diff --git a/ui/src/pages/Routes/RouteDetail.module.css b/ui/src/pages/Routes/RouteDetail.module.css
index 692ce6f8..df1a80dc 100644
--- a/ui/src/pages/Routes/RouteDetail.module.css
+++ b/ui/src/pages/Routes/RouteDetail.module.css
@@ -326,3 +326,113 @@
   color: var(--text-muted);
   font-size: 13px;
 }
+
+.tapActions {
+  display: flex;
+  gap: 4px;
+}
+
+/* Tap modal */
+.tapModalBody {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+}
+
+.tapFormRow {
+  display: flex;
+  gap: 12px;
+}
+
+.tapFormRow > * {
+  flex: 1;
+}
+
+.monoTextarea {
+  font-family: var(--font-mono);
+  font-size: 12px;
+}
+
+.typeSelector {
+  display: flex;
+  gap: 8px;
+}
+
+.typeOption {
+  padding: 4px 12px;
+  border-radius: 6px;
+  font-size: 11px;
+  cursor: pointer;
+  border: 1px solid var(--border-subtle);
+  background: var(--bg-surface);
+  color: var(--text-muted);
+}
+
+.typeOptionActive {
+  background: var(--accent-primary);
+  color: white;
+  border-color: var(--accent-primary);
+}
+
+.tapModalFooter {
+  display: flex;
+  justify-content: flex-end;
+  gap: 8px;
+  margin-top: 8px;
+  padding-top: 12px;
+  border-top: 1px solid var(--border-subtle);
+}
+
+/* Test expression */
+.testSection {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.testTabs {
+  display: flex;
+  gap: 4px;
+}
+
+.testTabBtn {
+  padding: 4px 12px;
+  border-radius: 6px;
+  font-size: 11px;
+  cursor: pointer;
+  border: 1px solid var(--border-subtle);
+  background: var(--bg-surface);
+  color: var(--text-muted);
+}
+
+.testTabBtnActive {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+  border-color: var(--text-muted);
+}
+
+.testBody {
+  margin-top: 4px;
+}
+
+.testResult {
+  padding: 8px 12px;
+  border-radius: 6px;
+  font-family: var(--font-mono);
+  font-size: 12px;
+  margin-top: 8px;
+  white-space: pre-wrap;
+  word-break: break-all;
+}
+
+.testSuccess {
+  background: var(--bg-success-subtle, #0f2a1a);
+  border: 1px solid var(--border-success, #166534);
+  color: var(--text-success, #4ade80);
+}
+
+.testError {
+  background: var(--bg-error-subtle, #2a0f0f);
+  border: 1px solid var(--border-error, #991b1b);
+  color: var(--text-error, #f87171);
+}
diff --git a/ui/src/pages/Routes/RouteDetail.tsx b/ui/src/pages/Routes/RouteDetail.tsx
index 1c581f4c..3f2c2080 100644
--- a/ui/src/pages/Routes/RouteDetail.tsx
+++ b/ui/src/pages/Routes/RouteDetail.tsx
@@ -14,6 +14,14 @@ import {
   MonoText,
   Sparkline,
   Toggle,
+  Button,
+  Modal,
+  FormField,
+  Input,
+  Select,
+  Textarea,
+  Collapsible,
+  ConfirmDialog,
 } from '@cameleer/design-system';
 import type { KpiItem, Column } from '@cameleer/design-system';
 import { useGlobalFilters } from '@cameleer/design-system';
@@ -21,7 +29,8 @@ import { useRouteCatalog } from '../../api/queries/catalog';
 import { useDiagramByRoute } from '../../api/queries/diagrams';
 import { useProcessorMetrics } from '../../api/queries/processor-metrics';
 import { useStatsTimeseries, useSearchExecutions, useExecutionStats } from '../../api/queries/executions';
-import { useApplicationConfig, useUpdateApplicationConfig } from '../../api/queries/commands';
+import { useApplicationConfig, useUpdateApplicationConfig, useTestExpression } from '../../api/queries/commands';
+import type { TapDefinition } from '../../api/queries/commands';
 import type { ExecutionSummary, AppCatalogEntry, RouteSummary } from '../../api/types';
 import { mapDiagramToRouteNodes, toFlowSegments } from '../../utils/diagram-mapping';
 import styles from './RouteDetail.module.css';
@@ -265,6 +274,24 @@ export default function RouteDetail() {
   const [recentSortField, setRecentSortField] = useState<string>('startTime');
   const [recentSortDir, setRecentSortDir] = useState<'asc' | 'desc'>('desc');
 
+  // ── Tap modal state ────────────────────────────────────────────────────────
+  const [tapModalOpen, setTapModalOpen] = useState(false);
+  const [editingTap, setEditingTap] = useState<TapDefinition | null>(null);
+  const [tapName, setTapName] = useState('');
+  const [tapProcessor, setTapProcessor] = useState('');
+  const [tapLanguage, setTapLanguage] = useState('simple');
+  const [tapTarget, setTapTarget] = useState<'INPUT' | 'OUTPUT' | 'BOTH'>('OUTPUT');
+  const [tapExpression, setTapExpression] = useState('');
+  const [tapType, setTapType] = useState<'BUSINESS_OBJECT' | 'CORRELATION' | 'EVENT' | 'CUSTOM'>('BUSINESS_OBJECT');
+  const [tapEnabled, setTapEnabled] = useState(true);
+  const [deletingTap, setDeletingTap] = useState<TapDefinition | null>(null);
+
+  // ── Test expression state ──────────────────────────────────────────────────
+  const [testTab, setTestTab] = useState('recent');
+  const [testPayload, setTestPayload] = useState('');
+  const [testResult, setTestResult] = useState<{ result?: string; error?: string } | null>(null);
+  const [testExchangeId, setTestExchangeId] = useState('');
+
   const handleRecentSortChange = useCallback((key: string, dir: 'asc' | 'desc') => {
     setRecentSortField(key);
     setRecentSortDir(dir);
@@ -299,6 +326,7 @@ export default function RouteDetail() {
   // ── Application config ──────────────────────────────────────────────────────
   const config = useApplicationConfig(appId);
   const updateConfig = useUpdateApplicationConfig();
+  const testExpressionMutation = useTestExpression();
 
   const isRecording = config.data?.routeRecording?.[routeId!] !== false;
 
@@ -455,6 +483,171 @@ export default function RouteDetail() {
     { label: 'Taps', value: 'taps', count: routeTaps.length },
   ];
 
+  // ── Tap helpers ──────────────────────────────────────────────────────────
+
+  const processorOptions = useMemo(() => {
+    if (!diagram?.nodes) return [];
+    return (diagram.nodes as Array<{ id?: string; label?: string }>)
+      .filter((n) => n.id)
+      .map((n) => ({ value: n.id!, label: n.label || n.id! }));
+  }, [diagram]);
+
+  function openTapModal(tap: TapDefinition | null) {
+    if (tap) {
+      setEditingTap(tap);
+      setTapName(tap.attributeName);
+      setTapProcessor(tap.processorId);
+      setTapLanguage(tap.language);
+      setTapTarget(tap.target);
+      setTapExpression(tap.expression);
+      setTapType(tap.attributeType);
+      setTapEnabled(tap.enabled);
+    } else {
+      setEditingTap(null);
+      setTapName('');
+      setTapProcessor(processorOptions[0]?.value ?? '');
+      setTapLanguage('simple');
+      setTapTarget('OUTPUT');
+      setTapExpression('');
+      setTapType('BUSINESS_OBJECT');
+      setTapEnabled(true);
+    }
+    setTestResult(null);
+    setTestPayload('');
+    setTestExchangeId('');
+    setTapModalOpen(true);
+  }
+
+  function saveTap() {
+    if (!config.data) return;
+    const tap: TapDefinition = {
+      tapId: editingTap?.tapId || crypto.randomUUID(),
+      processorId: tapProcessor,
+      target: tapTarget,
+      expression: tapExpression,
+      language: tapLanguage,
+      attributeName: tapName,
+      attributeType: tapType,
+      enabled: tapEnabled,
+      version: editingTap ? editingTap.version + 1 : 1,
+    };
+    const taps = editingTap
+      ? config.data.taps.map(t => t.tapId === editingTap.tapId ? tap : t)
+      : [...(config.data.taps || []), tap];
+    updateConfig.mutate({ ...config.data, taps });
+    setTapModalOpen(false);
+  }
+
+  function deleteTap(tap: TapDefinition) {
+    if (!config.data) return;
+    const taps = config.data.taps.filter(t => t.tapId !== tap.tapId);
+    updateConfig.mutate({ ...config.data, taps });
+    setDeletingTap(null);
+  }
+
+  function toggleTapEnabled(tap: TapDefinition) {
+    if (!config.data) return;
+    const taps = config.data.taps.map(t =>
+      t.tapId === tap.tapId ? { ...t, enabled: !t.enabled } : t,
+    );
+    updateConfig.mutate({ ...config.data, taps });
+  }
+
+  function runTestExpression() {
+    if (!appId) return;
+    const body = testTab === 'recent' ? testExchangeId : testPayload;
+    testExpressionMutation.mutate(
+      { application: appId, expression: tapExpression, language: tapLanguage, body, target: tapTarget },
+      { onSuccess: (data) => setTestResult(data), onError: (err) => setTestResult({ error: (err as Error).message }) },
+    );
+  }
+
+  const tapColumns: Column<TapDefinition & { id: string }>[] = useMemo(() => [
+    {
+      key: 'attributeName',
+      header: 'Attribute',
+      sortable: true,
+      render: (_, row) => <span>{row.attributeName}</span>,
+    },
+    {
+      key: 'processorId',
+      header: 'Processor',
+      sortable: true,
+      render: (_, row) => <MonoText size="xs">{row.processorId}</MonoText>,
+    },
+    {
+      key: 'expression',
+      header: 'Expression',
+      render: (_, row) => <MonoText size="xs">{row.expression}</MonoText>,
+    },
+    {
+      key: 'language',
+      header: 'Language',
+      render: (_, row) => <Badge label={row.language} color="auto" />,
+    },
+    {
+      key: 'target',
+      header: 'Target',
+      render: (_, row) => <Badge label={row.target} color="auto" />,
+    },
+    {
+      key: 'attributeType',
+      header: 'Type',
+      render: (_, row) => <Badge label={row.attributeType} color="auto" />,
+    },
+    {
+      key: 'enabled',
+      header: 'Enabled',
+      width: '80px',
+      render: (_, row) => (
+        <Toggle
+          checked={row.enabled}
+          onChange={() => toggleTapEnabled(row)}
+        />
+      ),
+    },
+    {
+      key: 'actions' as any,
+      header: '',
+      width: '100px',
+      render: (_, row) => (
+        <div className={styles.tapActions}>
+          <Button variant="ghost" size="sm" onClick={() => openTapModal(row)}>Edit</Button>
+          <Button variant="ghost" size="sm" onClick={() => setDeletingTap(row)}>Del</Button>
+        </div>
+      ),
+    },
+  ], [config.data, processorOptions]);
+
+  const languageOptions = [
+    { value: 'simple', label: 'Simple' },
+    { value: 'jsonpath', label: 'JSONPath' },
+    { value: 'xpath', label: 'XPath' },
+    { value: 'jq', label: 'jq' },
+    { value: 'groovy', label: 'Groovy' },
+  ];
+
+  const targetOptions = [
+    { value: 'INPUT', label: 'Input' },
+    { value: 'OUTPUT', label: 'Output' },
+    { value: 'BOTH', label: 'Both' },
+  ];
+
+  const typeChoices: Array<{ value: TapDefinition['attributeType']; label: string }> = [
+    { value: 'BUSINESS_OBJECT', label: 'Business Object' },
+    { value: 'CORRELATION', label: 'Correlation' },
+    { value: 'EVENT', label: 'Event' },
+    { value: 'CUSTOM', label: 'Custom' },
+  ];
+
+  const recentExchangeOptions = useMemo(() =>
+    exchangeRows.slice(0, 20).map(e => ({
+      value: e.executionId,
+      label: `${e.executionId.slice(0, 12)} — ${e.status}`,
+    })),
+    [exchangeRows],
+  );
+
   // ── Render ─────────────────────────────────────────────────────────────────
 
   return (
@@ -632,14 +825,168 @@ export default function RouteDetail() {
 
         {activeTab === 'taps' && (
           <div className={styles.tapsSection}>
-            <div className={styles.emptyState}>
-              {routeTaps.length === 0
-                ? 'No taps configured for this route. Add a tap to extract business attributes from exchange data.'
-                : `${routeTaps.length} taps configured (${activeTapCount} active)`}
+            <div className={styles.tapsHeader}>
+              <span className={styles.tapsTitle}>Data Extraction Taps</span>
+              <Button variant="primary" size="sm" onClick={() => openTapModal(null)}>+ Add Tap</Button>
             </div>
+            {routeTaps.length === 0 ? (
+              <div className={styles.emptyState}>
+                No taps configured for this route. Add a tap to extract business attributes from exchange data.
+              </div>
+            ) : (
+              <DataTable
+                columns={tapColumns}
+                data={routeTaps.map(t => ({ ...t, id: t.tapId }))}
+                flush
+              />
+            )}
           </div>
         )}
       </div>
+
+      {/* Tap Modal */}
+      <Modal open={tapModalOpen} onClose={() => setTapModalOpen(false)} title={editingTap ? 'Edit Tap' : 'Add Tap'} size="lg">
+        <div className={styles.tapModalBody}>
+          <FormField label="Attribute Name">
+            <Input value={tapName} onChange={(e) => setTapName(e.target.value)} placeholder="e.g. orderId" />
+          </FormField>
+
+          <FormField label="Processor">
+            <Select
+              options={processorOptions}
+              value={tapProcessor}
+              onChange={(e) => setTapProcessor(e.target.value)}
+            />
+          </FormField>
+
+          <div className={styles.tapFormRow}>
+            <FormField label="Language">
+              <Select
+                options={languageOptions}
+                value={tapLanguage}
+                onChange={(e) => setTapLanguage(e.target.value)}
+              />
+            </FormField>
+            <FormField label="Target">
+              <Select
+                options={targetOptions}
+                value={tapTarget}
+                onChange={(e) => setTapTarget(e.target.value as 'INPUT' | 'OUTPUT' | 'BOTH')}
+              />
+            </FormField>
+          </div>
+
+          <FormField label="Expression">
+            <Textarea
+              className={styles.monoTextarea}
+              value={tapExpression}
+              onChange={(e) => setTapExpression(e.target.value)}
+              placeholder="e.g. ${body.orderId}"
+              rows={3}
+            />
+          </FormField>
+
+          <FormField label="Type">
+            <div className={styles.typeSelector}>
+              {typeChoices.map(tc => (
+                <button
+                  key={tc.value}
+                  type="button"
+                  className={`${styles.typeOption} ${tapType === tc.value ? styles.typeOptionActive : ''}`}
+                  onClick={() => setTapType(tc.value)}
+                >
+                  {tc.label}
+                </button>
+              ))}
+            </div>
+          </FormField>
+
+          <div className={styles.tapFormRow}>
+            <FormField label="Enabled">
+              <Toggle checked={tapEnabled} onChange={() => setTapEnabled(!tapEnabled)} />
+            </FormField>
+          </div>
+
+          {/* Test Expression */}
+          <Collapsible title="Test Expression" defaultOpen>
+            <div className={styles.testSection}>
+              <div className={styles.testTabs}>
+                <button
+                  type="button"
+                  className={`${styles.testTabBtn} ${testTab === 'recent' ? styles.testTabBtnActive : ''}`}
+                  onClick={() => setTestTab('recent')}
+                >
+                  Recent Exchange
+                </button>
+                <button
+                  type="button"
+                  className={`${styles.testTabBtn} ${testTab === 'custom' ? styles.testTabBtnActive : ''}`}
+                  onClick={() => setTestTab('custom')}
+                >
+                  Custom Payload
+                </button>
+              </div>
+
+              {testTab === 'recent' && (
+                <div className={styles.testBody}>
+                  <Select
+                    options={recentExchangeOptions.length > 0 ? recentExchangeOptions : [{ value: '', label: 'No recent exchanges' }]}
+                    value={testExchangeId}
+                    onChange={(e) => setTestExchangeId(e.target.value)}
+                  />
+                </div>
+              )}
+
+              {testTab === 'custom' && (
+                <div className={styles.testBody}>
+                  <Textarea
+                    className={styles.monoTextarea}
+                    value={testPayload}
+                    onChange={(e) => setTestPayload(e.target.value)}
+                    placeholder='{"orderId": "12345", ...}'
+                    rows={4}
+                  />
+                </div>
+              )}
+
+              <div className={styles.testBody}>
+                <Button
+                  variant="secondary"
+                  size="sm"
+                  onClick={runTestExpression}
+                  loading={testExpressionMutation.isPending}
+                  disabled={!tapExpression}
+                >
+                  Test
+                </Button>
+              </div>
+
+              {testResult && (
+                <div className={`${styles.testResult} ${testResult.error ? styles.testError : styles.testSuccess}`}>
+                  {testResult.error ?? testResult.result ?? 'No result'}
+                </div>
+              )}
+            </div>
+          </Collapsible>
+
+          <div className={styles.tapModalFooter}>
+            <Button variant="secondary" onClick={() => setTapModalOpen(false)}>Cancel</Button>
+            <Button variant="primary" onClick={saveTap} disabled={!tapName || !tapProcessor || !tapExpression}>Save</Button>
+          </div>
+        </div>
+      </Modal>
+
+      {/* Delete Tap Confirm */}
+      <ConfirmDialog
+        open={!!deletingTap}
+        onClose={() => setDeletingTap(null)}
+        onConfirm={() => deletingTap && deleteTap(deletingTap)}
+        title="Delete Tap"
+        message={`This will remove the tap "${deletingTap?.attributeName ?? ''}" from the configuration.`}
+        confirmText={deletingTap?.attributeName ?? ''}
+        confirmLabel="Delete"
+        variant="danger"
+      />
     </div>
   );
 }