diff --git a/frontend/src/canvas/RunTimeline.tsx b/frontend/src/canvas/RunTimeline.tsx
index 776b8249..adfd77d8 100644
--- a/frontend/src/canvas/RunTimeline.tsx
+++ b/frontend/src/canvas/RunTimeline.tsx
@@ -7,7 +7,7 @@ import { formatClock, formatDuration, formatLapse, formatOffset, formatSpan, for
 import { statusMeta } from '../lib/status'
 import { topology, withSubSteps, type GraphLike } from '../run/derive'
 import {
-  isActivePhase, isTerminal, lastEventAt, liveAt, project, type NodeState, type NodeTrace, type Projection,
+  isActivePhase, isTerminal, lastEventAt, liveAt, project, stepLabel, type NodeState, type NodeTrace, type Projection,
   type Segment, type Trace,
 } from '../run/trace'
 import { projectCached } from '../run/useNodeView'
@@ -341,7 +341,9 @@ function buildRows(trace: Trace, graph: TimelineGraph, at: number, labels: Map<s
   const byId = new Map(graph.nodes.map((n) => [n.id, n]))
   // 子工作流里的步骤排在子工作流那一行下面（withSubSteps），老运行里改过图的照旧排在最后
   const ids = withSubSteps(topo.order, Object.keys(trace.nodes).filter((id) => !byId.has(id)))
-  const failedLabel = trace.failedNodeId ? labels.get(trace.failedNodeId) ?? trace.failedNodeId : ''
+  const own = (id: string) => labels.get(id)
+  // 子工作流里的那一步图上没有：接上子工作流的名字（stepLabel）
+  const failedLabel = trace.failedNodeId ? stepLabel(trace, trace.failedNodeId, own) : ''
   const rows: Row[] = []
   let top = 0
   for (const id of ids) {
@@ -350,7 +352,7 @@ function buildRows(trace: Trace, graph: TimelineGraph, at: number, labels: Map<s
     const p = states?.[id]
     const state: NodeState = states ? p?.state ?? 'idle' : n?.state ?? 'idle'
     const type = nodeTypeOf(byId.get(id))
-    const label = labels.get(id) ?? id
+    const label = stepLabel(trace, id, own)
     const tokens = states ? (p?.tokensIn ?? 0) + (p?.tokensOut ?? 0) : undefined
     rows.push({
       key: id, kind: 'node', nodeId: id, label, type,
@@ -780,7 +782,7 @@ export function RunTimeline({
           <button type="button" className="tl-alert" onClick={() => onFocusNode?.(trace.failedNodeId!)}
                   title="在画布上定位到失败的节点">
             <StatusBadge status="failed" size={11} animate={false} decorative />
-            <span className="min-w-0 truncate">失败于「{labels.get(trace.failedNodeId) ?? trace.failedNodeId}」</span>
+            <span className="min-w-0 truncate">失败于「{stepLabel(trace, trace.failedNodeId, (x) => labels.get(x))}」</span>
           </button>
         )}
         {trace.phase === 'waiting' && trace.waitingNodeId && (
diff --git a/frontend/src/pages/runs/RunDetailView.tsx b/frontend/src/pages/runs/RunDetailView.tsx
index 1b363bd1..18ee841e 100644
--- a/frontend/src/pages/runs/RunDetailView.tsx
+++ b/frontend/src/pages/runs/RunDetailView.tsx
@@ -13,7 +13,7 @@ import { catalogDrift, decodePhase, decodeRun, exitLabels, schemaDrift, summariz
 import { sourceHandles } from '../../canvas/nodeDefs'
 import { EffectsPane, RunTaskCards, useRunTasks } from './RunTasks'
 import { OriginChip } from './RunList'
-import { runStatusOf, type RunPhase } from '../../run/trace'
+import { runStatusOf, stepLabel, type RunPhase } from '../../run/trace'
 import { useCatalog } from '../../store/catalog'
 import type { Approval, Run, RunEvent } from '../../types'
 import { CatalogDriftBanner, FailedBanner, FeedbackStrip, HeldBanner, WaitingBanner, type Feedback } from './Banners'
@@ -161,9 +161,9 @@ export function RunDetailView({ runId, onChange, onDeleted }: {
 
   const labelOf = useCallback((id?: string | null) => {
     if (!id) return undefined
-    const n = d.graph?.nodes.find((x) => x.id === id)
-    return n?.data?.label || id
-  }, [d.graph])
+    // 子工作流里的那一步（出错、被驳回在它上面时运行记下的节点是「sub/x」）图上没有：接上子工作流的名字（stepLabel）
+    return stepLabel(d.trace, id, (x) => d.graph?.nodes.find((n) => n.id === x)?.data?.label || undefined)
+  }, [d.graph, d.trace])
 
   if (!run) {
     if (d.state === 'error') {
diff --git a/frontend/src/pages/runs/Telemetry.tsx b/frontend/src/pages/runs/Telemetry.tsx
index bbbd93f6..d39beade 100644
--- a/frontend/src/pages/runs/Telemetry.tsx
+++ b/frontend/src/pages/runs/Telemetry.tsx
@@ -7,7 +7,7 @@ import {
   NONE, formatClock, formatCost, formatDateTime, formatNumber, formatSpan, formatTime, formatTokens, shortId,
 } from '../../lib/format'
 import { type StatusCode } from '../../lib/status'
-import { isExecuting, liveAt, project, type Projection, type RunPhase, type Trace } from '../../run/trace'
+import { isExecuting, isSubStep, liveAt, project, type Projection, type RunPhase, type Trace } from '../../run/trace'
 import { useRunClock } from '../../run/useRunClock'
 import type { Approval, Run } from '../../types'
 import { BUNDLE_TEXT, COST_TEXT, REJECTED_TEXT, UNSAVED_HINT, isUnsaved, runCostText, runName } from '../../lib/terms'
@@ -96,7 +96,8 @@ export function Telemetry({ run, trace, phase, code, streaming, pending, labelOf
   const unpriced = (settled || !streaming ? (isNum(usage.unpriced_calls) ? usage.unpriced_calls : undefined) : undefined)
     ?? trace.unpricedCalls
 
-  const running = Object.values(trace.nodes).filter(isExecuting)
+  // 子工作流里的那一步算在子工作流那一步上（isSubStep），不和它一起算成两个同时在跑
+  const running = Object.values(trace.nodes).filter((n) => isExecuting(n) && !isSubStep(n.id))
   const waitingId = trace.waitingNodeId ?? pending?.[0]?.node_id
   const waitedMs = trace.waitingSince != null ? liveAt(trace, now) - trace.waitingSince
     : ageMs(pending?.[0]?.created_at, now)
diff --git a/frontend/src/run/RunHud.tsx b/frontend/src/run/RunHud.tsx
index b90bbc43..e0c7e454 100644
--- a/frontend/src/run/RunHud.tsx
+++ b/frontend/src/run/RunHud.tsx
@@ -14,7 +14,7 @@ import { structureSig, useStudio } from '../store/studio'
 import type { RunEvent } from '../types'
 import { topology } from './derive'
 import {
-  isActivePhase, isSettled, isTerminal, liveAt, project, type NodeState, type RunPhase, type Trace,
+  isActivePhase, isSettled, isTerminal, liveAt, project, stepLabel, type NodeState, type RunPhase, type Trace,
 } from './trace'
 import { useRunClock } from './useRunClock'
 
@@ -204,7 +204,8 @@ export function useRunGlance(active: boolean): RunGlance {
 
   const order = useMemo(() => topology({ nodes, edges }).order, [nodes, edges])
   const labels = useMemo(() => new Map(nodes.map((n) => [n.id, n.data.label || n.id])), [nodes])
-  const label = (id: string) => labels.get(id) ?? id
+  // 子工作流里的那一步（失败、被驳回在它上面）图上没有：接上子工作流的名字（stepLabel）
+  const label = (id: string) => stepLabel(trace, id, (x) => labels.get(x))
 
   const live = isActivePhase(phaseLive)
   const at = replayAt ?? (live ? liveAt(trace, now) : lastStampOf(trace))
diff --git a/frontend/src/run/trace.ts b/frontend/src/run/trace.ts
index 08315bb8..72ef85d0 100644
--- a/frontend/src/run/trace.ts
+++ b/frontend/src/run/trace.ts
@@ -91,6 +91,8 @@ export interface NodeTrace {
    */
   exited?: boolean
   exitTo?: string[]
+  /** node.started 上记的名字。子工作流里的步骤不在画布的图上，名字从这里取（stepLabel） */
+  label?: string
   /** 用量随时间的累计，回放时按游标取那一刻的 tokens 和工具数。没调过模型和工具的节点没有 */
   marks?: UsageMark[]
 }
@@ -277,6 +279,25 @@ function openIndex(segs: Segment[], kind: Segment['kind'], agent?: string): numb
   return -1
 }
 
+/**
+ * 子工作流里的一步（节点 id「子工作流节点 id/…」，docs/design/orchestration-round/00-总方案.md §2）：它在子工作流节点那一步
+ * 里面跑，节点计数、并行数、「当前在跑」都算在子工作流那一步上，不另算
+ */
+export const isSubStep = (id: string): boolean => id.includes('/')
+
+/**
+ * 一个节点给人看的名字：own 是画布的图上的名字（找不到为 undefined）。子工作流里的步骤（isSubStep）图上没有，接上子工作流
+ * 那一步的名字：「取数子流程 › 查订单」——和服务端终态事件的 label 同一个拼法（runner._label_of），失败横幅、泳道、
+ * 运行胶囊不再写裸的「sub/fetch」。别的找不到的照旧写 id
+ */
+export function stepLabel(t: Trace, id: string, own: (id: string) => string | undefined): string {
+  const mine = own(id)
+  if (mine) return mine
+  if (!isSubStep(id)) return id
+  const cut = id.lastIndexOf('/')
+  return `${stepLabel(t, id.slice(0, cut), own)} › ${t.nodes[id]?.label || id.slice(cut + 1)}`
+}
+
 /**
  * 此刻同时在跑的数量。
  *
@@ -286,8 +307,7 @@ function openIndex(segs: Segment[], kind: Segment['kind'], agent?: string): numb
 function parallelOf(nodes: Record<string, NodeTrace>): number {
   let total = 0
   for (const n of Object.values(nodes)) {
-    // 子工作流里的那几步（「子工作流节点 id/…」）在子工作流节点那一格里跑，不另算一路并行
-    if (n.id.includes('/')) continue
+    if (isSubStep(n.id)) continue
     let inner = 0
     let run = 0
     for (const s of n.segments) {
@@ -521,6 +541,7 @@ export function foldEvent(t: Trace, ev: RunEvent): Trace {
     case 'node.started': {
       if (!nodeId) break
       const n = node(nodeId)
+      if (typeof d.label === 'string' && d.label && n.label !== d.label) n.label = d.label
       const open = openIndex(n.segments, 'run')
       const lastSeg = n.segments[n.segments.length - 1]
       if (open >= 0) {
@@ -1012,7 +1033,8 @@ export function project(t: Trace, at: number): Projection {
         toolsRunning: state === 'running' ? m?.[5] ?? 0 : 0,
       }
     }
-    if (view.state === 'done' || view.state === 'skipped') nodesDone += 1
+    // 分母是工作流里的节点数：子工作流里的步骤算在子工作流那一步里（isSubStep），不另算完成数
+    if ((view.state === 'done' || view.state === 'skipped') && !isSubStep(n.id)) nodesDone += 1
     nodes[n.id] = view
   }
 
@@ -1039,7 +1061,7 @@ export function project(t: Trace, at: number): Projection {
 
   return {
     phase, elapsedMs, activeMs, waitMs, nodesDone,
-    nodesTotal: t.nodesTotal ?? Object.keys(t.nodes).length,
+    nodesTotal: t.nodesTotal ?? Object.keys(t.nodes).filter((id) => !isSubStep(id)).length,
     parallelNow, ...usage, nodes,
   }
 }
diff --git a/scripts/check-decode.mjs b/scripts/check-decode.mjs
index 43d202a9..fd390a94 100644
--- a/scripts/check-decode.mjs
+++ b/scripts/check-decode.mjs
@@ -3030,6 +3030,36 @@ await section('子工作流里的每一步进了同一个运行（节点 id「
   check('子工作流里的一步：「取数子流程 › 查订单」', title('sub/fetch') === '取数子流程 › 查订单', title('sub/fetch'))
   check('没起名字的（名字就是子图里的 id）退到节点类型', title('sub/o') === '取数子流程 › 成果', title('sub/o'))
   check('子工作流节点自己照旧', title('sub') === '取数子流程', title('sub'))
+
+  // 航迹的计数：子工作流里的步骤算在子工作流那一步里，完成数的分母是工作流里的节点数（run.started 的 nodes）
+  const trace = await import(await load('/src/run/trace.ts'))
+  const evs = [E(1, 'run.started', null, { nodes: 2 }), E(2, 'node.started', 'start', {}), E(3, 'node.finished', 'start', {}),
+    E(4, 'node.started', 'sub', { label: '取数子流程' }),
+    E(5, 'node.started', 'sub/fetch', { label: '查订单' }), E(6, 'node.finished', 'sub/fetch', {}),
+    E(7, 'node.started', 'sub/o', {})]
+  const t = evs.reduce(trace.foldEvent, trace.emptyTrace())
+  const mid = trace.project(t, 7500)
+  check('跑到子工作流里：完成数只数工作流里的节点（1/2，不是 2/2）', mid.nodesDone === 1 && mid.nodesTotal === 2,
+    `${mid.nodesDone}/${mid.nodesTotal}`)
+  check('……子工作流和它里面那一步不算成两路并行', mid.parallelNow === 1, String(mid.parallelNow))
+  check('……「当前在跑」只认子工作流那一步', Object.values(t.nodes).filter((n) => trace.isExecuting(n) && !trace.isSubStep(n.id))
+    .map((n) => n.id).join() === 'sub')
+  const done = [...evs, E(8, 'node.finished', 'sub/o', {}), E(9, 'node.finished', 'sub', {}),
+    E(10, 'run.finished', null, { output: {} })].reduce(trace.foldEvent, trace.emptyTrace())
+  const end = trace.project(done, 10000)
+  check('跑完：2/2，不是 4/2', end.nodesDone === 2 && end.nodesTotal === 2, `${end.nodesDone}/${end.nodesTotal}`)
+
+  // 子工作流里的一步出错：运行记下的出错节点是「sub/fetch」，图上没有它。失败横幅、泳道、运行胶囊照「子工作流 › 那一步」写
+  const failedRun = [...evs.slice(0, 5), E(6, 'node.failed', 'sub/fetch', { error: '查询失败' }),
+    E(7, 'node.failed', 'sub', { error: '查询失败' }),
+    E(8, 'run.failed', null, { error: '查询失败', node_id: 'sub/fetch', label: '取数子流程 › 查订单' })]
+    .reduce(trace.foldEvent, trace.emptyTrace())
+  const own = (id) => ({ start: '入口', sub: '取数子流程' })[id]
+  check('出错节点记的是子图里那一步', failedRun.failedNodeId === 'sub/fetch', failedRun.failedNodeId)
+  check('名字接上子工作流：「取数子流程 › 查订单」，不写裸 id', trace.stepLabel(failedRun, 'sub/fetch', own) === '取数子流程 › 查订单',
+    trace.stepLabel(failedRun, 'sub/fetch', own))
+  check('图上的节点照旧写图上的名字', trace.stepLabel(failedRun, 'sub', own) === '取数子流程')
+  check('没起过名字的子图步骤写子图里的 id', trace.stepLabel(t, 'sub/o', own) === '取数子流程 › o', trace.stepLabel(t, 'sub/o', own))
 })
 
 console.log(failed ? `\n✗ ${failed} 项未通过` : '\n✓ 解码器全部通过')