diff --git a/src/services/commands/handlers/nueva.ts b/src/services/commands/handlers/nueva.ts
new file mode 100644
index 0000000..e07bc9c
--- /dev/null
+++ b/src/services/commands/handlers/nueva.ts
@@ -0,0 +1,262 @@
+import type { Database } from 'bun:sqlite';
+import { ensureUserExists } from '../../../db';
+import { normalizeWhatsAppId, isGroupId } from '../../../utils/whatsapp';
+import { TaskService } from '../../../tasks/service';
+import { GroupSyncService } from '../../group-sync';
+import { ContactsService } from '../../contacts';
+import { IdentityService } from '../../identity';
+import { Metrics } from '../../metrics';
+import { ICONS } from '../../../utils/icons';
+import { codeId, formatDDMM } from '../../../utils/formatting';
+import { parseNueva } from '../parsers/nueva';
+import { buildJitAssigneePrompt, maybeEnqueueOnboardingBundle } from '../../onboarding';
+
+type Ctx = {
+  sender: string;
+  groupId: string;
+  message: string;
+  mentions: string[];
+  messageId?: string;
+  participant?: string;
+  fromMe?: boolean;
+};
+
+type Msg = {
+  recipient: string;
+  message: string;
+  mentions?: string[];
+};
+
+const CTA_HELP = 'ℹ️ Tus tareas: `/t mias` · Todas: `/t todas` · Info: `/t info` · Web: `/t web`';
+
+export async function handleNueva(context: Ctx, deps: { db: Database }): Promise<Msg[]> {
+  const tokens = (context.message || '').trim().split(/\s+/);
+
+  // Normalizar menciones del contexto para parseo y asignaciones (A2: fallback a números plausibles)
+  const MIN_FALLBACK_DIGITS = (() => {
+    const raw = (process.env.ONBOARDING_FALLBACK_MIN_DIGITS || '').trim();
+    const n = parseInt(raw || '8', 10);
+    return Number.isFinite(n) && n > 0 ? n : 8;
+  })();
+  const MAX_FALLBACK_DIGITS = (() => {
+    const raw = (process.env.ONBOARDING_FALLBACK_MAX_DIGITS || '').trim();
+    const n = parseInt(raw || '15', 10);
+    return Number.isFinite(n) && n > 0 ? n : 15;
+  })();
+
+  type FailReason = 'non_numeric' | 'too_short' | 'too_long' | 'from_lid' | 'invalid';
+  const isDigits = (s: string) => /^\d+$/.test(s);
+  const plausibility = (s: string, opts?: { fromLid?: boolean }): { ok: boolean; reason?: FailReason } => {
+    if (!s) return { ok: false, reason: 'invalid' };
+    if (opts?.fromLid) return { ok: false, reason: 'from_lid' };
+    if (!isDigits(s)) return { ok: false, reason: 'non_numeric' };
+    if (s.length < MIN_FALLBACK_DIGITS) return { ok: false, reason: 'too_short' };
+    if (s.length >= MAX_FALLBACK_DIGITS) return { ok: false, reason: 'too_long' };
+    return { ok: true };
+  };
+  const incOnboardingFailure = (source: 'mentions' | 'tokens', reason: FailReason) => {
+    try {
+      const gid = isGroupId(context.groupId) ? context.groupId : 'dm';
+      Metrics.inc('onboarding_assign_failures_total', 1, { group_id: String(gid), source, reason });
+    } catch { }
+  };
+
+  // 1) Menciones aportadas por el backend (JIDs crudos)
+  const unresolvedAssigneeDisplays: string[] = [];
+  const mentionsNormalizedFromContext = Array.from(new Set(
+    (context.mentions || []).map((j) => {
+      const norm = normalizeWhatsAppId(j);
+      if (!norm) {
+        // agregar a no resolubles para JIT (mostrar sin @ ni dominio)
+        const raw = String(j || '');
+        const disp = raw.split('@')[0].split(':')[0].replace(/^@+/, '').replace(/^\+/, '');
+        if (disp) unresolvedAssigneeDisplays.push(disp);
+        incOnboardingFailure('mentions', 'invalid');
+        return null;
+      }
+      const resolved = IdentityService.resolveAliasOrNull(norm);
+      if (resolved) return resolved;
+      // detectar si la mención proviene de un JID @lid (no plausible aunque sea numérico)
+      const dom = String(j || '').split('@')[1]?.toLowerCase() || '';
+      const fromLid = dom.includes('lid');
+      const p = plausibility(norm, { fromLid });
+      if (p.ok) return norm;
+      // conservar para copy JIT
+      unresolvedAssigneeDisplays.push(norm);
+      incOnboardingFailure('mentions', p.reason!);
+      return null;
+    }).filter((id): id is string => !!id)
+  ));
+
+  // 2) Tokens de texto que empiezan por '@' como posibles asignados
+  const atTokenCandidates = tokens.slice(2)
+    .filter(t => t.startsWith('@'))
+    .map(t => t.replace(/^@+/, '').replace(/^\+/, '').replace(/[.,;:!?)\]}¿¡"'’”]+$/, ''));
+  const normalizedFromAtTokens = Array.from(new Set(
+    atTokenCandidates.map((v) => {
+      // Token especial: '@yo' → autoasignación; no cuenta como fallo
+      if (String(v).toLowerCase() === 'yo') {
+        return null;
+      }
+      const norm = normalizeWhatsAppId(v);
+      if (!norm) {
+        // agregar a no resolubles para JIT (texto ya viene sin @/+)
+        if (v) unresolvedAssigneeDisplays.push(v);
+        incOnboardingFailure('tokens', 'invalid');
+        return null;
+      }
+      const resolved = IdentityService.resolveAliasOrNull(norm);
+      if (resolved) return resolved;
+      const p = plausibility(norm, { fromLid: false });
+      if (p.ok) return norm;
+      // conservar para copy JIT (preferimos el token limpio v)
+      unresolvedAssigneeDisplays.push(v);
+      incOnboardingFailure('tokens', p.reason!);
+      return null;
+    }).filter((id): id is string => !!id)
+  ));
+
+  // 3) Unir y deduplicar
+  const combinedAssigneeCandidates = Array.from(new Set([
+    ...mentionsNormalizedFromContext,
+    ...normalizedFromAtTokens
+  ]));
+
+  const { description, dueDate, selfAssign } = parseNueva((context.message || '').trim(), mentionsNormalizedFromContext);
+
+  // Asegurar creador
+  const createdBy = ensureUserExists(context.sender, deps.db);
+  if (!createdBy) {
+    throw new Error('No se pudo asegurar el usuario creador');
+  }
+
+  // Normalizar menciones y excluir duplicados y el número del bot
+  const botNumber = process.env.CHATBOT_PHONE_NUMBER || '';
+  const assigneesNormalized = Array.from(new Set(
+    [
+      ...(selfAssign ? [context.sender] : []),
+      ...combinedAssigneeCandidates
+    ].filter(id => !botNumber || id !== botNumber)
+  ));
+
+  // Asegurar usuarios asignados
+  const ensuredAssignees = assigneesNormalized
+    .map(id => ensureUserExists(id, deps.db))
+    .filter((id): id is string => !!id);
+
+  // Asignación por defecto según contexto:
+  // - En grupos: si no hay menciones → sin dueño (ningún asignado)
+  // - En DM: si no hay menciones → asignada al creador
+  let assignmentUserIds: string[] = [];
+  if (ensuredAssignees.length > 0) {
+    assignmentUserIds = ensuredAssignees;
+  } else {
+    assignmentUserIds = (context.groupId && isGroupId(context.groupId)) ? [] : [createdBy];
+  }
+
+  // Definir group_id solo si el grupo está activo
+  const groupIdToUse = (context.groupId && GroupSyncService.isGroupActive(context.groupId))
+    ? context.groupId
+    : null;
+
+  // Crear tarea y asignaciones
+  const taskId = TaskService.createTask(
+    {
+      description: description || '',
+      due_date: dueDate ?? null,
+      group_id: groupIdToUse,
+      created_by: createdBy,
+    },
+    assignmentUserIds.map(uid => ({
+      user_id: uid,
+      assigned_by: createdBy,
+    }))
+  );
+
+  // Registrar origen del comando para esta tarea (si aplica)
+  try {
+    if (groupIdToUse && isGroupId(groupIdToUse) && context.messageId) {
+      const participant = typeof context.participant === 'string' ? context.participant : null;
+      const fromMe = typeof context.fromMe === 'boolean' ? (context.fromMe ? 1 : 0) : null;
+      try {
+        deps.db.prepare(`
+          INSERT OR IGNORE INTO task_origins (task_id, chat_id, message_id, participant, from_me)
+          VALUES (?, ?, ?, ?, ?)
+        `).run(taskId, groupIdToUse, context.messageId, participant, fromMe);
+      } catch {
+        deps.db.prepare(`
+          INSERT OR IGNORE INTO task_origins (task_id, chat_id, message_id)
+          VALUES (?, ?, ?)
+        `).run(taskId, groupIdToUse, context.messageId);
+      }
+    }
+  } catch { }
+
+  // Recuperar la tarea creada para obtener display_code asignado
+  const createdTask = TaskService.getTaskById(taskId);
+
+  const mentionsForSending = assignmentUserIds.map(uid => `${uid}@s.whatsapp.net`);
+
+  // Resolver nombres útiles
+  const groupName = groupIdToUse ? GroupSyncService.activeGroupsCache.get(groupIdToUse) : null;
+
+  const assignedDisplayNames = await Promise.all(
+    assignmentUserIds.map(async uid => {
+      const name = await ContactsService.getDisplayName(uid);
+      return name || uid;
+    })
+  );
+
+  const responses: Msg[] = [];
+
+  // 1) Ack al creador con formato compacto
+  const dueFmt = formatDDMM(dueDate);
+  const ownerPart = assignmentUserIds.length === 0
+    ? `${ICONS.unassigned} ${groupName ? ` (${groupName})` : ''}`
+    : `${assignmentUserIds.length > 1 ? '👥' : '👤'} ${assignedDisplayNames.join(', ')}`;
+  const ackLines = [
+    `${ICONS.create} ${codeId(taskId, createdTask?.display_code)} ${description || '(sin descripción)'}`,
+    dueFmt ? `${ICONS.date} ${dueFmt}` : null,
+    ownerPart
+  ].filter(Boolean);
+  responses.push({
+    recipient: createdBy,
+    message: [ackLines.join('\n'), '', CTA_HELP].join('\n'),
+    mentions: mentionsForSending.length > 0 ? mentionsForSending : undefined
+  });
+
+  // 2) DM a cada asignado (excluyendo al creador para evitar duplicados)
+  for (const uid of assignmentUserIds) {
+    if (uid === createdBy) continue;
+    responses.push({
+      recipient: uid,
+      message: [
+        `${ICONS.assignNotice} ${codeId(taskId, createdTask?.display_code)}`,
+        `${description || '(sin descripción)'}`,
+        formatDDMM(dueDate) ? `${ICONS.date} ${formatDDMM(dueDate)}` : null,
+        groupName ? `Grupo: ${groupName}` : null,
+        `- Completar: \`/t x ${createdTask?.display_code}\``,
+        `- Soltar: \`/t soltar ${createdTask?.display_code}\``
+      ].filter(Boolean).join('\n') + '\n\n' + CTA_HELP,
+      mentions: [`${createdBy}@s.whatsapp.net`]
+    });
+  }
+
+  // A4: DM JIT al asignador si quedaron menciones/tokens irrecuperables
+  responses.push(...buildJitAssigneePrompt(createdBy, context.groupId, unresolvedAssigneeDisplays));
+
+  // Fase 2: disparar paquete de onboarding (2 DMs) tras crear tarea en grupo
+  try {
+    const gid = groupIdToUse || (isGroupId(context.groupId) ? context.groupId : null);
+    maybeEnqueueOnboardingBundle(deps.db, {
+      gid,
+      createdBy,
+      assignmentUserIds,
+      taskId,
+      displayCode: createdTask?.display_code ?? null,
+      description: description || ''
+    });
+  } catch {}
+
+  return responses;
+}
diff --git a/src/services/commands/index.ts b/src/services/commands/index.ts
index 9da8e0a..9f173a9 100644
--- a/src/services/commands/index.ts
+++ b/src/services/commands/index.ts
@@ -11,6 +11,7 @@ import { handleVer } from './handlers/ver';
 import { handleCompletar } from './handlers/completar';
 import { handleTomar } from './handlers/tomar';
 import { handleSoltar } from './handlers/soltar';
+import { handleNueva } from './handlers/nueva';
 import { ResponseQueue } from '../response-queue';
 import { isGroupId } from '../../utils/whatsapp';
 import { Metrics } from '../metrics';
@@ -41,6 +42,11 @@ export async function route(context: RouteContext, deps?: { db: Database }): Pro
   const database = deps?.db;
   if (!database) return null;
 
+  if (action === 'nueva') {
+    try { ResponseQueue.setOnboardingAggregatesMetrics(); } catch {}
+    return await handleNueva(context as any, { db: database });
+  }
+
   if (action === 'ver') {
     // Métricas de alias (mias/todas) como en el código actual
     try {
diff --git a/src/services/onboarding.ts b/src/services/onboarding.ts
new file mode 100644
index 0000000..2750595
--- /dev/null
+++ b/src/services/onboarding.ts
@@ -0,0 +1,198 @@
+import type { Database } from 'bun:sqlite';
+import { ResponseQueue } from './response-queue';
+import { GroupSyncService } from './group-sync';
+import { AllowedGroups } from './allowed-groups';
+import { Metrics } from './metrics';
+import { randomTokenBase64Url } from '../utils/crypto';
+import { ICONS } from '../utils/icons';
+import { codeId, code, bold, padTaskId } from '../utils/formatting';
+
+type CommandResponse = {
+  recipient: string;
+  message: string;
+  mentions?: string[];
+};
+
+/**
+ * Construye (si aplica) el DM JIT al creador cuando hay menciones/tokens irrecuperables.
+ * Aplica flags y métricas exactamente como en CommandService.
+ */
+export function buildJitAssigneePrompt(createdBy: string, groupId: string, unresolvedAssigneeDisplays: string[]): CommandResponse[] {
+  const responses: CommandResponse[] = [];
+  const unresolvedList = Array.from(new Set((unresolvedAssigneeDisplays || []).filter(Boolean)));
+  if (unresolvedList.length === 0) return responses;
+
+  const isTest = String(process.env.NODE_ENV || '').toLowerCase() === 'test';
+  const enabled = isTest
+    ? String(process.env.ONBOARDING_ENABLE_IN_TEST || '').toLowerCase() === 'true'
+    : (() => {
+      const v = process.env.ONBOARDING_PROMPTS_ENABLED;
+      return v == null ? true : ['true', '1', 'yes'].includes(String(v).toLowerCase());
+    })();
+
+  const groupLabel = String(groupId && groupId.includes('@g.us') ? groupId : 'dm');
+  if (!enabled) {
+    try { Metrics.inc('onboarding_prompts_skipped_total', 1, { group_id: groupLabel, source: 'jit_assignee_failure', reason: 'disabled' }); } catch { }
+    return responses;
+  }
+
+  const bot = String(process.env.CHATBOT_PHONE_NUMBER || '').trim();
+  if (!bot || !/^\d+$/.test(bot)) {
+    try { Metrics.inc('onboarding_prompts_skipped_total', 1, { group_id: groupLabel, source: 'jit_assignee_failure', reason: 'missing_bot_number' }); } catch { }
+    return responses;
+  }
+
+  const list = unresolvedList.join(', ');
+  let groupCtx = '';
+  if (groupId && groupId.includes('@g.us')) {
+    const name = GroupSyncService.activeGroupsCache.get(groupId) || groupId;
+    groupCtx = ` (en el grupo ${name})`;
+  }
+  const msg = `No puedo asignar a ${list} aún${groupCtx}. Pídele que toque este enlace y diga 'activar': https://wa.me/${bot}`;
+  responses.push({ recipient: createdBy, message: msg });
+  try { Metrics.inc('onboarding_prompts_sent_total', 1, { group_id: groupLabel, source: 'jit_assignee_failure' }); } catch { }
+
+  return responses;
+}
+
+/**
+ * Encola el paquete de 2 DMs de onboarding para miembros del grupo (si aplica).
+ * Respeta gating AllowedGroups, cap, cooldown, delays y métricas.
+ */
+export function maybeEnqueueOnboardingBundle(db: Database, params: {
+  gid: string | null;
+  createdBy: string;
+  assignmentUserIds: string[];
+  taskId: number;
+  displayCode: number | null;
+  description: string;
+}): void {
+  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 = params.gid;
+
+  if (!enabled) {
+    try { Metrics.inc('onboarding_dm_skipped_total', 1, { reason: 'disabled', group_id: String(gid || '') }); } catch {}
+    return;
+  }
+  if (!gid) {
+    try { Metrics.inc('onboarding_dm_skipped_total', 1, { reason: 'no_group', group_id: '' }); } catch {}
+    return;
+  }
+
+  // Gating enforce
+  let allowed = true;
+  try {
+    const mode = String(process.env.GROUP_GATING_MODE || 'off').toLowerCase();
+    if (mode === 'enforce') {
+      try { (AllowedGroups as any).dbInstance = db; } catch {}
+      allowed = AllowedGroups.isAllowed(gid);
+    }
+  } catch {}
+  if (!allowed) {
+    try { Metrics.inc('onboarding_dm_skipped_total', 1, { reason: 'not_allowed', group_id: String(gid) }); } catch {}
+    return;
+  }
+
+  const displayCode = params.displayCode;
+  if (!(typeof displayCode === 'number' && Number.isFinite(displayCode))) {
+    try { Metrics.inc('onboarding_dm_skipped_total', 1, { reason: 'no_display_code', group_id: String(gid) }); } catch {}
+    return;
+  }
+
+  // Candidatos
+  let members = GroupSyncService.listActiveMemberIds(gid);
+  const bot = String(process.env.CHATBOT_PHONE_NUMBER || '').trim();
+  const exclude = new Set<string>([params.createdBy, ...params.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 {}
+    return;
+  }
+
+  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 delayEnv = Number(process.env.ONBOARDING_BUNDLE_DELAY_MS);
+  const delay2 = Number.isFinite(delayEnv) && delayEnv >= 0 ? Math.floor(delayEnv) : 5000 + Math.floor(Math.random() * 5001); // 5–10s
+
+  const groupLabel = GroupSyncService.activeGroupsCache.get(gid) || gid;
+  const codeStr = String(displayCode);
+  const desc = (params.description || '(sin descripción)').trim();
+  const shortDesc = desc.length > 100 ? (desc.slice(0, 100) + '…') : desc;
+
+  const codeInline = codeId(params.taskId, displayCode);
+  const cmdTake = code(`/t tomar ${padTaskId(displayCode)}`);
+  const cmdInfo = code(`/t info`);
+  const groupBold = bold(`‘${groupLabel}’`);
+
+  const msg1 = `¡Hola!, soy el bot de tareas. En ${groupBold} acaban de crear una tarea: ${codeInline} _${shortDesc}_
+- Para hacerte cargo: ${cmdTake}
+- Más info: ${cmdInfo}
+${ICONS.info} Solo escribo por privado.
+${ICONS.info} Cuando reciba tu primer mensaje ya no te enviaré más este recordatorio`;
+
+  const msg2 = `GUÍA RÁPIDA
+Puedes interactuar escribiéndome por privado:
+- Ver tus tareas: ${code('/t mias')}
+- Ver todas: ${code('/t todas')}
+- Recibe recordatorios: ${code('/t configurar diario|l-v|semanal|off')}
+- Web: ${code('/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 = db.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: params.taskId, display_code: displayCode }, 0);
+      ResponseQueue.enqueueOnboarding(rcpt, msg2, { variant, part: 2, bundle_id: bundleId, group_id: gid, task_id: params.taskId, display_code: displayCode }, delay2);
+      try { Metrics.inc('onboarding_bundle_sent_total', 1, { variant, group_id: String(gid) }); } catch {}
+    } catch {}
+  }
+}