01 / DECISION
When this primitive earns a place
Use a queue when producers should finish without waiting for a slower or failure-prone consumer.
02 / ARCHITECTURE
Build the smallest defensible path
Define a versioned message schema and idempotency key, bound retries, isolate poison messages, and monitor age plus throughput.
- 01Name the contract
Use a queue when producers should finish without waiting for a slower or failure-prone consumer.
- 02Add one primitive
Define a versioned message schema and idempotency key, bound retries, isolate poison messages, and monitor age plus throughput.
- 03Capture failure evidence
Send duplicates and malformed messages, force a consumer failure, and prove retries, deduplication, and dead-letter recovery.
03 / REPRODUCE
Evidence before confidence
Send duplicates and malformed messages, force a consumer failure, and prove retries, deduplication, and dead-letter recovery.
npx wrangler queues list04 / BOUNDARY
The production boundary
At-least-once delivery means duplicates are normal. A queue hides latency unless lag and terminal failure are observable.
05 / FIRST-PARTY SOURCES
Keep first-party sources authoritative
Product behavior, limits, pricing, and availability can change. Re-check these sources before acting.