Adjust for unlimited plan option

packages/vscode/src/quotaProviders.test.ts

@@ -267,6 +267,51 @@ describe('GitHub Copilot quota provider (VS Code parity)', () => {
     assert.equal(result.usage!.windows.premium_interactions!.usedPercent, 25);
     assert.equal(result.usage!.windows.premium_interactions!.valueLabel, '225 / 300 left');
   });
+
+  test('add-on path mirrors the primary window shaping', async () => {
+    stubFetchReturning(() => Promise.resolve(mockResponse({
+      quota_reset_date: '2026-09-01T00:00:00Z',
+      quota_snapshots: {
+        premium_interactions: { entitlement: 300, remaining: 225 },
+      },
+    })));
+
+    const result = await fetchQuotaForProvider('github-copilot-addon');
+
+    assert.equal(result.ok, true);
+    assert.deepEqual(Object.keys(result.usage!.windows), ['premium_interactions']);
+    assert.equal(result.usage!.windows.premium_interactions!.usedPercent, 25);
+  });
+
+  test('reports unlimited plans without a percent', async () => {
+    stubFetchReturning(() => Promise.resolve(mockResponse({
+      quota_reset_date: '2026-09-01T00:00:00Z',
+      quota_snapshots: {
+        premium_interactions: { unlimited: true, entitlement: -1, remaining: -1 },
+      },
+    })));
+
+    const result = await fetchQuotaForProvider('github-copilot');
+
+    assert.equal(result.ok, true);
+    assert.equal(result.usage!.windows.premium_interactions!.usedPercent, null);
+    assert.equal(result.usage!.windows.premium_interactions!.valueLabel, 'Unlimited');
+  });
+
+  test('falls back to percent_remaining when entitlement is unusable', async () => {
+    stubFetchReturning(() => Promise.resolve(mockResponse({
+      quota_reset_date: '2026-09-01T00:00:00Z',
+      quota_snapshots: {
+        premium_interactions: { entitlement: 0, remaining: 0, percent_remaining: 75.5 },
+      },
+    })));
+
+    const result = await fetchQuotaForProvider('github-copilot');
+
+    assert.equal(result.ok, true);
+    assert.ok(Math.abs(result.usage!.windows.premium_interactions!.usedPercent! - 24.5) < 1e-9);
+    assert.equal(result.usage!.windows.premium_interactions!.valueLabel, undefined);
+  });
 });
 
 describe('Claude quota provider (VS Code parity)', () => {

packages/vscode/src/quotaProviders.ts

@@ -1469,14 +1469,35 @@ const buildCopilotWindows = (payload: Record<string, unknown>) => {
   const resetAt = toTimestamp(payload.quota_reset_date);
   const windows: Record<string, UsageWindow> = {};
 
+  // Mirrors the quota semantics of microsoft/vscode-copilot-chat
+  // (CopilotUserQuotaInfo): each snapshot carries entitlement, remaining,
+  // unlimited, and percent_remaining. Unlimited plans report no usable
+  // entitlement; percent_remaining is a server-computed fallback.
   const addWindow = (label: string, snapshot?: Record<string, unknown>) => {
     if (!snapshot) return;
+
+    if (snapshot.unlimited === true) {
+      windows[label] = toUsageWindow({
+        usedPercent: null,
+        windowSeconds: null,
+        resetAt,
+        valueLabel: 'Unlimited',
+      });
+      return;
+    }
+
     const entitlement = toNumber(snapshot.entitlement);
     const remaining = toNumber(snapshot.remaining);
-    const usedPercent = entitlement && remaining !== null
-      ? Math.max(0, Math.min(100, 100 - (remaining / entitlement) * 100))
+    let usedPercent = entitlement !== null && entitlement > 0 && remaining !== null
+      ? Math.min(100, Math.max(0, 100 - (remaining / entitlement) * 100))
       : null;
-    const valueLabel = entitlement !== null && remaining !== null
+    if (usedPercent === null) {
+      const percentRemaining = toNumber(snapshot.percent_remaining);
+      if (percentRemaining !== null) {
+        usedPercent = Math.min(100, Math.max(0, 100 - percentRemaining));
+      }
+    }
+    const valueLabel = entitlement !== null && entitlement > 0 && remaining !== null
       ? `${remaining.toFixed(0)} / ${entitlement.toFixed(0)} left`
       : null;
     windows[label] = toUsageWindow({
@@ -1584,17 +1605,12 @@ const fetchCopilotAddonQuota = async (): Promise<ProviderResult> => {
     }
 
     const payload = await response.json() as Record<string, unknown>;
-    const windows = buildCopilotWindows(payload);
-    const premium = windows.premium_interactions
-      ? { premium_interactions: windows.premium_interactions }
-      : windows;
-
     return buildResult({
       providerId: 'github-copilot-addon',
       providerName: 'GitHub Copilot Add-on',
       ok: true,
       configured: true,
-      usage: { windows: premium },
+      usage: { windows: buildCopilotWindows(payload) },
     });
   } catch (error) {
     return buildResult({