Anthropic's MCP Server Dev Plugin Lands

This is a meaningful developer-experience upgrade for MCP: less boilerplate, better architectural decisions, and more attention to shipping and security.

• –`build-mcp-server` recommends deployment models, tool patterns, and TypeScript or Python frameworks
• –`build-mcp-app` adds forms, pickers, confirmations, charts, and live UI widgets inside Claude
• –`build-mcpb` packages local servers with their runtime, removing Node.js or Python setup for users
• –Auth flows, iframe constraints, manifest schemas, and security hardening are included as reference material
• –Anthropic is effectively standardizing how developers move from MCP prototype to distributable product [GitHub source](https://github.com/anthropics/claude-plugins-official/tree/main/plugins/mcp-server-dev)