diff --git a/src/lib/server/order-item-context-service.ts b/src/lib/server/order-item-context-service.ts
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+++ b/src/lib/server/order-item-context-service.ts
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+/**
+ * order-item-context-service — deterministic SKU-based context for
+ * the order-sprint process modal + orders detail page.
+ *
+ * Mirrors the shape of `item-history-service.ts` but is anchored on
+ * `order_items.id` instead of `quote_items.id`. The four rows
+ * surfaced (last quote, last order, last invoiced, stock) plus a
+ * supplier/cheapest aggregate give the operator the historical
+ * record before they pick a supplier and cost.
+ *
+ * Pure helpers (`normaliseSkuForHistory`, `findBestDescriptionMatch`,
+ * `aggregateSuppliers`, `computeCheapest`, `daysAgo`, `isValidPrice`)
+ * are imported from `item-history-service.ts` — DO NOT duplicate them.
+ */
+
+import { getAdminPocketBase } from "@/lib/server/pocketbase-admin";
+import {
+  normaliseSkuForHistory,
+  findBestDescriptionMatch,
+  aggregateSuppliers,
+  computeCheapest,
+  daysAgo,
+  isValidPrice,
+} from "@/lib/server/item-history-service";
+import type {
+  ItemHistoryMatch,
+  ItemHistorySupplier,
+  ItemHistoryCheapest,
+} from "@/lib/types";
+
+export interface OrderItemLastQuote {
+  quote_item_id: string;
+  quote_id: string;
+  quote_number: string;
+  customer_name: string;
+  company: string;
+  status: string;
+  cost_price: number;
+  selling_price: number;
+  markup_percent: number;
+  days_ago: number;
+}
+
+export interface OrderItemLastOrder {
+  order_item_id: string;
+  order_id: string;
+  order_number: string;
+  company: string;
+  cost_price: number;
+  selling_price: number;
+  markup_percent: number;
+  item_status: string;
+  updated_at: string;
+  days_ago: number;
+}
+
+export interface OrderItemLastInvoiced {
+  order_item_id: string;
+  order_id: string;
+  order_number: string;
+  supplier_invoice_number: string;
+  customer_invoice_number: string;
+  invoiced_date: string;
+  cost_price: number;
+  quantity: number;
+  qty_invoiced: number;
+  days_ago: number;
+}
+
+export interface OrderItemStock {
+  stock_item_id: string;
+  name: string;
+  sku: string;
+  current_qty: number;
+  min_qty: number | null;
+  selling_price: number | null;
+  markup_percent: number | null;
+  status: "in_stock" | "low" | "out";
+}
+
+export interface OrderItemContext {
+  generated_at: string;
+  match: ItemHistoryMatch;
+  last_quote: OrderItemLastQuote | null;
+  last_order: OrderItemLastOrder | null;
+  last_invoiced: OrderItemLastInvoiced | null;
+  stock: OrderItemStock | null;
+  suppliers: ItemHistorySupplier[];
+  cheapest: ItemHistoryCheapest | null;
+}
+
+export interface OrderItemContextResponse extends OrderItemContext {
+  error?: string;
+}
+
+export async function getOrderItemContext(
+  orderItemId: string,
+): Promise<OrderItemContextResponse> {
+  // Implementation lands in Task 2.
+  throw new Error("not implemented");
+}