diff --git a/src/web/schemas.ts b/src/web/schemas.ts
index 87629d1e..bdc964f6 100644
--- a/src/web/schemas.ts
+++ b/src/web/schemas.ts
@@ -267,6 +267,7 @@ export const SettingsUpdateSchema = z
     tunnelEnabled: z.boolean().optional(),
     tabTwoRows: z.boolean().optional(),
     agentTeamsEnabled: z.boolean().optional(),
+    thinkingEffort: z.string().max(20).optional(),
     // UI visibility
     showFontControls: z.boolean().optional(),
     showSystemStats: z.boolean().optional(),