The official C# SDK for Model Context Protocol servers and clients. Maintained in collaboration with Microsoft.
Latest release v2.3.0 · 20 Oct 2026
9 files for Claude Code, GitHub Copilot and Codex: release-manager, csharp-sdk copilot-instructions.md, breaking-changes, bump-version and 5 more — 4,265 tokens loaded in every session.
.github/copilot-instructions.md A 4,265 tok .github/skills/breaking-changes/SKILL.md A 68 tok .github/skills/bump-version/SKILL.md A 84 tok .github/skills/issue-triage/SKILL.md B 82 tok .github/skills/prepare-release/SKILL.md A 88 tok .github/skills/publish-release/SKILL.md A 87 tok .github/skills/run-conformance-from-branch/SKILL.md A 38 tok .github/skills/verify-release/SKILL.md A 87 tok .github/agents/release-manager.agent.md A 317 tok These files are modelcontextprotocol/csharp-sdk's own configuration — they tell Claude Code, GitHub Copilot and Codex how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.