npx wrangler queues consumer add my-queue my-worker --batch-size 10 --message-retries 3

Adds the consumer with batches of up to 10 messages and 3 retries per message before it is considered failed, tuning throughput and reliability together. A failed message can be routed to a dead-letter queue via --dead-letter-queue instead of being dropped. Adjust retries carefully: too many delays processing.