z-schema 12.x

Use z-schema ^12.0.0 for JSON Schema validation with synchronous and asynchronous APIs, safe results, draft-aware schemas, custom formats, and registered remote references.

For

z-schema@12.4.5

Verified

2026-09-08, 7 examples executed

Package

@modootoday/pmcp-z-schema@12.0.0

What it covers

• Runtime and defaults
• Synchronous validation
• Safe validation
• Draft-version migration
• Asynchronous validation
• Custom formats
• Remote references
• Recursion
• What this skill does not cover

One example from this skill

This is the skill's own text, not a summary of it. It runs: that is what verifying means here.

import assert from 'node:assert/strict';
import ZSchema from 'z-schema';

const validator = ZSchema.create();
const schema = {
  type: 'object',
  properties: { answer: { type: 'number' } },
  required: ['answer'],
  additionalProperties: false,
};

assert.equal(validator.validate({ answer: 42 }, schema), true);

try {
  validator.validate({ answer: 'wrong' }, schema);
  assert.fail('validation should throw');
} catch (error) {
  assert.equal((error as Error).name, 'ValidateError');
  assert.ok(Array.isArray((error as { details: unknown[] }).details));
}

What it did in the sandbox

Verifying this skill meant installing the package and running code against it with no route out. This is what happened, quoted from the run. The full ledger lists every package examined, including the ones that never became a skill.

• prepare: lefthook install the package
• prepare: lefthook install the package

Getting it

With a subscription:

npx -y @modootoday/pmcp login
npx -y @modootoday/pmcp install @modootoday/pmcp-z-schema

It installs as a dev dependency of your project, and the MCP server finds it there like any other skill.