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arktype-validation AI Agent Skill
View Source: oakoss/agent-skills
SafeInstallation
npx skills add oakoss/agent-skills --skill arktype-validation 55
Installs
ArkType Validation
Overview
ArkType is a TypeScript-native runtime validation library that defines schemas using string expressions mirroring TypeScript syntax, providing editor autocomplete, syntax highlighting, and optimized validators. Use when building type-safe APIs, validating JSON payloads, or replacing Zod with a more TypeScript-idiomatic approach. Not suitable for projects that need Zod ecosystem compatibility or JSON Schema output.
Package: arktype
Quick Reference
| Pattern | Usage |
|---|---|
type({ key: "string" }) |
Define object schema |
type("string") |
Primitive type |
"string.email", "string.url" |
Built-in string validators |
"string.trim", "string.lower" |
Built-in string morphs (transforms) |
"string.json.parse" |
Parse JSON string to validated object |
"number > 0", "string >= 1" |
Inline constraints |
"string | number" |
Union types |
"'a' | 'b' | 'c'" |
String literal unions |
"string[]" |
Array types |
"key?": "string" |
Optional properties |
"key = 'default'" |
Default values |
.pipe(), .to() |
Transform output (morphs) |
.narrow() |
Custom validation (like Zod refine) |
.pick(), .omit() |
Object property selection |
.merge() |
Combine object types |
scope({...}).export() |
Named type scopes with cross-references |
type("<t>", { box: "t" }) |
Generic type definitions |
type.errors |
Error handling (check instanceof type.errors) |
.assert(data) |
Throws on invalid input instead of returning |
"(number % 2)#even" |
Branding — type-only validated marker |
"0 <= number <= 100" |
Compact range constraints |
configure() |
Global defaults (from arktype/config) |
match() |
Type-safe pattern matching (2.1) |
"+" : "reject" |
Inline undeclared key handling |
arkenv({ PORT: "number" }) |
Typesafe env var validation (ArkEnv) |
arkenvVitePlugin(Env) |
Build-time env validation for Vite |
Common Mistakes
| Mistake | Fix |
|---|---|
type("string.email()") with parens |
type("string.email") (no parens) |
Checking errors with === null |
Use instanceof type.errors |
{ key: "string?" } for optional |
{ "key?": "string" } (question mark on key) |
Importing from arktype/types |
Import type and scope from "arktype" |
Nested type() in string expressions |
Use scope() for cross-referencing types |
Raw .pipe() without error handling |
Use .pipe.try() for operations that can throw |
"string.lowercase" for case morph |
"string.lower" (also "string.upper") |
Configuring after importing arktype |
Import arktype/config before arktype |
Manual process.env parsing |
Use arkenv() for auto-coercion and validation |
Delegation
Use this skill for ArkType schema definitions, runtime validation, morphs/transforms, scopes, and type inference. For Zod-based validation, delegate to the zod-validation skill.
References
- Schema Types — primitives, string keywords, number constraints, objects, arrays, tuples, unions, optional, defaults
- Morphs and Scopes — pipe, morph transforms, narrow validation, scopes, recursive types, generics, global configuration, pattern matching
- Common Patterns — JSON parsing, form validation, API responses, error handling, ArkEnv environment variables, Vite plugin, comparison with Zod
Installs
Security Audit
View Source
oakoss/agent-skills
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How to use this skill
Install arktype-validation by running npx skills add oakoss/agent-skills --skill arktype-validation in your project directory. Run the install command above in your project directory. The skill file will be downloaded from GitHub and placed in your project.
No configuration needed. Your AI agent (Claude Code, Cursor, Windsurf, etc.) automatically detects installed skills and uses them as context when generating code.
The skill enhances your agent's understanding of arktype-validation, helping it follow established patterns, avoid common mistakes, and produce production-ready output.
What you get
Skills are plain-text instruction files — not executable code. They encode expert knowledge about frameworks, languages, or tools that your AI agent reads to improve its output. This means zero runtime overhead, no dependency conflicts, and full transparency: you can read and review every instruction before installing.
Compatibility
This skill works with any AI coding agent that supports the skills.sh format, including Claude Code (Anthropic), Cursor, Windsurf, Cline, Aider, and other tools that read project-level context files. Skills are framework-agnostic at the transport level — the content inside determines which language or framework it applies to.
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