MCP C# SDK Tutorial: Production MCP in .NET with Hosting, ASP.NET Core, and Task Workflows

Learn how to build and operate MCP clients and servers with modelcontextprotocol/csharp-sdk, including package choices, auth patterns, tasks, diagnostics, and versioning strategy.

Why This Track Matters

The C# SDK is one of the strongest MCP implementations for enterprise .NET stacks, with first-class hosting/DI integration, ASP.NET Core transport support, and detailed concept docs.

This track focuses on:

• selecting the right package layer (ModelContextProtocol, .Core, .AspNetCore)
• implementing client/server patterns with host-friendly abstractions
• using filters, diagnostics, and versioning guidance for safer evolution
• deploying protected MCP endpoints with OAuth-compatible flows

Current Snapshot (auto-updated)

• repository: modelcontextprotocol/csharp-sdk
• stars: about 4.3k
• latest release: v1.3.0 (published 2026-05-08)

Mental Model

flowchart LR
    A[.NET host] --> B[ModelContextProtocol]
    B --> C[Stdio transports]
    A --> D[ModelContextProtocol.AspNetCore]
    D --> E[HTTP MCP endpoints]
    B --> F[Filters + diagnostics + tasks]

Chapter Guide

Chapter	Key Question	Outcome
01 - Getting Started and Package Selection	Which C# SDK package should I use for my app shape?	Correct package boundary
02 - Client/Server Hosting and stdio Basics	How do I stand up MCP clients and servers in typical .NET hosts?	Faster onboarding
03 - ASP.NET Core HTTP Transport and Session Routing	How do I design HTTP MCP deployments with route/session control?	Better HTTP architecture
04 - Tools, Prompts, Resources, and Filter Pipelines	How do I keep primitive behavior and interception predictable?	Cleaner extensibility
05 - Logging, Progress, Elicitation, and Tasks	How do advanced capabilities work end to end in C#?	Stronger feature execution
06 - OAuth-Protected MCP Servers and Clients	How do we secure MCP endpoints and clients in production?	Lower security risk
07 - Diagnostics, Versioning, and Breaking-Change Management	How do teams evolve safely while APIs are still moving?	Safer upgrade process
08 - Testing, Operations, and Contribution Workflows	How do we operationalize reliability and contribute upstream?	Long-term maintainability

What You Will Learn

• how to map package boundaries to real .NET deployment scenarios
• how to use filters, diagnostics, and concept docs as operational tools
• how to secure and test protected MCP deployments in ASP.NET Core
• how to handle preview-stage versioning with lower blast radius

Source References

• C# SDK README
• Docs Overview
• Concepts Index
• Core Package README
• AspNetCore Package README
• Versioning Policy
• Diagnostics List
• Protected Server Sample
• Protected Client Sample

Related Tutorials

• MCP Specification Tutorial
• MCP Go SDK Tutorial
• MCP Java SDK Tutorial
• MCP TypeScript SDK Tutorial

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Start with Chapter 1: Getting Started and Package Selection.

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Full Chapter Map

1. Chapter 1: Getting Started and Package Selection
2. Chapter 2: Client/Server Hosting and stdio Basics
3. Chapter 3: ASP.NET Core HTTP Transport and Session Routing
4. Chapter 4: Tools, Prompts, Resources, and Filter Pipelines
5. Chapter 5: Logging, Progress, Elicitation, and Tasks
6. Chapter 6: OAuth-Protected MCP Servers and Clients
7. Chapter 7: Diagnostics, Versioning, and Breaking-Change Management
8. Chapter 8: Testing, Operations, and Contribution Workflows

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