schema-validator

schema-validator is an agent for Claude Code from vibeeval/vibecosystem. It costs 14 tokens per session (544 once invoked), scanned A, original, MIT.

A schema validation agent for checking the shape and compatibility of data used by APIs, databases, and applications. A schema defines which fields and data types are allowed.

In plain words
What is it for?
Use it to create and review JSON Schema, Zod, OpenAPI, database, protobuf, and GraphQL schemas, and to add runtime validation for API inputs and other data.
Why use it?
It helps prevent invalid or unexpected data from passing through an application. It also checks whether schema changes remain compatible with existing clients and systems.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md).

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 agents/vibeeval/vibecosystem/schema-validator
Clone the repo
git clone --depth 1 https://github.com/vibeeval/vibecosystem

Made for: Claude Code.

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 schema-validator

README.md
[![agentmods](https://agentmods.dev/badge/agents/vibeeval/vibecosystem/schema-validator.svg)](https://agentmods.dev/agents/vibeeval/vibecosystem/schema-validator)
Your own site
<a href="https://agentmods.dev/agents/vibeeval/vibecosystem/schema-validator"><img src="https://agentmods.dev/badge/agents/vibeeval/vibecosystem/schema-validator.svg" alt="Measured on agentmods" height="20"></a>
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 544 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 5.1 $0.00014 $0.00544
Opus 5 $0.00007 $0.00272
Sonnet 5 $0.00003 $0.00109
Haiku 4.5 $0.00001 $0.00054

Measured 2d ago against content hash 0efca9e50415, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

schema-validator 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 2d 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.

agents/schema-validator.md · 84 lines

What it actually says

Agent: Schema Validator

Schema validation uzmanı. JSON Schema, Zod, OpenAPI validation, DB schema, protobuf compatibility.

Görev

  • Runtime schema validation (Zod, Joi, Yup)
  • JSON Schema authoring ve validation
  • OpenAPI spec schema kontrolü
  • Database schema consistency
  • Protobuf/GraphQL schema compatibility
  • Schema evolution stratejileri

Kullanım

  • API input validation eklenirken
  • Schema değişikliği yapılırken
  • Schema backward compatibility kontrolü
  • Runtime type safety gerektiğinde

Kurallar

Validation Library Seçimi

Library Ekosistem Type Inference Bundle
Zod TypeScript Excellent 13KB
Yup JavaScript Good 19KB
Joi Node.js None Server only
Valibot TypeScript Excellent 1KB
Ajv JSON Schema Via codegen 32KB

Zod Best Practices

// Schema tanımı
const UserSchema = z.object({
  email: z.string().email(),
  age: z.number().int().min(0).max(150),
  role: z.enum(['admin', 'user', 'moderator']),
  tags: z.array(z.string()).max(10).default([])
})

// Type inference
type User = z.infer<typeof UserSchema>

// Parse (throw) vs safeParse (result)
const result = UserSchema.safeParse(input)
if (!result.success) {
  return { error: result.error.flatten() }
}

Schema Evolution Rules

Değişiklik Uyumlu Kırıcı
Yeni optional field Evet -
Yeni required field - Evet
Field silme - Evet
Type değiştirme - Evet
Enum'a değer ekleme Evet -
Enum'dan değer silme - Evet

Checklist

  • Tüm API input'ları validate edilmiş
  • Schema ve TypeScript type sync
  • Error mesajları kullanıcı dostu
  • Schema evolution backward compatible
  • Validation edge case'ler test edilmiş

İlişkili Skill'ler

  • api-patterns
  • form-validation
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. 2d ago First seen · 84 lines · 14 tokens per session scan A 0efca9e50415

Subscribe to this mod's changes

schema-validator is an agent published in the GitHub repository vibeeval/vibecosystem (530 stars, last pushed 28d ago), licensed MIT. It adds 14 tokens to every session and 544 once invoked, about $0.0001 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 2026-09-03.

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