agentmods.dev

zod

zod is a skill for Claude Code, Codex from pproenca/dot-skills. It costs 71 tokens per session (1,370 once invoked), scanned A, original, MIT.

A set of best practices for Zod, a TypeScript library that checks whether data matches a defined shape. It covers schemas, parsing, inferred types, validation errors, composed schemas, transformations, and bundle size.

In plain words
What is it for?
Use it when defining Zod schemas, choosing between parse and safeParse, deriving TypeScript types, composing validations, or handling errors and transformations.
Why use it?
It helps ensure that data from users, APIs, or other untrusted sources is checked safely and that validation failures are handled clearly.

Skill for Claude CodeCodex

not rated 201 19d ago A scan 71 tokens original MIT
View the source file pproenca/dot-skills
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/pproenca/dot-skills/zod
Any agent
npx skills add pproenca/dot-skills --skill zod
Clone the repo
git clone --depth 1 https://github.com/pproenca/dot-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for zod

README.md
[![agentmods](https://agentmods.dev/badge/skills/pproenca/dot-skills/zod.svg)](https://agentmods.dev/skills/pproenca/dot-skills/zod)
Your own site
<a href="https://agentmods.dev/skills/pproenca/dot-skills/zod"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/zod.svg" alt="Measured on agentmods" height="20"></a>
Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,370 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00071 $0.01370
Opus 5 $0.00036 $0.00685
Sonnet 5 $0.00014 $0.00274
Haiku 4.5 $0.00007 $0.00137

Measured 4d ago against content hash 245fc4ab7341, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

zod scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

5 near-identical copies found in the catalogue:

  • zod — 100% identical, 0 lines differ
  • zod — 100% identical, 0 lines differ
  • zod — 100% identical, 0 lines differ
  • zod — 100% identical, 0 lines differ
  • zod — 92% identical, 10 lines differ
skills/.curated/zod/SKILL.md · 128 lines

How it starts

The opening of the file, as written. The whole thing — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Zod Best Practices

Comprehensive schema validation guide for Zod in TypeScript applications. Contains 43 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.

When to Apply

Reference these guidelines when:

  • Writing new Zod schemas
  • Choosing between parse() and safeParse()
  • Implementing type inference with z.infer
  • Handling validation errors for user feedback
  • Composing complex object schemas
  • Using refinements and transforms
  • Optimizing bundle size and validation performance
  • Reviewing Zod code for best practices

Rule Categories by Priority

Priority Category Impact Prefix
1 Schema Definition CRITICAL schema-
2 Parsing & Validation CRITICAL parse-
3 Type Inference HIGH type-
4 Error Handling HIGH error-
5 Object Schemas MEDIUM-HIGH object-
6 Schema Composition MEDIUM compose-
7 Refinements & Transforms MEDIUM refine-
8 Performance & Bundle LOW-MEDIUM perf-

Quick Reference

1. Schema Definition (CRITICAL)

  • schema-use-primitives-correctly - Use correct primitive schemas for each type
  • schema-use-unknown-not-any - Use z.unknown() instead of z.any() for type safety
  • schema-avoid-optional-abuse - Avoid overusing optional fields
  • schema-string-validations - Apply string validations at schema definition
  • schema-use-enums - Use enums for fixed string values
  • schema-coercion-for-form-data - Use coercion for form and query data

2. Parsing & Validation (CRITICAL)

  • parse-use-safeparse - Use safeParse() for user input
  • parse-async-for-async-refinements - Use parseAsync for async refinements
  • parse-handle-all-issues - Handle all validation issues not just first
  • parse-validate-early - Validate at system boundaries
  • parse-avoid-double-validation - Avoid validating same data twice
  • parse-never-trust-json - Never trust JSON.parse output

Read the full file on GitHub · 128 lines

Files

What ships with it

48 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 4d ago First seen · 128 lines · 71 tokens per session scan A 245fc4ab7341

Subscribe to this mod's changes

zod is a skill published in the GitHub repository pproenca/dot-skills (201 stars, last pushed 19d ago), licensed MIT. It adds 71 tokens to every session and 1,370 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

FrontendWeb3 and blockchain
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