ClaudSkills / Engineering / architecture

One Three One Rule

Category: Engineering · Sub-category: architecture

Structured decision-making framework for technical proposals and trade-off analysis. When the user faces a choice between multiple approaches (architecture decisions, tool selection, refactoring strategies, migration paths), this skill produces a 1-3-1 format: one clear problem statement, three distinct options with pros/cons, and one concrete recommendation with definition of done and implementation plan. Use when the user asks for a "1-3-1", says "give me options", or needs help choosing between competing approaches.

What this skill does

One Three One Rule is a community-contributed Claude Code skill in the architecture sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/one-three-one-rule/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user asks for a "1-3-1", says "give me options", or needs help choosing between competing approaches.

Who uses this skill

The One Three One Rule skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It is part of the open ClaudSkills registry, a community-curated catalog of 56,000+ capabilities you can install for Claude Code — the Claude CLI agent.

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/one-three-one-rule
curl -L https://claudskills.com/skills/one-three-one-rule/SKILL.md \
  -o ~/.claude/skills/one-three-one-rule/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/one-three-one-rule/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/one-three-one-rule/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\one-three-one-rule\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

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