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title Defining MCP server inputs using server.json
description Use the server.json metadata file to define CLI arguments and environment variables needed by your MCP server
author joelverhagen
ms.author jver
ms.topic conceptual
ms.date 07/23/2025

NOT DONE YET

Defining MCP server inputs using server.json

Anatomy of an MCP server package

An MCP server NuGet package is a .NET tool package with two extra things:

  1. A package type McpServer, in additional to the DotnetTool package type present on all .NET tool packages.
  2. An embedded .mcp/server.json file used for declaring inputs.

An MCP server package will contain your tool assembly (containing the Program entry point) as well as all of your dependencies. Depending on whether you made platform-specific packages, the MCP server package may be split into several platform-specific child packages. See the runtime requirements section for more information.