diff --git a/src/server.ts b/src/server.ts
index bbf8bdc..f7cd34b 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -565,6 +565,13 @@ export class WebhookServer {
 			Metrics.inc('onboarding_prompts_sent_total', 0);
 			Metrics.inc('onboarding_prompts_skipped_total', 0);
 			Metrics.inc('onboarding_assign_failures_total', 0);
+
+			// Precalentar métricas de reacciones por emoji
+			for (const emoji of ['robot', 'warn', 'check', 'other']) {
+				Metrics.inc('reactions_enqueued_total', 0, { emoji });
+				Metrics.inc('reactions_sent_total', 0, { emoji });
+				Metrics.inc('reactions_failed_total', 0, { emoji });
+			}
 		} catch {}
 
 		if (process.env.NODE_ENV !== 'test') {
diff --git a/tests/unit/server/webhook.reactions.e2e.test.ts b/tests/unit/server/webhook.reactions.e2e.test.ts
new file mode 100644
index 0000000..554de6e
--- /dev/null
+++ b/tests/unit/server/webhook.reactions.e2e.test.ts
@@ -0,0 +1,131 @@
+import { describe, it, expect, beforeAll, afterAll, beforeEach } from 'bun:test';
+import { Database } from 'bun:sqlite';
+import { initializeDatabase } from '../../../src/db';
+import { WebhookServer } from '../../../src/server';
+import { ResponseQueue } from '../../../src/services/response-queue';
+import { AllowedGroups } from '../../../src/services/allowed-groups';
+import { GroupSyncService } from '../../../src/services/group-sync';
+
+function makePayload(event: string, data: any) {
+  return {
+    event,
+    instance: 'test-instance',
+    data
+  };
+}
+
+async function postWebhook(payload: any) {
+  const req = new Request('http://localhost/webhook', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(payload)
+  });
+  return await WebhookServer.handleRequest(req);
+}
+
+describe('WebhookServer E2E - reacciones por comando', () => {
+  let memdb: Database;
+  const envBackup = { ...process.env };
+
+  beforeAll(() => {
+    memdb = new Database(':memory:');
+    initializeDatabase(memdb);
+    (WebhookServer as any).dbInstance = memdb;
+    (ResponseQueue as any).dbInstance = memdb;
+    (AllowedGroups as any).dbInstance = memdb;
+    (GroupSyncService as any).dbInstance = memdb;
+  });
+
+  afterAll(() => {
+    process.env = envBackup;
+    try { memdb.close(); } catch {}
+  });
+
+  beforeEach(() => {
+    process.env = {
+      ...envBackup,
+      NODE_ENV: 'test',
+      REACTIONS_ENABLED: 'true',
+      REACTIONS_SCOPE: 'groups',
+      GROUP_GATING_MODE: 'enforce',
+      CHATBOT_PHONE_NUMBER: '999'
+    };
+    memdb.exec(`
+      DELETE FROM response_queue;
+      DELETE FROM task_assignments;
+      DELETE FROM tasks;
+      DELETE FROM users;
+      DELETE FROM groups;
+      DELETE FROM allowed_groups;
+    `);
+    GroupSyncService.activeGroupsCache?.clear?.();
+  });
+
+  it('encola 🤖 en grupo allowed y activo tras /t n', async () => {
+    const groupId = 'g1@g.us';
+    // Sembrar grupo activo y allowed
+    memdb.exec(`
+      INSERT OR IGNORE INTO groups (id, community_id, name, active, archived, is_community, last_verified)
+      VALUES ('${groupId}', 'comm-1', 'G1', 1, 0, 0, strftime('%Y-%m-%d %H:%M:%f','now'))
+    `);
+    GroupSyncService.activeGroupsCache.set(groupId, 'G1');
+    AllowedGroups.setStatus(groupId, 'allowed');
+
+    const payload = makePayload('MESSAGES_UPSERT', {
+      key: { remoteJid: groupId, id: 'MSG-OK-1', fromMe: false, participant: '600111222@s.whatsapp.net' },
+      message: { conversation: '/t n prueba e2e' }
+    });
+
+    const res = await postWebhook(payload);
+    expect(res.status).toBe(200);
+
+    const row = memdb.prepare(`SELECT metadata FROM response_queue WHERE metadata LIKE '%"kind":"reaction"%' ORDER BY id DESC LIMIT 1`).get() as any;
+    expect(row).toBeTruthy();
+    const meta = JSON.parse(String(row.metadata));
+    expect(meta.kind).toBe('reaction');
+    expect(meta.emoji).toBe('🤖');
+    expect(meta.chatId).toBe(groupId);
+    expect(meta.messageId).toBe('MSG-OK-1');
+  });
+
+  it('no encola reacción en DM cuando REACTIONS_SCOPE=groups', async () => {
+    const dmJid = '600111222@s.whatsapp.net';
+
+    const payload = makePayload('MESSAGES_UPSERT', {
+      key: { remoteJid: dmJid, id: 'MSG-DM-1', fromMe: false },
+      message: { conversation: '/t n en DM no reacciona' }
+    });
+
+    const res = await postWebhook(payload);
+    expect(res.status).toBe(200);
+
+    const cnt = memdb.prepare(`SELECT COUNT(*) AS c FROM response_queue WHERE metadata LIKE '%"kind":"reaction"%'`).get() as any;
+    expect(Number(cnt.c)).toBe(0);
+  });
+
+  it('encola ⚠️ en grupo allowed y activo para comando inválido (/t x sin IDs)', async () => {
+    const groupId = 'g2@g.us';
+    memdb.exec(`
+      INSERT OR IGNORE INTO groups (id, community_id, name, active, archived, is_community, last_verified)
+      VALUES ('${groupId}', 'comm-1', 'G2', 1, 0, 0, strftime('%Y-%m-%d %H:%M:%f','now'))
+    `);
+    GroupSyncService.activeGroupsCache.set(groupId, 'G2');
+    AllowedGroups.setStatus(groupId, 'allowed');
+
+    const payload = makePayload('MESSAGES_UPSERT', {
+      key: { remoteJid: groupId, id: 'MSG-ERR-1', fromMe: false, participant: '600111222@s.whatsapp.net' },
+      message: { conversation: '/t x' }
+    });
+
+    const res = await postWebhook(payload);
+    expect(res.status).toBe(200);
+
+    const row = memdb.prepare(`SELECT metadata FROM response_queue WHERE metadata LIKE '%"kind":"reaction"%' ORDER BY id DESC LIMIT 1`).get() as any;
+    expect(row).toBeTruthy();
+    const meta = JSON.parse(String(row.metadata));
+    expect(meta.kind).toBe('reaction');
+    expect(meta.emoji).toBe('⚠️');
+    expect(meta.chatId).toBe(groupId);
+    expect(meta.messageId).toBe('MSG-ERR-1');
+  });
+});