diff --git a/src/message-agent-executor-paired.test.ts b/src/message-agent-executor-paired.test.ts
new file mode 100644
index 0000000..c7006e2
--- /dev/null
+++ b/src/message-agent-executor-paired.test.ts
@@ -0,0 +1,112 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+vi.mock('./db.js', () => ({
+  completePairedTurn: vi.fn(),
+  failPairedTurn: vi.fn(),
+  getLastHumanMessageSender: vi.fn(() => '216851709744513024'),
+  getLatestTurnNumber: vi.fn(() => 0),
+  getPairedTaskById: vi.fn(),
+  insertPairedTurnOutput: vi.fn(),
+  refreshPairedTaskExecutionLease: vi.fn(() => true),
+  releasePairedTaskExecutionLease: vi.fn(),
+}));
+
+vi.mock('./paired-execution-context.js', () => ({
+  completePairedExecutionContext: vi.fn(),
+}));
+
+vi.mock('./paired-turn-run-ownership.js', () => ({
+  resolvePairedTurnRunOwnership: vi.fn(() => ({ state: 'active' })),
+}));
+
+vi.mock('./message-runtime-follow-up.js', () => ({
+  enqueuePairedFollowUpAfterEvent: vi.fn(),
+}));
+
+import type { AgentOutput } from './agent-runner.js';
+import * as db from './db.js';
+import { createPairedExecutionLifecycle } from './message-agent-executor-paired.js';
+
+const log = {
+  info: vi.fn(),
+  warn: vi.fn(),
+};
+
+describe('createPairedExecutionLifecycle', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('does not emit a second public notification after arbiter ESCALATE', async () => {
+    const outputs: AgentOutput[] = [];
+
+    vi.mocked(db.getPairedTaskById).mockReturnValue({
+      id: 'paired-task-arbiter-escalated',
+      chat_jid: 'group@test',
+      group_folder: 'test-group',
+      owner_service_id: 'claude',
+      reviewer_service_id: 'codex-main',
+      title: null,
+      source_ref: 'HEAD',
+      plan_notes: null,
+      round_trip_count: 1,
+      review_requested_at: '2026-04-09T00:00:00.000Z',
+      status: 'completed',
+      arbiter_verdict: 'escalate',
+      arbiter_requested_at: '2026-04-09T00:00:00.000Z',
+      completion_reason: 'arbiter_escalated',
+      created_at: '2026-04-09T00:00:00.000Z',
+      updated_at: '2026-04-09T00:00:01.000Z',
+    });
+
+    const lifecycle = createPairedExecutionLifecycle({
+      pairedExecutionContext: {
+        task: {
+          id: 'paired-task-arbiter-escalated',
+          chat_jid: 'group@test',
+          group_folder: 'test-group',
+          owner_service_id: 'claude',
+          reviewer_service_id: 'codex-main',
+          title: null,
+          source_ref: 'HEAD',
+          plan_notes: null,
+          round_trip_count: 1,
+          review_requested_at: '2026-04-09T00:00:00.000Z',
+          status: 'in_arbitration',
+          arbiter_verdict: null,
+          arbiter_requested_at: '2026-04-09T00:00:00.000Z',
+          completion_reason: null,
+          created_at: '2026-04-09T00:00:00.000Z',
+          updated_at: '2026-04-09T00:00:00.000Z',
+        },
+        workspace: null,
+        envOverrides: {},
+      },
+      pairedTurnIdentity: {
+        turnId:
+          'paired-task-arbiter-escalated:2026-04-09T00:00:00.000Z:arbiter-turn',
+        taskId: 'paired-task-arbiter-escalated',
+        taskUpdatedAt: '2026-04-09T00:00:00.000Z',
+        intentKind: 'arbiter-turn',
+        role: 'arbiter',
+      },
+      completedRole: 'arbiter',
+      chatJid: 'group@test',
+      runId: 'run-arbiter-escalated',
+      enqueueMessageCheck: vi.fn(),
+      onOutput: async (output) => {
+        outputs.push(output);
+      },
+      log,
+    });
+
+    lifecycle.recordFinalOutputBeforeDelivery(
+      'ESCALATE\nuser decision required',
+    );
+    lifecycle.markStatus('succeeded');
+    lifecycle.markSawOutput(true);
+    await lifecycle.asyncFinalize();
+
+    expect(outputs).toEqual([]);
+  });
+});
diff --git a/src/message-agent-executor-paired.ts b/src/message-agent-executor-paired.ts
index eb76773..0eb9732 100644
--- a/src/message-agent-executor-paired.ts
+++ b/src/message-agent-executor-paired.ts
@@ -417,7 +417,6 @@ export function createPairedExecutionLifecycle(args: {
         const mention = sender ? `<@${sender}>` : '';
         const notifications: Record<string, string> = {
           escalated: `${mention} ⚠️ 자동 해결 불가 — 확인이 필요합니다.`,
-          arbiter_escalated: `${mention} ⚠️ 중재자 판단: 사람 개입이 필요합니다.`,
         };
         const message = notifications[finishedTask.completion_reason];
         if (message) {