diff --git a/apps/api/tests/broker/vevent.test.ts b/apps/api/tests/broker/vevent.test.ts
index e94dec7..529bb44 100644
--- a/apps/api/tests/broker/vevent.test.ts
+++ b/apps/api/tests/broker/vevent.test.ts
@@ -464,3 +464,43 @@ describe('computeAlertInstantUtc', () => {
     expect(result.toISOString()).toBe('2026-11-01T14:00:00.000Z');
   });
 });
+
+// ─── Phase 11 Plan 05 WR-01: positive-duration TRIGGER classifies as custom ──
+
+describe('classifyValarms — WR-01: positive-duration trigger (fires after event)', () => {
+  // RFC 5545 allows TRIGGER:+PT15M — fires 15 min AFTER event start.
+  // Before the fix: Math.abs() discards the sign and classifies it as preset/offlist 15.
+  // After the fix: positive duration → {kind:'custom'} (preserve as-is).
+
+  it('WR-01: TRIGGER:+PT15M classifies as custom, NOT preset', () => {
+    // TRIGGER:+PT15M is a post-event alarm; must not be mis-read as a 15-min-before lead.
+    // This test MUST FAIL before the fix.
+    const ics = makeIcs(
+      'BEGIN:VALARM\r\nTRIGGER;RELATED=END:PT15M\r\nACTION:DISPLAY\r\nDESCRIPTION:Reminder\r\nEND:VALARM',
+    );
+    expect(classifyValarms(ics)).toEqual({ kind: 'custom' });
+  });
+
+  it('WR-01: TRIGGER:+PT30M classifies as custom, NOT offlist', () => {
+    // 30 min is in PRESET_MINUTES — without the sign check, Math.abs would give preset/30.
+    const ics = makeIcs(
+      'BEGIN:VALARM\r\nTRIGGER:PT30M\r\nACTION:DISPLAY\r\nDESCRIPTION:Reminder\r\nEND:VALARM',
+    );
+    expect(classifyValarms(ics)).toEqual({ kind: 'custom' });
+  });
+
+  it('WR-01: negative TRIGGER:-PT15M still classifies as preset (unchanged behavior)', () => {
+    // Regression guard: negative triggers must not be affected by the fix.
+    const ics = makeIcs(
+      'BEGIN:VALARM\r\nTRIGGER:-PT15M\r\nACTION:DISPLAY\r\nDESCRIPTION:Reminder\r\nEND:VALARM',
+    );
+    expect(classifyValarms(ics)).toEqual({ kind: 'preset', leadMinutes: 15 });
+  });
+
+  it('WR-01: negative off-list TRIGGER:-PT45M still classifies as offlist', () => {
+    const ics = makeIcs(
+      'BEGIN:VALARM\r\nTRIGGER:-PT45M\r\nACTION:DISPLAY\r\nDESCRIPTION:Reminder\r\nEND:VALARM',
+    );
+    expect(classifyValarms(ics)).toEqual({ kind: 'offlist', leadMinutes: 45 });
+  });
+});