Is the System Design Frameworks skill free?

Yes. The skill itself is free from kirilxd/swe-interview-coach. SkillProof publishes the install command and an independent test verdict at no cost.

What is the System Design Frameworks SkillProof Score?

9.2/10 — installs cleanly 5/5, triggers reliably 4/5, output vs. baseline 9/10, docs & honesty 5/5.

How do I install System Design Frameworks?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use System Design Frameworks with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

System Design Frameworks

RESHADED/4S frameworks, capacity-estimation cheatsheet, and tradeoff tables for system-design interviews.

by kirilxd · kirilxd/swe-interview-coach

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.2/10
Tested: Jul 14, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · fd999fd

Answered 'design a rate limiter' twice: unguided baseline was a single hand-wavy 'use a Redis counter' paragraph with zero numbers; the 4S-guided answer compared token-bucket vs sliding-window-counter, specified an atomic Lua INCR+EXPIRE, ran real capacity math, and named a fail-open/fail-closed tradeoff for a Redis outage -- a night-and-day difference in rigor.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 4/5
Output vs. baseline 9/10
Docs & honesty 5/5

What System Design Frameworks does

Reference material for system-design interview prep: the RESHADED and 4S structuring frameworks, a capacity-estimation cheatsheet with latency numbers, core building blocks (load balancing, caching, queues, sharding, replication, CAP), common tradeoffs, and anti-patterns, each with a weak-vs-strong answer example. Triggers on the plugin's /mock-sysdesign, /practice-sysdesign, /sysdesign-explain, /debrief-sysdesign commands, or any discussion of architecture, capacity estimation, or design tradeoffs.

How to install System Design Frameworks

git clone https://github.com/kirilxd/swe-interview-coach
cd swe-interview-coach
mkdir -p ~/.claude/skills
cp -r skills/system-design-frameworks ~/.claude/skills/system-design-frameworks

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger System Design Frameworks

/system-design-frameworks RESHADED/4S frameworks, capacity-estimation cheatsheet, and tradeoff tables for system-design interviews.

It also activates on plain-language prompts like these:

Help me practice structuring a system design interview answer
Walk me through the RESHADED framework for this design question
I need a capacity estimation cheatsheet for my interview prep

Frequently asked questions

Is the System Design Frameworks skill free?: Yes. The skill itself is free from kirilxd/swe-interview-coach. SkillProof publishes the install command and an independent test verdict at no cost.
Does System Design Frameworks work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 14, 2026. Verdict: Tested · Works. Answered 'design a rate limiter' twice: unguided baseline was a single hand-wavy 'use a Redis counter' paragraph with zero numbers; the 4S-guided answer compared token-bucket vs sliding-window-counter, specified an atomic Lua INCR+EXPIRE, ran real capacity math, and named a fail-open/fail-closed tradeoff for a Redis outage -- a night-and-day difference in rigor.
What is the System Design Frameworks SkillProof Score?: 9.2/10 — installs cleanly 5/5, triggers reliably 4/5, output vs. baseline 9/10, docs & honesty 5/5.
How do I install System Design Frameworks?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use System Design Frameworks with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.