# Event and Messaging Consistency

> For asynchronous systems, validate event contracts, message schemas, idempotent consumers, outbox publication, correlation metadata, ordering guarantees, retry behavior, and dead-letter handling.

Record: `algorithms:event-and-messaging-consistency`
Kind: algorithm
Canonical: https://banes-lab.com/ontology/algorithms#algorithms-event-and-messaging-consistency
Closure: https://banes-lab.com/json/records/algorithms/event-and-messaging-consistency/closure

Listed in [Algorithm contracts](https://banes-lab.com/api/records/algorithms.md), after [Pattern Selection](https://banes-lab.com/records/algorithms/pattern-selection.md) and before [State and Transaction Safety](https://banes-lab.com/records/algorithms/state-and-transaction-safety.md).

## Domain

- [Architecture relationships](https://banes-lab.com/records/algorithms-domain/arch-relationships.md)

## Tier

- [leaf](https://banes-lab.com/records/vocabulary/domain-tier-leaf.md)

## Composes

- [Observability Trace](https://banes-lab.com/records/algorithms/observability-trace.md)

## Math type

- [Logic](https://banes-lab.com/records/reasoning/math-type-logic.md)

## Force

- [Causality ordering](https://banes-lab.com/records/force/causality-ordering.md)
- [Contract compatibility](https://banes-lab.com/records/force/contract-compatibility.md)
- [Correctness verification](https://banes-lab.com/records/force/correctness-verification.md)
- [Event messaging](https://banes-lab.com/records/force/event-messaging.md)
- [Observability traceability](https://banes-lab.com/records/force/observability-traceability.md)
- [Resilience recovery](https://banes-lab.com/records/force/resilience-recovery.md)
- [State transaction](https://banes-lab.com/records/force/state-transaction.md)

## Linked from

- [Architecture](https://banes-lab.com/ontology/algorithms/algorithms-domain-architecture.md)
- [The mathematics](https://banes-lab.com/ontology/reasoning/the-mathematics.md)
- [Domain tiers](https://banes-lab.com/ontology/schema/the-vocabulary-domain-tier.md)
- [The forces](https://banes-lab.com/ontology/schema/the-forces.md)