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Csharp SDK
modelcontextprotocol/csharp-sdk
The official C# SDK for Model Context Protocol servers and clients. Maintained in collaboration with Microsoft.
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.github/skills/breaking-changesbump-versionAssess and bump the SDK version using Semantic Versioning 2.0.0. Evaluates queued changes to recommend PATCH/MINOR/MAJOR, updates src/Directory.Build.props, and creates a pull request. Owns the SemVer assessment logic shared by prepare-release and publish-release. Use when asked to bump the version,.github/skills/bump-versionissue-triageGenerate an issue triage report for the C# MCP SDK. Fetches all open issues, evaluates SLA compliance against SDK tier requirements, reviews issue discussions for status and next steps, cross-references related issues in other MCP SDK repos, and produces a BLUF markdown report. Use when asked to tri.github/skills/issue-triageprepare-releasePrepare a new release for the C# MCP SDK. Assesses Semantic Versioning level (PATCH/MINOR/MAJOR), bumps the version, runs ApiCompat and ApiDiff, reviews documentation, updates changelogs, drafts release notes, and creates a pull request with all release artifacts. Use when asked to prepare a release.github/skills/prepare-releasepublish-releasePublish a GitHub release for the C# MCP SDK after a prepare-release PR has been merged. Refreshes release notes to include any PRs merged since preparation, warns about version or breaking change impacts from late-arriving PRs, and creates a draft GitHub release. Use when asked to publish a release,.github/skills/publish-releaserun-conformance-from-branchRun MCP conformance tests in the C# SDK against a conformance branch (including forks) instead of the published npm version, then restore pinned dependencies..github/skills/run-conformance-from-branchverify-releaseVerify a published release of the C# MCP SDK. Monitors the Release and Publish Docs workflows triggered by publishing a GitHub release, confirms the packages are listed on NuGet.org, and confirms the versioned documentation site reflects the release. Use when asked to verify a release, check whether.github/skills/verify-releasegit-workflowFollow this team's Git conventions for branching, commit messages, and pull requests.samples/SkillsServer/Skills/git-workflowrefundsProcess customer refund requests per company policy.samples/SkillsServer/Skills/refundsDocumentation
README
MCP C# SDK
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.
Packages
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.Skills
- MCP Skills extension for serving and consuming Agent Skills with verifiable file manifests.ModelContextProtocol.Extensions.Tasks
- MCP Tasks extension for running long-running tool invocations asynchronously with status polling and input requests.
Getting Started
To get started, see the Getting Started guide in the conceptual documentation for installation instructions, package-selection guidance, and complete examples for both clients and servers.
You can also browse the samples directory and the API documentation for more details on available functionality.
About MCP
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:
Cross-Application Access (Identity Assertion Authorization Grant flow)
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.
License
This project is licensed under the Apache License 2.0.
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