add-mcp-tool

name	add-mcp-tool
description	Use when add/edit of MCP Tools

MCP Tool implementation details

• Add MCP tool implementations in the TodoApp/MCP folder.
• Add a tool to an existing TodoApp/MCP/<Feature>McpTools.cs file when it belongs to the same feature; create a new <Feature>McpTools.cs file when introducing a new MCP feature surface.
• Keep MCP-specific response and payload records in TodoApp/MCP/<Feature>McpContracts.cs.
• Mark each tool container with [McpServerToolType].
• Add [McpServerTool(Name = McpToolNames.<ToolName>)] to each exposed tool method and include a clear Description(...).
• Keep MCP tool names centralized in TodoApp/Constants.cs under McpToolNames instead of magic strings.
• Use the existing business logic services for validation and orchestration instead of duplicating domain rules inside MCP tools.
• Map entities and command results into MCP-specific contract records before returning them from tool methods.
• Return typed values such as records, primitives, or IReadOnlyList<T> from tool methods instead of HTTP-specific results.
• Register each new MCP tool class in TodoApp/Program.cs with .WithTools<<Feature>McpTools>().
• Update TodoApp/API only when the user explicitly asks for the same capability over HTTP.