Boundary Leakage

Kind: anti-pattern

Layer: Enforcement Core

Record: architecture:boundary-leakage

Severity: discouraged

Scope: modularity, model_governance

Formed by: Permit internal models, infrastructure types, persistence structures, or private module APIs to cross intended architectural boundaries.

Canonical: Ontology

A defect in which internal, persistence or vendor types cross an architectural boundary.

Listed in Architecture principles, after Shared Mutable State and before Manual-Only Governance.

Refactored by

• Restrict Exports
• Introduce Boundary DTO
• Extract Adapter
• Facade Pattern
• Architecture Test

Severity

• discouraged

Category

• Anti-patterns

Force

• Model governance
• Modularity

Detected by

• codemods/entrypoints/specifier.entrypoint.ts
• rules/eslint/closure-no-cross-member-relative.eslint.rule.ts
• rules/eslint/closure-no-platform-product-import.eslint.rule.ts

Negated by

• Explicit Boundaries

Violates

• Explicit Boundaries
• Modularity

Linked from

• Principles are typed
• Seven controls, seven classes
• Anti-patterns
• Domain Architecture
• Core Modular Design
• Architecture Review Evolution Governance
• Codebase / System Architecture Styles
• Contracts / Interfaces / Compatibility
• Core Modular Design
• Severity levels
• The forces