---
title: "Tim Brewer (@cinq) | Hashnode"
description: "Tim Brewer (@cinq) writes on Hashnode. Read their latest articles and follow their work."
url: "https://hashnode.com/@cinq"
---

@cinq

# Tim Brewer

@cinq · Austin, USA · Joined November 2026

### [Deterministic Firewalls for AI Agents: Enforcing Boundaries Before Tools Execute](https://tech.timbrewer.info/deterministic-firewalls-for-ai-agents-enforcing-boundaries-before-tools-execute?utm_source=hashnode&utm_medium=feed)

How explicit policies can limit what an AI agent is allowed to do—even when its reasoning goes wrong. An AI support agent reads a customer ticket, checks an order, and proposes a refund. Now imagine t

6 min read · [tech.timbrewer.info](https://tech.timbrewer.info/deterministic-firewalls-for-ai-agents-enforcing-boundaries-before-tools-execute?utm_source=hashnode&utm_medium=feed)

[47m ago](https://hashnode.com/posts/deterministic-firewalls-for-ai-agents-enforcing-boundaries-before-tools-execute/6af4c8e74a4eaa8d7b79e7f9)