MCP100 verdict
Recommended official MCP SDK for C# / .NET when you need direct, first-party protocol support for building MCP clients or servers.
MCP100 Assessment
Editorial verdict
Reviewed September 11, 2026
Task Fit
Mapped
Developer workflows
Trust
Reviewed
A dated editorial review is published on the MCP detail page.
Maintenance
Activity observed
A dated repository or package update is available; editorial maintenance review is still pending.
Popularity
Signals available
Visible usage signals are shown for discovery only, not as proof of safety.
Evidence scope
4.5k MCP repository stars
No MCP-specific package metric is stored
Repository identity: modelcontextprotocol/csharp-sdk
Package identity: ModelContextProtocol
Stars observed September 24, 2026 · Downloads observation date unavailable
Exact reviewed repository identity; current GitHub repository stars are eligible as repository-level adoption evidence.
The official C# SDK publishes through NuGet; this snapshot has no comparable supported NuGet download metric.
Publisher activity observed September 21, 2026
Current source snapshot
Source relationship: First-party MCP
Reviewed September 11, 2026
Evidence-backed setup
This profile has type-appropriate, source-backed setup rather than an MCP-server client connector configuration.
Type-appropriate, source-backed setup for this sdk profile.
Capability
Recommended official MCP SDK for C# / .NET when you need direct, first-party protocol support for building MCP clients or servers.
First-party C# protocol primitives for exposing MCP server capabilities.
First-party C# client primitives for connecting to MCP servers.
Use the current official SDK line for MCP negotiation, requests, notifications, and supported transports.
This is an SDK, not a fixed MCP server tool catalog.
Not measured yet
Estimated token footprint of the MCP tool schemas exposed to the agent.
Reviewed access
Review the exact access boundary before connecting this MCP to accounts, credentials, or sensitive data.
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Work with repositories, issues, pull requests, and GitHub workflows.
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Choose GitHub MCP instead if repository, issue, pull-request, and code context.
Work with repositories, issues, pull requests, and GitHub workflows.
reviewed-detail:official-mcp-csharp-sdk is listed as First-party MCP in MCP100’s current evidence.
Current official resources:
Original product, capability, tool, and usage documentation from the MCP publisher. Installation sections appear under Install & Agents.
The official C# SDK for the Model Context Protocol, enabling .NET applications, services, and libraries to implement and interact with MCP clients and servers. Please visit the API documentation for more details on available functionality.
The SDK packages are:
ModelContextProtocol.Core - For projects that only need to use the client or low-level server APIs and want the minimum number of dependencies.
ModelContextProtocol - The main package with hosting and dependency injection extensions. References ModelContextProtocol.Core. This is the right fit for most projects that don't need HTTP server capabilities.
ModelContextProtocol.AspNetCore - The library for HTTP-based MCP servers. References ModelContextProtocol.
ModelContextProtocol.Extensions.Apps - MCP Apps extension for building interactive UI applications that render inside MCP hosts.
ModelContextProtocol.Extensions.Tasks - MCP Tasks extension for running long-running tool invocations asynchronously with status polling and input requests.
The Model Context Protocol (MCP) is an open protocol that standardizes how applications provide context to Large Language Models (LLMs). It enables secure integration between LLMs and various data sources and tools.
For more information about MCP:
The SDK provides support for the Identity Assertion Authorization Grant flow
via IdentityAssertionGrantProvider. See the Cross-Application Access section in the transport docs for full usage details.
This project is licensed under the Apache License 2.0.