skill CX Codex

1-3-1 — Claude Code skill: what it does, how to install

Q: How do I install 1-3-1 in Claude Code?

Run `npx skills add timschoch/skilly --skill 1-3-1 -a claude-code` in your terminal.

Frames tricky engineering decisions into one root problem, three distinct options with tradeoffs, and a single firm recommendation.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓

npx skills add timschoch/skilly --skill 1-3-1 -a claude-code

Open on GitHub

What 1-3-1 does

The skill stops the assistant from rushing into the first plausible solution. It forces Claude to isolate the root problem into a single sentence before comparing alternatives. Next, the agent presents three genuinely distinct paths, contrasting them across execution cost and reversibility. Fabricating weak placeholder options just to hit the number three is explicitly forbidden.

Only after mapping out alternatives does the assistant commit to one recommendation. It takes a definite stance and defines the exact circumstance that would invalidate the choice. For visual layouts or UI trade-offs, the prompt suggests offering /prototype, since inspectable code resolves interface debates faster than prose.

What it helps with

isolate the root cause behind an ambiguous technical dilemma
evaluate alternative technical paths alongside their tradeoffs
eliminate fake strawman options during decision-making
define explicit conditions that trigger revisiting a choice

Example prompts for the agent

Run a 1-3-1 on whether to migrate our background jobs to Redis or stay on Postgres
Help me decide if we should rewrite the billing module or refactor it in place
Do a 131 to weigh the tradeoffs for our caching strategy

How to install 1-3-1

1Skills CLI (Vercel)

npx skills add timschoch/skilly --skill 1-3-1 -a claude-code

2Manually: put the files in place

~/.claude/skills/1-3-1/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/1-3-1/

1Skills CLI (Vercel)

npx skills add timschoch/skilly --skill 1-3-1 -a codex

2Manually: put the files in place

.agents/skills/1-3-1/SKILL.md

For all projects use ~/.agents/skills/

1Skills CLI (Vercel)

npx skills add timschoch/skilly --skill 1-3-1 -a cursor

2Manually: put the files in place

.cursor/skills/1-3-1/SKILL.md

Cursor also reads .agents/skills/ and .claude/skills/

1GitHub CLI

gh skill install timschoch/skilly 1-3-1

2Manually: put the files in place

.github/skills/1-3-1/SKILL.md

1Skills CLI (Vercel)

npx skills add timschoch/skilly --skill 1-3-1 -a gemini-cli

2Platform CLI

gemini skills install https://github.com/timschoch/skilly --path bundles/workflow/skills/1-3-1

Manually: put the files in place

.devin/skills/1-3-1/SKILL.md

The legacy .windsurf/skills/ path still works

Skills CLI (Vercel)

npx skills add timschoch/skilly --skill 1-3-1 -a opencode

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about 1-3-1

How do I install 1-3-1 in Claude Code?

Run npx skills add timschoch/skilly --skill 1-3-1 -a claude-code in your terminal.

What does 1-3-1 do?

It forces the AI to summarize the problem in one sentence, evaluate three distinct paths with explicit tradeoffs, and commit to one pick with a flip condition.

How does it handle interface and visual forks?

When visual review is clearer than reading descriptions, the prompt pairs the final recommendation with a /prototype suggestion.

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