diff --git a/src/cliproxy/quota-fetcher-claude-normalizer.ts b/src/cliproxy/quota-fetcher-claude-normalizer.ts
index 11d8396e..25104425 100644
--- a/src/cliproxy/quota-fetcher-claude-normalizer.ts
+++ b/src/cliproxy/quota-fetcher-claude-normalizer.ts
@@ -7,6 +7,9 @@
 import type { ClaudeCoreUsageSummary, ClaudeQuotaWindow } from './quota-types';
 import { clampPercent } from '../utils/percentage';
 
+// Distinguishes epoch milliseconds from seconds (1e12 ~= 2001-09-09T01:46:40Z).
+const EPOCH_MS_THRESHOLD = 1e12;
+
 function asString(value: unknown): string | null {
   return typeof value === 'string' && value.trim().length > 0 ? value.trim() : null;
 }
@@ -32,7 +35,7 @@ function asNumber(value: unknown): number | null {
 function normalizeTimestamp(value: unknown): string | null {
   const asNum = asNumber(value);
   if (asNum !== null) {
-    const millis = asNum > 1e12 ? asNum : asNum * 1000;
+    const millis = asNum > EPOCH_MS_THRESHOLD ? asNum : asNum * 1000;
     const date = new Date(millis);
     return isNaN(date.getTime()) ? null : date.toISOString();
   }
@@ -44,7 +47,7 @@ function normalizeTimestamp(value: unknown): string | null {
   if (/^\d+$/.test(str)) {
     const numeric = Number(str);
     if (isFinite(numeric)) {
-      const millis = numeric > 1e12 ? numeric : numeric * 1000;
+      const millis = numeric > EPOCH_MS_THRESHOLD ? numeric : numeric * 1000;
       const date = new Date(millis);
       return isNaN(date.getTime()) ? null : date.toISOString();
     }
@@ -260,6 +263,19 @@ const WEEKLY_RATE_LIMIT_TYPES = new Set([
   'seven_day_cowork',
 ]);
 
+export function isClaudeWeeklyRateLimitType(rateLimitType: string): boolean {
+  return WEEKLY_RATE_LIMIT_TYPES.has(rateLimitType);
+}
+
+export function pickMostRestrictiveClaudeWeeklyWindow(
+  windows: ClaudeQuotaWindow[]
+): ClaudeQuotaWindow | null {
+  const weeklyCandidates = windows.filter((window) =>
+    isClaudeWeeklyRateLimitType(window.rateLimitType)
+  );
+  return pickMostRestrictiveWeekly(weeklyCandidates);
+}
+
 /**
  * Build explicit 5h + weekly usage summary from Claude policy windows.
  */
@@ -269,10 +285,7 @@ export function buildClaudeCoreUsageSummary(windows: ClaudeQuotaWindow[]): Claud
   }
 
   const fiveHourWindow = windows.find((window) => window.rateLimitType === 'five_hour') || null;
-  const weeklyCandidates = windows.filter((window) =>
-    WEEKLY_RATE_LIMIT_TYPES.has(window.rateLimitType)
-  );
-  const weeklyWindow = pickMostRestrictiveWeekly(weeklyCandidates);
+  const weeklyWindow = pickMostRestrictiveClaudeWeeklyWindow(windows);
 
   if (fiveHourWindow && weeklyWindow) {
     return {
diff --git a/src/cliproxy/quota-fetcher-claude.ts b/src/cliproxy/quota-fetcher-claude.ts
index 745a5b03..3f0c0aaf 100644
--- a/src/cliproxy/quota-fetcher-claude.ts
+++ b/src/cliproxy/quota-fetcher-claude.ts
@@ -17,7 +17,7 @@ import {
 
 export { buildClaudeQuotaWindows, buildClaudeCoreUsageSummary };
 
-const CLAUDE_POLICY_LIMITS_URL = 'https://api.anthropic.com/api/claude_code/policy_limits';
+export const CLAUDE_POLICY_LIMITS_URL = 'https://api.anthropic.com/api/claude_code/policy_limits';
 const CLAUDE_QUOTA_TIMEOUT_MS = 10000;
 const CLAUDE_QUOTA_MAX_ATTEMPTS = 2;
 const CLAUDE_USER_AGENT = 'ccs-cli/claude-quota';
@@ -61,6 +61,10 @@ function extractExpiry(data: Record<string, unknown>): string | null {
   return null;
 }
 
+function isAuthExpired(expiry: string | null): boolean {
+  return expiry ? isTokenExpired(expiry) : false;
+}
+
 async function readJsonFile(filePath: string): Promise<Record<string, unknown> | null> {
   try {
     const raw = await fsp.readFile(filePath, 'utf-8');
@@ -81,7 +85,7 @@ async function readAuthCandidate(filePath: string): Promise<ClaudeAuthData | nul
   const expiry = extractExpiry(data);
   return {
     accessToken,
-    isExpired: isTokenExpired(expiry ?? undefined),
+    isExpired: isAuthExpired(expiry),
   };
 }
 
@@ -132,7 +136,7 @@ async function readClaudeAuthData(accountId: string): Promise<ClaudeAuthData | n
         const expiry = extractExpiry(data);
         return {
           accessToken,
-          isExpired: isTokenExpired(expiry ?? undefined),
+          isExpired: isAuthExpired(expiry),
         };
       }
     }
@@ -260,7 +264,11 @@ export async function fetchClaudeQuota(
             : 'Unknown error';
 
       if (verbose) {
-        console.error(`[!] Claude policy limits failed (attempt ${attempt}): ${lastError}`);
+        const errorDetails =
+          error instanceof Error ? (error.stack ?? error.message) : JSON.stringify(error);
+        console.error(
+          `[!] Claude policy limits failed (attempt ${attempt}): ${lastError}${errorDetails ? `\n${errorDetails}` : ''}`
+        );
       }
 
       if (attempt >= CLAUDE_QUOTA_MAX_ATTEMPTS) {
diff --git a/src/cliproxy/quota-manager.ts b/src/cliproxy/quota-manager.ts
index d8a4fd78..afb431e8 100644
--- a/src/cliproxy/quota-manager.ts
+++ b/src/cliproxy/quota-manager.ts
@@ -209,10 +209,14 @@ export function clearCooldown(provider: CLIProxyProvider, accountId: string): vo
 async function batchedMap<T, R>(
   items: T[],
   fn: (item: T) => Promise<R>,
-  concurrency = 10
+  concurrency = 10,
+  delayMs = 100
 ): Promise<R[]> {
   const results: R[] = [];
   for (let i = 0; i < items.length; i += concurrency) {
+    if (i > 0 && delayMs > 0) {
+      await new Promise((resolve) => setTimeout(resolve, delayMs));
+    }
     const batch = items.slice(i, i + concurrency);
     const batchResults = await Promise.all(batch.map(fn));
     results.push(...batchResults);
diff --git a/src/commands/cliproxy/quota-subcommand.ts b/src/commands/cliproxy/quota-subcommand.ts
index dfd58dcd..c19dec31 100644
--- a/src/commands/cliproxy/quota-subcommand.ts
+++ b/src/commands/cliproxy/quota-subcommand.ts
@@ -19,6 +19,7 @@ import {
 import { fetchAllProviderQuotas } from '../../cliproxy/quota-fetcher';
 import { fetchAllCodexQuotas } from '../../cliproxy/quota-fetcher-codex';
 import { fetchAllClaudeQuotas } from '../../cliproxy/quota-fetcher-claude';
+import { pickMostRestrictiveClaudeWeeklyWindow } from '../../cliproxy/quota-fetcher-claude-normalizer';
 import { fetchAllGeminiCliQuotas } from '../../cliproxy/quota-fetcher-gemini-cli';
 import { fetchAllGhcpQuotas } from '../../cliproxy/quota-fetcher-ghcp';
 import type {
@@ -438,30 +439,6 @@ function toClaudeCoreDisplayWindow(
   };
 }
 
-function pickClaudeWeeklyWindow(
-  windows: ClaudeQuotaResult['windows']
-): ClaudeQuotaResult['windows'][number] | null {
-  const weeklyCandidates = windows.filter((window) =>
-    [
-      'seven_day',
-      'seven_day_opus',
-      'seven_day_sonnet',
-      'seven_day_oauth_apps',
-      'seven_day_cowork',
-    ].includes(window.rateLimitType)
-  );
-  if (weeklyCandidates.length === 0) return null;
-
-  return [...weeklyCandidates].sort((a, b) => {
-    if (a.remainingPercent !== b.remainingPercent) {
-      return a.remainingPercent - b.remainingPercent;
-    }
-    const aReset = a.resetAt ? new Date(a.resetAt).getTime() : Number.POSITIVE_INFINITY;
-    const bReset = b.resetAt ? new Date(b.resetAt).getTime() : Number.POSITIVE_INFINITY;
-    return aReset - bReset;
-  })[0];
-}
-
 function getClaudeCoreUsageWindows(quota: ClaudeQuotaResult): {
   fiveHourWindow: ClaudeDisplayWindow | null;
   weeklyWindow: ClaudeDisplayWindow | null;
@@ -478,7 +455,7 @@ function getClaudeCoreUsageWindows(quota: ClaudeQuotaResult): {
 
   const fiveHourPolicy =
     quota.windows.find((window) => window.rateLimitType === 'five_hour') ?? null;
-  const weeklyPolicy = pickClaudeWeeklyWindow(quota.windows);
+  const weeklyPolicy = pickMostRestrictiveClaudeWeeklyWindow(quota.windows);
 
   return {
     fiveHourWindow: fiveHourPolicy ? toClaudeDisplayWindow(fiveHourPolicy) : null,
diff --git a/src/web-server/routes/cliproxy-stats-routes.ts b/src/web-server/routes/cliproxy-stats-routes.ts
index 8fd2611e..4d446b90 100644
--- a/src/web-server/routes/cliproxy-stats-routes.ts
+++ b/src/web-server/routes/cliproxy-stats-routes.ts
@@ -54,6 +54,36 @@ import { CLIPROXY_DEFAULT_PORT } from '../../cliproxy/config/port-manager';
 
 const router = Router();
 
+const QUOTA_RATE_LIMIT_WINDOW_MS = 60_000;
+const QUOTA_RATE_LIMIT_MAX_REQUESTS = 120;
+
+interface QuotaRateLimitEntry {
+  windowStart: number;
+  count: number;
+}
+
+const quotaRateLimits = new Map<string, QuotaRateLimitEntry>();
+
+function buildQuotaRateLimitKey(req: Request, provider: string): string {
+  const clientIp = req.ip || req.socket.remoteAddress || 'unknown';
+  return `${clientIp}:${provider}`;
+}
+
+function isQuotaRouteRateLimited(req: Request, provider: string): boolean {
+  const key = buildQuotaRateLimitKey(req, provider);
+  const now = Date.now();
+  const current = quotaRateLimits.get(key);
+
+  if (!current || now - current.windowStart >= QUOTA_RATE_LIMIT_WINDOW_MS) {
+    quotaRateLimits.set(key, { windowStart: now, count: 1 });
+    return false;
+  }
+
+  current.count += 1;
+  quotaRateLimits.set(key, current);
+  return current.count > QUOTA_RATE_LIMIT_MAX_REQUESTS;
+}
+
 /**
  * Cache only stable failures; avoid pinning transient network failures (timeouts, 429s).
  */
@@ -592,6 +622,12 @@ router.put('/models/:provider', async (req: Request, res: Response): Promise<voi
  */
 router.get('/quota/codex/:accountId', async (req: Request, res: Response): Promise<void> => {
   const { accountId } = req.params;
+  if (isQuotaRouteRateLimited(req, 'codex')) {
+    res
+      .status(429)
+      .json({ error: 'Too many quota requests', message: 'Retry after a short delay' });
+    return;
+  }
 
   // Validate accountId - prevent path traversal
   if (
@@ -633,6 +669,12 @@ router.get('/quota/codex/:accountId', async (req: Request, res: Response): Promi
  */
 router.get('/quota/claude/:accountId', async (req: Request, res: Response): Promise<void> => {
   const { accountId } = req.params;
+  if (isQuotaRouteRateLimited(req, 'claude')) {
+    res
+      .status(429)
+      .json({ error: 'Too many quota requests', message: 'Retry after a short delay' });
+    return;
+  }
 
   // Validate accountId - prevent path traversal
   if (
@@ -674,6 +716,12 @@ router.get('/quota/claude/:accountId', async (req: Request, res: Response): Prom
  */
 router.get('/quota/gemini/:accountId', async (req: Request, res: Response): Promise<void> => {
   const { accountId } = req.params;
+  if (isQuotaRouteRateLimited(req, 'gemini')) {
+    res
+      .status(429)
+      .json({ error: 'Too many quota requests', message: 'Retry after a short delay' });
+    return;
+  }
 
   // Validate accountId - prevent path traversal
   if (
@@ -715,6 +763,12 @@ router.get('/quota/gemini/:accountId', async (req: Request, res: Response): Prom
  */
 router.get('/quota/ghcp/:accountId', async (req: Request, res: Response): Promise<void> => {
   const { accountId } = req.params;
+  if (isQuotaRouteRateLimited(req, 'ghcp')) {
+    res
+      .status(429)
+      .json({ error: 'Too many quota requests', message: 'Retry after a short delay' });
+    return;
+  }
 
   // Validate accountId - prevent path traversal
   if (
@@ -757,6 +811,12 @@ router.get('/quota/ghcp/:accountId', async (req: Request, res: Response): Promis
  */
 router.get('/quota/:provider/:accountId', async (req: Request, res: Response): Promise<void> => {
   const { provider, accountId } = req.params;
+  if (isQuotaRouteRateLimited(req, provider)) {
+    res
+      .status(429)
+      .json({ error: 'Too many quota requests', message: 'Retry after a short delay' });
+    return;
+  }
 
   // Validate provider - use canonical CLIPROXY_PROFILES
   const validProviders: CLIProxyProvider[] = [...CLIPROXY_PROFILES];
diff --git a/tests/unit/cliproxy/quota-fetcher-claude.test.ts b/tests/unit/cliproxy/quota-fetcher-claude.test.ts
index 40cbcdef..dd197288 100644
--- a/tests/unit/cliproxy/quota-fetcher-claude.test.ts
+++ b/tests/unit/cliproxy/quota-fetcher-claude.test.ts
@@ -377,6 +377,27 @@ describe('Claude Quota Fetcher', () => {
       expect(fetchMock).toHaveBeenCalledTimes(0);
     });
 
+    it('treats missing expiry as not expired', async () => {
+      createClaudeAccount('claude-no-expiry@example.com', {
+        access_token: 'no-expiry-token',
+        type: 'claude',
+      });
+
+      global.fetch = mock(() =>
+        Promise.resolve(
+          new Response(JSON.stringify({ restrictions: [] }), {
+            status: 200,
+            headers: { 'Content-Type': 'application/json' },
+          })
+        )
+      ) as typeof fetch;
+
+      const result = await fetchClaudeQuota('claude-no-expiry@example.com');
+
+      expect(result.success).toBe(true);
+      expect(result.windows).toHaveLength(0);
+    });
+
     it('retries once on transient 500 then succeeds', async () => {
       createClaudeAccount('claude-retry@example.com', {
         access_token: 'retry-token',
diff --git a/ui/src/components/account/flow-viz/account-card.tsx b/ui/src/components/account/flow-viz/account-card.tsx
index 4bf4abc5..f3410a91 100644
--- a/ui/src/components/account/flow-viz/account-card.tsx
+++ b/ui/src/components/account/flow-viz/account-card.tsx
@@ -315,7 +315,7 @@ export function AccountCard({
                   </div>
                 </TooltipTrigger>
                 <TooltipContent side="top" className="max-w-xs">
-                  {quota && <QuotaTooltipContent quota={quota} resetTime={resetTime} />}
+                  <QuotaTooltipContent quota={quota} resetTime={resetTime} />
                 </TooltipContent>
               </Tooltip>
             </TooltipProvider>
diff --git a/ui/src/components/cliproxy/provider-editor/account-item.tsx b/ui/src/components/cliproxy/provider-editor/account-item.tsx
index fd95e5fe..501fc4c3 100644
--- a/ui/src/components/cliproxy/provider-editor/account-item.tsx
+++ b/ui/src/components/cliproxy/provider-editor/account-item.tsx
@@ -424,7 +424,7 @@ export function AccountItem({
                     )}
                   </TooltipTrigger>
                   <TooltipContent side="bottom" className="max-w-xs">
-                    {quota && <QuotaTooltipContent quota={quota} resetTime={nextReset} />}
+                    <QuotaTooltipContent quota={quota} resetTime={nextReset} />
                   </TooltipContent>
                 </Tooltip>
               </TooltipProvider>
diff --git a/ui/src/components/shared/quota-tooltip-content.tsx b/ui/src/components/shared/quota-tooltip-content.tsx
index 4dbac2d6..d95dab71 100644
--- a/ui/src/components/shared/quota-tooltip-content.tsx
+++ b/ui/src/components/shared/quota-tooltip-content.tsx
@@ -22,7 +22,7 @@ import {
 } from '@/lib/utils';
 
 interface QuotaTooltipContentProps {
-  quota: UnifiedQuotaResult;
+  quota: UnifiedQuotaResult | null | undefined;
   resetTime: string | null;
 }
 
@@ -62,7 +62,13 @@ function getClaudeWindowDisplayLabel(rateLimitType: string, fallback: string): s
  * Uses type guards for proper TypeScript narrowing
  */
 export function QuotaTooltipContent({ quota, resetTime }: QuotaTooltipContentProps) {
-  if (!quota?.success) return null;
+  if (!quota) {
+    return <p className="text-xs text-muted-foreground">Loading quota...</p>;
+  }
+
+  if (!quota.success) {
+    return <p className="text-xs text-destructive">{quota.error || 'Failed to load quota'}</p>;
+  }
 
   // Antigravity (agy) provider tooltip
   if (isAgyQuotaResult(quota)) {
diff --git a/ui/src/lib/utils.ts b/ui/src/lib/utils.ts
index 56007a4b..1fbbe124 100644
--- a/ui/src/lib/utils.ts
+++ b/ui/src/lib/utils.ts
@@ -618,45 +618,97 @@ export type UnifiedQuotaResult =
   | GeminiCliQuotaResult
   | GhcpQuotaResult;
 
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === 'object' && value !== null;
+}
+
+function isFiniteNumber(value: unknown): value is number {
+  return typeof value === 'number' && Number.isFinite(value);
+}
+
 /** Type guard: Check if quota result is from Antigravity (agy) provider */
 export function isAgyQuotaResult(quota: UnifiedQuotaResult): quota is QuotaResult {
-  return 'models' in quota && Array.isArray((quota as QuotaResult).models);
+  if (!isRecord(quota)) return false;
+  const models = (quota as Partial<QuotaResult>).models;
+  return typeof quota.success === 'boolean' && Array.isArray(models);
 }
 
 /** Type guard: Check if quota result is from Codex provider */
 export function isCodexQuotaResult(quota: UnifiedQuotaResult): quota is CodexQuotaResult {
-  return (
-    'windows' in quota && 'planType' in quota && Array.isArray((quota as CodexQuotaResult).windows)
+  if (!isRecord(quota)) return false;
+
+  const candidate = quota as Partial<CodexQuotaResult>;
+  if (typeof candidate.success !== 'boolean') return false;
+  if (!Array.isArray(candidate.windows)) return false;
+  if (!('planType' in candidate)) return false;
+
+  return candidate.windows.every(
+    (window) =>
+      isRecord(window) &&
+      typeof window.label === 'string' &&
+      isFiniteNumber(window.usedPercent) &&
+      isFiniteNumber(window.remainingPercent)
   );
 }
 
 /** Type guard: Check if quota result is from Claude provider */
 export function isClaudeQuotaResult(quota: UnifiedQuotaResult): quota is ClaudeQuotaResult {
-  return (
-    'windows' in quota &&
-    !('planType' in quota) &&
-    Array.isArray((quota as ClaudeQuotaResult).windows)
+  if (!isRecord(quota)) return false;
+
+  const candidate = quota as Partial<ClaudeQuotaResult>;
+  if (typeof candidate.success !== 'boolean') return false;
+  if (!Array.isArray(candidate.windows)) return false;
+  if ('planType' in candidate) return false;
+
+  return candidate.windows.every(
+    (window) =>
+      isRecord(window) &&
+      typeof window.rateLimitType === 'string' &&
+      isFiniteNumber(window.remainingPercent) &&
+      typeof window.status === 'string'
   );
 }
 
 /** Type guard: Check if quota result is from Gemini CLI provider */
 export function isGeminiQuotaResult(quota: UnifiedQuotaResult): quota is GeminiCliQuotaResult {
-  return 'buckets' in quota && Array.isArray((quota as GeminiCliQuotaResult).buckets);
+  if (!isRecord(quota)) return false;
+
+  const candidate = quota as Partial<GeminiCliQuotaResult>;
+  if (typeof candidate.success !== 'boolean') return false;
+  if (!Array.isArray(candidate.buckets)) return false;
+
+  return candidate.buckets.every(
+    (bucket) =>
+      isRecord(bucket) &&
+      typeof bucket.id === 'string' &&
+      isFiniteNumber(bucket.remainingFraction) &&
+      isFiniteNumber(bucket.remainingPercent) &&
+      Array.isArray(bucket.modelIds)
+  );
 }
 
 /** Type guard: Check if quota result is from GitHub Copilot (ghcp) provider */
 export function isGhcpQuotaResult(quota: UnifiedQuotaResult): quota is GhcpQuotaResult {
-  const candidate = quota as GhcpQuotaResult;
-  const snapshots = candidate.snapshots as Record<string, unknown> | null | undefined;
+  if (!isRecord(quota)) return false;
 
-  return (
-    'snapshots' in quota &&
-    typeof snapshots === 'object' &&
-    snapshots !== null &&
-    'premiumInteractions' in snapshots &&
-    'chat' in snapshots &&
-    'completions' in snapshots
-  );
+  const candidate = quota as Partial<GhcpQuotaResult>;
+  const snapshots = candidate.snapshots as Record<string, unknown> | null | undefined;
+  if (typeof candidate.success !== 'boolean') return false;
+  if (!isRecord(snapshots)) return false;
+
+  const snapshotKeys: Array<keyof GhcpQuotaResult['snapshots']> = [
+    'premiumInteractions',
+    'chat',
+    'completions',
+  ];
+  return snapshotKeys.every((key) => {
+    const snapshot = snapshots[key] as Record<string, unknown> | undefined;
+    return (
+      isRecord(snapshot) &&
+      isFiniteNumber(snapshot.percentRemaining) &&
+      isFiniteNumber(snapshot.percentUsed)
+    );
+  });
 }
 
 // ==================== Unified Quota Helpers ====================
diff --git a/ui/tests/unit/ui/lib/quota-utils.test.ts b/ui/tests/unit/ui/lib/quota-utils.test.ts
index d6c9dcd2..62865580 100644
--- a/ui/tests/unit/ui/lib/quota-utils.test.ts
+++ b/ui/tests/unit/ui/lib/quota-utils.test.ts
@@ -15,6 +15,7 @@ import {
   getProviderMinQuota,
   getProviderResetTime,
   isAgyQuotaResult,
+  isClaudeQuotaResult,
   isCodexQuotaResult,
   isGeminiQuotaResult,
   isGhcpQuotaResult,
@@ -22,6 +23,7 @@ import {
 import type {
   CodexQuotaWindow,
   CodexQuotaResult,
+  ClaudeQuotaResult,
   GeminiCliBucket,
   GeminiCliQuotaResult,
   GhcpQuotaResult,
@@ -1002,6 +1004,56 @@ describe('isCodexQuotaResult', () => {
   });
 });
 
+describe('isClaudeQuotaResult', () => {
+  it('returns true for valid Claude quota result', () => {
+    const quota: ClaudeQuotaResult = {
+      success: true,
+      windows: [
+        {
+          rateLimitType: 'five_hour',
+          label: 'Session limit',
+          status: 'allowed',
+          utilization: 0.5,
+          usedPercent: 50,
+          remainingPercent: 50,
+          resetAt: '2026-01-30T12:00:00Z',
+        },
+      ],
+      coreUsage: {
+        fiveHour: {
+          rateLimitType: 'five_hour',
+          label: 'Session limit',
+          remainingPercent: 50,
+          resetAt: '2026-01-30T12:00:00Z',
+          status: 'allowed',
+        },
+        weekly: null,
+      },
+      lastUpdated: Date.now(),
+    };
+    expect(isClaudeQuotaResult(quota)).toBe(true);
+  });
+
+  it('returns false for Codex quota result', () => {
+    const quota: CodexQuotaResult = {
+      success: true,
+      windows: [],
+      planType: 'free',
+      lastUpdated: Date.now(),
+    };
+    expect(isClaudeQuotaResult(quota as unknown as ClaudeQuotaResult)).toBe(false);
+  });
+
+  it('returns false when Claude windows are malformed', () => {
+    const malformed = {
+      success: true,
+      windows: [{ rateLimitType: 'five_hour', label: 'Session limit' }],
+      lastUpdated: Date.now(),
+    };
+    expect(isClaudeQuotaResult(malformed as unknown as ClaudeQuotaResult)).toBe(false);
+  });
+});
+
 describe('isGeminiQuotaResult', () => {
   it('returns true for valid Gemini quota result', () => {
     const quota: GeminiCliQuotaResult = {