csharp-sdk

Breaking Changes

The 0.8.0-preview.1 release includes breaking API changes as we continue to refine the API surface area for the path toward a 1.0.0 stable release.

• Seal public Protocol reference types to prevent external inheritance by @Copilot in https://github.com/modelcontextprotocol/csharp-sdk/pull/1232 https://github.com/modelcontextprotocol/csharp-sdk/labels/breaking-change

W...

What's Changed

• chore: update licensing to Apache 2.0 for new contributions by @domdomegg in https://github.com/modelcontextprotocol/csharp-sdk/pull/1140
• Streamable HTTP resumability + redelivery + SSE polling via server-side disconnect by @MackinnonBuck in https://github.com/modelcontextprotocol/csharp-sdk/pull/1077
• Add 2025-11-25 as supported version by @Copilot in https://github.com/...

What's Changed

• Remove s_additionalProperties from McpClientTool by @Copilot in https://github.com/modelcontextprotocol/csharp-sdk/pull/1080
• Migrate from Anthropic.SDK to official Anthropic package by @Copilot in https://github.com/modelcontextprotocol/csharp-sdk/pull/1083
• Improve caching in XmlToDescriptionGenerator by @stephentoub in https://github.com/modelcontextprotocol/csharp-sdk/...

Breaking Changes

The 0.5.0-preview.1 release includes several categories of breaking changes as we continue to refine the API surface area for the path toward a 1.0.0 stable release. Refer to the C# SDK Versioning documentation for information regarding our versioning, breaking change, and support approaches.

1. **[Add req...

Breaking Changes

The v0.4.1-preview.1 release includes breaking changes included in #892 and #969.

1. #892 audits and standardizes MCP protocol types for consistency, including API changes for:
2. Property mutability
3. Required properties
4. Collection types used for properties
5. #969 implements [SEP-1330: Elicitation Enum Schema Improvements and Standards Compliance](https://gi...