# External State Mutation

> Mutating state outside an object's own boundary, breaking the invariants it is supposed to guarantee.

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

## category

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

## referenced-by

- [Invariants](https://banes-lab.com/records/arch/invariants.md)