# Vendor Lock-In Leakage

> A defect in which an external system's or a vendor's APIs, errors and models spread through application and domain code, so their changes ripple across it.

Record: `architecture:vendor-lock-in-leakage`
Kind: anti-pattern
Layer: [Enforcement Core](https://banes-lab.com/records/layer/enforcement-core.md)
Severity: discouraged
Scope: modularity, model_governance, domain_boundary
Aliases: Shared Model Coupling
Canonical: https://banes-lab.com/ontology#architecture-vendor-lock-in-leakage

Listed in [Architecture principles](https://banes-lab.com/api/records/architecture.md), after [Framework Leakage](https://banes-lab.com/records/architecture/framework-leakage.md) and before [Circular Dependency](https://banes-lab.com/records/architecture/circular-dependency.md).

## Repair

- Refactored by: extract_vendor_adapter, define_port, translate_errors, own_canonical_model
- Detected by: vendor_imports_outside_adapter, vendor_error_types_in_domain, vendor_schema_as_canonical_model
- Violated by: Spread vendor-specific APIs, models, exceptions, identifiers, or configuration throughout application and domain code.
- Measured by: vendor imports outside adapters
- Enforced by: import rules that confine vendor packages to adapters

## Severity

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

## Category

- [Anti-patterns](https://banes-lab.com/records/architecture-category/anti-patterns.md)

## Force

- [Domain boundary](https://banes-lab.com/records/force/domain-boundary.md)
- [Model governance](https://banes-lab.com/records/force/model-governance.md)
- [Modularity](https://banes-lab.com/records/force/modularity.md)

## Negated by

- [Anti-Corruption Layer](https://banes-lab.com/records/architecture/anti-corruption-layer.md)

## Linked from

- [Semantic operations](https://banes-lab.com/pag/guide/tool-invocation.md)
- [Anti-patterns](https://banes-lab.com/ontology/principles/architecture-category-anti-patterns.md)
- [Domain Architecture](https://banes-lab.com/ontology/principles/architecture-category-domain-architecture.md)
- [Severity levels](https://banes-lab.com/ontology/schema/the-vocabulary-severity.md)
- [The forces](https://banes-lab.com/ontology/schema/the-forces.md)