# Timeout Pattern

> A design pattern that gives every external call a time budget and fails the call when the budget runs out.

Record: `architecture:timeout-pattern`
Kind: pattern
Layer: [Correctness Core](https://banes-lab.com/records/layer/correctness-core.md)
Severity: mandatory
Scope: network, IO, dependency call
Canonical: https://banes-lab.com/ontology#architecture-timeout-pattern

Listed in [Architecture principles](https://banes-lab.com/api/records/architecture.md), after [Retry Pattern](https://banes-lab.com/records/architecture/retry-pattern.md) and before [Circuit Breaker Pattern](https://banes-lab.com/records/architecture/circuit-breaker-pattern.md).

## Repair

- Refactored by: Add Timeout, Propagate Deadline
- Detected by: missing timeout config
- Violated by: external calls without timeout
- Measured by: timeout coverage, latency tail
- Enforced by: lint/config checks

## Requires

- [Time Budget](https://banes-lab.com/records/lexicon/time-budget.md)

## Reinforces

- [Fault Isolation](https://banes-lab.com/records/lexicon/fault-isolation.md)

## Enables

- [Bounded Waiting](https://banes-lab.com/records/lexicon/bounded-waiting.md)

## Conflicts with

- [Timeout Omission](https://banes-lab.com/records/architecture/timeout-omission.md)

## In tension with

- [Slow Operation Tolerance](https://banes-lab.com/records/lexicon/slow-operation-tolerance.md)

## Tensions

- [Timeout Pattern / Slow Operation Tolerance](https://banes-lab.com/records/tension/slow-operation-tolerance-timeout-pattern.md)

## Severity

- [mandatory](https://banes-lab.com/records/vocabulary/severity-mandatory.md)

## Category

- [Error Handling / Resilience](https://banes-lab.com/records/architecture-category/error-handling-resilience.md)

## Linked from

- [Posting and waiting are one operation](https://banes-lab.com/disciplined-methodology/collaborate/posting-and-waiting-are-one-operation.md)
- [Anti-patterns](https://banes-lab.com/ontology/principles/architecture-category-anti-patterns.md)
- [Core Vocabulary](https://banes-lab.com/ontology/lexicon/lexicon-category-core-vocabulary.md)
- [Error Handling / Resilience](https://banes-lab.com/ontology/lexicon/lexicon-category-error-handling-resilience.md)
- [Quality Attributes](https://banes-lab.com/ontology/lexicon/lexicon-category-quality-attributes.md)
- [Severity levels](https://banes-lab.com/ontology/schema/the-vocabulary-severity.md)
- [The resolutions](https://banes-lab.com/ontology/schema/the-resolutions.md)