Azure Service Bus
Azure's enterprise message broker with queues and topics/subscriptions for reliable async communication, dead-letter queues, and session-based ordering.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Managed Identity with RBAC is recommended. SAS keys should be rotated; use minimum-privilege send/listen permissions.
⚡ Reliability
Best When
You need enterprise messaging guarantees (exactly-once, sessions, dead-letter) in Azure-native workflows connecting multiple agent services.
Avoid When
You need millions of events/second streaming (Event Hubs) or simple webhooks (Event Grid).
Use Cases
- • Decoupling agent task producers from consumers with guaranteed delivery queues
- • Fan-out message distribution using topics with multiple subscriptions and filter rules
- • Session-based ordered processing for workflows requiring FIFO guarantee per entity
- • Dead-letter queue processing to catch and retry failed agent task messages
- • Scheduled message delivery for deferred agent task execution
Not For
- • High-throughput event streaming (use Azure Event Hubs or Kafka instead)
- • Simple pub/sub without ordering requirements (use Azure Event Grid)
- • Teams outside Azure ecosystem (use AWS SQS/SNS or RabbitMQ)
Interface
Authentication
Shared Access Signature (SAS) for quick setup; Azure AD with Managed Identity for production. Connection strings embed SAS key — avoid in code.
Pricing
Premium tier required for sessions, transactions, and high throughput. Message size limits: 256KB (Standard), 100MB (Premium).
Agent Metadata
Known Gotchas
- ⚠ Peek-lock must be completed/abandoned/dead-lettered within lock duration — agents must renew lock on long processing
- ⚠ Sessions must be explicitly accepted by session-aware receivers — regular receivers cannot process session messages
- ⚠ Topics require Standard or Premium tier — Basic tier only supports queues; check tier before topic operations
- ⚠ Message lock renewal must happen before expiry; calculate processing time and add buffer or implement auto-renewal
- ⚠ Connection strings in code are a security risk — use DefaultAzureCredential with Managed Identity in production
Alternatives
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Scores are editorial opinions as of 2026-03-07.