diff --git a/src/config/schema.ts b/src/config/schema.ts
index e827a5ce..ed366130 100644
--- a/src/config/schema.ts
+++ b/src/config/schema.ts
@@ -278,8 +278,8 @@ export const RalphLoopConfigSchema = z.object({
 
 export const BackgroundTaskConfigSchema = z.object({
   defaultConcurrency: z.number().min(1).optional(),
-  providerConcurrency: z.record(z.string(), z.number().min(1)).optional(),
-  modelConcurrency: z.record(z.string(), z.number().min(1)).optional(),
+  providerConcurrency: z.record(z.string(), z.number().min(0)).optional(),
+  modelConcurrency: z.record(z.string(), z.number().min(0)).optional(),
   /** Stale timeout in milliseconds - interrupt tasks with no activity for this duration (default: 180000 = 3 minutes, minimum: 60000 = 1 minute) */
   staleTimeoutMs: z.number().min(60000).optional(),
 })