MCP C# SDK
The official C# SDK for Model Context Protocol servers and clients. Maintained by the Model Context Protocol project. 4,261 GitHub stars and 22 commits on main in the last 30 days.
“The official C# SDK for Model Context Protocol servers and clients. Maintained by the Model Context Protocol project. 4,261 stars and 22 commits on main in the last 30 days.”
INSTALL THIS SERVER
{
"mcpServers": {
"my-csharp-mcp-server": {
"command": "dotnet",
"args": [
"/path/to/my-csharp-mcp-server.dll"
]
}
}
}
{
"mcpServers": {
"my-csharp-mcp-server": {
"command": "dotnet",
"args": [
"/path/to/my-csharp-mcp-server.dll"
]
}
}
}
{
"mcpServers": {
"my-csharp-mcp-server": {
"command": "dotnet",
"args": [
"/path/to/my-csharp-mcp-server.dll"
]
}
}
}
{
"mcpServers": {
"my-csharp-mcp-server": {
"command": "dotnet",
"args": [
"/path/to/my-csharp-mcp-server.dll"
]
}
}
}
{
"mcpServers": {
"my-csharp-mcp-server": {
"command": "dotnet",
"args": [
"/path/to/my-csharp-mcp-server.dll"
]
}
}
}
5 TOOLS AVAILABLE
OUR ASSESSMENT
- 4,261 GitHub stars.
- 22 commits on main in the last 30 days.
- Maintained by the Model Context Protocol project.
- ASP.NET Core integration patterns.
- Supports all three MCP transports.
- Multi-licence repo during the documented MIT to Apache-2.0 transition; track for full Apache-2.0 cutover.
- API surface evolves with the protocol; pin NuGet versions in production.
- Smaller community than Python or TypeScript SDKs.
SDK has no auth by default. Servers built with the SDK must add authentication; ASP.NET Core middleware patterns work well for this.
C# and .NET developers building MCP servers; teams running ASP.NET Core stacks; enterprise shops that prefer the .NET runtime for production agents.
TECHNICAL DETAILS
ADOPTION METRICS
// Reading this4,261 stars on modelcontextprotocol/csharp-sdk. 22 commits on main in the last 30 days. LICENSE confirmed via direct inspection: MIT/Apache-2.0 transitioning posture.
// Reading thisPairs with MCP Python SDK, MCP TypeScript SDK, MCP Go SDK, mark3labs/mcp-go in the official MCP language layer.
SOURCES & VERIFICATION
We don't take any single directory's word for it. Before scoring, we cross-reference 5 public MCP sources, install the server ourselves against the clients we cover, and record when we last re-verified.
The same server, 5 different lenses. We reconcile these signals into our editorial score, which is why our number sometimes diverges from a directory-aggregate star count.
| Source | Their rating | Their star count | Their downloads | Last synced |
|---|---|---|---|---|
| AutomationSwitch This page | 4.5editorial | 4,261 | — | MAY 14, 2026 |
| PulseMCP | — unrated | unavailable | unavailable | MAY 14, 2026 |
| MCP.so | — unrated | unavailable | unavailable | MAY 14, 2026 |
| Glama | — unrated | unavailable | unavailable | MAY 14, 2026 |
| Smithery | — unrated | unavailable | unavailable | MAY 14, 2026 |
| Official MCP Registry | — unrated | unavailable | unavailable | MAY 14, 2026 |
// Counts are directory-reported; we don't adjust them. Discrepancies usually come from different snapshot times or star-caching.
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DISCUSS YOUR
MCP REQUIREMENTS.
Evaluating a server, scoping an internal deployment, or working out whether MCP is the right fit at all. Start the conversation and we will point you at the right piece of the ecosystem.