oakoss/agent-skills
ArkType runtime validation with TypeScript-native syntax.
npx skills add oakoss/agent-skills --skill arktype-validation
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npx skills add oakoss/agent-skills
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SKILL.md
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SUMMARY.md
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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
| 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 |
| 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 |
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.