# Hidden Service Coupling

> An undeclared dependency between services that surfaces only at runtime, undermining independent evolution.

Record: `lexicon:hidden-service-coupling`
Kind: anti-pattern
Layer: [Contracts Core](https://banes-lab.com/records/layer/contracts-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-hidden-service-coupling

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [External State Mutation](https://banes-lab.com/records/lexicon/external-state-mutation.md) and before [Implementation-First Integration](https://banes-lab.com/records/lexicon/implementation-first-integration.md).

## Category

- [Contracts / Interfaces / Compatibility](https://banes-lab.com/records/lexicon-category/contracts-interfaces-compatibility.md)

## Negated by

- [Service Contract](https://banes-lab.com/records/architecture/service-contract.md)

## Linked from

- [Contracts / Interfaces / Compatibility](https://banes-lab.com/ontology/principles/architecture-category-contracts-interfaces-compatibility.md)