feat: ExchangeDetail and AgentHealth pages

ExchangeDetail (/exchanges/:id): exchange header card with ID/route/
status/duration, ProcessorTimeline for the specific exchange, step-by-
step exchange inspector using Collapsible+CodeBlock for headers/body at
each processor step, and error details block for failed exchanges.

AgentHealth (/agents): 6-card system overview strip, 2-column grid of
agent cards (StatusDot, name, version, tps, uptime, last-seen, CPU/mem
usage, active routes), expandable per-agent LineCharts for throughput
and error rate trends. Both pages use AppShell + shared Sidebar layout.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/pages/AgentHealth/AgentHealth.module.css

@@ -0,0 +1,192 @@
+/* Scrollable content area */
+.content {
+  flex: 1;
+  overflow-y: auto;
+  padding: 20px 24px 40px;
+  min-width: 0;
+  background: var(--bg-body);
+}
+
+/* System overview strip */
+.overviewStrip {
+  display: grid;
+  grid-template-columns: repeat(6, 1fr);
+  gap: 10px;
+  margin-bottom: 16px;
+}
+
+.overviewCard {
+  background: var(--bg-surface);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-md);
+  box-shadow: var(--shadow-card);
+  padding: 12px 16px;
+  text-align: center;
+}
+
+.overviewLabel {
+  font-size: 10px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.6px;
+  color: var(--text-muted);
+  margin-bottom: 4px;
+}
+
+.overviewValue {
+  font-size: 22px;
+  font-weight: 700;
+  font-family: var(--font-mono);
+  color: var(--text-primary);
+  line-height: 1.2;
+}
+
+.valueLive { color: var(--success); }
+.valueStale { color: var(--warning); }
+.valueDead { color: var(--error); }
+
+/* Section header */
+.sectionHeaderRow {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 12px;
+}
+
+.sectionTitle {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text-primary);
+}
+
+.sectionMeta {
+  font-size: 11px;
+  color: var(--text-muted);
+  font-family: var(--font-mono);
+}
+
+/* Agent cards grid */
+.agentGrid {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 14px;
+}
+
+/* Agent card */
+.agentCard {
+  display: flex;
+  flex-direction: column;
+  gap: 0;
+  overflow: hidden;
+  padding: 0 !important;
+}
+
+/* Agent card header */
+.agentCardHeader {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 14px 16px 10px;
+  cursor: pointer;
+  transition: background 0.15s;
+}
+
+.agentCardHeader:hover {
+  background: var(--bg-hover);
+}
+
+.agentCardLeft {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+.agentCardName {
+  font-size: 14px;
+  font-weight: 700;
+  font-family: var(--font-mono);
+  color: var(--text-primary);
+}
+
+.agentCardService {
+  font-size: 11px;
+  color: var(--text-secondary);
+  font-family: var(--font-mono);
+}
+
+.agentCardRight {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+.expandIcon {
+  font-size: 10px;
+  color: var(--text-muted);
+}
+
+/* Agent metrics row */
+.agentMetrics {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0;
+  padding: 6px 12px 12px;
+  border-top: 1px solid var(--border-subtle);
+}
+
+.agentMetric {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  padding: 6px 12px;
+  min-width: 80px;
+}
+
+.metricLabel {
+  font-size: 9px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.6px;
+  color: var(--text-muted);
+  margin-bottom: 2px;
+}
+
+.metricValue {
+  color: var(--text-primary);
+}
+
+.metricValueWarn {
+  color: var(--warning);
+  font-family: var(--font-mono);
+  font-size: 12px;
+}
+
+.metricValueError {
+  color: var(--error);
+  font-family: var(--font-mono);
+  font-size: 12px;
+}
+
+/* Expanded charts area */
+.agentCharts {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 12px;
+  padding: 12px 16px;
+  background: var(--bg-raised);
+  border-top: 1px solid var(--border-subtle);
+}
+
+.agentChart {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+}
+
+.chartTitle {
+  font-size: 11px;
+  font-weight: 600;
+  color: var(--text-secondary);
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+}

src/pages/AgentHealth/AgentHealth.tsx

@@ -0,0 +1,262 @@
+import { useState } from 'react'
+import { useNavigate } from 'react-router-dom'
+import styles from './AgentHealth.module.css'
+
+// Layout
+import { AppShell } from '../../design-system/layout/AppShell/AppShell'
+import { Sidebar } from '../../design-system/layout/Sidebar/Sidebar'
+import { TopBar } from '../../design-system/layout/TopBar/TopBar'
+
+// Composites
+import { LineChart } from '../../design-system/composites/LineChart/LineChart'
+
+// Primitives
+import { StatusDot } from '../../design-system/primitives/StatusDot/StatusDot'
+import { MonoText } from '../../design-system/primitives/MonoText/MonoText'
+import { Badge } from '../../design-system/primitives/Badge/Badge'
+import { Card } from '../../design-system/primitives/Card/Card'
+
+// Mock data
+import { agents } from '../../mocks/agents'
+import { routes } from '../../mocks/routes'
+
+// ─── Sidebar data (shared) ────────────────────────────────────────────────────
+const APPS = [
+  { id: 'order-service', name: 'order-service', agentCount: 2, health: 'live' as const, execCount: 1433 },
+  { id: 'payment-svc', name: 'payment-svc', agentCount: 1, health: 'live' as const, execCount: 912 },
+  { id: 'shipment-tracker', name: 'shipment-tracker', agentCount: 2, health: 'live' as const, execCount: 471 },
+  { id: 'notification-hub', name: 'notification-hub', agentCount: 1, health: 'stale' as const, execCount: 128 },
+]
+
+const SIDEBAR_ROUTES = routes.slice(0, 3).map((r) => ({
+  id: r.id,
+  name: r.name,
+  execCount: r.execCount,
+}))
+
+// ─── Build trend data for each agent ─────────────────────────────────────────
+function buildAgentTrendSeries(agentId: string) {
+  const baseValues: Record<string, { throughput: number; errorRate: number }> = {
+    'prod-1': { throughput: 14.2, errorRate: 0.2 },
+    'prod-2': { throughput: 11.8, errorRate: 3.1 },
+    'prod-3': { throughput: 12.1, errorRate: 0.5 },
+    'prod-4': { throughput: 9.1, errorRate: 0.3 },
+  }
+  const base = baseValues[agentId] ?? { throughput: 10, errorRate: 1 }
+
+  const now = new Date('2026-03-18T09:15:00')
+  const points = 20
+  const intervalMs = (3 * 60 * 60 * 1000) / points // 3 hours
+
+  const throughputData = Array.from({ length: points }, (_, i) => ({
+    x: new Date(now.getTime() - (points - i) * intervalMs),
+    y: Math.max(0, base.throughput + (Math.random() - 0.5) * 4),
+  }))
+
+  const errorRateData = Array.from({ length: points }, (_, i) => ({
+    x: new Date(now.getTime() - (points - i) * intervalMs),
+    y: Math.max(0, base.errorRate + (Math.random() - 0.5) * 2),
+  }))
+
+  return { throughputData, errorRateData }
+}
+
+// ─── Summary stats ────────────────────────────────────────────────────────────
+const liveCount = agents.filter((a) => a.status === 'live').length
+const totalTps = agents.reduce((sum, a) => sum + parseFloat(a.tps), 0)
+const totalActiveRoutes = agents.reduce((sum, a) => sum + a.activeRoutes, 0)
+
+// ─── AgentHealth page ─────────────────────────────────────────────────────────
+export function AgentHealth() {
+  const navigate = useNavigate()
+  const [activeItem, setActiveItem] = useState('agents')
+  const [expandedAgent, setExpandedAgent] = useState<string | null>(null)
+
+  function handleItemClick(id: string) {
+    setActiveItem(id)
+    const route = routes.find((r) => r.id === id)
+    if (route) navigate(`/routes/${id}`)
+  }
+
+  function toggleAgent(id: string) {
+    setExpandedAgent((prev) => (prev === id ? null : id))
+  }
+
+  return (
+    <AppShell
+      sidebar={
+        <Sidebar
+          apps={APPS}
+          routes={SIDEBAR_ROUTES}
+          agents={agents}
+          activeItem={activeItem}
+          onItemClick={handleItemClick}
+        />
+      }
+    >
+      {/* Top bar */}
+      <TopBar
+        breadcrumb={[
+          { label: 'Dashboard', href: '/' },
+          { label: 'Agents' },
+        ]}
+        environment="PRODUCTION"
+        shift="Day (06:00-18:00)"
+        user={{ name: 'hendrik' }}
+      />
+
+      {/* Scrollable content */}
+      <div className={styles.content}>
+
+        {/* System overview strip */}
+        <div className={styles.overviewStrip}>
+          <div className={styles.overviewCard}>
+            <div className={styles.overviewLabel}>Total Agents</div>
+            <div className={styles.overviewValue}>{agents.length}</div>
+          </div>
+          <div className={styles.overviewCard}>
+            <div className={styles.overviewLabel}>Live</div>
+            <div className={`${styles.overviewValue} ${styles.valueLive}`}>{liveCount}</div>
+          </div>
+          <div className={styles.overviewCard}>
+            <div className={styles.overviewLabel}>Stale</div>
+            <div className={`${styles.overviewValue} ${agents.some(a => a.status === 'stale') ? styles.valueStale : ''}`}>
+              {agents.filter((a) => a.status === 'stale').length}
+            </div>
+          </div>
+          <div className={styles.overviewCard}>
+            <div className={styles.overviewLabel}>Dead</div>
+            <div className={`${styles.overviewValue} ${agents.some(a => a.status === 'dead') ? styles.valueDead : ''}`}>
+              {agents.filter((a) => a.status === 'dead').length}
+            </div>
+          </div>
+          <div className={styles.overviewCard}>
+            <div className={styles.overviewLabel}>Total TPS</div>
+            <div className={styles.overviewValue}>{totalTps.toFixed(1)}/s</div>
+          </div>
+          <div className={styles.overviewCard}>
+            <div className={styles.overviewLabel}>Active Routes</div>
+            <div className={styles.overviewValue}>{totalActiveRoutes}</div>
+          </div>
+        </div>
+
+        {/* Section header */}
+        <div className={styles.sectionHeaderRow}>
+          <span className={styles.sectionTitle}>Agent Details</span>
+          <span className={styles.sectionMeta}>{liveCount}/{agents.length} live · Click to expand charts</span>
+        </div>
+
+        {/* Agent cards grid */}
+        <div className={styles.agentGrid}>
+          {agents.map((agent) => {
+            const isExpanded = expandedAgent === agent.id
+            const trendData = isExpanded ? buildAgentTrendSeries(agent.id) : null
+            const statusVariant = agent.status === 'live' ? 'live' : agent.status === 'stale' ? 'stale' : 'dead'
+            const cardAccent = agent.status === 'live' ? 'success' : agent.status === 'stale' ? 'warning' : 'error'
+
+            return (
+              <Card
+                key={agent.id}
+                accent={cardAccent as 'success' | 'warning' | 'error'}
+                className={styles.agentCard}
+              >
+                {/* Agent card header */}
+                <div
+                  className={styles.agentCardHeader}
+                  onClick={() => toggleAgent(agent.id)}
+                  role="button"
+                  tabIndex={0}
+                  onKeyDown={(e) => {
+                    if (e.key === 'Enter' || e.key === ' ') toggleAgent(agent.id)
+                  }}
+                  aria-expanded={isExpanded}
+                >
+                  <div className={styles.agentCardLeft}>
+                    <StatusDot variant={statusVariant} />
+                    <div>
+                      <div className={styles.agentCardName}>{agent.name}</div>
+                      <div className={styles.agentCardService}>{agent.service} {agent.version}</div>
+                    </div>
+                  </div>
+                  <div className={styles.agentCardRight}>
+                    <Badge
+                      label={agent.status.toUpperCase()}
+                      color={agent.status === 'live' ? 'success' : agent.status === 'stale' ? 'warning' : 'error'}
+                      variant="filled"
+                    />
+                    <span className={styles.expandIcon}>{isExpanded ? '▲' : '▼'}</span>
+                  </div>
+                </div>
+
+                {/* Agent metrics row */}
+                <div className={styles.agentMetrics}>
+                  <div className={styles.agentMetric}>
+                    <span className={styles.metricLabel}>TPS</span>
+                    <MonoText size="sm" className={styles.metricValue}>{agent.tps}</MonoText>
+                  </div>
+                  <div className={styles.agentMetric}>
+                    <span className={styles.metricLabel}>Uptime</span>
+                    <MonoText size="sm" className={styles.metricValue}>{agent.uptime}</MonoText>
+                  </div>
+                  <div className={styles.agentMetric}>
+                    <span className={styles.metricLabel}>Last Seen</span>
+                    <MonoText size="sm" className={styles.metricValue}>{agent.lastSeen}</MonoText>
+                  </div>
+                  {agent.errorRate && (
+                    <div className={styles.agentMetric}>
+                      <span className={styles.metricLabel}>Error Rate</span>
+                      <MonoText size="sm" className={styles.metricValueError}>{agent.errorRate}</MonoText>
+                    </div>
+                  )}
+                  <div className={styles.agentMetric}>
+                    <span className={styles.metricLabel}>CPU</span>
+                    <MonoText size="sm" className={agent.cpuUsagePct > 70 ? styles.metricValueWarn : styles.metricValue}>
+                      {agent.cpuUsagePct}%
+                    </MonoText>
+                  </div>
+                  <div className={styles.agentMetric}>
+                    <span className={styles.metricLabel}>Memory</span>
+                    <MonoText size="sm" className={agent.memoryUsagePct > 80 ? styles.metricValueError : agent.memoryUsagePct > 70 ? styles.metricValueWarn : styles.metricValue}>
+                      {agent.memoryUsagePct}%
+                    </MonoText>
+                  </div>
+                  <div className={styles.agentMetric}>
+                    <span className={styles.metricLabel}>Routes</span>
+                    <MonoText size="sm" className={styles.metricValue}>
+                      {agent.activeRoutes}/{agent.totalRoutes}
+                    </MonoText>
+                  </div>
+                </div>
+
+                {/* Expanded detail: trend charts */}
+                {isExpanded && trendData && (
+                  <div className={styles.agentCharts}>
+                    <div className={styles.agentChart}>
+                      <div className={styles.chartTitle}>Throughput (msg/s)</div>
+                      <LineChart
+                        series={[{ label: 'tps', data: trendData.throughputData }]}
+                        height={140}
+                        width={380}
+                        yLabel="msg/s"
+                      />
+                    </div>
+                    <div className={styles.agentChart}>
+                      <div className={styles.chartTitle}>Error Rate (err/h)</div>
+                      <LineChart
+                        series={[{ label: 'errors', data: trendData.errorRateData, color: 'var(--error)' }]}
+                        height={140}
+                        width={380}
+                        yLabel="err/h"
+                      />
+                    </div>
+                  </div>
+                )}
+              </Card>
+            )
+          })}
+        </div>
+
+      </div>
+    </AppShell>
+  )
+}

src/pages/ExchangeDetail/ExchangeDetail.module.css

@@ -0,0 +1,264 @@
+/* Scrollable content area */
+.content {
+  flex: 1;
+  overflow-y: auto;
+  padding: 20px 24px 40px;
+  min-width: 0;
+  background: var(--bg-body);
+}
+
+/* Exchange header card */
+.exchangeHeader {
+  background: var(--bg-surface);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
+  padding: 16px 20px;
+  margin-bottom: 14px;
+}
+
+.headerRow {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 16px;
+}
+
+.headerLeft {
+  display: flex;
+  align-items: flex-start;
+  gap: 12px;
+  flex: 1;
+}
+
+.exchangeId {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  margin-bottom: 6px;
+}
+
+.exchangeRoute {
+  font-size: 12px;
+  color: var(--text-secondary);
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  flex-wrap: wrap;
+}
+
+.routeLink {
+  color: var(--amber);
+  cursor: pointer;
+  text-decoration: underline;
+  text-underline-offset: 2px;
+}
+
+.routeLink:hover {
+  color: var(--amber-deep);
+}
+
+.headerDivider {
+  color: var(--text-faint);
+}
+
+.headerRight {
+  display: flex;
+  gap: 20px;
+  flex-shrink: 0;
+}
+
+.headerStat {
+  text-align: center;
+}
+
+.headerStatLabel {
+  font-size: 10px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.6px;
+  color: var(--text-muted);
+  margin-bottom: 2px;
+}
+
+.headerStatValue {
+  font-size: 14px;
+  font-weight: 600;
+  font-family: var(--font-mono);
+  color: var(--text-primary);
+}
+
+/* Section layout */
+.section {
+  background: var(--bg-surface);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
+  overflow: hidden;
+  margin-bottom: 16px;
+}
+
+.sectionHeader {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 12px 16px;
+  border-bottom: 1px solid var(--border-subtle);
+}
+
+.sectionTitle {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text-primary);
+}
+
+.sectionMeta {
+  font-size: 11px;
+  color: var(--text-muted);
+  font-family: var(--font-mono);
+}
+
+/* Timeline wrapper */
+.timelineWrap {
+  padding: 12px 16px;
+}
+
+/* Inspector steps */
+.inspectorSteps {
+  display: flex;
+  flex-direction: column;
+}
+
+.stepCollapsible {
+  border-bottom: 1px solid var(--border-subtle);
+}
+
+.stepCollapsible:last-child {
+  border-bottom: none;
+}
+
+.stepTitle {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+.stepIndex {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 22px;
+  height: 22px;
+  border-radius: 50%;
+  font-size: 11px;
+  font-weight: 700;
+  font-family: var(--font-mono);
+  flex-shrink: 0;
+}
+
+.stepOk {
+  background: var(--success-bg);
+  color: var(--success);
+  border: 1px solid var(--success-border);
+}
+
+.stepSlow {
+  background: var(--warning-bg);
+  color: var(--warning);
+  border: 1px solid var(--warning-border);
+}
+
+.stepFail {
+  background: var(--error-bg);
+  color: var(--error);
+  border: 1px solid var(--error-border);
+}
+
+.stepName {
+  font-size: 12px;
+  font-weight: 500;
+  font-family: var(--font-mono);
+  color: var(--text-primary);
+  flex: 1;
+}
+
+.stepDuration {
+  font-size: 11px;
+  font-family: var(--font-mono);
+  color: var(--text-muted);
+  margin-left: auto;
+  flex-shrink: 0;
+}
+
+/* Step body (two-column layout) */
+.stepBody {
+  display: grid;
+  grid-template-columns: 1fr 2fr;
+  gap: 12px;
+  padding: 12px 16px;
+  background: var(--bg-raised);
+}
+
+.stepPanel {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+}
+
+.stepPanelLabel {
+  font-size: 10px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.6px;
+  color: var(--text-muted);
+}
+
+.codeBlock {
+  flex: 1;
+  max-height: 200px;
+  overflow-y: auto;
+}
+
+/* Error section */
+.errorSection {
+  background: var(--error-bg);
+  border: 1px solid var(--error-border);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
+  overflow: hidden;
+  margin-bottom: 16px;
+}
+
+.errorBody {
+  padding: 16px;
+}
+
+.errorClass {
+  font-family: var(--font-mono);
+  font-size: 11px;
+  font-weight: 700;
+  color: var(--error);
+  margin-bottom: 8px;
+}
+
+.errorMessage {
+  font-family: var(--font-mono);
+  font-size: 11px;
+  color: var(--text-secondary);
+  background: var(--bg-surface);
+  border: 1px solid var(--error-border);
+  border-radius: var(--radius-sm);
+  padding: 10px 12px;
+  white-space: pre-wrap;
+  word-break: break-word;
+  line-height: 1.5;
+  margin-bottom: 8px;
+}
+
+.errorHint {
+  font-size: 11px;
+  color: var(--text-muted);
+  display: flex;
+  align-items: center;
+  gap: 5px;
+}

src/pages/ExchangeDetail/ExchangeDetail.tsx

@@ -0,0 +1,331 @@
+import { useMemo, useState } from 'react'
+import { useParams, useNavigate } from 'react-router-dom'
+import styles from './ExchangeDetail.module.css'
+
+// Layout
+import { AppShell } from '../../design-system/layout/AppShell/AppShell'
+import { Sidebar } from '../../design-system/layout/Sidebar/Sidebar'
+import { TopBar } from '../../design-system/layout/TopBar/TopBar'
+
+// Composites
+import { ProcessorTimeline } from '../../design-system/composites/ProcessorTimeline/ProcessorTimeline'
+import type { ProcessorStep } from '../../design-system/composites/ProcessorTimeline/ProcessorTimeline'
+
+// Primitives
+import { Badge } from '../../design-system/primitives/Badge/Badge'
+import { StatusDot } from '../../design-system/primitives/StatusDot/StatusDot'
+import { MonoText } from '../../design-system/primitives/MonoText/MonoText'
+import { Collapsible } from '../../design-system/primitives/Collapsible/Collapsible'
+import { CodeBlock } from '../../design-system/primitives/CodeBlock/CodeBlock'
+import { InfoCallout } from '../../design-system/primitives/InfoCallout/InfoCallout'
+
+// Mock data
+import { executions } from '../../mocks/executions'
+import { routes } from '../../mocks/routes'
+import { agents } from '../../mocks/agents'
+
+// ─── Sidebar data (shared) ────────────────────────────────────────────────────
+const APPS = [
+  { id: 'order-service', name: 'order-service', agentCount: 2, health: 'live' as const, execCount: 1433 },
+  { id: 'payment-svc', name: 'payment-svc', agentCount: 1, health: 'live' as const, execCount: 912 },
+  { id: 'shipment-tracker', name: 'shipment-tracker', agentCount: 2, health: 'live' as const, execCount: 471 },
+  { id: 'notification-hub', name: 'notification-hub', agentCount: 1, health: 'stale' as const, execCount: 128 },
+]
+
+const SIDEBAR_ROUTES = routes.slice(0, 3).map((r) => ({
+  id: r.id,
+  name: r.name,
+  execCount: r.execCount,
+}))
+
+// ─── Helpers ──────────────────────────────────────────────────────────────────
+function formatDuration(ms: number): string {
+  if (ms >= 60_000) return `${(ms / 1000).toFixed(0)}s`
+  if (ms >= 1000) return `${(ms / 1000).toFixed(2)}s`
+  return `${ms}ms`
+}
+
+function statusToVariant(status: 'completed' | 'failed' | 'running' | 'warning'): 'success' | 'error' | 'running' | 'warning' {
+  switch (status) {
+    case 'completed': return 'success'
+    case 'failed': return 'error'
+    case 'running': return 'running'
+    case 'warning': return 'warning'
+  }
+}
+
+function statusToLabel(status: 'completed' | 'failed' | 'running' | 'warning'): string {
+  switch (status) {
+    case 'completed': return 'COMPLETED'
+    case 'failed': return 'FAILED'
+    case 'running': return 'RUNNING'
+    case 'warning': return 'WARNING'
+  }
+}
+
+// ─── Exchange body mock generator ────────────────────────────────────────────
+// For each processor step, generate a plausible exchange body snapshot
+function generateExchangeSnapshot(
+  step: ProcessorStep,
+  orderId: string,
+  customer: string,
+  stepIndex: number,
+) {
+  const baseBody = {
+    orderId,
+    customer,
+    status: step.status === 'fail' ? 'ERROR' : 'PROCESSING',
+    processorStep: step.name,
+    stepIndex,
+  }
+
+  const headers: Record<string, string> = {
+    'CamelCorrelationId': `cmr-${Math.random().toString(36).slice(2, 10)}`,
+    'Content-Type': 'application/json',
+    'CamelTimerName': step.name,
+    'CamelBreadcrumbId': `${orderId}-${stepIndex}`,
+  }
+
+  if (stepIndex === 0) {
+    return {
+      headers,
+      body: JSON.stringify({
+        ...baseBody,
+        raw: { orderId, customer, items: ['ITEM-001', 'ITEM-002'], total: 142.50 },
+      }, null, 2),
+    }
+  }
+
+  if (step.type === 'enrich') {
+    return {
+      headers: {
+        ...headers,
+        'enrichedBy': step.name.replace('enrich(', '').replace(')', ''),
+      },
+      body: JSON.stringify({
+        ...baseBody,
+        enrichment: { source: step.name, addedFields: ['customerId', 'address', 'tier'] },
+      }, null, 2),
+    }
+  }
+
+  return {
+    headers,
+    body: JSON.stringify(baseBody, null, 2),
+  }
+}
+
+// ─── ExchangeDetail component ─────────────────────────────────────────────────
+export function ExchangeDetail() {
+  const { id } = useParams<{ id: string }>()
+  const navigate = useNavigate()
+  const [activeItem, setActiveItem] = useState('')
+
+  const execution = useMemo(() => executions.find((e) => e.id === id), [id])
+
+  function handleItemClick(itemId: string) {
+    setActiveItem(itemId)
+    const route = routes.find((r) => r.id === itemId)
+    if (route) navigate(`/routes/${itemId}`)
+  }
+
+  // Not found state
+  if (!execution) {
+    return (
+      <AppShell
+        sidebar={
+          <Sidebar
+            apps={APPS}
+            routes={SIDEBAR_ROUTES}
+            agents={agents}
+            activeItem={activeItem}
+            onItemClick={handleItemClick}
+          />
+        }
+      >
+        <TopBar
+          breadcrumb={[
+            { label: 'Dashboard', href: '/' },
+            { label: 'Exchanges' },
+            { label: id ?? 'Unknown' },
+          ]}
+          environment="PRODUCTION"
+          shift="Day (06:00-18:00)"
+          user={{ name: 'hendrik' }}
+        />
+        <div className={styles.content}>
+          <InfoCallout variant="warning">Exchange "{id}" not found in mock data.</InfoCallout>
+        </div>
+      </AppShell>
+    )
+  }
+
+  const statusVariant = statusToVariant(execution.status)
+  const statusLabel = statusToLabel(execution.status)
+
+  return (
+    <AppShell
+      sidebar={
+        <Sidebar
+          apps={APPS}
+          routes={SIDEBAR_ROUTES}
+          agents={agents}
+          activeItem={activeItem}
+          onItemClick={handleItemClick}
+        />
+      }
+    >
+      {/* Top bar */}
+      <TopBar
+        breadcrumb={[
+          { label: 'Dashboard', href: '/' },
+          { label: execution.route, href: `/routes/${execution.route}` },
+          { label: execution.id },
+        ]}
+        environment="PRODUCTION"
+        shift="Day (06:00-18:00)"
+        user={{ name: 'hendrik' }}
+      />
+
+      {/* Scrollable content */}
+      <div className={styles.content}>
+
+        {/* Exchange header */}
+        <div className={styles.exchangeHeader}>
+          <div className={styles.headerRow}>
+            <div className={styles.headerLeft}>
+              <StatusDot variant={statusVariant} />
+              <div>
+                <div className={styles.exchangeId}>
+                  <MonoText size="md">{execution.id}</MonoText>
+                  <Badge label={statusLabel} color={statusVariant} variant="filled" />
+                </div>
+                <div className={styles.exchangeRoute}>
+                  Route: <span className={styles.routeLink} onClick={() => navigate(`/routes/${execution.route}`)}>{execution.route}</span>
+                  <span className={styles.headerDivider}>·</span>
+                  Order: <MonoText size="xs">{execution.orderId}</MonoText>
+                  <span className={styles.headerDivider}>·</span>
+                  Customer: <MonoText size="xs">{execution.customer}</MonoText>
+                </div>
+              </div>
+            </div>
+            <div className={styles.headerRight}>
+              <div className={styles.headerStat}>
+                <div className={styles.headerStatLabel}>Duration</div>
+                <div className={styles.headerStatValue}>{formatDuration(execution.durationMs)}</div>
+              </div>
+              <div className={styles.headerStat}>
+                <div className={styles.headerStatLabel}>Agent</div>
+                <div className={styles.headerStatValue}>{execution.agent}</div>
+              </div>
+              <div className={styles.headerStat}>
+                <div className={styles.headerStatLabel}>Started</div>
+                <div className={styles.headerStatValue}>
+                  {execution.timestamp.toLocaleTimeString('en-GB', { hour: '2-digit', minute: '2-digit', second: '2-digit' })}
+                </div>
+              </div>
+              <div className={styles.headerStat}>
+                <div className={styles.headerStatLabel}>Processors</div>
+                <div className={styles.headerStatValue}>{execution.processors.length}</div>
+              </div>
+            </div>
+          </div>
+        </div>
+
+        {/* Processor timeline */}
+        <div className={styles.section}>
+          <div className={styles.sectionHeader}>
+            <span className={styles.sectionTitle}>Processor Timeline</span>
+            <span className={styles.sectionMeta}>Total: {formatDuration(execution.durationMs)}</span>
+          </div>
+          <div className={styles.timelineWrap}>
+            <ProcessorTimeline
+              processors={execution.processors}
+              totalMs={execution.durationMs}
+            />
+          </div>
+        </div>
+
+        {/* Step-by-step inspector */}
+        <div className={styles.section}>
+          <div className={styles.sectionHeader}>
+            <span className={styles.sectionTitle}>Exchange Inspector</span>
+            <span className={styles.sectionMeta}>{execution.processors.length} processor steps</span>
+          </div>
+          <div className={styles.inspectorSteps}>
+            {execution.processors.map((proc, index) => {
+              const snapshot = generateExchangeSnapshot(proc, execution.orderId, execution.customer, index)
+              const stepStatusClass =
+                proc.status === 'fail'
+                  ? styles.stepFail
+                  : proc.status === 'slow'
+                    ? styles.stepSlow
+                    : styles.stepOk
+
+              return (
+                <Collapsible
+                  key={index}
+                  title={
+                    <div className={styles.stepTitle}>
+                      <span className={`${styles.stepIndex} ${stepStatusClass}`}>{index + 1}</span>
+                      <span className={styles.stepName}>{proc.name}</span>
+                      <Badge
+                        label={proc.status.toUpperCase()}
+                        color={proc.status === 'fail' ? 'error' : proc.status === 'slow' ? 'warning' : 'success'}
+                        variant="outlined"
+                      />
+                      <span className={styles.stepDuration}>{formatDuration(proc.durationMs)}</span>
+                    </div>
+                  }
+                  defaultOpen={proc.status === 'fail'}
+                  className={styles.stepCollapsible}
+                >
+                  <div className={styles.stepBody}>
+                    <div className={styles.stepPanel}>
+                      <div className={styles.stepPanelLabel}>Exchange Headers</div>
+                      <CodeBlock
+                        content={JSON.stringify(snapshot.headers, null, 2)}
+                        language="json"
+                        copyable
+                        className={styles.codeBlock}
+                      />
+                    </div>
+                    <div className={styles.stepPanel}>
+                      <div className={styles.stepPanelLabel}>Exchange Body</div>
+                      <CodeBlock
+                        content={snapshot.body}
+                        language="json"
+                        copyable
+                        className={styles.codeBlock}
+                      />
+                    </div>
+                  </div>
+                </Collapsible>
+              )
+            })}
+          </div>
+        </div>
+
+        {/* Error block (if failed) */}
+        {execution.status === 'failed' && execution.errorMessage && (
+          <div className={styles.errorSection}>
+            <div className={styles.sectionHeader}>
+              <span className={styles.sectionTitle}>Error Details</span>
+              <Badge label="FAILED" color="error" />
+            </div>
+            <div className={styles.errorBody}>
+              <div className={styles.errorClass}>{execution.errorClass}</div>
+              <pre className={styles.errorMessage}>{execution.errorMessage}</pre>
+              <div className={styles.errorHint}>
+                Failed at processor: <MonoText size="xs">
+                  {execution.processors.find((p) => p.status === 'fail')?.name ?? 'unknown'}
+                </MonoText>
+              </div>
+            </div>
+          </div>
+        )}
+
+      </div>
+    </AppShell>
+  )
+}