diff --git a/src/services/command.ts b/src/services/command.ts
index 17910e5..332de9a 100644
--- a/src/services/command.ts
+++ b/src/services/command.ts
@@ -10,6 +10,7 @@ import { getQuickHelp, getFullHelp } from './messages/help';
 import { IdentityService } from './identity';
 import { AllowedGroups } from './allowed-groups';
 import { Metrics } from './metrics';
+import { ResponseQueue } from './response-queue';
 import { randomTokenBase64Url, sha256Hex } from '../utils/crypto';
 
 type CommandContext = {
@@ -1131,6 +1132,15 @@ export class CommandService {
 		);
 
 		// Registrar origen del comando para esta tarea (Fase 1)
+		// Registrar interacción del usuario (last_command_at)
+		try {
+			const ensured = ensureUserExists(context.sender, this.dbInstance);
+			if (ensured) {
+				try {
+					this.dbInstance.prepare(`UPDATE users SET last_command_at = strftime('%Y-%m-%d %H:%M:%f','now') WHERE id = ?`).run(ensured);
+				} catch {}
+			}
+		} catch {}
 		try {
 			if (groupIdToUse && isGroupId(groupIdToUse) && context.messageId) {
 				const participant = typeof context.participant === 'string' ? context.participant : null;
@@ -1234,6 +1244,121 @@ export class CommandService {
 			}
 		}
 
+		// Fase 2: disparar paquete de onboarding (2 DMs) tras crear tarea en grupo
+		try {
+			const isTest = String(process.env.NODE_ENV || '').toLowerCase() === 'test';
+			const enabledBase = ['true','1','yes','on'].includes(String(process.env.ONBOARDING_DM_ENABLED || '').toLowerCase());
+			const enabled = enabledBase && (!isTest || String(process.env.ONBOARDING_ENABLE_IN_TEST || '').toLowerCase() === 'true');
+			const gid = groupIdToUse || (isGroupId(context.groupId) ? context.groupId : null);
+
+			if (!enabled) {
+				try { Metrics.inc('onboarding_dm_skipped_total', 1, { reason: 'disabled', group_id: String(gid || '') }); } catch {}
+			} else if (!gid) {
+				try { Metrics.inc('onboarding_dm_skipped_total', 1, { reason: 'no_group', group_id: String(context.groupId || '') }); } catch {}
+			} else {
+				// Gating enforce
+				let allowed = true;
+				try {
+					const mode = String(process.env.GROUP_GATING_MODE || 'off').toLowerCase();
+					if (mode === 'enforce') {
+						try { (AllowedGroups as any).dbInstance = this.dbInstance; } catch {}
+						allowed = AllowedGroups.isAllowed(gid);
+					}
+				} catch {}
+				if (!allowed) {
+					try { Metrics.inc('onboarding_dm_skipped_total', 1, { reason: 'not_allowed', group_id: String(gid) }); } catch {}
+				} else {
+					const displayCode = createdTask?.display_code;
+					if (!(typeof displayCode === 'number' && Number.isFinite(displayCode))) {
+						try { Metrics.inc('onboarding_dm_skipped_total', 1, { reason: 'no_display_code', group_id: String(gid) }); } catch {}
+					} else {
+						// Candidatos
+						let members = GroupSyncService.listActiveMemberIds(gid);
+						const bot = String(process.env.CHATBOT_PHONE_NUMBER || '').trim();
+						const exclude = new Set<string>([createdBy, ...assignmentUserIds]);
+						members = members
+							.filter(id => /^\d+$/.test(id) && id.length < 14)
+							.filter(id => !exclude.has(id))
+							.filter(id => !bot || id !== bot);
+
+						if (members.length === 0) {
+							try { Metrics.inc('onboarding_dm_skipped_total', 1, { reason: 'no_members', group_id: String(gid) }); } catch {}
+						} else {
+							const capRaw = Number(process.env.ONBOARDING_EVENT_CAP);
+							const cap = Number.isFinite(capRaw) && capRaw > 0 ? Math.floor(capRaw) : 30;
+							let recipients = members;
+							if (recipients.length > cap) {
+								try { Metrics.inc('onboarding_recipients_capped_total', recipients.length - cap, { group_id: String(gid) }); } catch {}
+								recipients = recipients.slice(0, cap);
+							}
+
+							const cooldownRaw = Number(process.env.ONBOARDING_DM_COOLDOWN_DAYS);
+							const cooldownDays = Number.isFinite(cooldownRaw) && cooldownRaw >= 0 ? Math.floor(cooldownRaw) : 14;
+							const delay2 = 5000 + Math.floor(Math.random() * 5001); // 5–10s
+
+							const groupLabel = GroupSyncService.activeGroupsCache.get(gid) || gid;
+							const codeStr = String(displayCode);
+							const desc = (description || '(sin descripción)').trim();
+							const shortDesc = desc.length > 100 ? (desc.slice(0, 100) + '…') : desc;
+
+							const msg1 = `Hola, soy el bot de tareas. En ‘${groupLabel}’ acaban de crear una tarea: #${codeStr} ${shortDesc}
+Encárgate: /t tomar ${codeStr} · Más info: /t info
+Nota: nunca respondo en grupos; solo por privado.`;
+							const msg2 = `Guía rápida (este es un mensaje único):
+· Tus tareas: /t mias · Todas: /t todas
+· Recordatorios: /t configurar diario | l‑v | semanal | off
+· Web: /t web`;
+
+							for (const rcpt of recipients) {
+								const stats = ResponseQueue.getOnboardingStats(rcpt);
+								let variant: 'initial' | 'reminder' | null = null;
+
+								if (!stats || (stats.total || 0) === 0) {
+									variant = 'initial';
+								} else if (stats.firstInitialAt) {
+									let firstMs = NaN;
+									try {
+										const s = String(stats.firstInitialAt);
+										const iso = s.includes('T') ? s : (s.replace(' ', 'T') + 'Z');
+										firstMs = Date.parse(iso);
+									} catch {}
+									const nowMs = Date.now();
+									const okCooldown = Number.isFinite(firstMs) ? (nowMs - firstMs) >= cooldownDays * 24 * 60 * 60 * 1000 : false;
+
+									// Interacción del usuario desde el primer paquete
+									let hadInteraction = false;
+									try {
+										const row = this.dbInstance.prepare(`SELECT last_command_at FROM users WHERE id = ?`).get(rcpt) as any;
+										const lcRaw = row?.last_command_at ? String(row.last_command_at) : null;
+										if (lcRaw) {
+											const lcIso = lcRaw.includes('T') ? lcRaw : (lcRaw.replace(' ', 'T') + 'Z');
+											const lcMs = Date.parse(lcIso);
+											hadInteraction = Number.isFinite(lcMs) && Number.isFinite(firstMs) && lcMs > firstMs;
+										}
+									} catch {}
+
+									if (okCooldown && !hadInteraction) {
+										variant = 'reminder';
+									} else {
+										try { Metrics.inc('onboarding_dm_skipped_total', 1, { reason: hadInteraction ? 'had_interaction' : 'cooldown_active', group_id: String(gid) }); } catch {}
+									}
+								}
+
+								if (!variant) continue;
+
+								const bundleId = randomTokenBase64Url(12);
+								try {
+									ResponseQueue.enqueueOnboarding(rcpt, msg1, { variant, part: 1, bundle_id: bundleId, group_id: gid, task_id: taskId, display_code: displayCode }, 0);
+									ResponseQueue.enqueueOnboarding(rcpt, msg2, { variant, part: 2, bundle_id: bundleId, group_id: gid, task_id: taskId, display_code: displayCode }, delay2);
+									try { Metrics.inc('onboarding_bundle_sent_total', 1, { variant, group_id: String(gid) }); } catch {}
+								} catch {}
+							}
+						}
+					}
+				}
+			}
+		} catch {}
+
 		return responses;
 	}
 
diff --git a/src/services/group-sync.ts b/src/services/group-sync.ts
index bb5c9be..766f495 100644
--- a/src/services/group-sync.ts
+++ b/src/services/group-sync.ts
@@ -1279,4 +1279,29 @@ export class GroupSyncService {
 			return { added: 0, updated: 0, deactivated: 0 };
 		}
 	}
+
+	/**
+	 * Devuelve los IDs de usuario activos del grupo, filtrados a dígitos puros con longitud < 14.
+	 * No devuelve duplicados.
+	 */
+	public static listActiveMemberIds(groupId: string): string[] {
+		if (!groupId) return [];
+		try {
+			const rows = this.dbInstance.prepare(`
+				SELECT user_id
+				FROM group_members
+				WHERE group_id = ? AND is_active = 1
+			`).all(groupId) as Array<{ user_id: string }>;
+			const out = new Set<string>();
+			for (const r of rows) {
+				const uid = String(r.user_id || '').trim();
+				if (/^\d+$/.test(uid) && uid.length < 14) {
+					out.add(uid);
+				}
+			}
+			return Array.from(out);
+		} catch {
+			return [];
+		}
+	}
 }
diff --git a/src/services/response-queue.ts b/src/services/response-queue.ts
index 11442bf..1305a6a 100644
--- a/src/services/response-queue.ts
+++ b/src/services/response-queue.ts
@@ -107,6 +107,97 @@ export const ResponseQueue = {
 		}
 	},
 
+	// Encolar un DM de onboarding (part=1 inmediato, part=2 con retraso)
+	enqueueOnboarding(
+		recipient: string,
+		message: string,
+		metadata: {
+			variant: 'initial' | 'reminder';
+			part: 1 | 2;
+			bundle_id: string;
+			group_id?: string | null;
+			task_id?: number | null;
+			display_code?: number | null;
+		},
+		delayMs?: number
+	): void {
+		if (!recipient || !message) return;
+		const botNumber = (process.env.CHATBOT_PHONE_NUMBER || '').trim();
+		if (botNumber && recipient === botNumber) {
+			try { Metrics.inc('onboarding_dm_skipped_total', 1, { reason: 'bot_number', group_id: String(metadata.group_id || '') }); } catch {}
+			return;
+		}
+		const metaObj: any = {
+			kind: 'onboarding',
+			variant: metadata.variant,
+			part: metadata.part,
+			bundle_id: metadata.bundle_id,
+			group_id: metadata.group_id ?? null,
+			task_id: metadata.task_id ?? null,
+			display_code: metadata.display_code ?? null
+		};
+		const nextAt = delayMs && delayMs > 0 ? this.futureIso(delayMs) : this.nowIso();
+		this.dbInstance.prepare(`
+	       INSERT INTO response_queue (recipient, message, metadata, next_attempt_at)
+	       VALUES (?, ?, ?, ?)
+	     `).run(recipient, message, JSON.stringify(metaObj), nextAt);
+		try { Metrics.inc('onboarding_dm_sent_total', 1, { variant: metadata.variant, part: String(metadata.part), group_id: String(metadata.group_id || '') }); } catch {}
+	},
+
+	// Estadísticas de onboarding por destinatario (consulta simple sobre response_queue)
+	getOnboardingStats(recipient: string): { total: number; lastSentAt: string | null; firstInitialAt?: string | null; lastVariant?: 'initial' | 'reminder' | null } {
+		if (!recipient) return { total: 0, lastSentAt: null, firstInitialAt: undefined, lastVariant: null };
+		const rows = this.dbInstance.prepare(`
+	     SELECT status, created_at, updated_at, metadata
+	     FROM response_queue
+	     WHERE recipient = ? AND metadata IS NOT NULL
+	   `).all(recipient) as Array<{ status: string; created_at: string; updated_at: string; metadata: string | null }>;
+
+		let total = 0;
+		let lastSentAt: string | null = null;
+		let firstInitialAt: string | null | undefined = undefined;
+		let lastVariant: 'initial' | 'reminder' | null = null;
+		let lastTsMs = -1;
+
+		for (const r of rows) {
+			let meta: any = null;
+			try { meta = r.metadata ? JSON.parse(r.metadata) : null; } catch { meta = null; }
+			if (!meta || meta.kind !== 'onboarding') continue;
+			total++;
+
+			// Elegir timestamp de referencia
+			const tRaw = (r.updated_at || r.created_at || '').toString();
+			const iso = tRaw.includes('T') ? tRaw : (tRaw.replace(' ', 'T') + 'Z');
+			const ts = Date.parse(iso);
+			if (Number.isFinite(ts) && ts > lastTsMs) {
+				lastTsMs = ts;
+				lastSentAt = tRaw || null;
+				lastVariant = (meta.variant === 'reminder' ? 'reminder' : 'initial');
+			}
+
+			// Primer initial (preferimos part=1)
+			if (meta.variant === 'initial') {
+				const created = (r.created_at || '').toString();
+				if (!firstInitialAt) {
+					firstInitialAt = created || null;
+				} else {
+					// mantener el más antiguo
+					try {
+						const curIso = (firstInitialAt as string).includes('T') ? firstInitialAt as string : ((firstInitialAt as string).replace(' ', 'T') + 'Z');
+						const curMs = Date.parse(curIso);
+						const newIso = created.includes('T') ? created : (created.replace(' ', 'T') + 'Z');
+						const newMs = Date.parse(newIso);
+						if (Number.isFinite(newMs) && (!Number.isFinite(curMs) || newMs < curMs)) {
+							firstInitialAt = created || null;
+						}
+					} catch {}
+				}
+			}
+		}
+
+		return { total, lastSentAt, firstInitialAt, lastVariant };
+	},
+
 	// Encolar una reacción con idempotencia (24h) usando metadata canónica
 	async enqueueReaction(chatId: string, messageId: string, emoji: string, opts?: { participant?: string; fromMe?: boolean }): Promise<void> {
 		try {