Symfony Scheduler (Symfony)

Use when

• Implementing asynchronous workflows with Messenger/Scheduler/Cache.

• Stabilizing retries and failure transports.

Default workflow

• Define async contract and delivery semantics.

• Implement idempotent handlers and routing strategy.

• Configure retries, failure transport, and observability.

• Validate success/failure replay scenarios.

Guardrails

• Assume at-least-once delivery, not exactly-once.

• Keep handlers deterministic and side-effect aware.

• Surface poison-message handling strategy.

Progressive disclosure

• Use this file for execution posture and risk controls.

• Open references when deep implementation details are needed.

Output contract

• Async config/handlers updated.

• Retry/failure policy decisions.

• Operational validation evidence.

References

• reference.md

• docs/complexity-tiers.md