diff --git a/apps/web/src/app/core/api/game-api.models.ts b/apps/web/src/app/core/api/game-api.models.ts
index 02066da..d7d1a6e 100644
--- a/apps/web/src/app/core/api/game-api.models.ts
+++ b/apps/web/src/app/core/api/game-api.models.ts
@@ -430,6 +430,14 @@ export interface ExchangeResult {
   capacities: LootCapacity[];
 }
 
+/** One gate on an offer, as the server phrased it (slice 0.8.5 §5, §8). */
+export interface ShopOfferRequirement {
+  label: string;
+  current: number | null;
+  required: number | null;
+  met: boolean;
+}
+
 export interface ShopOfferView {
   itemKey: string;
   itemName: string;
@@ -438,6 +446,13 @@ export interface ShopOfferView {
   currencyType: string;
   price: number;
   quantity: number;
+  /**
+   * Optional so fixtures written before slice 0.8.5 (e.g. the trade-in store's
+   * own spec, out of this task's scope) keep compiling untouched. The server
+   * always sends both fields; the template treats a missing one as "none".
+   */
+  effectSummary?: string | null;
+  requirements?: ShopOfferRequirement[];
   unlocked: boolean;
   affordable: boolean;
 }
diff --git a/apps/web/src/app/features/npc/merchant-page.component.html b/apps/web/src/app/features/npc/merchant-page.component.html
index a024c04..6da1ea0 100644
--- a/apps/web/src/app/features/npc/merchant-page.component.html
+++ b/apps/web/src/app/features/npc/merchant-page.component.html
@@ -222,6 +222,28 @@
                 <span class="shop-row__description">{{
                   offer.itemDescription
                 }}</span>
+                @if (offer.effectSummary) {
+                  <span class="shop-row__effect" data-effect>{{
+                    offer.effectSummary
+                  }}</span>
+                }
+                @for (
+                  requirement of offer.requirements ?? [];
+                  track requirement.label
+                ) {
+                  <span
+                    class="shop-row__requirement"
+                    [class.shop-row__requirement--met]="requirement.met"
+                    data-requirement
+                  >
+                    {{ requirement.label }}
+                    @if (!requirement.met && requirement.current !== null) {
+                      <span class="shop-row__current"
+                        >· Current: {{ requirement.current }}</span
+                      >
+                    }
+                  </span>
+                }
               </div>
               <span class="shop-row__price">{{ offer.price }} Silver</span>
               <button
diff --git a/apps/web/src/app/features/npc/merchant-page.component.scss b/apps/web/src/app/features/npc/merchant-page.component.scss
index ef36532..e21acf0 100644
--- a/apps/web/src/app/features/npc/merchant-page.component.scss
+++ b/apps/web/src/app/features/npc/merchant-page.component.scss
@@ -351,6 +351,26 @@
   font-size: var(--ar-font-sm);
 }
 
+.shop-row__effect {
+  color: var(--ar-text);
+  font-size: 0.75rem;
+}
+
+/* A lock the player can measure themselves against, not a dead end
+   (slice 0.8.5 §5). */
+.shop-row__requirement {
+  color: var(--ar-gold);
+  font-size: 0.75rem;
+}
+
+.shop-row__requirement--met {
+  color: var(--ar-text-muted);
+}
+
+.shop-row__current {
+  color: var(--ar-text-muted);
+}
+
 .shop-receipt {
   display: flex;
   gap: var(--ar-space-2);
diff --git a/apps/web/src/app/features/npc/merchant-page.component.spec.ts b/apps/web/src/app/features/npc/merchant-page.component.spec.ts
index f3ce881..d3aeaef 100644
--- a/apps/web/src/app/features/npc/merchant-page.component.spec.ts
+++ b/apps/web/src/app/features/npc/merchant-page.component.spec.ts
@@ -83,6 +83,8 @@ const SHOP: ShopView = {
       currencyType: 'SILVER',
       price: 12,
       quantity: 1,
+      effectSummary: null,
+      requirements: [],
       unlocked: true,
       affordable: true,
     },
@@ -94,6 +96,8 @@ const SHOP: ShopView = {
       currencyType: 'SILVER',
       price: 400,
       quantity: 1,
+      effectSummary: null,
+      requirements: [],
       unlocked: false,
       affordable: false,
     },
@@ -160,6 +164,74 @@ async function render(): Promise<{
   return { fixture, element: fixture.nativeElement as HTMLElement, store };
 }
 
+/**
+ * Renders the merchant page with a caller-supplied shop and opens the shop
+ * panel, so requirement/effect tests don't need to repeat the NPC and
+ * exchange fixtures they don't care about.
+ */
+async function renderMerchantWithShop(
+  shopOverrides: Partial<ShopView>,
+): Promise<{
+  fixture: ComponentFixture<MerchantPageComponent>;
+  element: HTMLElement;
+  store: MerchantStore;
+}> {
+  const shop: ShopView = {
+    shopKey: 'borin-supplies',
+    shopName: "Quartermaster's Supplies",
+    npcKey: 'borin-quartermaster',
+    silver: 100,
+    offers: [],
+    ...shopOverrides,
+  };
+
+  const api = {
+    getNpcInteraction: vi.fn(() => of(INTERACTION)),
+    getTradeIn: vi.fn(() => of(EXCHANGE)),
+    getShop: vi.fn(() => of(shop)),
+    tradeIn: vi.fn(() => of(TRADE_RESULT)),
+    purchase: vi.fn(() =>
+      of({
+        shopKey: 'borin-supplies',
+        itemKey: 'small-healing-potion',
+        itemName: 'Small Healing Potion',
+        quantity: 1,
+        silverSpent: 12,
+        silverBalance: 88,
+      }),
+    ),
+  };
+
+  await TestBed.configureTestingModule({
+    imports: [MerchantPageComponent],
+    providers: [
+      provideZonelessChangeDetection(),
+      { provide: GameApiService, useValue: api },
+      {
+        provide: ActivatedRoute,
+        useValue: {
+          snapshot: { paramMap: { get: () => 'borin-quartermaster' } },
+        },
+      },
+    ],
+  }).compileComponents();
+
+  const fixture = TestBed.createComponent(MerchantPageComponent);
+  const store = TestBed.inject(MerchantStore);
+
+  fixture.detectChanges();
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  fixture.detectChanges();
+
+  const element = fixture.nativeElement as HTMLElement;
+  element
+    .querySelector<HTMLButtonElement>('[data-action="OPEN_SHOP"]')
+    ?.click();
+  fixture.detectChanges();
+
+  return { fixture, element, store };
+}
+
 describe('MerchantPageComponent', () => {
   afterEach(() => TestBed.resetTestingModule());
 
@@ -308,4 +380,137 @@ describe('MerchantPageComponent', () => {
 
     expect(element.querySelector('[data-purse]')?.textContent).toContain('100');
   });
+
+  it('shows the requirement and the current value on a locked offer', async () => {
+    // A visible lock with a number attached is a goal; a hidden offer is not
+    // (slice §5).
+    const { fixture } = await renderMerchantWithShop({
+      offers: [
+        {
+          itemKey: 'basic-trophy-pouch',
+          itemName: 'Basic Trophy Pouch',
+          itemDescription: 'Capacity: 5 Raider Trophies',
+          iconPath: '/images/items/basic-trophy-pouch.png',
+          currencyType: 'SILVER',
+          price: 40,
+          quantity: 1,
+          effectSummary: 'Capacity: 5 Raider Trophies',
+          requirements: [
+            {
+              label: 'Requires Border Watch Reputation 25',
+              current: 14,
+              required: 25,
+              met: false,
+            },
+          ],
+          unlocked: false,
+          affordable: true,
+        },
+      ],
+    });
+
+    const row = fixture.nativeElement.querySelector(
+      '[data-shop-item="basic-trophy-pouch"]',
+    );
+    expect(row.textContent).toContain('Requires Border Watch Reputation 25');
+    expect(row.textContent).toContain('Current: 14');
+    expect(row.querySelector('button').disabled).toBe(true);
+  });
+
+  it('shows what a purchase does', async () => {
+    const { fixture } = await renderMerchantWithShop({
+      offers: [
+        {
+          itemKey: 'bandit-blade',
+          itemName: 'Bandit Blade',
+          itemDescription: 'A roughly serrated blade, forged for quick raids.',
+          iconPath: '/images/items/bandit-blade.png',
+          currencyType: 'SILVER',
+          price: 60,
+          quantity: 1,
+          effectSummary: '11 Weapon Damage, +1 Attack',
+          requirements: [
+            {
+              label: 'Requires World Renown 3',
+              current: 1,
+              required: 3,
+              met: false,
+            },
+          ],
+          unlocked: false,
+          affordable: true,
+        },
+      ],
+    });
+
+    const row = fixture.nativeElement.querySelector(
+      '[data-shop-item="bandit-blade"]',
+    );
+    expect(row.textContent).toContain('11 Weapon Damage, +1 Attack');
+  });
+
+  it('does not label an open offer as requiring anything unmet', async () => {
+    const { fixture } = await renderMerchantWithShop({
+      offers: [
+        {
+          itemKey: 'small-healing-potion',
+          itemName: 'Small Healing Potion',
+          itemDescription: 'A bitter draught.',
+          iconPath: '/images/items/potion.png',
+          currencyType: 'SILVER',
+          price: 12,
+          quantity: 1,
+          effectSummary: null,
+          requirements: [],
+          unlocked: true,
+          affordable: true,
+        },
+      ],
+    });
+
+    const row = fixture.nativeElement.querySelector(
+      '[data-shop-item="small-healing-potion"]',
+    );
+    expect(row.querySelector('[data-requirement]')).toBeNull();
+    expect(row.querySelector('button').disabled).toBe(false);
+  });
+
+  it('renders a bypassed offer as buyable even with an unmet requirement shown', async () => {
+    // A later slice opens an offer through a quest bypass rather than by
+    // meeting the stated requirement. The server still describes the
+    // requirement it evaluated, but `unlocked` is what actually gates the
+    // button -- an unmet requirement must not re-lock a bypassed offer.
+    const { fixture } = await renderMerchantWithShop({
+      offers: [
+        {
+          itemKey: 'referred-trinket',
+          itemName: 'Referred Trinket',
+          itemDescription: 'A favour, called in.',
+          iconPath: '/images/items/referred-trinket.png',
+          currencyType: 'SILVER',
+          price: 20,
+          quantity: 1,
+          effectSummary: null,
+          requirements: [
+            {
+              label: 'Requires Border Watch Reputation 25',
+              current: 14,
+              required: 25,
+              met: false,
+            },
+          ],
+          unlocked: true,
+          affordable: true,
+        },
+      ],
+    });
+
+    const row = fixture.nativeElement.querySelector(
+      '[data-shop-item="referred-trinket"]',
+    );
+    expect(row.textContent).toContain('Requires Border Watch Reputation 25');
+    const button = row.querySelector('button');
+    expect(button.disabled).toBe(false);
+    expect(button.textContent).toContain('Buy');
+  });
 });