System Design Simple

@SysDesignSimple

How big apps really work, explained simply with diagrams. System design, AI coding tools (Claude, Codex) and web security. New short video + article every week.

systemdesignsimple.com

Joined August 2025

75 Following

11 Followers

Replies Reposts Media

System Design Simple
@SysDesignSimple
8h
Summarize this page, you say. In our simulation (a toy model on one Mac, defence strengths set by us), a hidden line steered 109 of 200 summaries; marking the page as data plus a rule cut it to 28, and only removing the email too… #PromptInjection #AISystems #SystemDesign
System Design Simple
@SysDesignSimple
12h
How to create an AI agent skill: one SKILL.md, reused by two agents An AI agent skill is a folder holding a SKILL.md file: front matter with a name and a description, then plain instructions. The agent reads only the description until a… systemdesignsimple.com/how-to-create-… #SystemDesign
1
System Design Simple
@SysDesignSimple
12h
How to check WordPress for CVE-2026-119977: the version, the auto-update blockers and the upgrade folder CVE-2026-119977 is a race in WordPress full-package core upgrades. Affected branches start at 4.7; releases below each branch's… systemdesignsimple.com/wordpress-core… #SystemDesign
System Design Simple
@SysDesignSimple
12h
How to check Rails image uploads and lock down ImageMagick (GHSA-f3w6-w445-fwh9) Per Rails advisory GHSA-f3w6-w445-fwh9, Active Storage apps that analyze untrusted uploads with ImageMagick can allow server file writes. Upgrade… systemdesignsimple.com/rails-imagemag… #SystemDesign
System Design Simple
@SysDesignSimple
12h
Alpine and musl sshd without PAM: check for the OpenSSH 10.6p2 password bypass and fix it OpenSSH below 10.6p2 on musl Linux (Alpine) with PAM off can accept any password of 257 to 1024 bytes for accounts whose shadow field is *, such as… systemdesignsimple.com/openssh-long-p… #SystemDesign

System Design Simple

System Design Simple’s posts