P14:[{"_341":82,"_342":79,"_343":344},"app1","app2","diffPatch","diff --git a/app/components/product-chat.tsx b/app/components/product-chat.tsx\nindex 5091d08..a14c326 100644\n--- a/app/components/product-chat.tsx\n+++ b/app/components/product-chat.tsx\n@@ -4,6 +4,9 @@ import { MessageCircle, Send, X } from 'lucide-react'\n import { useState } from 'react'\n import { useNavigate, useRouteLoaderData } from 'react-router'\n import { ProductCard } from '#app/components/product-card'\n+import { useCart } from '#app/contexts/cart.js'\n+import { addProductToCart } from '#app/lib/cart-actions.ts'\n+import { addToCartDef } from '#app/tools/cart.ts'\n import { navigateToDef } from '#app/tools/navigation.ts'\n \n export type ProductChatContext = {\n@@ -45,6 +48,7 @@ function useCurrentProduct(): ProductChatContext | undefined {\n export function ProductChat() {\n \tconst product = useCurrentProduct()\n \tconst navigate = useNavigate()\n+\tconst cart = useCart()\n \tconst [isOpen, setIsOpen] = useState(false)\n \tconst [draft, setDraft] = useState('')\n \n@@ -53,9 +57,38 @@ export function ProductChat() {\n \t\treturn { destination }\n \t})\n \n-\tconst { messages, sendMessage, isLoading } = useChat({\n+\t/**\n+\t * 🐨 Build the second client tool below. Same pattern as `navigateTo`\n+\t * above — but this one closes over `cart` (from `useCart()`) instead\n+\t * of `navigate`.\n+\t *\n+\t * 💰 Use `addToCartDef.client(execute)` and store in `const addToCart`.\n+\t * 💰 The callback receives the args the model picked. You only need\n+\t * `productId`, `size`, `color`, `quantity` to actually do the\n+\t * add — `productName` is for the approval prompt UI, not the cart.\n+\t * 💰 Call `addProductToCart({ productId, size, color, quantity }, cart)`\n+\t * to do the work. It's already imported. It returns a Promise, so\n+\t * your callback should be `async`.\n+\t * 💰 Return `{ added: true }` so the model knows the add succeeded.\n+\t *\n+\t * 🦉 Notice this tool's definition has `needsApproval: true` (you set\n+\t * that in `cart.ts`). That means TanStack AI will *not* call your\n+\t * `.client(...)` callback until the customer approves. The approval\n+\t * UI is rendered further down in `messages.map(...)` — the click\n+\t * handlers there are also yours to wire up.\n+\t *\n+\t * 🦺 Down there, `part.name === 'addToCart'` is a type error until you\n+\t * add `addToCart` to `tools` below. The message parts are typed from\n+\t * the tools you pass to `useChat`.\n+\t */\n+\tvoid addToCartDef\n+\tvoid addProductToCart\n+\tvoid cart\n+\n+\tconst { messages, sendMessage, isLoading, interrupts } = useChat({\n \t\tconnection: fetchServerSentEvents('/api/chat'),\n \t\tforwardedProps: product ? { productId: product.productId } : {},\n+\t\t// 🐨 Add `addToCart` to this list once you've built it above.\n \t\ttools: [navigateTo],\n \t})\n \n@@ -115,10 +148,17 @@ export function ProductChat() {\n \t\t\t\t\t\t\t\t\t\t)\n \t\t\t\t\t\t\t\t\t}\n \t\t\t\t\t\t\t\t\tif (part.type === 'tool-call') {\n-\t\t\t\t\t\t\t\t\t\tconst output = (part as { output?: unknown }).output as\n+\t\t\t\t\t\t\t\t\t\tconst output = part.output as\n \t\t\t\t\t\t\t\t\t\t\t| {\n \t\t\t\t\t\t\t\t\t\t\t\t\tproducts?: Array<{ id: string }>\n \t\t\t\t\t\t\t\t\t\t\t\t\tdestination?: string\n+\t\t\t\t\t\t\t\t\t\t\t\t\tadded?: boolean\n+\t\t\t\t\t\t\t\t\t\t\t\t\tproductName?: string\n+\t\t\t\t\t\t\t\t\t\t\t\t\tvariations?: Array<{\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\tsize: string\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\tcolor: string\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\tquantity: number\n+\t\t\t\t\t\t\t\t\t\t\t\t\t}>\n \t\t\t\t\t\t\t\t\t\t\t }\n \t\t\t\t\t\t\t\t\t\t\t| undefined\n \n@@ -136,6 +176,91 @@ export function ProductChat() {\n \t\t\t\t\t\t\t\t\t\t\t)\n \t\t\t\t\t\t\t\t\t\t}\n \n+\t\t\t\t\t\t\t\t\t\tif (Array.isArray(output?.variations)) {\n+\t\t\t\t\t\t\t\t\t\t\tconst variations = output.variations\n+\t\t\t\t\t\t\t\t\t\t\tconst sizes = Array.from(\n+\t\t\t\t\t\t\t\t\t\t\t\tnew Set(variations.map((v) => v.size)),\n+\t\t\t\t\t\t\t\t\t\t\t)\n+\t\t\t\t\t\t\t\t\t\t\tconst colors = Array.from(\n+\t\t\t\t\t\t\t\t\t\t\t\tnew Set(variations.map((v) => v.color)),\n+\t\t\t\t\t\t\t\t\t\t\t)\n+\t\t\t\t\t\t\t\t\t\t\tconst find = (size: string, color: string) =>\n+\t\t\t\t\t\t\t\t\t\t\t\tvariations.find(\n+\t\t\t\t\t\t\t\t\t\t\t\t\t(v) => v.size === size && v.color === color,\n+\t\t\t\t\t\t\t\t\t\t\t\t)?.quantity\n+\t\t\t\t\t\t\t\t\t\t\treturn (\n+\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t{output.productName\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t? `Variations for ${output.productName}`\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t: 'Available variations'}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t{colors.map((c) => (\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t{c}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t))}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t{sizes.map((s) => (\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t{colors.map((c) => {\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tconst qty = find(s, c)\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tif (qty === undefined) {\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\treturn (\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t—\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t)\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tif (qty === 0) {\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\treturn (\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t0\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t)\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\treturn (\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t{qty}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t)\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t})}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t))}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tSize\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t
\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t{s}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t)\n+\t\t\t\t\t\t\t\t\t\t}\n+\n \t\t\t\t\t\t\t\t\t\tif (output?.destination) {\n \t\t\t\t\t\t\t\t\t\t\treturn (\n \t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t✅ Added to your cart.\n+\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t)\n+\t\t\t\t\t\t\t\t\t\t}\n+\n+\t\t\t\t\t\t\t\t\t\tif (part.name === 'addToCart') {\n+\t\t\t\t\t\t\t\t\t\t\t// 🦉 When the model calls a `needsApproval` tool, the run\n+\t\t\t\t\t\t\t\t\t\t\t// stops and `useChat` puts a pending decision in\n+\t\t\t\t\t\t\t\t\t\t\t// `interrupts`. Each one is bound to its tool call by\n+\t\t\t\t\t\t\t\t\t\t\t// `toolCallId`, so this finds the card's approval.\n+\t\t\t\t\t\t\t\t\t\t\tconst approval = interrupts.find(\n+\t\t\t\t\t\t\t\t\t\t\t\t(interrupt) =>\n+\t\t\t\t\t\t\t\t\t\t\t\t\tinterrupt.kind === 'tool-approval' &&\n+\t\t\t\t\t\t\t\t\t\t\t\t\tinterrupt.toolCallId === part.id &&\n+\t\t\t\t\t\t\t\t\t\t\t\t\tinterrupt.status === 'pending',\n+\t\t\t\t\t\t\t\t\t\t\t)\n+\t\t\t\t\t\t\t\t\t\t\tif (approval?.kind === 'tool-approval') {\n+\t\t\t\t\t\t\t\t\t\t\t\tconst { productName, size, color, quantity } =\n+\t\t\t\t\t\t\t\t\t\t\t\t\tapproval.originalArgs\n+\t\t\t\t\t\t\t\t\t\t\t\treturn (\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t🛒 Add to cart?\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t

{productName}

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tsize {size} · color {color} · qty {quantity}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t{/*\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t 🐨 Wire these buttons up. Resolve the interrupt with\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t `true` for \"Yes\" and `false` for \"No\".\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t 💰 approval.resolveInterrupt(true)\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t*/}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t {\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t// 🐨 approve\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t}}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tclassName=\"rounded bg-emerald-600 px-3 py-1 text-xs font-medium text-white hover:bg-emerald-700\"\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t>\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tYes, add it\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t {\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t// 🐨 deny\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t}}\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tclassName=\"rounded bg-gray-300 px-3 py-1 text-xs font-medium text-gray-800 hover:bg-gray-400 dark:bg-gray-700 dark:text-gray-100 dark:hover:bg-gray-600\"\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t>\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tNo, cancel\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t

\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t)\n+\t\t\t\t\t\t\t\t\t\t\t}\n+\n+\t\t\t\t\t\t\t\t\t\t\tif (part.approval?.approved === false) {\n+\t\t\t\t\t\t\t\t\t\t\t\treturn (\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\t❌ Cancelled — not added.\n+\t\t\t\t\t\t\t\t\t\t\t\t\t\n+\t\t\t\t\t\t\t\t\t\t\t\t)\n+\t\t\t\t\t\t\t\t\t\t\t}\n+\t\t\t\t\t\t\t\t\t\t}\n+\n \t\t\t\t\t\t\t\t\t\treturn (\n \t\t\t\t\t\t\t\t\t\t\t void\n+}\n+\n+type AddProductArgs = {\n+\tproductId: string\n+\tsize: string\n+\tcolor: string\n+\tquantity: number\n+}\n+\n+/**\n+ * Pre-built helper used by the `addToCart` client tool.\n+ *\n+ * Fetches the product details we need to render the cart item, then calls\n+ * the cart context's `addItem`. Pulling this out keeps the cart-state\n+ * plumbing out of the tool callback so the lesson stays focused on tool\n+ * approvals.\n+ */\n+export async function addProductToCart(args: AddProductArgs, cart: CartLike) {\n+\tconst res = await fetch(`/api/product-mini/${args.productId}`)\n+\tif (!res.ok) {\n+\t\tthrow new Error(`Could not fetch product ${args.productId}`)\n+\t}\n+\tconst product = (await res.json()) as {\n+\t\tid: string\n+\t\tname: string\n+\t\tbrand: string\n+\t\tprice: number\n+\t\timageUrl: string\n+\t}\n+\tcart.addItem({\n+\t\tproductId: product.id,\n+\t\tname: product.name,\n+\t\tbrand: product.brand,\n+\t\tprice: product.price,\n+\t\timageUrl: product.imageUrl,\n+\t\tsize: args.size,\n+\t\tcolor: args.color,\n+\t\tquantity: args.quantity,\n+\t})\n+}\ndiff --git a/app/prompts/system.ts b/app/prompts/system.ts\nindex b5f0d89..2d5d7b0 100644\n--- a/app/prompts/system.ts\n+++ b/app/prompts/system.ts\n@@ -29,5 +29,5 @@ export function buildProductPrompt(product: Product): string {\n - Available variations:\n ${variationLines}\n \n-Use this information to answer questions about this product. When a tool needs a productId, this is the product the customer is looking at — use the Product ID listed above. If the customer asks something that the information above does not cover, say you are not sure rather than guessing.`\n+Use this information to answer questions about this product. When a tool needs a productId, this is the product the customer is looking at — use the Product ID listed above. If the customer wants to add this product to their cart but has not picked a specific size or color, call \\`showVariations\\` first so the customer can see the table and pick — do not list variations as text in your reply. If the customer asks something that the information above does not cover, say you are not sure rather than guessing.`\n }\ndiff --git a/app/routes/api.chat.tsx b/app/routes/api.chat.tsx\nindex 04a178c..b0a734f 100644\n--- a/app/routes/api.chat.tsx\n+++ b/app/routes/api.chat.tsx\n@@ -10,16 +10,24 @@ import {\n \tbuildProductPrompt,\n } from '#app/prompts/system.ts'\n import { PageForwardedProps } from '#app/schemas/chat.js'\n+import { addToCartDef } from '#app/tools/cart.ts'\n import { navigateToDef } from '#app/tools/navigation.ts'\n import {\n \tfindSimilarProducts,\n \trecommendProducts,\n \tsearchProducts,\n } from '#app/tools/products.ts'\n+import { showVariations } from '#app/tools/variations.ts'\n import { type Route } from './+types/api.chat'\n \n const adapter = openRouterText('nvidia/nemotron-3-super-120b-a12b:free')\n \n+// 🐨 The new tool's *definition* is imported above. Add `addToCartDef` to the\n+// `tools: [...]` array on `chat({...})` below — just like you did with\n+// `navigateToDef` last time. Even though `addToCart` runs in the browser\n+// *and* needs approval, the server still has to advertise it to the model.\n+void addToCartDef\n+\n export const action = async ({ request }: Route.ActionArgs) => {\n \tconst { messages, forwardedProps, threadId, runId, parentRunId, resume } =\n \t\tawait chatParamsFromRequest(request)\n@@ -47,6 +55,7 @@ export const action = async ({ request }: Route.ActionArgs) => {\n \t\t\tsearchProducts,\n \t\t\tfindSimilarProducts,\n \t\t\trecommendProducts,\n+\t\t\tshowVariations,\n \t\t\tnavigateToDef,\n \t\t],\n \t\treasoning: 'medium',\ndiff --git a/app/routes/api.product-mini.$productId.tsx b/app/routes/api.product-mini.$productId.tsx\nnew file mode 100644\nindex 0000000..c6cd49c\n--- /dev/null\n+++ b/app/routes/api.product-mini.$productId.tsx\n@@ -0,0 +1,24 @@\n+import { getProductById } from '#app/domain/products.server.ts'\n+import { type Route } from './+types/api.product-mini.$productId'\n+\n+/**\n+ * Lightweight product info endpoint used by the `addToCart` client tool.\n+ *\n+ * The cart needs name, brand, price, and image to render an item — but\n+ * having the model pass all of those as tool arguments would be brittle.\n+ * Instead the tool passes just `{ productId, size, color, quantity }` and\n+ * the browser fetches the rest from this route before calling `addItem`.\n+ */\n+export const loader = async ({ params }: Route.LoaderArgs) => {\n+\tconst product = await getProductById(params.productId)\n+\tif (!product) {\n+\t\treturn Response.json({ error: 'Not found' }, { status: 404 })\n+\t}\n+\treturn Response.json({\n+\t\tid: product.id,\n+\t\tname: product.name,\n+\t\tbrand: product.brand.name,\n+\t\tprice: product.price,\n+\t\timageUrl: product.imageUrl,\n+\t})\n+}\ndiff --git a/app/tools/cart.ts b/app/tools/cart.ts\nnew file mode 100644\nindex 0000000..4791923\n--- /dev/null\n+++ b/app/tools/cart.ts\n@@ -0,0 +1,66 @@\n+import { toolDefinition } from '@tanstack/ai'\n+import { z } from 'zod'\n+\n+const AddToCartInput = z.object({\n+\tproductId: z\n+\t\t.string()\n+\t\t.describe(\n+\t\t\t'The id of the product to add. Comes from a product card the customer just saw, or the currently viewed product.',\n+\t\t),\n+\tproductName: z\n+\t\t.string()\n+\t\t.describe(\n+\t\t\t\"Display name of the product. Shown to the customer in the approval prompt so they can see what's about to be added before they confirm.\",\n+\t\t),\n+\tsize: z\n+\t\t.string()\n+\t\t.describe(\n+\t\t\t'Size variation (e.g. \"9\", \"10\", \"M\", \"L\"). Must be one of the in-stock variations listed in the product context. Do not call this tool without a size — if the customer did not pick one, ask them first.',\n+\t\t),\n+\tcolor: z\n+\t\t.string()\n+\t\t.describe(\n+\t\t\t'Color variation (e.g. \"Black\", \"Red\"). Must be one of the in-stock variations listed in the product context. Do not call this tool without a color — if the customer did not pick one, ask them first.',\n+\t\t),\n+\tquantity: z\n+\t\t.number()\n+\t\t.int()\n+\t\t.min(1)\n+\t\t.max(10)\n+\t\t.describe('How many to add. Default to 1 if not specified.'),\n+})\n+\n+const AddToCartOutput = z.object({\n+\tadded: z.boolean(),\n+})\n+\n+/**\n+ * 🐨 Define and export `addToCartDef` here using `toolDefinition({...})`.\n+ * Same pattern as the tool definitions you've built before — with one\n+ * new field you haven't used yet.\n+ *\n+ * 💰 `name`: `'addToCart'`\n+ *\n+ * 💰 `description`: copy this in exactly —\n+ *\n+ * 'Add a product to the customer\\'s shopping cart. Use this only ' +\n+ * 'when (a) the customer explicitly asks to add something AND (b) ' +\n+ * 'you know both the size and color from the customer. If size or ' +\n+ * 'color is missing, call `showVariations` first so the customer ' +\n+ * 'can see the table and pick — do not call addToCart with guessed ' +\n+ * 'values. The customer will see what is about to be added and click ' +\n+ * 'Yes or No before this tool actually runs.'\n+ *\n+ * 💰 `inputSchema`: plug in the pre-built `AddToCartInput`.\n+ * 💰 `outputSchema`: plug in the pre-built `AddToCartOutput`.\n+ *\n+ * 💰 `needsApproval: true` — the new field. Setting this on the definition\n+ * tells TanStack AI to *pause* before running the tool's callback and\n+ * wait for the UI to confirm. Without it, the tool would just run as\n+ * soon as the model picked it.\n+ *\n+ * 🦉 As with `navigateToDef`, this file exports just the definition. The\n+ * server passes it to `chat({ tools: [...] })` so the model is told the\n+ * tool exists. The browser attaches the `.client(...)` callback that\n+ * actually runs *after the customer approves*.\n+ */\ndiff --git a/app/tools/navigation.ts b/app/tools/navigation.ts\nindex 624b84f..d3f5d57 100644\n--- a/app/tools/navigation.ts\n+++ b/app/tools/navigation.ts\n@@ -1,12 +1,6 @@\n import { toolDefinition } from '@tanstack/ai'\n import { z } from 'zod'\n \n-/**\n- * Single source of truth for which pages the bot is allowed to send the\n- * customer to. The keys become the enum the model picks from, and the values\n- * become the per-page descriptions the model reads to decide which page is\n- * the right pick.\n- */\n const NAVIGABLE_PAGES = {\n \t'/': 'The home page (hero, featured products, categories).',\n \t'/cart': \"The customer's shopping cart.\",\ndiff --git a/app/tools/variations.ts b/app/tools/variations.ts\nnew file mode 100644\nindex 0000000..95f127b\n--- /dev/null\n+++ b/app/tools/variations.ts\n@@ -0,0 +1,43 @@\n+import { toolDefinition } from '@tanstack/ai'\n+import { z } from 'zod'\n+import { getProductById } from '#app/domain/products.server.ts'\n+\n+const ShowVariationsInput = z.object({\n+\tproductId: z\n+\t\t.string()\n+\t\t.describe('The id of the product whose variations should be shown.'),\n+})\n+\n+const ShowVariationsOutput = z.object({\n+\tproductName: z.string(),\n+\tvariations: z.array(\n+\t\tz.object({\n+\t\t\tsize: z.string(),\n+\t\t\tcolor: z.string(),\n+\t\t\tquantity: z.number(),\n+\t\t}),\n+\t),\n+})\n+\n+const showVariationsDef = toolDefinition({\n+\tname: 'showVariations',\n+\tdescription:\n+\t\t'Show the customer a table of all size × color variations for a product, with stock counts per cell. Use this when the customer wants to add a product to their cart but has not picked a size or color yet, or when they ask \"what sizes are available?\" / \"what colors do you have?\". Calling this tool renders an interactive table in the chat — the customer reads it and then tells you what they want.',\n+\tinputSchema: ShowVariationsInput,\n+\toutputSchema: ShowVariationsOutput,\n+})\n+\n+export const showVariations = showVariationsDef.server(async ({ productId }) => {\n+\tconst product = await getProductById(productId)\n+\tif (!product) {\n+\t\treturn { productName: 'unknown product', variations: [] }\n+\t}\n+\treturn {\n+\t\tproductName: product.name,\n+\t\tvariations: product.variations.map((v) => ({\n+\t\t\tsize: v.size,\n+\t\t\tcolor: v.color,\n+\t\t\tquantity: v.quantity,\n+\t\t})),\n+\t}\n+})"]

app/components/product-chat.tsx-43+248App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/lib/cart-actions.ts-0+51App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/prompts/system.ts-5+5App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/routes/api.chat.tsx-22+31App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/routes/api.product-mini.$productId.tsx-0+24App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/tools/cart.ts-0+66App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/tools/navigation.ts-12+6App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/tools/variations.ts-0+43App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/components/product-chat.tsx-43+248App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/lib/cart-actions.ts-0+51App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/prompts/system.ts-5+5App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/routes/api.chat.tsx-22+31App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/routes/api.product-mini.$productId.tsx-0+24App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

app/tools/cart.ts-0+66App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

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app/tools/variations.ts-0+43App 1Copy app 2 file to app 1 (Option+Command to sync without opening)Copy app 1 file to app 2 (Option+Command to sync without opening)App 2

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