skill CX Codex

code-craft — Claude Code skill: what it does, how to install

Q: How do I install code-craft in Claude Code?

Run `npx skills add jssblck/agents --skill code-craft -a claude-code`, then check `~/.claude/skills/code-craft/SKILL.md`.

Q: Which languages does code-craft support?

The skill accepts `rust`, `typescript`, `go`, or `python` as its language argument, followed by a target.

code-craft guides type boundaries, invariants, state, effects, errors, and abstraction choices. Use it when an agent is shaping a code change.

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

npx skills add jssblck/agents --skill code-craft -a claude-code

Open on GitHub

What code-craft does

code-craft gives an agent a way to place design guarantees at the right level. It favors types and linters first, then effects, proofs, database constraints, and tests when stronger checks cannot establish the rule. The skill also covers domain states, external input, dependency effects, recoverable errors, and module boundaries.

Its guidance is split across references for illegal states, parsing, effects, proof parameters, simplicity, and architecture docs. Language notes are available for Rust, TypeScript, Go, and Python. In an existing repository, adding Effect, Zod, xstate, gdp-ts, or the listed Rust stack counts as an architecture change that should be discussed first.

The skill points database work to database-craft, test-level decisions to testing-craft, and repository setup to project-bootstrap. Its argument hint accepts [rust|typescript|go|python] [target].

What it helps with

place invariants at the right verification level
turn external input into useful types
model domain states and identities
separate recoverable errors from required gates
choose a simpler abstraction for the change

Example prompts for the agent

Use code-craft for a typescript change in the billing module.
Apply code-craft to this rust server and decide who owns each invariant.
Review this python parser with code-craft for the target parser.

How to install code-craft

1Skills CLI (Vercel)

npx skills add jssblck/agents --skill code-craft -a claude-code

2Manually: put the files in place

~/.claude/skills/code-craft/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/code-craft/

1Skills CLI (Vercel)

npx skills add jssblck/agents --skill code-craft -a codex

2Manually: put the files in place

.agents/skills/code-craft/SKILL.md

For all projects use ~/.agents/skills/

1Skills CLI (Vercel)

npx skills add jssblck/agents --skill code-craft -a cursor

2Manually: put the files in place

.cursor/skills/code-craft/SKILL.md

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

1GitHub CLI

gh skill install jssblck/agents code-craft

2Manually: put the files in place

.github/skills/code-craft/SKILL.md

1Skills CLI (Vercel)

npx skills add jssblck/agents --skill code-craft -a gemini-cli

2Platform CLI

gemini skills install https://github.com/jssblck/agents --path skills/code-craft

Manually: put the files in place

.devin/skills/code-craft/SKILL.md

The legacy .windsurf/skills/ path still works

Skills CLI (Vercel)

npx skills add jssblck/agents --skill code-craft -a opencode

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

Questions about code-craft

How do I install code-craft in Claude Code?

Run npx skills add jssblck/agents --skill code-craft -a claude-code, then check ~/.claude/skills/code-craft/SKILL.md.

What does code-craft do?

It guides decisions about invariants, type boundaries, state models, effects, errors, proofs, and abstractions. It also tells the agent when to use related skills for databases, testing, or project setup.

Which languages does code-craft support?

The skill accepts rust, typescript, go, or python as its language argument, followed by a target.

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