Exit Code 2: How Claude Hooks Turn Agentic Rules Into Runtime Barriers

This article was originally published on EthereaLogic.ai . The first article in this series introduced the five-layer governance stack and made a single load-bearing claim: the layers that live in documents are necessary, and the layers that run as code are what make the system trustworthy. This article goes inside the highest-leverage code layer — runtime enforcement via Claude Hooks — and shows what one looks like at the level of detail an engineering team would actually need to build it. The