Build production-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use this skill when the user wants to create, scaffold, or implement an MCP server for any API or service, in any language. Triggers include requests to "build an MCP server", "create MCP tools", "implement MCP", "add tools for [service]", "connect [service] via MCP", or any task involving MCP server development, tool design, or MCP architecture decisions.