Deny rules silently bypassed because security checks cost too many tokens

Claude Code Security Bypass: How Anthropic’s Performance Fix Silently Disabled Deny Rules for 500K+ Developers

In 1898, cryptographer Auguste Kerckhoffs established a principle that every security professional learns in their first week: a system must remain secure even if everything about it is public knowledge. In 2026, Anthropic — the Multibillion “safety-first” Frontier AI lab currently preparing for an IPO — shipped a product where the entire security model breaks if you type more than 50 commands in a row.

> **Deny rules silently bypassed because security checks cost too many tokens**
>
> Claude Code Security Bypass: How Anthropic’s Performance Fix Silently Disabled Deny Rules for 500K+ Developers
>
> # The Story in 60 Seconds
>
> In 1898, cryptographer Auguste Kerckhoffs established a principle that every security professional learns in their first week: a system must remain secure even if everything about it is public knowledge. In 2026, Anthropic — the Multibillion “safety-first” Frontier AI lab currently preparing for an IPO — shipped a product where the entire security model breaks if you type more than 50 commands in a row.
>
> [**...read more at adversa.ai**](https://adversa.ai/claude-code-security-bypass-deny-rules-disabled/)

The Story in 60 SecondsThe Story in 60 Seconds