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Run npx skillmds@latest add mearman/schema-meta in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Who published Schema Meta?

Mearman (@mearman) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Schema Meta by mearman — Agent Skill

Name: Schema Meta
Author: Mearman

Schema Meta

Validate that a JSON Schema is well-formed and conforms to the JSON Schema specification. Use when the user asks to check if a schema is valid, verify schema syntax, validate schema structure, or check a JSON Schema file for errors.

Mearman a5ac6f5 2.2 KB Updated Sep 17, 2026

File contents

Validate JSON Schema (Meta-Validation)

Validate that a JSON Schema document is itself a valid schema according to the JSON Schema specification.

Usage

npx tsx scripts/meta-validate.ts <schema-file> [options]

Arguments

Argument	Required	Description
`schema-file`	Yes	Path to the JSON Schema file to validate

Options

Option	Description
`--draft=VERSION`	JSON Schema draft version (draft-04, draft-06, draft-07, 2019-09, 2020-12). Default: auto-detect
`--strict`	Enable strict mode (additional validation rules)
`--verbose`	Show detailed validation information

Output

Valid schema:

Valid JSON Schema (draft-2020-12)
  Keywords: 5
  Definitions: 2

Invalid schema:

Invalid JSON Schema
  Error: "type" must be a string or array
  Path: /properties/name/type

Script Execution

npx tsx scripts/meta-validate.ts schema.json
npx tsx scripts/meta-validate.ts schema.json --draft=draft-07
npx tsx scripts/meta-validate.ts schema.json --strict --verbose

Run from the json-schema plugin directory: ~/.claude/plugins/cache/json-schema/

Draft Version Detection

The script auto-detects the JSON Schema draft version from:

The $schema keyword in the document
Falls back to draft-2020-12 if not specified

Supported drafts:

draft-04 - JSON Schema Draft 4
draft-06 - JSON Schema Draft 6
draft-07 - JSON Schema Draft 7
2019-09 - JSON Schema Draft 2019-09
2020-12 - JSON Schema Draft 2020-12 (default)

Strict Mode

When --strict is enabled, additional validations are performed:

Disallow unknown keywords
Require $schema declaration
Validate format assertions by default

Related Skills

Use schema-validate to validate JSON data against a schema
Use schema-check to validate a JSON file against its embedded $schema

---name: schema-metadescription: Validate that a JSON Schema is well-formed and conforms to the JSON Schema specification. Use when the user asks to check if a schema is valid, verify schema syntax, validate schema structure, or check a JSON Schema file for errors.---# Validate JSON Schema (Meta-Validation)Validate that a JSON Schema document is itself a valid schema according to the JSON Schema specification.## Usage```bashnpx tsx scripts/meta-validate.ts <schema-file> [options]```### Arguments| Argument | Required | Description ||----------|----------|-------------|| `schema-file` | Yes | Path to the JSON Schema file to validate |### Options| Option | Description ||--------|-------------|| `--draft=VERSION` | JSON Schema draft version (draft-04, draft-06, draft-07, 2019-09, 2020-12). Default: auto-detect || `--strict` | Enable strict mode (additional validation rules) || `--verbose` | Show detailed validation information |### OutputValid schema:```Valid JSON Schema (draft-2020-12) Keywords: 5 Definitions: 2```Invalid schema:```Invalid JSON Schema Error: "type" must be a string or array Path: /properties/name/type```## Script Execution```bashnpx tsx scripts/meta-validate.ts schema.jsonnpx tsx scripts/meta-validate.ts schema.json --draft=draft-07npx tsx scripts/meta-validate.ts schema.json --strict --verbose```Run from the json-schema plugin directory: `~/.claude/plugins/cache/json-schema/`## Draft Version DetectionThe script auto-detects the JSON Schema draft version from:1. The `$schema` keyword in the document2. Falls back to draft-2020-12 if not specifiedSupported drafts:- `draft-04` - JSON Schema Draft 4- `draft-06` - JSON Schema Draft 6- `draft-07` - JSON Schema Draft 7- `2019-09` - JSON Schema Draft 2019-09- `2020-12` - JSON Schema Draft 2020-12 (default)## Strict ModeWhen `--strict` is enabled, additional validations are performed:- Disallow unknown keywords- Require `$schema` declaration- Validate format assertions by default## Related Skills- Use `schema-validate` to validate JSON data against a schema- Use `schema-check` to validate a JSON file against its embedded `$schema`

Frequently asked questions