.summary },
+        })
       }
     } else if (it.kind === 'artifact') {
-      // 交付物卡片：内容部件，投影钉尾（落库侧 llm.go 同序——最终正文之后），
-      // 流式期间即可在消息底部看到"文件已生成"卡片。
       deliverables.push({ type: 'artifact_ref', artifact: it.artifact })
     } else {
       parts.push({ type: 'text', text: it.text, process: textProcess.get(i) || undefined })
@@ -102,8 +206,27 @@ export function liveToMessage(live: LiveState): Message {
   return { id: `live:${live.runId}`, conversationId: '', role: 'assistant', runId: live.runId, parts, createdAt: '' }
 }
 
-// showProcessInline：运行中时间线始终展开（不能靠 responding 提前折，那一轮文字
-// 后面还可能再调用工具）。run 结束后随「自动折叠过程」偏好收成一行。
+// livePhaseLabel 用最后一个实时条目给出中文阶段，而不是后端的英文 phase。
+export function livePhaseLabel(live: LiveState, now = Date.now()): string {
+  let last: LiveItem | undefined
+  for (let i = live.items.length - 1; i >= 0; i--) {
+    if (live.items[i].kind !== 'artifact') { last = live.items[i]; break }
+  }
+  if (!last || last.kind === 'thinking') return '思考中'
+  if (last.kind === 'tool') {
+    if (last.state === 'composing') return `正在编写 ${last.name}`
+    if (last.state === 'running') {
+      const s = Math.max(0, Math.floor((now - last.startedAt) / 1000))
+      const m = Math.floor(s / 60)
+      const clock = m > 0 ? `${m} 分 ${s % 60} 秒` : `${s} 秒`
+      return `正在运行 ${last.name} · ${clock}`
+    }
+    return '回复中'
+  }
+  return '回复中'
+}
+
+// showProcessInline：运行中时间线始终展开。run 结束后随「自动折叠过程」偏好收成一行。
 export function showProcessInline(live: LiveState | null, autoCollapse: boolean): boolean {
   return live != null || !autoCollapse
 }
diff --git a/src/messageparts.ts b/src/messageparts.ts
index f20b0a8..b571e4d 100644
--- a/src/messageparts.ts
+++ b/src/messageparts.ts
@@ -7,12 +7,90 @@ export interface TimelineSplit {
   final: Part[]
 }
 
-/** 最后一个 process 部件之前（含自身）是工作时间线，其余是最终回复。 */
-export function splitTimeline(parts: Part[]): TimelineSplit {
+/** 最后一个 process 部件之前（含自身）是工作时间线，其余是最终回复。
+ * promoteLastText：回复区没有正文时，把时间线里最后一段解说提上来。失败或被截断的 run 用它保住可见回复。 */
+export function splitTimeline(parts: Part[], promoteLastText = false): TimelineSplit {
   let last = -1
   for (let i = 0; i < parts.length; i++) if (parts[i].process) last = i
   if (last < 0) return { timeline: [], final: parts }
-  return { timeline: parts.slice(0, last + 1), final: parts.slice(last + 1) }
+  const timeline = parts.slice(0, last + 1)
+  const final = parts.slice(last + 1)
+  if (!promoteLastText || final.some(p => p.type === 'text' && (p.text ?? '').trim())) return { timeline, final }
+  let textAt = -1
+  for (let i = timeline.length - 1; i >= 0; i--) {
+    if (timeline[i].type === 'text' && (timeline[i].text ?? '').trim()) { textAt = i; break }
+  }
+  if (textAt < 0) return { timeline, final }
+  const lifted = { ...timeline[textAt], process: undefined }
+  return { timeline: timeline.filter((_, i) => i !== textAt), final: [lifted, ...final] }
+}
+
+/** 同一轮里同名工件只留最新一张，updates 是被折叠掉的次数。 */
+export function dedupeDeliverables(parts: Part[]): { artifact: NonNullable<Part['artifact']>; updates: number }[] {
+  const order: string[] = []
+  const byName = new Map<string, { artifact: NonNullable<Part['artifact']>; count: number }>()
+  for (const p of parts) {
+    if (p.type !== 'artifact_ref' || !p.artifact) continue
+    const name = p.artifact.name || p.artifact.artifactId
+    const cur = byName.get(name)
+    if (!cur) {
+      order.push(name)
+      byName.set(name, { artifact: p.artifact, count: 1 })
+    } else {
+      cur.artifact = p.artifact
+      cur.count++
+    }
+  }
+  return order.map(name => {
+    const cur = byName.get(name)!
+    return { artifact: cur.artifact, updates: cur.count - 1 }
+  })
+}
+
+/** 把单独成条的错误消息并回同一 run 的助手消息。没有正文的错误条保留原位。 */
+export function foldRunErrors<T extends { id: string; runId?: string; role: string; parts: Part[] }>(messages: T[]): T[] {
+  const extras = new Map<string, Part[]>()
+  for (const m of messages) {
+    if (m.role !== 'assistant' || !m.runId) continue
+    if (m.parts.length > 0 && m.parts.every(p => p.type === 'error')) {
+      extras.set(m.runId, [...(extras.get(m.runId) ?? []), ...m.parts])
+    }
+  }
+  const used = new Set<string>()
+  const out: T[] = []
+  for (const m of messages) {
+    if (m.role === 'assistant' && m.runId && extras.has(m.runId) && m.parts.every(p => p.type === 'error')) {
+      const hasBody = messages.some(o => o !== m && o.runId === m.runId && o.role === 'assistant' && o.parts.some(p => p.type !== 'error'))
+      if (hasBody) continue
+    }
+    if (m.role === 'assistant' && m.runId && extras.has(m.runId) && m.parts.some(p => p.type !== 'error') && !used.has(m.runId)) {
+      used.add(m.runId)
+      out.push({ ...m, parts: [...m.parts, ...extras.get(m.runId)!] })
+      continue
+    }
+    out.push(m)
+  }
+  return out
+}
+
+/** 把运行错误说成人话。detail 保留原始码，供展开查看。 */
+export function humanError(code?: string, message?: string): { title: string; detail: string } {
+  const msg = (message ?? '').trim()
+  const detail = [code, msg].filter(Boolean).join(': ')
+  if (code === 'run.cancelled' || msg === '已取消') return { title: '已取消', detail }
+  const stripped = msg.replace(/^budget:\s*/, '')
+  if (msg.startsWith('budget:') || /max turns|maxTurns|tool calls/i.test(msg)) {
+    return { title: `已停止：${stripped}`, detail }
+  }
+  return { title: msg ? `已停止：${msg}` : '已停止', detail }
+}
+
+/** 终态摘要：已工作时长，以及工具次数和文件数。 */
+export function processSummary(toolCalls: number, files: number, createdAt?: string, endedAt?: string): string {
+  const bits = [workedLabel(createdAt, endedAt)]
+  if (toolCalls > 0) bits.push(`${toolCalls} 次工具调用`)
+  if (files > 0) bits.push(`${files} 个文件`)
+  return bits.join(' · ')
 }
 
 const ART_ID = /art_[0-9a-f]{12}/g
diff --git a/src/store.ts b/src/store.ts
index 314f7d5..5747bdc 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, applyThinkingDelta, applyToolCall, applyToolResult, applyArtifactCreated, type LiveItem } from './live'
+import { applyTextDelta, applyThinkingDelta, applyToolCall, applyToolCallDelta, applyToolResult, applyToolOutput, applyArtifactCreated, applyArtifactUpdated, type LiveItem } from './live'
 import { closePreviewTab, openPreviewTab, type PreviewTab } from './previewtabs'
 import { enqueueMessage, enqueueMessageFront, newQueuedMessage, promoteQueuedMessage, removeQueuedMessage, replaceQueuedText, type QueuedMessage } from './outbox'
 import { flashElement } from './scrollsync'
@@ -354,14 +354,24 @@ export const store = {
         set({ live: touchLive(e.runId ?? '', l => { l.items = applyThinkingDelta(l.items, p.text) }) })
         break
       }
+      case 'tool.call.delta': {
+        const p = e.payload as { index: number; callId?: string; name?: string; delta: string }
+        set({ live: touchLive(e.runId ?? '', l => { l.items = applyToolCallDelta(l.items, p.index, p.delta, p.callId, p.name) }) })
+        break
+      }
       case 'tool.call': {
-        const p = e.payload as { callId: string; name: string }
-        set({ live: touchLive(e.runId ?? '', l => { l.items = applyToolCall(l.items, p.name, p.callId) }) })
+        const p = e.payload as { callId: string; name: string; arguments?: string }
+        set({ live: touchLive(e.runId ?? '', l => { l.items = applyToolCall(l.items, p.name, p.callId, p.arguments, Date.now()) }) })
+        break
+      }
+      case 'tool.output': {
+        const p = e.payload as { callId?: string; text: string }
+        set({ live: touchLive(e.runId ?? '', l => { l.items = applyToolOutput(l.items, p.callId, p.text) }) })
         break
       }
       case 'tool.result': {
         const p = e.payload as { callId: string; status: string; summary?: string }
-        set({ live: touchLive(e.runId ?? '', l => { l.items = applyToolResult(l.items, p.callId, p.status, p.summary) }) })
+        set({ live: touchLive(e.runId ?? '', l => { l.items = applyToolResult(l.items, p.callId, p.status, p.summary, Date.now()) }) })
         break
       }
       case 'run.phase': {
@@ -421,11 +431,13 @@ export const store = {
         set({ cards })
         break
       }
-      case 'artifact.created': {
+      case 'artifact.created':
+      case 'artifact.updated': {
         const p = e.payload as { artifact?: { id: string; name: string; kind?: string } }
         if (p?.artifact) {
+          const ref = { artifactId: p.artifact.id, name: p.artifact.name, kind: p.artifact.kind }
           set({ live: touchLive(e.runId ?? '', l => {
-            l.items = applyArtifactCreated(l.items, { artifactId: p.artifact!.id, name: p.artifact!.name, kind: p.artifact!.kind })
+            l.items = e.type === 'artifact.updated' ? applyArtifactUpdated(l.items, ref) : applyArtifactCreated(l.items, ref)
           }) })
         }
         if (state.currentProjectId) store.refreshArtifacts(state.currentProjectId)
diff --git a/src/styles.css b/src/styles.css
index 963105b..af403ad 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -92,6 +92,12 @@ button { font-family: inherit; font-size: inherit; color: inherit; }
 .chat-header { padding: 12px 22px; border-bottom: 1px solid var(--border-soft); display: flex; align-items: center; gap: 10px; background: var(--bg); border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
 .chat-title { font-weight: 600; font-size: var(--fs-ui-base); letter-spacing: -0.01em; flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
 .chat-body { flex: 1; overflow-y: auto; min-height: 0; padding: 22px max(22px, 13%); }
+.jump-bottom {
+  position: absolute; left: 50%; bottom: 92px; transform: translateX(-50%); z-index: 4;
+  border: 1px solid var(--border); background: var(--bg-raised); color: var(--text);
+  border-radius: var(--radius-full); padding: 6px 14px; font-size: var(--fs-ui-sm);
+  box-shadow: var(--shadow-md); cursor: pointer;
+}
 .drop-veil {
   position: absolute; inset: 8px; z-index: 5; pointer-events: none;
   display: flex; align-items: center; justify-content: center;
@@ -145,6 +151,12 @@ button { font-family: inherit; font-size: inherit; color: inherit; }
 .part-text hr { border: none; border-top: 1px solid var(--border); margin: 0.8em 0; }
 .part-text a { color: var(--accent); }
 .part-error { color: var(--err); background: var(--err-soft); border: 1px solid var(--err); border-radius: var(--radius-sm); padding: 8px 12px; }
+.part-error-detail { margin-top: 8px; color: var(--text-dim); font-size: var(--fs-ui-sm); }
+.tool-preview, .tool-live-preview {
+  margin: 0; white-space: pre-wrap; font-family: var(--mono); font-size: var(--fs-ui-sm);
+  color: var(--text-dim); max-height: 8em; overflow: auto;
+}
+.tool-live-preview { margin-top: 6px; }
 .artifact-chip { display: inline-flex; align-items: stretch; background: var(--bg-panel); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; font-size: var(--fs-ui-caption); margin: 2px 0; }
 .artifact-chip .ac-main { display: inline-flex; align-items: center; gap: 7px; color: var(--accent); background: none; border: none; padding: 5px 10px; cursor: pointer; font: inherit; max-width: 340px; }
 .artifact-chip .ac-main span, .artifact-chip .ac-main { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
diff --git a/src/toolkind.ts b/src/toolkind.ts
index d16ef5e..e3686b2 100644
--- a/src/toolkind.ts
+++ b/src/toolkind.ts
@@ -37,6 +37,14 @@ function argOf(raw: string | undefined, keys: string[]): string {
   return ''
 }
 
+/** 编写时看脚本尾部，运行后有输出则改看输出尾部。 */
+export function toolTail(args?: string, output?: string): string {
+  const script = argOf(args, ['script', 'command', 'cmd'])
+  const body = (output && output.trim()) ? output : (script || args || '')
+  const lines = body.split('\n').filter((line, i, all) => line.trim() || i === all.length - 1)
+  return lines.slice(-6).join('\n')
+}
+
 function firstLine(s: string): string {
   const line = s.split('\n').map(x => x.trim()).find(Boolean) ?? ''
   return line.length > 80 ? `${line.slice(0, 80)}…` : line
@@ -79,8 +87,13 @@ export function toolGroupLabel(kind: ToolKind, count: number, running: boolean):
 }
 
 export interface ToolGroupItem {
+  id: string
   name: string
   headline: string
+  arguments?: string
+  output?: string
+  phase?: 'composing' | 'running' | 'done'
+  durationMs?: number
   status?: 'ok' | 'error'
   summary?: string
   running: boolean
@@ -90,8 +103,34 @@ export type TimelineEntry =
   | { kind: 'thinking'; text: string; durationMs?: number; active: boolean }
   | { kind: 'text'; text: string }
   | { kind: 'tools'; toolKind: ToolKind; items: ToolGroupItem[] }
+  | { kind: 'toolblock'; toolKind: ToolKind; item: ToolGroupItem }
   | { kind: 'other'; part: Part }
 
+const SOLO: ReadonlySet<ToolKind> = new Set(['exec', 'write', 'delegate'])
+
+interface ToolFace {
+  toolPhase?: 'composing' | 'running' | 'done'
+  toolOutput?: string
+}
+
+function toolItem(call: Part, res: Part | undefined, live: boolean): ToolGroupItem {
+  const face = call as Part & ToolFace
+  const status = res?.toolResult?.status
+  const phase = face.toolPhase ?? (live && !res ? 'running' : res ? 'done' : undefined)
+  return {
+    id: call.toolCall?.id || call.toolCall?.name || 'tool',
+    name: call.toolCall?.name ?? '工具',
+    headline: toolHeadline(call.toolCall?.name ?? '', call.toolCall?.arguments),
+    arguments: call.toolCall?.arguments,
+    output: face.toolOutput,
+    phase,
+    durationMs: call.toolCall?.durationMs,
+    status: status === 'ok' || status === 'error' ? status : undefined,
+    summary: res?.toolResult?.summary,
+    running: phase === 'composing' || phase === 'running',
+  }
+}
+
 /** 把时间线部件收成行：相邻同类工具合并，思考是否仍在进行由 live 与后续部件决定。 */
 export function timelineEntries(parts: Part[], live: boolean): TimelineEntry[] {
   const out: TimelineEntry[] = []
@@ -100,23 +139,21 @@ export function timelineEntries(parts: Part[], live: boolean): TimelineEntry[] {
     const p = parts[i]
     if (p.type === 'tool_call') {
       const kind = toolKind(p.toolCall?.name ?? '')
+      if (SOLO.has(kind)) {
+        const call = parts[i]
+        i++
+        let res: Part | undefined
+        if (parts[i]?.type === 'tool_result') { res = parts[i]; i++ }
+        out.push({ kind: 'toolblock', toolKind: kind, item: toolItem(call, res, live) })
+        continue
+      }
       const items: ToolGroupItem[] = []
       while (i < parts.length && parts[i].type === 'tool_call' && toolKind(parts[i].toolCall?.name ?? '') === kind) {
         const call = parts[i]
         i++
         let res: Part | undefined
-        if (parts[i]?.type === 'tool_result') {
-          res = parts[i]
-          i++
-        }
-        const status = res?.toolResult?.status
-        items.push({
-          name: call.toolCall?.name ?? '工具',
-          headline: toolHeadline(call.toolCall?.name ?? '', call.toolCall?.arguments),
-          status: status === 'ok' || status === 'error' ? status : undefined,
-          summary: res?.toolResult?.summary,
-          running: live && !res,
-        })
+        if (parts[i]?.type === 'tool_result') { res = parts[i]; i++ }
+        items.push(toolItem(call, res, live))
       }
       out.push({ kind: 'tools', toolKind: kind, items })
       continue
diff --git a/test/live.test.ts b/test/live.test.ts
index 283b805..6853bc9 100644
--- a/test/live.test.ts
+++ b/test/live.test.ts
@@ -2,8 +2,8 @@
 // 轮次穿插同构、过程区折叠谓词。
 import { describe, it, expect } from 'vitest'
 import {
-  applyTextDelta, applyThinkingDelta, applyToolCall, applyToolResult, applyArtifactCreated,
-  liveToMessage, showProcessInline, type LiveItem,
+  applyTextDelta, applyThinkingDelta, applyToolCall, applyToolCallDelta, applyToolResult, applyToolOutput, applyArtifactCreated,
+  liveToMessage, livePhaseLabel, showProcessInline, type LiveItem,
 } from '../src/live'
 import type { LiveState } from '../src/store'
 
@@ -63,12 +63,25 @@ describe('applyThinkingDelta / applyTextDelta', () => {
     items = applyToolCall(items, 'b', 'cb')
     items = applyToolResult(items, 'cb', 'ok', '结果')
     expect(items).toEqual([
-      { kind: 'tool', callId: 'ca', name: 'a' },
-      { kind: 'tool', callId: 'cb', name: 'b', status: 'ok', summary: '结果' },
+      { kind: 'tool', callId: 'ca', name: 'a', args: '', state: 'running', startedAt: 0, endedAt: 0, output: '' },
+      { kind: 'tool', callId: 'cb', name: 'b', args: '', state: 'done', startedAt: 0, endedAt: 0, output: '', status: 'ok', summary: '结果' },
     ])
-    // 无 callId 的事件回落到尾部配对。
     items = applyToolResult(items, undefined, 'ok')
-    expect(items[0]).toEqual({ kind: 'tool', callId: 'ca', name: 'a', status: 'ok' })
+    expect(items[0]).toMatchObject({ kind: 'tool', callId: 'ca', name: 'a', state: 'done', status: 'ok' })
+  })
+  it('walks a tool from composing to running to done, and marks the narration as process', () => {
+    let items: LiveItem[] = applyTextDelta([], 0, '我来生成文档。')
+    items = applyToolCallDelta(items, 0, '{"script":', 'c1', 'run_python', 1000)
+    items = applyToolCallDelta(items, 0, '"print(1)"}', undefined, undefined, 1100)
+    const composing = liveToMessage(live({ items }))
+    expect(composing.parts[0].process).toBe(true)
+    expect(composing.parts[1]).toMatchObject({ type: 'tool_call', toolPhase: 'composing', toolCall: { name: 'run_python', arguments: '{"script":"print(1)"}' } })
+    items = applyToolCall(items, 'run_python', 'c1', undefined, 2000)
+    items = applyToolOutput(items, 'c1', 'hello\n')
+    items = applyToolResult(items, 'c1', 'ok', 'exit=0', 3500)
+    const done = liveToMessage(live({ items }))
+    expect(done.parts[1]).toMatchObject({ toolPhase: 'done', toolOutput: 'hello\n', toolCall: { durationMs: 1500 } })
+    expect(done.parts[2]).toMatchObject({ type: 'tool_result', toolResult: { summary: 'exit=0' } })
   })
 })
 
@@ -78,7 +91,7 @@ describe('liveToMessage', () => {
     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: 'c1', name: 'update_todos' } },
+      { type: 'tool_call', process: true, toolCall: { id: 'c1', name: 'update_todos' }, toolPhase: 'done' },
       { type: 'tool_result', process: true, toolCall: { id: 'c1', name: 'update_todos' },
         toolResult: { callId: 'c1', status: 'ok', summary: '已更新' } },
       { type: 'thinking', text: '再想想', process: true },
@@ -137,6 +150,20 @@ describe('liveToMessage', () => {
   })
 })
 
+describe('livePhaseLabel', () => {
+  it('names the current activity in Chinese', () => {
+    let items: LiveItem[] = applyThinkingDelta([], '想', 0)
+    expect(livePhaseLabel(live({ items }), 0)).toBe('思考中')
+    items = applyToolCallDelta(items, 0, '{}', 'c', 'run_python', 0)
+    expect(livePhaseLabel(live({ items }), 0)).toBe('正在编写 run_python')
+    items = applyToolCall(items, 'run_python', 'c', undefined, 1000)
+    expect(livePhaseLabel(live({ items }), 4000)).toBe('正在运行 run_python · 3 秒')
+    items = applyToolResult(items, 'c', 'ok', 'done', 4000)
+    items = applyTextDelta(items, 1, '好了')
+    expect(livePhaseLabel(live({ items }), 4000)).toBe('回复中')
+  })
+})
+
 describe('showProcessInline', () => {
   it('stays expanded for the whole live run, including the responding phase', () => {
     expect(showProcessInline(live({ phase: 'thinking' }), true)).toBe(true)
diff --git a/test/messageparts.test.ts b/test/messageparts.test.ts
index 3098d0f..7fa652c 100644
--- a/test/messageparts.test.ts
+++ b/test/messageparts.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest'
-import { splitTimeline, humanSize, artifactIcon, artifactIdsIn, markMissingArtifacts, workedLabel } from '../src/messageparts'
+import { splitTimeline, humanSize, artifactIcon, artifactIdsIn, markMissingArtifacts, workedLabel, dedupeDeliverables, foldRunErrors, processSummary, humanError } from '../src/messageparts'
 import type { Part } from '../src/contracts'
 
 function p(partial: Partial<Part> & { type: Part['type'] }): Part {
@@ -32,6 +32,20 @@ describe('splitTimeline', () => {
     expect(split.final.map(x => x.text)).toEqual(['最终'])
   })
 
+  it('lifts the last narration when a finished run has no final text', () => {
+    const parts: Part[] = [
+      p({ type: 'text', text: '先写一版', process: true }),
+      p({ type: 'tool_call', process: true, toolCall: { id: 'c1', name: 'run_python' } }),
+      p({ type: 'text', text: '纪要已经整理好', process: true }),
+      p({ type: 'tool_call', process: true, toolCall: { id: 'c2', name: 'run_python' } }),
+    ]
+    const split = splitTimeline(parts, true)
+    expect(split.final.map(x => x.text)).toEqual(['纪要已经整理好'])
+    expect(split.final[0].process).toBeUndefined()
+    expect(split.timeline.map(x => x.type)).toEqual(['text', 'tool_call', 'tool_call'])
+    expect(splitTimeline(parts).final).toEqual([])
+  })
+
   it('puts a message with no process parts entirely in the final section', () => {
     const parts = [p({ type: 'text', text: 'hi' })]
     expect(splitTimeline(parts).timeline).toEqual([])
@@ -54,6 +68,32 @@ describe('artifact ids in reply text', () => {
   })
 })
 
+describe('deliverables, errors, and the process summary', () => {
+  it('keeps the latest card for a repeated file name', () => {
+    const parts: Part[] = [
+      p({ type: 'artifact_ref', artifact: { artifactId: 'a1', name: '精美版.docx' } }),
+      p({ type: 'artifact_ref', artifact: { artifactId: 'a2', name: '精美版.docx' } }),
+      p({ type: 'artifact_ref', artifact: { artifactId: 'b1', name: '纪要.md' } }),
+    ]
+    expect(dedupeDeliverables(parts)).toEqual([
+      { artifact: { artifactId: 'a2', name: '精美版.docx' }, updates: 1 },
+      { artifact: { artifactId: 'b1', name: '纪要.md' }, updates: 0 },
+    ])
+  })
+
+  it('folds a same-run error into the assistant message that has a body', () => {
+    const body = { id: 'm1', runId: 'r1', role: 'assistant', parts: [p({ type: 'text', text: '做到这里' })] }
+    const err = { id: 'm2', runId: 'r1', role: 'assistant', parts: [p({ type: 'error', error: { code: 'budget', message: 'max turns' } })] }
+    const folded = foldRunErrors([body, err])
+    expect(folded.map(m => m.id)).toEqual(['m1'])
+    expect(folded[0].parts.map(part => part.type)).toEqual(['text', 'error'])
+    expect(humanError('run.cancelled', '已取消').title).toBe('已取消')
+    expect(humanError('budget', 'max turns').title).toContain('已停止')
+    expect(processSummary(12, 3, '2026-10-01T00:00:00.000Z', '2026-10-01T00:03:13.000Z'))
+      .toBe('已工作 3 分 13 秒 · 12 次工具调用 · 3 个文件')
+  })
+})
+
 describe('workedLabel', () => {
   it('formats the run span and degrades without timestamps', () => {
     expect(workedLabel('2026-10-01T00:00:00.000Z', '2026-10-01T00:01:05.000Z')).toBe('已工作 1 分 5 秒')
diff --git a/test/toolkind.test.ts b/test/toolkind.test.ts
index c0d5911..52ce3bd 100644
--- a/test/toolkind.test.ts
+++ b/test/toolkind.test.ts
@@ -39,7 +39,7 @@ describe('timelineEntries', () => {
       p({ type: 'tool_call', process: true, toolCall: { id: 'c', name: 'run_python', arguments: '{"script":"print(1)"}' } }),
     ]
     const rows = timelineEntries(parts, true)
-    expect(rows.map(r => r.kind)).toEqual(['thinking', 'tools', 'text', 'tools'])
+    expect(rows.map(r => r.kind)).toEqual(['thinking', 'tools', 'text', 'toolblock'])
     const reads = rows[1]
     if (reads.kind !== 'tools') throw new Error('expected tool group')
     expect(reads.toolKind).toBe('read')
@@ -49,8 +49,9 @@ describe('timelineEntries', () => {
     if (thinking.kind !== 'thinking') throw new Error('expected thinking')
     expect(thinking.active).toBe(false)
     const exec = rows[3]
-    if (exec.kind !== 'tools') throw new Error('expected exec group')
-    expect(exec.items[0].running).toBe(true)
+    if (exec.kind !== 'toolblock') throw new Error('expected exec block')
+    expect(exec.item.running).toBe(true)
+    expect(exec.item.headline).toBe('print(1)')
   })
 
   it('marks the trailing thinking row active while the run is live', () => {