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back-of-the-envelope

100 / 100 · Low risk

Fine to try.

By proyecto26/system-design-skills (GitHub) · design · 131 stars · scanned at commit 228d57d

This skill should be used when the user needs to "estimate QPS", "back-of-the-envelope" (BOTEC) numbers, "how much storage / bandwidth", "how many servers", "peak load", "capacity planning", or wants the standard latency / throughput / availability numbers to ground a design (latency table, QPS rates, powers of two, nines). Use it whenever a design decision hinges on scale — convert any "high traffic" / "huge data" phrase into concrete numbers before choosing components, even if the user doesn'…

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'back-of-the-envelope' ] || [ -L ~/.agents/skills/'back-of-the-envelope' ]; then echo 'A skill folder named back-of-the-envelope already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/proyecto26/system-design-skills' "$d" && git -C "$d" checkout --quiet '228d57dc6fa7627a6426553fdd6ad0040e36f361' -- 'skills/back-of-the-envelope' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/back-of-the-envelope' ~/.agents/skills/'back-of-the-envelope' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'back-of-the-envelope' ~/.claude/skills/'back-of-the-envelope' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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