System Design Skills plugin for Codex

CommunityPluginCreativity

A divide-and-conquer wiki of system-design skills. Reason about a design problem one part at a time -- requirements, capacity, APIs, storage, caching, load balancing, messaging, consistency, resilience, delivery, and scaling -- each with generic recipes, cloud-provider variants (AWS/Azure/GCP/Temporal), explicit trade-offs, and failure-mode analysis. Optimizes for reasoning over memorized architectures.

How to install System Design Skills in Codex

✓ Install-checked in Codexchecked Oct 29, 2026 · 22 skills proof

1. Add the repo as a Codex plugin marketplace:

codex plugin marketplace add proyecto26/system-design-skills

2. Install the plugin from it:

codex plugin add system-design-skills@system-design-skills-marketplace

This repo ships a Codex marketplace file (.agents/plugins/marketplace.json). The first command adds it as a marketplace (Codex CLI reference); the second installs the plugin 'system-design-skills'. 'system-design-skills-marketplace' is the marketplace name from that file. Check the repo README too. Command format: Codex CLI reference.

What it contains

Plugins in this marketplace (1)

system-design-skills — A divide-and-conquer wiki of system-design skills. Reason about a design problem one part at a time -- requirements, capacity, APIs, storage, caching, load balancing, messaging, consistency, resilience, delivery, and scaling -- each with generic recipes…

Example prompts from the manifest

Use the system-design skill to design a URL shortener for 10k writes/sec
Estimate storage and QPS for a chat app with 50M daily users
Should we cache this read-heavy endpoint? Walk me through the trade-offs

About this listing

System Design Skills is a community plugin on GitHub by proyecto26. Its README documents a Codex install and the repo ships a Codex plugin manifest. It passed the CodexStacks quality filter for repos found this way (at least 100 stars, pushed in the last 90 days, not a fork or a list). OpenAI hasn't reviewed it, but it passed our Codex install check on Oct 29, 2026 (an install and load check, not a code review). From its files we found 1 plugin. The manifest says version 0.1.0. It's one of 137 listings in the Creativity category (category assigned by CodexStacks from the repo's topics and description). It also appears in best Codex plugins for design and UI.

System Design Skills FAQ

How do I install System Design Skills in Codex?

Add the repo as a Codex plugin marketplace with codex plugin marketplace add proyecto26/system-design-skills, then install it with codex plugin add system-design-skills@system-design-skills-marketplace. Commands: the command format from the Codex CLI reference; check the repo README too.

Is System Design Skills an official Codex plugin?

No. System Design Skills is a community repo on GitHub by proyecto26. It passed the CodexStacks quality filter, but OpenAI hasn't reviewed it, but it passed our Codex install check on Oct 29, 2026 (an install and load check, not a code review), so read the code before you install it.

What does System Design Skills include?

From its manifest and repo files, System Design Skills includes 1 plugin: system-design-skills.

Details

Type: Plugin
Category: Creativity (assigned by us)
Source: Community
Author: Proyecto 26
Version: 0.1.0
License: MIT
GitHub stars: 115 (at last sync)
Last push: 2026-10-27
Manifest: .agents/plugins/marketplace.json
GitHub topics: claude-code, claude-code-plugin, claude-plugin, claude-skills, distributed-systems, high-level-architecture, high-level-design, software-architecture, software-engineer, software-engineering, system-design, system-design-fundamentals
Source: https://github.com/proyecto26/system-design-skills
Website: https://proyecto26.com/system-design-skills/
Listed via: GitHub search: README documents a Codex install
Install check by CodexStacks: Passed on Oct 29, 2026 with Codex CLI 0.163.0: Codex loaded its skills. proof · how we check

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For maintainers: badge and embeds

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Markdown

[![Listed on CodexStacks](https://codexstacks.com/badge.svg)](https://codexstacks.com/p/system-design-skills/)

HTML

<a href="https://codexstacks.com/p/system-design-skills/"><img src="https://codexstacks.com/badge.svg" alt="Listed on CodexStacks" width="172" height="28"></a>

Embed card (static HTML and inline CSS, no JavaScript). Preview:

System Design SkillsCommunity Codex plugin · 1 pluginA divide-and-conquer wiki of system-design skills. Reason about a design problem one part at a time -- requirements…View on CodexStacks →

<a href="https://codexstacks.com/p/system-design-skills/" style="display:block;max-width:380px;box-sizing:border-box;padding:14px 16px;border:1px solid #3a2c26;border-radius:12px;background:#0d0b0a;color:#f3ece6;font:14px/1.45 -apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;text-decoration:none"><span style="display:block;font-size:16px;font-weight:700;color:#f3ece6">System Design Skills</span><span style="display:block;margin:2px 0 8px;font-size:12px;color:#b5a9a1">Community Codex plugin · 1 plugin</span><span style="display:block;margin:0 0 10px;color:#ddd3cc">A divide-and-conquer wiki of system-design skills. Reason about a design problem one part at a time -- requirements…</span><span style="font-size:12px;font-weight:600;color:#ffb347">View on CodexStacks →</span></a>

Markdown summary

**[System Design Skills on CodexStacks](https://codexstacks.com/p/system-design-skills/)**: Community Codex plugin with 1 plugin.

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