This handles Model Context Protocol server integration for Claude Code plugins, letting you expose external services as tools. You get four connection types: stdio for local processes, SSE for OAuth-enabled cloud services, HTTP for REST APIs, and WebSocket for real-time stuff. The configuration lives in either a dedicated .mcp.json or inline in plugin.json, with automatic environment variable expansion using ${CLAUDE_PLUGIN_ROOT} for portability. Tools get prefixed as mcp__plugin_name_server__tool_name and can be pre-allowed in command frontmatter. The documentation is thorough on lifecycle management and auth patterns, which matters because you're dealing with credentials and external connections. Use this when you need more than 10 related tools from a single service or complex OAuth flows that regular plugin tools can't handle cleanly.
npx skills add https://github.com/aiskillstore/marketplace --skill mcp-integration