diff --git a/app/api/phishing/campaigns/[id]/triage-note/route.ts b/app/api/phishing/campaigns/[id]/triage-note/route.ts
new file mode 100644
index 0000000..50ce398
--- /dev/null
+++ b/app/api/phishing/campaigns/[id]/triage-note/route.ts
@@ -0,0 +1,59 @@
+/**
+ * POST /api/phishing/campaigns/[id]/triage-note
+ *
+ * On-demand (re-)triggerable (D-03 — no dedupe/skip tracking) triage-note
+ * generation + post for a campaign. Structural twin of
+ * `app/api/phishing/campaigns/[id]/classify/route.ts` — enforces the same
+ * `phishing:analyze` permission tier (informational action, not a
+ * state-changing security decision like approve/remediate — CONTEXT.md
+ * Claude's Discretion), validates the campaign id as a UUID (V5), 404s an
+ * unknown campaign, then delegates to `generateAndPostTriageNote` and
+ * returns its result verbatim (D-06 — note text + per-ticket status list,
+ * never reshaped). No audit-event write here (CONTEXT.md: sent-note history
+ * is a deferred idea, out of scope for this phase).
+ */
+
+import { NextRequest, NextResponse } from 'next/server';
+import { requirePermission } from '@/lib/auth-utils';
+import postgresClient from '@/lib/services/postgres-client';
+import { generateAndPostTriageNote } from '@/lib/services/triage-note-service';
+
+const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const { error } = await requirePermission('phishing', 'analyze');
+  if (error) return error;
+
+  const { id } = await params;
+  // V5: validate UUID shape before querying — a malformed id would otherwise
+  // surface as an unhandled Postgres error -> uncaught 500.
+  if (!UUID_RE.test(id)) {
+    return NextResponse.json({ error: 'Invalid campaign id' }, { status: 400 });
+  }
+
+  try {
+    const campaignRes = await postgresClient.query<{ id: string }>(
+      `SELECT id FROM campaigns WHERE id = $1`,
+      [id]
+    );
+    if (!campaignRes.rows[0]) {
+      return NextResponse.json({ error: 'Campaign not found' }, { status: 404 });
+    }
+
+    // Outer catch below only fires for whole-request failures (e.g. DB
+    // unreachable) — per-ticket Autotask write failures are already captured
+    // inside the service and returned in this 200 body (D-05).
+    const result = await generateAndPostTriageNote(id);
+
+    return NextResponse.json(result);
+  } catch (err) {
+    console.error('[PHISHING-TRIAGE-NOTE] Failed to generate triage note', id, err);
+    return NextResponse.json(
+      { error: 'Failed to generate triage note', message: err instanceof Error ? err.message : 'Unknown error' },
+      { status: 500 }
+    );
+  }
+}