# Tool Interface

> The defined contract through which an agent invokes external tools and receives their results.

Record: `lex:tool-interface`
Kind: constraint
Layer: [Correctness Core](https://banes-lab.com/records/layer/correctness-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lex-tool-interface

## category

- [Model Architecture](https://banes-lab.com/records/lex-category/model-architecture.md)

## referenced-by

- [Agentic Architecture](https://banes-lab.com/records/arch/agentic-architecture.md)