---
title: "What breaks first, and at what scale?"
description: "Model a workload, identify its first declared capacity constraint, and export an inspectable Fanout Scale decision receipt."
canonical_url: "https://fanout.sh/labs/back-of-the-envelope"
md_url: "https://fanout.sh/labs/back-of-the-envelope.md"
access: "public"
---

# What breaks first, and at what scale?

Model a workload, identify its first declared capacity constraint, and export an inspectable Fanout Scale decision receipt.

---
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