Amazon SQS API
Amazon Simple Queue Service (SQS) is a fully managed message queuing service offering standard (at-least-once) and FIFO (exactly-once, ordered) queues with dead-letter queue support for reliable async task processing.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
IAM fine-grained access control per queue and per action. SSE with AWS KMS for encryption at rest. VPC endpoints available for private connectivity without internet traversal. Resource-based queue policies for cross-account access.
⚡ Reliability
Best When
An agent needs reliable, durable task queuing with built-in retry semantics, dead-letter handling, and the ability to control processing rate within AWS infrastructure.
Avoid When
You need broadcast semantics where the same message must be consumed by multiple independent subscribers without explicit routing.
Use Cases
- • Queuing agent tasks for asynchronous processing with automatic retry and backoff via visibility timeout
- • Implementing FIFO task queues to ensure ordered, exactly-once processing in multi-agent pipelines
- • Routing failed agent tasks to dead-letter queues for inspection, reprocessing, or alerting
- • Decoupling producer agents from consumer agents to allow independent scaling and failure isolation
- • Buffering bursts of work from upstream agents so downstream processors can consume at a sustainable rate
Not For
- • Pub/sub fan-out to multiple consumers simultaneously (use SNS for that pattern)
- • Message retention longer than 14 days without external archival
- • Real-time streaming where consumers need sub-millisecond latency
Interface
Authentication
AWS Signature Version 4 authentication via IAM. Fine-grained IAM policies control actions per queue ARN (sqs:SendMessage, sqs:ReceiveMessage, sqs:DeleteMessage). IAM roles eliminate credential management for EC2/ECS/Lambda agents.
Pricing
Costs are very low for most agent workloads. A single 64KB payload counts as one request; larger payloads (up to 256KB) are billed in 64KB chunks.
Agent Metadata
Known Gotchas
- ⚠ Visibility timeout must be set longer than the maximum expected processing time; expiring before deletion causes redelivery and duplicate processing
- ⚠ ReceiveMessage returns at most 10 messages per call; agents must loop to drain a queue, adding latency for high-volume scenarios
- ⚠ Long polling (WaitTimeSeconds > 0) is strongly recommended to reduce empty receives and costs, but requires client-side timeout handling
- ⚠ FIFO queue throughput limits (300-3000 TPS) can bottleneck high-throughput agents; horizontal scaling requires multiple message group IDs
- ⚠ Message attribute type system is limited (String, Number, Binary); complex structured payloads should be serialized to String and parsed by consumers
Alternatives
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Scores are editorial opinions as of 2026-03-07.