Not Found the package @modelcontextprotocol/server

[pedroSoaresll]

Guys, does someone else with this problem?

yarn add @modelcontextoprotocol/server
yarn add v1.22.22
[1/4] 🔍  Resolving packages...
error Error: https://registry.yarnpkg.com/@modelcontextoprotocol%2fserver: Not found
    at params.callback [as _callback] (/Users/pedrosoares/.nvm/versions/node/v22.12.0/lib/node_modules/yarn/lib/cli.js:66680:18)
    at self.callback (/Users/pedrosoares/.nvm/versions/node/v22.12.0/lib/node_modules/yarn/lib/cli.js:141410:22)
    at Request.emit (node:events:524:28)
    at Request.<anonymous> (/Users/pedrosoares/.nvm/versions/node/v22.12.0/lib/node_modules/yarn/lib/cli.js:142382:10)
    at Request.emit (node:events:524:28)
    at IncomingMessage.<anonymous> (/Users/pedrosoares/.nvm/versions/node/v22.12.0/lib/node_modules/yarn/lib/cli.js:142304:12)
    at Object.onceWrapper (node:events:638:28)
    at IncomingMessage.emit (node:events:536:35)
    at endReadableNT (node:internal/streams/readable:1698:12)
    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.