Ajv defaults: non-standard "format": "json" in third-party schemas (e.g. Notion) warns twice per property — register it like #2601

Observe la función createDefaultAjvInstance en el módulo validador del SDK. El problema trata sobre agregar un formato de no operación para 'json' a las instancias de Ajv para suprimir advertencias. Revise cómo se registró 'google-duration' en el issue #2601 como referencia. El cambio implica modificar la configuración del validador predeterminado para incluir ajv.addFormat('json', true) para los tres motores de dialecto (Ajv2020, Ajv2019, Ajv). Después de realizar el cambio, pruebe con el código de reproducción proporcionado para asegurarse de que las advertencias hayan desaparecido.

Context

This is the same class of noise as #2601 (google-duration), with an instance found in the wild.

The Notion MCP server's post-page tool annotates two string properties with "format": "json" — a value that is defined neither by JSON Schema nor by ajv-formats. Compiling that inputSchema through the default validator instances of @modelcontextprotocol/client@2.0.0 (createDefaultAjvInstance: { strict: false, allErrors: true } + ajv-formats) logs, per compile:

unknown format "json" ignored in schema at path "#/properties/icon"
unknown format "json" ignored in schema at path "#/properties/icon"
unknown format "json" ignored in schema at path "#/properties/cover"
unknown format "json" ignored in schema at path "#/properties/cover"

Two lines per property, because allErrors: true makes Ajv compile the format check twice — i.e. connecting to that one server costs 4 lines of client-side warning output per session.

It is not purely cosmetic: with Ajv's own defaults (strict: true) the same schema throws during compile (Error: unknown format "json" ignored in schema at path "#/properties/icon"), so any integrator who wants a strict validator cannot load that tool.

Ask

1. Register json as a no-op format (ajv.addFormat("json", true)) in createDefaultAjvInstance, for all three dialect engines, alongside the google-duration registration proposed in #2601; or
2. Downgrade the unknown-format message to debug-level output, so quirks in third-party schemas don't surface as user-visible warnings.

Note on custom validator providers

Consumers that pass their own Ajv instance to AjvJsonSchemaValidator bypass the default instances entirely, so registering formats there does not help them — e.g. a downstream extension that constructs its own validator provider still gets the warnings until it registers json itself. Worth a line in the validator docs.

Environment / reproduction

@modelcontextprotocol/client 2.0.0 · ajv 8.20.0 · node 24.12.0

import Ajv2020 from "ajv/dist/2020.js";
import addFormats from "ajv-formats";

const ajv = new Ajv2020({ strict: false, allErrors: true });  // mirrors createDefaultAjvInstance
addFormats(ajv);

ajv.compile({
  type: "object",
  properties: {
    icon:  { type: "string", format: "json" },
    cover: { type: "string", format: "json" },
  },
});
// -> the four "unknown format" lines above

Filed after reproducing the behaviour locally with the reporter's coding agent; outputs above are from that run and can be provided on request.