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zod-validation AI Agent Skill
View Source: oakoss/agent-skills
SafeInstallation
npx skills add oakoss/agent-skills --skill zod-validation 51
Installs
Zod Validation (v4)
Type-safe schema validation for TypeScript. Zod v4 introduces top-level format functions, z.stringbool(), z.iso.* date formats, z.overwrite() transforms, z.file(), z.toJSONSchema(), getter-based recursive types, .meta(), and the unified error function.
Package: zod (also zod/mini for smaller bundles)
Quick Reference
| Pattern | Usage |
|---|---|
z.object({ ... }) |
Define object schemas |
z.string(), z.number() |
Primitive types |
z.email(), z.url(), z.uuid() |
Top-level string formats (v4) |
z.iso.date(), z.iso.datetime() |
ISO date/time formats (v4) |
z.int(), z.float32(), z.int32() |
Fixed-width number formats (v4) |
z.templateLiteral([...]) |
Template literal type validation (v4) |
z.enum([...]), z.literal() |
Enums and literals |
z.union([...]), z.discriminatedUnion() |
Union types |
z.array(), z.tuple() |
Array and tuple types |
z.record(), z.map() |
Key-value collections |
.optional(), .nullable() |
Optional and nullable modifiers |
.default(), .catch() |
Default values and fallbacks |
.prefault() |
Pre-parse default (parsed through schema, v4) |
z.coerce.number() |
Type coercion before validation |
z.stringbool() |
String-to-boolean parsing (v4) |
.transform(), .overwrite() |
Output transforms |
z.pipe() |
Chain schemas (output feeds next input) |
.refine(), .superRefine() |
Custom validation logic |
.parse(), .safeParse() |
Validate and extract data |
z.infer<typeof Schema> |
Extract TypeScript type from schema |
z.input<>, z.output<> |
Input vs output types with transforms |
z.file() |
File instance validation (v4) |
z.toJSONSchema() |
Convert schema to JSON Schema (v4) |
.meta(), .describe() |
Attach metadata to schemas (v4) |
z.prettifyError() |
Human-readable error formatting (v4) |
z.treeifyError() |
Structured error tree (replaces .format(), v4) |
z.registry() |
Typed schema registry (v4) |
{ error: (issue) => ... } |
Unified error customization (v4) |
| Getter-based recursion | Recursive types without z.lazy() (v4) |
z.globalRegistry |
Global schema metadata registry (v4) |
z.config(z.locales.en()) |
Internationalized error messages (v4) |
Common Mistakes
| Mistake | Fix |
|---|---|
z.string().email() |
z.email() (v4 top-level format) |
z.string().url() |
z.url() (v4 top-level format) |
Using parse without try/catch |
Use safeParse for error handling |
Forgetting .optional() |
Add when field may be undefined |
z.any() for unknown data |
Use z.unknown() for type-safe unknown |
.transform() for same-type changes |
Use .overwrite() (introspectable, v4) |
Missing .min(1) on strings |
Empty strings pass z.string() by default |
z.number().parse(Infinity) |
z.number() rejects Infinity in v4 |
z.number().safe() for floats |
.safe() equals .int() in v4 (no floats) |
z.lazy() for recursive types |
Use getter syntax in v4 (retains object methods) |
required_error / invalid_type_error |
Use unified error function in v4 |
.refine(fn, (val) => ({ message })) |
Function-as-second-arg overload removed; use .superRefine() |
errorMap on schemas |
Replaced by error function in v4 |
z.record(z.string()) single arg |
v4 requires two args: z.record(z.string(), z.string()) |
.format() / .flatten() on ZodError |
Deprecated; use z.treeifyError(err) in v4 |
.default() with input type value |
v4 .default() uses output type; use .prefault() for input |
Delegation
Use this skill for Zod schema definition, validation, parsing, type inference, coercion, error formatting, metadata, and JSON Schema conversion. For form integration, delegate to the tanstack-form skill.
References
- Schema Types — primitives, string formats, number formats, template literals, objects, arrays, enums, unions, records, optional, nullable
- Transforms and Parsing — coercion, stringbool, transforms, overwrite, pipe, refinements, parsing, type inference
- Error Handling — unified error function, prettifyError, treeifyError, ZodError, error formatting, internationalization
- Common Patterns — form validation, API responses, environment variables, schema composition, recursive types, branded types
- Metadata and JSON Schema — meta, describe, globalRegistry, toJSONSchema, file validation, Zod Mini
Installs
Security Audit
View Source
oakoss/agent-skills
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How to use this skill
Install zod-validation by running npx skills add oakoss/agent-skills --skill zod-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 zod-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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