Agente: variar fallbacks + drop reply_templates (código muerto)

Los 5 fallbacks hardcoded en runTurn.js (cuando el LLM no llama tools,
está paused, awaiting_human, o tira error) mandaban siempre el mismo
string al cliente. Ahora hay un módulo fallbackReplies con 4 kinds × 3
variantes que rotan random — sin pasar por el LLM, sin estado, cero
costo de latencia.

Drop de la tabla reply_templates: tenía 45 variantes seedeadas en 13
slots pero ningún código la consultaba (grep -rn "reply_templates" en
src/ y public/ → cero referencias). Era código zombi que iba contra el
goal "conversacional, no menu-driven" del CLAUDE.md.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

db/migrations/20260518100000_woo_products_allowed_order_units_backfill.sql

@@ -0,0 +1,24 @@
+-- migrate:up
+-- Backfill _allowed_order_units en raw para productos existentes.
+-- Regla:
+--   sell_unit_override = 'unit'    -> ["unit"]   (regla dura)
+--   sell_unit_override = 'kg' o null -> ["kg","unit"] (default permisivo)
+-- Idempotente: solo aplica si el campo no existe todavía.
+
+update woo_products_snapshot
+set raw = jsonb_set(
+  coalesce(raw, '{}'::jsonb),
+  '{_allowed_order_units}',
+  case
+    when coalesce(raw->>'_sell_unit_override', 'kg') = 'unit' then '["unit"]'::jsonb
+    else '["kg","unit"]'::jsonb
+  end,
+  true
+)
+where raw is null
+   or not (raw ? '_allowed_order_units');
+
+-- migrate:down
+update woo_products_snapshot
+set raw = raw - '_allowed_order_units'
+where raw ? '_allowed_order_units';

db/migrations/20260518110000_drop_reply_templates.sql

@@ -0,0 +1,10 @@
+-- migrate:up
+-- Eliminar tabla reply_templates: el código actual no la consulta (cero referencias
+-- en src/ y public/). Las 45 filas seedeadas son código zombi.
+DROP INDEX IF EXISTS idx_reply_active;
+DROP TABLE IF EXISTS reply_templates;
+
+-- migrate:down
+-- No recreamos. Para restaurar el schema + seed correr en orden:
+--   20260501110000_reply_templates.sql (schema + index)
+--   20260501130000_seed_piaf_settings_and_replies.sql (45 filas)

public/components/products-crud.js

@@ -458,6 +458,24 @@ class ProductsCrud extends HTMLElement {
           Define si este producto se vende por peso o por unidad
         </div>
       </div>
+      <div class="field">
+        <label>Unidades aceptadas al pedir</label>
+        <div id="allowedUnitsBox" style="display:flex;gap:14px;align-items:center;">
+          <label style="display:inline-flex;gap:6px;align-items:center;font-size:13px;">
+            <input type="checkbox" id="cbAllowKg" ${this.computeAllowedUI(p, currentUnit).includes("kg") ? "checked" : ""} ${currentUnit === "unit" ? "disabled" : ""}>
+            Permitir pedir por kg
+          </label>
+          <label style="display:inline-flex;gap:6px;align-items:center;font-size:13px;">
+            <input type="checkbox" id="cbAllowUnit" ${this.computeAllowedUI(p, currentUnit).includes("unit") ? "checked" : ""} ${currentUnit === "unit" ? "disabled" : ""}>
+            Permitir pedir por unidad
+          </label>
+        </div>
+        <div style="font-size:11px;color:var(--text-muted);margin-top:4px;" id="allowedUnitsHint">
+          ${currentUnit === "unit"
+            ? 'Producto por unidad: solo se acepta pedir por unidad.'
+            : 'Para productos vendidos por kg, permitir también pedido por unidad (ej: milanesas, hamburguesas).'}
+        </div>
+      </div>
       <div class="field">
         <label>Categorías actuales</label>
         <div id="currentCategories" style="display:flex;flex-wrap:wrap;gap:6px;min-height:30px;margin-bottom:8px;">
@@ -505,6 +523,39 @@ class ProductsCrud extends HTMLElement {
     // Bind save button
     this.shadowRoot.getElementById("saveProduct").onclick = () => this.saveProduct();
 
+    // Bind sell_unit select: si cambia a "unit", forzar checks; si pasa a "kg", rehabilitar.
+    const sellUnitSel = this.shadowRoot.getElementById("sellUnit");
+    const cbKg = this.shadowRoot.getElementById("cbAllowKg");
+    const cbUnit = this.shadowRoot.getElementById("cbAllowUnit");
+    const hintEl = this.shadowRoot.getElementById("allowedUnitsHint");
+    sellUnitSel.onchange = () => {
+      if (sellUnitSel.value === "unit") {
+        cbKg.checked = false;
+        cbUnit.checked = true;
+        cbKg.disabled = true;
+        cbUnit.disabled = true;
+        hintEl.textContent = 'Producto por unidad: solo se acepta pedir por unidad.';
+      } else {
+        cbKg.disabled = false;
+        cbUnit.disabled = false;
+        // Default permisivo al pasar a kg
+        if (!cbKg.checked && !cbUnit.checked) {
+          cbKg.checked = true;
+          cbUnit.checked = true;
+        }
+        hintEl.textContent = 'Para productos vendidos por kg, permitir también pedido por unidad (ej: milanesas, hamburguesas).';
+      }
+    };
+    const validateAtLeastOne = (e) => {
+      if (!cbKg.checked && !cbUnit.checked) {
+        modal.warn("Tenés que dejar al menos una unidad aceptada.");
+        // Revertir: marcar el que se acaba de desmarcar
+        e.target.checked = true;
+      }
+    };
+    cbKg.addEventListener("change", validateAtLeastOne);
+    cbUnit.addEventListener("change", validateAtLeastOne);
+
     // Bind add category button
     this.shadowRoot.getElementById("addCatBtn").onclick = () => this.addCategoryToProduct();
     
@@ -563,15 +614,18 @@ class ProductsCrud extends HTMLElement {
     const categories = this.getCurrentProductCategories();
     const sellUnitSelect = this.shadowRoot.getElementById("sellUnit");
     const sell_unit = sellUnitSelect?.value || p.sell_unit || 'kg';
+    const allowed_order_units = this.getCurrentAllowedOrderUnits();
 
     try {
-      await api.updateProduct(p.woo_product_id, { sell_unit, categories });
+      await api.updateProduct(p.woo_product_id, { sell_unit, categories, allowed_order_units });
 
       // Actualizar localmente
       p.categories = JSON.stringify(categories.map(name => ({ name })));
+      if (allowed_order_units) p.allowed_order_units = allowed_order_units;
       const idx = this.items.findIndex(i => i.woo_product_id === p.woo_product_id);
       if (idx >= 0) {
         this.items[idx].categories = p.categories;
+        if (allowed_order_units) this.items[idx].allowed_order_units = allowed_order_units;
       }
 
       // Mostrar feedback breve
@@ -604,6 +658,24 @@ class ProductsCrud extends HTMLElement {
     return [...tags].map(t => t.dataset.category);
   }
 
+  computeAllowedUI(p, currentUnit) {
+    if (currentUnit === "unit") return ["unit"];
+    if (Array.isArray(p?.allowed_order_units) && p.allowed_order_units.length > 0) {
+      return p.allowed_order_units;
+    }
+    return ["kg", "unit"];
+  }
+
+  getCurrentAllowedOrderUnits() {
+    const cbKg = this.shadowRoot.getElementById("cbAllowKg");
+    const cbUnit = this.shadowRoot.getElementById("cbAllowUnit");
+    if (!cbKg || !cbUnit) return undefined;
+    const list = [];
+    if (cbKg.checked) list.push("kg");
+    if (cbUnit.checked) list.push("unit");
+    return list.length ? list : ["unit"];
+  }
+
   async saveProduct() {
     if (this.selectedItems.length !== 1) return;
 
@@ -613,20 +685,23 @@ class ProductsCrud extends HTMLElement {
 
     const sell_unit = sellUnitSelect.value;
     const categories = this.getCurrentProductCategories();
+    const allowed_order_units = this.getCurrentAllowedOrderUnits();
 
     btn.disabled = true;
     btn.textContent = "Guardando...";
 
     try {
-      await api.updateProduct(p.woo_product_id, { sell_unit, categories });
+      await api.updateProduct(p.woo_product_id, { sell_unit, categories, allowed_order_units });
 
       // Actualizar localmente
       p.sell_unit = sell_unit;
       p.categories = JSON.stringify(categories.map(name => ({ name })));
+      if (allowed_order_units) p.allowed_order_units = sell_unit === "unit" ? ["unit"] : allowed_order_units;
       const idx = this.items.findIndex(i => i.woo_product_id === p.woo_product_id);
       if (idx >= 0) {
         this.items[idx].sell_unit = sell_unit;
         this.items[idx].categories = p.categories;
+        if (allowed_order_units) this.items[idx].allowed_order_units = p.allowed_order_units;
       }
 
       btn.textContent = "Guardado!";

public/lib/api.js

@@ -116,12 +116,12 @@ export const api = {
     }).then(r => r.json());
   },
 
-  async updateProduct(wooProductId, { sell_unit, categories }) {
+  async updateProduct(wooProductId, { sell_unit, categories, allowed_order_units }) {
-    return fetch(`/products/${encodeURIComponent(wooProductId)}`, {
+    return safeFetch(`/products/${encodeURIComponent(wooProductId)}`, {
       method: "PATCH",
       headers: { "Content-Type": "application/json" },
-      body: JSON.stringify({ sell_unit, categories }),
+      body: JSON.stringify({ sell_unit, categories, allowed_order_units }),
-    }).then(r => r.json());
+    });
   },
 
   async updateProductsUnit(wooProductIds, { sell_unit }) {

src/modules/0-ui/controllers/products.js

@@ -111,13 +111,23 @@ export const makeUpdateProduct = (tenantIdOrFn) => async (req, res) => {
   try {
     const tenantId = typeof tenantIdOrFn === "function" ? tenantIdOrFn() : tenantIdOrFn;
     const wooProductId = req.params.id;
-    const { sell_unit, categories } = req.body || {};
+    const { sell_unit, categories, allowed_order_units } = req.body || {};
 
     if (sell_unit && !["kg", "unit"].includes(sell_unit)) {
       return res.status(400).json({ ok: false, error: "invalid_sell_unit" });
     }
 
-    const result = await handleUpdateProduct({ tenantId, wooProductId, sell_unit, categories });
+    if (allowed_order_units !== undefined) {
+      if (!Array.isArray(allowed_order_units) || allowed_order_units.length === 0) {
+        return res.status(400).json({ ok: false, error: "invalid_allowed_order_units" });
+      }
+      const valid = allowed_order_units.every((u) => u === "kg" || u === "unit");
+      if (!valid) {
+        return res.status(400).json({ ok: false, error: "invalid_allowed_order_units" });
+      }
+    }
+
+    const result = await handleUpdateProduct({ tenantId, wooProductId, sell_unit, categories, allowed_order_units });
     res.json(result);
   } catch (err) {
     console.error(err);

src/modules/0-ui/db/repo.js

@@ -25,7 +25,8 @@ export async function listProducts({ tenantId, q = "", limit = 2000, offset = 0
         attributes_normalized,
         updated_at as refreshed_at,
         raw as payload,
-        coalesce(raw->>'_sell_unit_override', 'kg') as sell_unit
+        coalesce(raw->>'_sell_unit_override', 'kg') as sell_unit,
+        raw->'_allowed_order_units' as allowed_order_units_raw
       from woo_products_snapshot
       where tenant_id = $1
         and (name ilike $2 or coalesce(slug,'') ilike $2 or coalesce(raw->>'SKU', raw->>'sku', '') ilike $2)
@@ -47,7 +48,8 @@ export async function listProducts({ tenantId, q = "", limit = 2000, offset = 0
         attributes_normalized,
         updated_at as refreshed_at,
         raw as payload,
-        coalesce(raw->>'_sell_unit_override', 'kg') as sell_unit
+        coalesce(raw->>'_sell_unit_override', 'kg') as sell_unit,
+        raw->'_allowed_order_units' as allowed_order_units_raw
       from woo_products_snapshot
       where tenant_id = $1
       order by name asc
@@ -106,7 +108,7 @@ export async function bulkUpdateProductSellUnit({ tenantId, wooProductIds, sell_
   return { updated: result.rowCount };
 }
 
-export async function updateProduct({ tenantId, wooProductId, sell_unit, categories }) {
+export async function updateProduct({ tenantId, wooProductId, sell_unit, categories, allowed_order_units }) {
   // Build the update - combine all raw updates into one
   let updates = [];
   let params = [tenantId, wooProductId];
@@ -133,8 +135,14 @@ export async function updateProduct({ tenantId, wooProductId, sell_unit, categor
     paramIdx++;
   }
 
+  if (allowed_order_units) {
+    rawExpr = `jsonb_set(${rawExpr}, '{_allowed_order_units}', $${paramIdx}::jsonb)`;
+    params.push(JSON.stringify(allowed_order_units));
+    paramIdx++;
+  }
+
   // Only add raw update if we modified it
-  if (sell_unit || categories) {
+  if (sell_unit || categories || allowed_order_units) {
     updates.push(`raw = ${rawExpr}`);
   }
 

src/modules/0-ui/handlers/products.js

@@ -1,5 +1,20 @@
 import { searchSnapshotItems, syncFromWoo, pushProductToWoo } from "../../shared/wooSnapshot.js";
 import { listProducts, getProductByWooId, updateProductSellUnit, bulkUpdateProductSellUnit, updateProduct, insertAuditLog } from "../db/repo.js";
+import { computeAllowedOrderUnits, normalizeUnitToken } from "../../shared/sellUnitPolicy.js";
+
+function resolveAllowedOrderUnitsForRow(row) {
+  if (!row) return row;
+  let parsed = row.allowed_order_units_raw;
+  if (typeof parsed === "string") {
+    try { parsed = JSON.parse(parsed); } catch { parsed = null; }
+  }
+  const allowed = computeAllowedOrderUnits({
+    sell_unit: row.sell_unit,
+    raw_override: parsed,
+  });
+  const { allowed_order_units_raw, ...rest } = row;
+  return { ...rest, allowed_order_units: allowed };
+}
 
 export async function handleSearchProducts({ tenantId, q = "", limit = "10", forceWoo = "0" }) {
   const { items, source } = await searchSnapshotItems({
@@ -11,12 +26,14 @@ export async function handleSearchProducts({ tenantId, q = "", limit = "10", for
 }
 
 export async function handleListProducts({ tenantId, q = "", limit = 2000, offset = 0 }) {
-  const items = await listProducts({ tenantId, q, limit, offset });
+  const rows = await listProducts({ tenantId, q, limit, offset });
+  const items = rows.map(resolveAllowedOrderUnitsForRow);
   return { items };
 }
 
 export async function handleGetProduct({ tenantId, wooProductId }) {
-  return getProductByWooId({ tenantId, wooProductId });
+  const row = await getProductByWooId({ tenantId, wooProductId });
+  return resolveAllowedOrderUnitsForRow(row);
 }
 
 export async function handleSyncProducts({ tenantId }) {
@@ -63,9 +80,23 @@ export async function handleBulkUpdateProductUnit({ tenantId, wooProductIds, sel
 /**
  * Actualiza un producto localmente y automáticamente lo pushea a WooCommerce
  */
-export async function handleUpdateProduct({ tenantId, wooProductId, sell_unit, categories }) {
+export async function handleUpdateProduct({ tenantId, wooProductId, sell_unit, categories, allowed_order_units }) {
+  // Aplicar regla dura: si sell_unit final es "unit", forzar allowed_order_units = ["unit"].
+  // Tomamos el sell_unit final (el que viene en el patch o el actual del producto).
+  let effectiveAllowed = allowed_order_units;
+  if (allowed_order_units !== undefined) {
+    let effectiveSellUnit = sell_unit;
+    if (!effectiveSellUnit) {
+      const current = await getProductByWooId({ tenantId, wooProductId });
+      effectiveSellUnit = current?.sell_unit || null;
+    }
+    if (normalizeUnitToken(effectiveSellUnit) === "unit") {
+      effectiveAllowed = ["unit"];
+    }
+  }
+
   // 1. Guardar cambios localmente
-  await updateProduct({ tenantId, wooProductId, sell_unit, categories });
+  await updateProduct({ tenantId, wooProductId, sell_unit, categories, allowed_order_units: effectiveAllowed });
 
   // 2. Auto-push a WooCommerce (best effort - no falla si Woo no responde)
   let wooPushResult = null;
@@ -86,6 +117,7 @@ export async function handleUpdateProduct({ tenantId, wooProductId, sell_unit, c
     changes: {
       sell_unit: { new: sell_unit },
       categories: { new: categories },
+      allowed_order_units: { new: effectiveAllowed },
       woo_synced: wooPushResult?.updated ?? false
     },
     actor: 'ui'
@@ -96,6 +128,7 @@ export async function handleUpdateProduct({ tenantId, wooProductId, sell_unit, c
     woo_product_id: wooProductId,
     sell_unit,
     categories,
+    allowed_order_units: effectiveAllowed,
     woo_synced: wooPushResult?.updated ?? false
   };
 }

src/modules/3-turn-engine/agent/fallbackReplies.js

@@ -0,0 +1,30 @@
+const VARIANTS = {
+  no_understanding: [
+    "Disculpame, no te entendí. ¿Me lo decís de otra forma?",
+    "Perdón, no te seguí. ¿Lo repetís?",
+    "Mmm, no me quedó claro. ¿Cómo era?",
+  ],
+  awaiting_human: [
+    "Te paso con alguien que pueda ayudarte.",
+    "Dejame que te derive a un compañero, ya te responde.",
+    "Te conecto con una persona, esperá un toque.",
+  ],
+  paused: [
+    "Dale, cuando quieras seguimos.",
+    "Bueno, te espero. Avisame cuando estés.",
+    "Listo, lo dejamos en pausa. Decime cuando seguimos.",
+  ],
+  llm_error: [
+    "Disculpame, tuve un problema. ¿Lo intentás de nuevo?",
+    "Uy, se me trabó algo. ¿Lo escribís de nuevo?",
+    "Perdón, algo no anduvo bien. ¿Repetís?",
+  ],
+};
+
+export function pickFallbackReply(kind) {
+  const pool = VARIANTS[kind] || VARIANTS.no_understanding;
+  const idx = Math.floor(Math.random() * pool.length);
+  return pool[idx];
+}
+
+export const __FALLBACK_VARIANTS__ = VARIANTS;

src/modules/3-turn-engine/agent/fallbackReplies.test.js

@@ -0,0 +1,40 @@
+import { pickFallbackReply, __FALLBACK_VARIANTS__ } from "./fallbackReplies.js";
+
+const KINDS = ["no_understanding", "awaiting_human", "paused", "llm_error"];
+
+describe("pickFallbackReply", () => {
+  it("cada kind tiene al menos 3 variantes", () => {
+    for (const k of KINDS) {
+      expect(__FALLBACK_VARIANTS__[k].length).toBeGreaterThanOrEqual(3);
+    }
+  });
+
+  it("retorna string no vacío para cada kind", () => {
+    for (const k of KINDS) {
+      const out = pickFallbackReply(k);
+      expect(typeof out).toBe("string");
+      expect(out.length).toBeGreaterThan(0);
+    }
+  });
+
+  it("retorna una variante del pool correspondiente", () => {
+    for (const k of KINDS) {
+      const pool = __FALLBACK_VARIANTS__[k];
+      const out = pickFallbackReply(k);
+      expect(pool).toContain(out);
+    }
+  });
+
+  it("kind inexistente cae a no_understanding (no rompe)", () => {
+    const out = pickFallbackReply("ese_kind_no_existe");
+    expect(__FALLBACK_VARIANTS__.no_understanding).toContain(out);
+  });
+
+  it("variación: 100 llamadas cubren al menos 2 variantes distintas por kind", () => {
+    for (const k of KINDS) {
+      const seen = new Set();
+      for (let i = 0; i < 100; i++) seen.add(pickFallbackReply(k));
+      expect(seen.size).toBeGreaterThanOrEqual(2);
+    }
+  });
+});

src/modules/3-turn-engine/agent/runTurn.js

@@ -16,6 +16,7 @@ import { SYSTEM_PROMPT } from "./systemPrompt.js";
 import { TOOL_SCHEMAS } from "./tools/schemas.js";
 import { executeToolCall } from "./tools/executor.js";
 import { getCustomerProfile } from "./customerProfile.js";
+import { pickFallbackReply } from "./fallbackReplies.js";
 import { debug as dbg } from "../../shared/debug.js";
 
 const MAX_TOOL_CALLS = parseInt(process.env.AGENT_MAX_TOOL_CALLS || "10", 10);
@@ -212,7 +213,7 @@ export async function runTurnAgent({
       if (!calls.length) {
         // Sin tool calls → forzar say con fallback y salir
         audit.no_tool_calls = true;
-        ctx.say_text = ctx.say_text || msg.content || "Disculpame, no te entendí. ¿Me lo decís de otra forma?";
+        ctx.say_text = ctx.say_text || msg.content || pickFallbackReply("no_understanding");
         turnDone = true;
         break;
       }
@@ -241,9 +242,13 @@ export async function runTurnAgent({
     if (dbg.llm) console.error("[agent] error", llmError);
   }
 
-  // Si no hay say, fallback determinista
+  // Si no hay say, fallback con variante random
   if (!ctx.say_text) {
-    ctx.say_text = pickFallbackReply(ctx, llmError);
+    const kind = ctx.awaiting_human ? "awaiting_human"
+      : ctx.paused ? "paused"
+      : llmError ? "llm_error"
+      : "no_understanding";
+    ctx.say_text = pickFallbackReply(kind);
     audit.fallback_used = true;
   }
 
@@ -294,13 +299,6 @@ export async function runTurnAgent({
   };
 }
 
-function pickFallbackReply(ctx, err) {
-  if (ctx.awaiting_human) return "Te paso con un humano que pueda ayudarte.";
-  if (ctx.paused) return "Dale, cuando quieras seguimos.";
-  if (err) return "Disculpame, tuve un problema. ¿Lo intentás de nuevo?";
-  return "No te seguí, ¿me lo decís de otra forma?";
-}
-
 function detectIntent(toolCalls = []) {
   const names = toolCalls.map((c) => c.name);
   if (names.includes("confirm_order")) return "confirm_order";

src/modules/3-turn-engine/agent/systemPrompt.js

@@ -113,5 +113,21 @@ LIMITES TÉCNICOS:
 
 LIMITES OPERATIVOS DEL COMERCIO (NO LOS NEGOCIES):
 - Lo que diga el bloque store del working_memory.
-- Si el cliente pide algo fuera de eso, decí qué es lo que sí podemos.`;
+- Si el cliente pide algo fuera de eso, decí qué es lo que sí podemos.
+
+UNIDADES (cómo se pide vs cómo se vende):
+- Cada candidato/pending trae allowed_order_units = ["kg"], ["unit"] o ["kg","unit"].
+  Es CÓMO PUEDE PEDIRLO EL CLIENTE, no cómo lo vende el comercio.
+- ["unit"] → solo unidad ("3 botellas", "5 huevos"). Si el cliente pide en kg/g
+  para uno de estos, decile que ese producto solo se vende por unidad y preguntale
+  cuántas quiere.
+- ["kg"] → solo peso ("500g", "1kg"). Si el cliente da una cantidad sin unidad
+  ("quiero 2"), preguntale el peso.
+- ["kg","unit"] (ej: milanesas, hamburguesas, chorizos) → preguntale al cliente
+  si lo quiere por peso o por unidad. Ejemplo: "¿Las milanesas las querés por
+  peso (500g, 1kg) o por unidad (cantidad)?".
+- Si una tool te devuelve error "unit_not_allowed", NO insistas con la misma
+  unidad: releé allowed_order_units y pedile al cliente la unidad correcta.
+- Cuando el pending tiene needs_unit_choice=true, antes de llamar set_quantity
+  asegurate de que el cliente declaró la unidad explícitamente.`;
 

src/modules/3-turn-engine/agent/tools/addToCart.js

@@ -7,6 +7,7 @@
 
 import { getSnapshotItemsByIds } from "../../../shared/wooSnapshot.js";
 import { createCartItem } from "../../orderModel.js";
+import { computeAllowedOrderUnits, isUnitAllowed, normalizeUnitToken } from "../../../shared/sellUnitPolicy.js";
 
 export async function addToCartTool(args, ctx) {
   const { woo_id, qty, unit } = args;
@@ -25,13 +26,31 @@ export async function addToCartTool(args, ctx) {
     };
   }
 
+  // Validar unit contra allowed_order_units del producto
+  const allowed = Array.isArray(found.allowed_order_units) && found.allowed_order_units.length
+    ? found.allowed_order_units
+    : computeAllowedOrderUnits({ sell_unit: found.sell_unit });
+  if (!isUnitAllowed(unit, allowed)) {
+    return {
+      ok: false,
+      error: "unit_not_allowed",
+      product: { woo_id, name: found.name },
+      allowed_order_units: allowed,
+      hint: `Para "${found.name}" solo se acepta pedir en: ${allowed.join(", ")}. Preguntale al cliente cómo lo quiere.`,
+    };
+  }
+
+  // Normalizar unit: g se persiste como tal (la conversión a kg ocurre en wooOrders).
+  const normalizedUnit = unit;
+
   // Crear item de carrito
   const newItem = createCartItem({
     woo_id,
     qty,
-    unit,
+    unit: normalizedUnit,
     name: found.name,
     price: found.price ?? null,
+    allowed_order_units: allowed,
   });
 
   // Si ya existe el woo_id en el cart, sumamos cantidad

src/modules/3-turn-engine/agent/tools/schemas.js

@@ -29,7 +29,7 @@ export const TOOL_SCHEMAS = [
     type: "function",
     function: {
       name: "add_to_cart",
-      description: "Agrega un producto resuelto al carrito.",
+      description: "Agrega un producto resuelto al carrito. Validá la unit contra allowed_order_units del candidato; si no coincide la tool devuelve unit_not_allowed.",
       parameters: {
         type: "object",
         additionalProperties: false,
@@ -46,7 +46,7 @@ export const TOOL_SCHEMAS = [
     type: "function",
     function: {
       name: "set_quantity",
-      description: "Setea la cantidad de un producto pendiente que ya está resuelto pero faltaba qty/unit.",
+      description: "Setea la cantidad de un producto pendiente que ya está resuelto pero faltaba qty/unit. Validá la unit contra selected_allowed_order_units del pending; si no coincide la tool devuelve unit_not_allowed.",
       parameters: {
         type: "object",
         additionalProperties: false,

src/modules/3-turn-engine/agent/tools/searchCatalog.js

@@ -8,6 +8,7 @@
 import { retrieveCandidates } from "../../catalogRetrieval.js";
 import { searchSnapshotItems } from "../../../shared/wooSnapshot.js";
 import { pool } from "../../../shared/db/pool.js";
+import { computeAllowedOrderUnits } from "../../../shared/sellUnitPolicy.js";
 
 const MIN_GOOD_SCORE = 0.4;
 
@@ -18,6 +19,9 @@ function summarizeCandidate(c, idx) {
     name: c.name,
     price: c.price ?? null,
     sell_unit: c.sell_unit || null,
+    allowed_order_units: Array.isArray(c.allowed_order_units) && c.allowed_order_units.length
+      ? c.allowed_order_units
+      : computeAllowedOrderUnits({ sell_unit: c.sell_unit }),
     score: typeof c._score === "number" ? Number(c._score.toFixed(2)) : null,
   };
 }

src/modules/3-turn-engine/agent/tools/selectCandidate.js

@@ -11,6 +11,7 @@ import {
   PendingStatus,
 } from "../../orderModel.js";
 import { getSnapshotItemsByIds } from "../../../shared/wooSnapshot.js";
+import { computeAllowedOrderUnits, isUnitAllowed, normalizeUnitToken } from "../../../shared/sellUnitPolicy.js";
 
 export async function selectCandidateTool(args, ctx) {
   const { pending_id, woo_id } = args;
@@ -33,29 +34,46 @@ export async function selectCandidateTool(args, ctx) {
     };
   }
 
-  const sellsByWeight =
+  const allowed = Array.isArray(found.allowed_order_units) && found.allowed_order_units.length
-    !found.sell_unit || !["unit", "unidad"].includes(found.sell_unit);
+    ? found.allowed_order_units
-  const displayUnit = found.sell_unit === "unit" ? "unit" : sellsByWeight ? "kg" : "unit";
+    : computeAllowedOrderUnits({ sell_unit: found.sell_unit });
 
   const hasRequestedQty =
     pending.requested_qty != null && Number.isFinite(pending.requested_qty) && pending.requested_qty > 0;
+
+  // Resolver la unidad: si el usuario declaró una unit válida → usarla.
+  // Si allowed tiene una sola opción → tomarla. Si allowed = ["kg","unit"] y no hay declaración → ambigua.
+  let finalUnit = null;
+  let needsUnitChoice = false;
+  if (pending.requested_unit && isUnitAllowed(pending.requested_unit, allowed)) {
+    finalUnit = normalizeUnitToken(pending.requested_unit);
+  } else if (allowed.length === 1) {
+    finalUnit = allowed[0];
+  } else {
+    needsUnitChoice = true;
+  }
+
+  const displayUnit = finalUnit || (allowed.includes("kg") ? "kg" : allowed[0]);
+  const sellsByWeight = displayUnit === "kg";
+  const needsQty = !hasRequestedQty;
   const finalQty = hasRequestedQty ? pending.requested_qty : null;
-  const finalUnit = pending.requested_unit || displayUnit;
+  const isReady = !needsQty && !needsUnitChoice;
-  const needsQty = sellsByWeight && !hasRequestedQty;
 
   const updated = updatePendingItem(ctx.order, pending_id, {
     selected_woo_id: woo_id,
     selected_name: found.name,
     selected_price: found.price ?? null,
     selected_unit: displayUnit,
+    selected_allowed_order_units: allowed,
+    needs_unit_choice: needsUnitChoice,
     candidates: [],
-    qty: needsQty ? null : finalQty,
+    qty: isReady ? finalQty : null,
-    unit: finalUnit,
+    unit: finalUnit || displayUnit,
-    status: needsQty ? PendingStatus.NEEDS_QUANTITY : PendingStatus.READY,
+    status: isReady ? PendingStatus.READY : PendingStatus.NEEDS_QUANTITY,
   });
   ctx.order = moveReadyToCart(updated);
 
-  if (!needsQty) {
+  if (isReady) {
     ctx.pending_actions.push({
       type: "add_to_cart",
       payload: { woo_id, qty: finalQty, unit: finalUnit },
@@ -65,8 +83,15 @@ export async function selectCandidateTool(args, ctx) {
 
   return {
     ok: true,
-    selected: { woo_id, name: found.name, unit: displayUnit, sells_by_weight: sellsByWeight },
+    selected: {
+      woo_id,
+      name: found.name,
+      unit: displayUnit,
+      sells_by_weight: sellsByWeight,
+      allowed_order_units: allowed,
+    },
     needs_quantity: needsQty,
+    needs_unit_choice: needsUnitChoice,
     cart_size: (ctx.order.cart || []).length,
   };
 }

src/modules/3-turn-engine/agent/tools/setQuantity.js

@@ -4,6 +4,7 @@
  */
 
 import { updatePendingItem, moveReadyToCart, PendingStatus } from "../../orderModel.js";
+import { isUnitAllowed } from "../../../shared/sellUnitPolicy.js";
 
 export async function setQuantityTool(args, ctx) {
   const { pending_id, qty, unit } = args;
@@ -15,9 +16,24 @@ export async function setQuantityTool(args, ctx) {
     return { ok: false, error: "pending_not_resolved", hint: "Llamá select_candidate primero para resolver el producto." };
   }
 
+  // Validar unit contra allowed_order_units del producto (cacheado en pending al hacer select).
+  const allowed = Array.isArray(pending.selected_allowed_order_units) && pending.selected_allowed_order_units.length
+    ? pending.selected_allowed_order_units
+    : ["kg", "unit"];
+  if (!isUnitAllowed(unit, allowed)) {
+    return {
+      ok: false,
+      error: "unit_not_allowed",
+      product: { woo_id: pending.selected_woo_id, name: pending.selected_name },
+      allowed_order_units: allowed,
+      hint: `Para "${pending.selected_name}" solo se acepta pedir en: ${allowed.join(", ")}. Preguntale al cliente cómo lo quiere.`,
+    };
+  }
+
   const updated = updatePendingItem(ctx.order, pending_id, {
     qty,
     unit,
+    needs_unit_choice: false,
     status: PendingStatus.READY,
   });
   ctx.order = moveReadyToCart(updated);

src/modules/3-turn-engine/agent/workingMemory.js

@@ -57,6 +57,7 @@ export function buildWorkingMemory({
     qty: it.qty,
     unit: it.unit,
     price: it.price ?? null,
+    allowed_order_units: it.allowed_order_units ?? null,
   }));
 
   const pending = (order.pending || []).map((p) => ({
@@ -66,6 +67,8 @@ export function buildWorkingMemory({
     selected_woo_id: p.selected_woo_id ?? null,
     selected_name: p.selected_name ?? null,
     selected_unit: p.selected_unit ?? null,
+    selected_allowed_order_units: p.selected_allowed_order_units ?? null,
+    needs_unit_choice: !!p.needs_unit_choice,
     requested_qty: p.requested_qty ?? null,
     requested_unit: p.requested_unit ?? null,
     candidates: (p.candidates || []).slice(0, 8).map((c, i) => ({
@@ -74,6 +77,7 @@ export function buildWorkingMemory({
       name: c.name,
       price: c.price ?? null,
       display_unit: c.display_unit ?? null,
+      allowed_order_units: c.allowed_order_units ?? null,
     })),
   }));
 

src/modules/3-turn-engine/orderModel.js

@@ -34,13 +34,14 @@ export function createEmptyOrder() {
 /**
  * Crea un item de carrito confirmado
  */
-export function createCartItem({ woo_id, qty, unit, name = null, price = null }) {
+export function createCartItem({ woo_id, qty, unit, name = null, price = null, allowed_order_units = null }) {
   return {
     woo_id,
     qty: Number(qty) || 1,
     unit: unit || "unit", // "kg" | "g" | "unit"
     name,
     price,
+    allowed_order_units,
   };
 }
 
@@ -55,6 +56,8 @@ export function createPendingItem({
   selected_name = null,
   selected_price = null,
   selected_unit = null,
+  selected_allowed_order_units = null,
+  needs_unit_choice = false,
   qty = null,
   unit = null,
   status = PendingStatus.NEEDS_TYPE,
@@ -64,11 +67,13 @@ export function createPendingItem({
   return {
     id: id || `pending_${Date.now()}_${Math.random().toString(36).slice(2, 8)}`,
     query,
-    candidates,      // [{ woo_id, name, price, display_unit }]
+    candidates,                    // [{ woo_id, name, price, display_unit, allowed_order_units }]
     selected_woo_id,               // Producto elegido (null si NEEDS_TYPE)
     selected_name,
     selected_price,
     selected_unit,                 // Unidad del producto seleccionado
+    selected_allowed_order_units,  // Unidades válidas para este producto (cache)
+    needs_unit_choice,             // Si true, el LLM tiene que preguntar la unidad antes de cerrar
     qty,                           // Cantidad (null si NEEDS_QUANTITY)
     unit,                          // Unidad elegida por usuario
     status,
@@ -96,6 +101,7 @@ export function moveReadyToCart(order) {
         unit: item.unit || item.selected_unit || "unit",
         name: item.selected_name,
         price: item.selected_price,
+        allowed_order_units: item.selected_allowed_order_units || null,
       });
       
       if (existingIdx >= 0) {

src/modules/4-woo-orders/wooOrders.js

@@ -1,6 +1,7 @@
 import { getDecryptedTenantEcommerceConfig } from "../2-identity/db/repo.js";
 import { debug as dbg } from "../shared/debug.js";
-import { getSnapshotPriceByWooId } from "../shared/wooSnapshot.js";
+import { getSnapshotPriceByWooId, getSnapshotItemsByIds } from "../shared/wooSnapshot.js";
+import { normalizeUnitToken } from "../shared/sellUnitPolicy.js";
 import * as ordersRepo from "./ordersRepo.js";
 
 // --- Simple in-memory lock to serialize work per key ---
@@ -129,15 +130,33 @@ function toMoney(value) {
 async function buildLineItems({ tenantId, basket }) {
   const items = normalizeBasketItems(basket);
   const lineItems = [];
+
+  // Traer en bulk el sell_unit del snapshot para cada producto del basket.
+  const productIds = [...new Set(items.map((it) => Number(it.product_id)).filter(Boolean))];
+  const sellUnitByWoo = new Map();
+  if (productIds.length) {
+    const lookup = await getSnapshotItemsByIds({ tenantId, wooProductIds: productIds });
+    for (const p of lookup?.items || []) {
+      sellUnitByWoo.set(Number(p.woo_product_id), p.sell_unit || null);
+    }
+  }
+
   for (const it of items) {
     const productId = Number(it.product_id);
     const unit = String(it.unit).toLowerCase();
     const qty = Number(it.quantity);
     if (!productId || !Number.isFinite(qty) || qty <= 0) continue;
     const pricePerKg = await getWooProductPrice({ tenantId, productId });
+    const productSellUnit = sellUnitByWoo.get(productId);
+    const productSellUnitNorm = normalizeUnitToken(productSellUnit);
+    const requestedUnitNorm = normalizeUnitToken(unit);
+    // Mismatch: cliente pidió "unit" pero el producto se vende por kg (u otro)
+    const mismatch = requestedUnitNorm === "unit" && productSellUnitNorm !== "unit";
 
     if (unit === "unit") {
-      const total = pricePerKg != null ? toMoney(pricePerKg * qty) : null;
+      // Si hay mismatch (producto kg pedido como unidad) → no enviar subtotal/total,
+      // dejar que Woo calcule con el precio del producto. El comercio resuelve al armar.
+      const total = !mismatch && pricePerKg != null ? toMoney(pricePerKg * qty) : null;
       lineItems.push({
         product_id: productId,
         ...(it.variation_id ? { variation_id: it.variation_id } : {}),
@@ -145,6 +164,8 @@ async function buildLineItems({ tenantId, basket }) {
         ...(total ? { subtotal: total, total } : {}),
         meta_data: [
           { key: "unit", value: "unit" },
+          { key: "sell_unit_product", value: productSellUnit || "" },
+          { key: "unit_mode_mismatch", value: mismatch ? "true" : "false" },
         ],
       });
       continue;
@@ -165,6 +186,7 @@ async function buildLineItems({ tenantId, basket }) {
         { key: "unit", value: "g" },
         { key: "weight_g", value: grams },
         { key: "unit_price_per_kg", value: pricePerKg },
+        { key: "sell_unit_product", value: productSellUnit || "" },
       ],
     });
   }

src/modules/shared/sellUnitPolicy.js

@@ -0,0 +1,23 @@
+export function normalizeUnitToken(unit) {
+  const s = String(unit || "").trim().toLowerCase();
+  if (s === "g" || s === "kg" || s === "gramos" || s === "kilo" || s === "kilos") return "kg";
+  if (s === "unit" || s === "unidad" || s === "unidades" || s === "u") return "unit";
+  return null;
+}
+
+export function computeAllowedOrderUnits({ sell_unit, raw_override } = {}) {
+  if (normalizeUnitToken(sell_unit) === "unit") return ["unit"];
+
+  if (Array.isArray(raw_override) && raw_override.length > 0) {
+    const filtered = [...new Set(raw_override.map(normalizeUnitToken).filter((u) => u !== null))];
+    if (filtered.length > 0) return filtered;
+  }
+  return ["kg", "unit"];
+}
+
+export function isUnitAllowed(unit, allowed) {
+  const normalized = normalizeUnitToken(unit);
+  if (normalized === null) return false;
+  const list = Array.isArray(allowed) ? allowed : [];
+  return list.some((u) => normalizeUnitToken(u) === normalized);
+}

src/modules/shared/sellUnitPolicy.test.js

@@ -0,0 +1,63 @@
+import { computeAllowedOrderUnits, isUnitAllowed, normalizeUnitToken } from "./sellUnitPolicy.js";
+
+describe("normalizeUnitToken", () => {
+  it("normaliza gramos a kg", () => {
+    expect(normalizeUnitToken("g")).toBe("kg");
+    expect(normalizeUnitToken("gramos")).toBe("kg");
+  });
+  it("normaliza unidad a unit", () => {
+    expect(normalizeUnitToken("unidad")).toBe("unit");
+    expect(normalizeUnitToken("unidades")).toBe("unit");
+    expect(normalizeUnitToken("U")).toBe("unit");
+  });
+  it("retorna null para tokens desconocidos", () => {
+    expect(normalizeUnitToken(null)).toBe(null);
+    expect(normalizeUnitToken("")).toBe(null);
+    expect(normalizeUnitToken("garlic")).toBe(null);
+    expect(normalizeUnitToken("pack")).toBe(null);
+  });
+});
+
+describe("computeAllowedOrderUnits", () => {
+  it("regla dura: sell_unit=unit ignora override y retorna ['unit']", () => {
+    expect(computeAllowedOrderUnits({ sell_unit: "unit", raw_override: ["kg"] })).toEqual(["unit"]);
+    expect(computeAllowedOrderUnits({ sell_unit: "unidad", raw_override: ["kg", "unit"] })).toEqual(["unit"]);
+  });
+  it("sell_unit=kg con override válido retorna el override filtrado", () => {
+    expect(computeAllowedOrderUnits({ sell_unit: "kg", raw_override: ["unit"] })).toEqual(["unit"]);
+    expect(computeAllowedOrderUnits({ sell_unit: "kg", raw_override: ["kg"] })).toEqual(["kg"]);
+  });
+  it("sell_unit=kg sin override retorna default ['kg','unit']", () => {
+    expect(computeAllowedOrderUnits({ sell_unit: "kg" })).toEqual(["kg", "unit"]);
+    expect(computeAllowedOrderUnits({ sell_unit: "kg", raw_override: null })).toEqual(["kg", "unit"]);
+    expect(computeAllowedOrderUnits({ sell_unit: "kg", raw_override: [] })).toEqual(["kg", "unit"]);
+  });
+  it("sell_unit nulo se trata como kg (default permisivo)", () => {
+    expect(computeAllowedOrderUnits({ sell_unit: null })).toEqual(["kg", "unit"]);
+  });
+  it("override con tokens inválidos se filtra", () => {
+    expect(computeAllowedOrderUnits({ sell_unit: "kg", raw_override: ["pack", "kg"] })).toEqual(["kg"]);
+    expect(computeAllowedOrderUnits({ sell_unit: "kg", raw_override: ["nonsense"] })).toEqual(["kg", "unit"]);
+  });
+});
+
+describe("isUnitAllowed", () => {
+  it("acepta g cuando kg está permitido", () => {
+    expect(isUnitAllowed("g", ["kg"])).toBe(true);
+    expect(isUnitAllowed("gramos", ["kg", "unit"])).toBe(true);
+  });
+  it("rechaza unit cuando solo kg está permitido", () => {
+    expect(isUnitAllowed("unit", ["kg"])).toBe(false);
+  });
+  it("acepta unit cuando unit está permitido", () => {
+    expect(isUnitAllowed("unidad", ["unit"])).toBe(true);
+    expect(isUnitAllowed("unit", ["kg", "unit"])).toBe(true);
+  });
+  it("rechaza kg cuando solo unit está permitido", () => {
+    expect(isUnitAllowed("kg", ["unit"])).toBe(false);
+    expect(isUnitAllowed("500g", ["unit"])).toBe(false);
+  });
+  it("lista vacía rechaza todo", () => {
+    expect(isUnitAllowed("kg", [])).toBe(false);
+  });
+});

src/modules/shared/wooSnapshot.js

@@ -1,6 +1,7 @@
 import { pool } from "./db/pool.js";
 import { getDecryptedTenantEcommerceConfig } from "../2-identity/db/repo.js";
 import { debug as dbg } from "./debug.js";
+import { computeAllowedOrderUnits } from "./sellUnitPolicy.js";
 
 async function fetchWoo({ url, method = "GET", body = null, timeout = 20000, headers = {} }) {
   const controller = new AbortController();
@@ -180,6 +181,10 @@ function snapshotRowToItem(row) {
       price_html: null,
     },
     sell_unit: raw?._sell_unit_override || null,
+    allowed_order_units: computeAllowedOrderUnits({
+      sell_unit: raw?._sell_unit_override,
+      raw_override: raw?._allowed_order_units,
+    }),
     source: "snapshot",
   };
 }
@@ -274,7 +279,13 @@ export async function upsertSnapshotItems({ tenantId, items, runId = null }) {
         attributes_normalized = excluded.attributes_normalized,
         date_modified = excluded.date_modified,
         run_id = excluded.run_id,
-        raw = excluded.raw,
+        raw = coalesce(woo_products_snapshot.raw, '{}'::jsonb)
+              || excluded.raw
+              || jsonb_strip_nulls(jsonb_build_object(
+                   '_sell_unit_override',  woo_products_snapshot.raw->'_sell_unit_override',
+                   '_allowed_order_units', woo_products_snapshot.raw->'_allowed_order_units',
+                   '_categories_override', woo_products_snapshot.raw->'_categories_override'
+                 )),
         updated_at = now()
     `;
     await pool.query(q, [