fix(security): improve API key detection patterns to prevent false positives

- Change from substring to pattern-based matching for sensitive keys
- Prevents ANTHROPIC_MAX_TOKENS from being incorrectly censored
- Synchronize backend and UI detection logic for consistency

src/web-server/routes.ts

@@ -478,10 +478,17 @@ function maskApiKeys(settings: Settings): Settings {
   if (!settings.env) return settings;
 
   const masked = { ...settings, env: { ...settings.env } };
-  const sensitiveKeys = ['ANTHROPIC_AUTH_TOKEN', 'API_KEY', 'AUTH_TOKEN'];
+  // Pattern-based matching for sensitive keys
+  const sensitivePatterns = [
+    /^ANTHROPIC_AUTH_TOKEN$/, // Exact match for Anthropic auth token
+    /_API_KEY$/, // Keys ending with _API_KEY
+    /_AUTH_TOKEN$/, // Keys ending with _AUTH_TOKEN
+    /^API_KEY$/, // Exact match for API_KEY
+    /^AUTH_TOKEN$/, // Exact match for AUTH_TOKEN
+  ];
 
   for (const key of Object.keys(masked.env)) {
-    if (sensitiveKeys.some((sensitive) => key.includes(sensitive))) {
+    if (sensitivePatterns.some((pattern) => pattern.test(key))) {
       const value = masked.env[key];
       if (value && value.length > 8) {
         masked.env[key] =

ui/src/components/settings-dialog.tsx

@@ -145,7 +145,17 @@ function SettingsDialogContent({
   };
 
   const isSensitiveKey = (key: string): boolean => {
-    return key.includes('TOKEN') || key.includes('KEY') || key.includes('SECRET');
+    // Pattern-based matching for sensitive keys (same as backend)
+    const sensitivePatterns = [
+      /^ANTHROPIC_AUTH_TOKEN$/, // Exact match for Anthropic auth token
+      /_API_KEY$/, // Keys ending with _API_KEY
+      /_AUTH_TOKEN$/, // Keys ending with _AUTH_TOKEN
+      /^API_KEY$/, // Exact match for API_KEY
+      /^AUTH_TOKEN$/, // Exact match for AUTH_TOKEN
+      /_SECRET$/, // Keys ending with _SECRET
+      /^SECRET$/, // Exact match for SECRET
+    ];
+    return sensitivePatterns.some((pattern) => pattern.test(key));
   };
 
   return (