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Type Safety

Category: Engineering  ·  Sub-category: backend  ·  Last updated:
lang:typescript
Use when reasoning about types as a quality property of code: what guarantees the type system actually provides, the difference between sound and unsound systems, structural vs nominal typing, type narrowing and exhaustiveness, the runtime/compile-time boundary, and where validation must happen because the type system cannot. Covers TypeScript, Flow, Hindley-Milner languages, and gradual typing in general. Do NOT use for runtime input validation library choice (use api-design for API surface validation; use individual library docs for library mechanics), for SQL type mapping (use data-modeling), or for type system implementation (compilers — out of scope).

What this skill does

Type Safety is a community-contributed Claude Code skill in the backend sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/type-safety/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when reasoning about types as a quality property of code: what guarantees the type system actually provides, the difference between sound and unsound systems, structural vs nominal typing, type narrowing and exhaustiveness, the runtime/compile-time boundary, and where validation must happen because the type system cannot. Covers TypeScript, Flow, Hindley-Milner languages, and gradual typing in general.

Who uses this skill

The Type Safety Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/type-safety
curl -L https://claudskills.com/skills/type-safety/SKILL.md \
  -o ~/.claude/skills/type-safety/SKILL.md

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

Skills live at ~/.claude/skills/type-safety/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\type-safety\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

Attribution & license

More Engineering skills

Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Engineering skills → Top 100 skills
Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills.  ·  What's New  ·  Install guide  ·  About  ·  llms.txt

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