alpha.3: CfWorkerJsonSchemaValidator and AjvJsonSchemaValidator declared in types but missing from runtime index.mjs export

[morluto]

Bug

In @modelcontextprotocol/server@2.0.0-alpha.3, CfWorkerJsonSchemaValidator and AjvJsonSchemaValidator are declared in the type declarations (dist/index.d.mts) and listed in the export type statement, but are missing from the runtime dist/index.mjs export. This causes a runtime SyntaxError when importing them from the package root.

Package version

@modelcontextprotocol/server@2.0.0-alpha.3

Reproduction

import { CfWorkerJsonSchemaValidator } from "@modelcontextprotocol/server";
const validator = new CfWorkerJsonSchemaValidator();

Results in:

SyntaxError: Export named 'CfWorkerJsonSchemaValidator' not found in module '.../dist/index.mjs'.

The same happens with AjvJsonSchemaValidator.

Evidence

Type declarations (dist/index.d.mts) — both are present

import { t as AjvJsonSchemaValidator } from "./ajvProvider-DZ_siXcF.mjs";
import { t as CfWorkerJsonSchemaValidator } from "./cfWorkerProvider-DUhk5Ewx.mjs";

export { ..., AjvJsonSchemaValidator, ..., CfWorkerJsonSchemaValidator, CfWorkerSchemaDraft, ... };

Runtime (dist/index.mjs) — both are absent

export { BAGGAGE_META_KEY, CLIENT_CAPABILITIES_META_KEY, ..., fromJsonSchema, getDisplayName, ..., validateHostHeader };
// No CfWorkerJsonSchemaValidator, no AjvJsonSchemaValidator

Subpath exports work correctly

The package.json exports field includes subpath entries that DO export them at runtime:

{
  "./validators/ajv": {
    "types": "./dist/validators/ajv.d.mts",
    "import": "./dist/validators/ajv.mjs"
  },
  "./validators/cf-worker": {
    "types": "./dist/validators/cfWorker.d.mts",
    "import": "./dist/validators/cfWorker.mjs"
  }
}

// dist/validators/cfWorker.mjs
import { t as CfWorkerJsonSchemaValidator } from "../cfWorkerProvider-BrJKpSFH.mjs";
export { CfWorkerJsonSchemaValidator };

So the classes exist and are exported via subpaths — the main index.mjs bundle just forgot to re-export them.

Workaround

Import from the subpath export instead of the package root:

import { CfWorkerJsonSchemaValidator } from "@modelcontextprotocol/server/validators/cf-worker";
import { AjvJsonSchemaValidator } from "@modelcontextprotocol/server/validators/ajv";

Expected behavior

Either:

1. Re-export CfWorkerJsonSchemaValidator and AjvJsonSchemaValidator from dist/index.mjs (matching the type declarations), or
2. Remove them from the dist/index.d.mts export list if the intent is to only expose them via subpath exports.

Option 1 is preferable since the type declarations already promise these exports from the root, and consumers importing from @modelcontextprotocol/server will expect them to be available at runtime.