Zod Skill
AI agent skill for Zod v4 — 27 rules: schema design, parsing, error handling, type inference. Works with Claude Code, Cursor, Codex, Windsurf.
Install
npx skills add anivar/zod-skill -gclaude mcp add zod-skill -- npx skills add anivar/zod-skill -g{
"mcpServers": {
"zod-skill": {
"command": "npx",
"args": [
"skills",
"add",
"anivar/zod-skill",
"-g"
]
}
}
}Install command taken from the project's README or registry entry. Always review code before running it.
README excerpt
Read full README on GitHub →Zod Skill
Created by Anivar Aravind
An AI agent skill for writing, validating, and debugging Zod v4 schemas with modern best practices.
The Problem
AI agents often generate outdated Zod v3 patterns — z.string().email() instead of z.email(), z.nativeEnum() instead of the unified z.enum(), required_error instead of the error parameter — and miss critical parsing pitfalls like using parse() instead of safeParse(), forgetting parseAsync for async refinements, or assuming z.object() preserves unknown keys. These produce schemas that compile but silently misbehave at runtime.
This Solution
27 rules with incorrect→correct code examples that teach agents Zod v4's actual API behavior, schema design patterns, error handling, architectural placement, observability, and TypeScript integration. Each rule targets a specific mistake and shows exactly how to fix it.
Install
npx skills add anivar/zod-skill -g
Testing schemas is covered too, merged from the former zod-testing skill —
see references/testing.md.
Or with full URL:
npx skills add https://github.com/anivar/zod-skill
Baseline
- zod ^4.3.0 (tracks 4.4.x; audited against zod.dev, August 2026)
- TypeScript ^5.5
The skill is checked against Zod's own documentation rather than its release
notes, which matters more than it sounds: several APIs announced in 4.3
releases — slugify, .with(), .apply(), .overwrite(), .register() —
have no presence in the documentation, and a skill that taught them would be
teaching an interface the project has not committed to.
What's Inside
27 Rules Across 9 Categories
| Priority | Category | Rules | Impact |
|---|---|---|---|
| 1 | Parsing & Type Safety | 3 | CRITICAL |
| 2 | Schema Design | 4 | CRITICAL |
| 3 | Refinements & Transforms | 3 | HIGH |
| 4 | Error Handling | 3 | HIGH |
| 5 | Performance & Composition | 3 | MEDIUM |
| 6 | v4 Migration | 3 | MEDIUM |
| 7 | Advanced Patterns | 3 | MEDIUM |
| 8 | Architecture & Boundaries | 3 | CRITICAL/HIGH |
| 9 | Observability | 2 | HIGH/MEDIUM |
Each rule file contains:
- Why it matters
- Incorrect code with explanation
- Correct code with explanation
- Decision tables and additional context
9 Deep-Dive References
| Reference | Covers |
|---|---|
schema-types.md |
All primitives, string formats, numbers, enums, dates, files, JSON |
parsing-and-inference.md |
parse, safeParse, parseAsync, z.infer, z.input, coercion |
objects-and-composition.md |
object/strict/loose, pick, omit, partial, recursive, unions, tuples |
refinements-and-transforms.md |
refine, superRefine, transform, pipe, defaults, catch |
error-handling.md |
ZodError, flattenError, treeifyError, error customization, i18n |
advanced-features.md |
Codecs, branded types, JSON Schema, registries, Standard Schema |
anti-patterns.md |
14 common mistakes with BAD/GOOD examples |
boundary-architecture.md |
Where Zod fits: Express, tRPC, Next.js, React Hook Form, env, external APIs |
linter-and-ci.md |
ESLint rules, CI schema snapshots, unused schema detection, circular deps |
Structure
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