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The Art of Simplicity

Model Context Protocol (MCP) servers can use two transport mechanisms: STDIO (local process communication via stdin/stdout) and hosted servers (HTTP/SSE endpoints). For hosted MCP servers in C#, parameters are passed through URLs, query strings, or headers rather than environment variables. The article demonstrates extracting URL route parameters in an ASP.NET Core MCP server using IHttpContextAccessor and a ProjectContext abstraction, enabling multiple server instances scoped to different Azure DevOps projects and teams. Best practices include secure credential management, proper URL encoding, parameter validation, and robust error handling.

Passing parameters to a hosted MCP Server in C#

Extract parameters in your C# based MCP server