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Add explicit [Experimental] protected constructors to McpClient and McpServer (#1363)

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
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Co-authored-by: Jeff Handley <jeffhandley@users.noreply.github.com>
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Copilot 2026-02-23 21:37:39 -05:00 • committed by GitHub
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@ -24,6 +24,7 @@ If you use experimental APIs, you will get one of the diagnostics shown below. T
| Diagnostic ID | Description |
| :------------ | :---------- |
| `MCPEXP001` | MCP experimental APIs including Tasks and Extensions. Tasks provide a mechanism for asynchronous long-running operations that can be polled for status and results (see [MCP Tasks specification](https://modelcontextprotocol.io/specification/draft/basic/utilities/tasks)). Extensions provide a framework for extending the Model Context Protocol while maintaining interoperability (see [SEP-2133](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133)). |
| `MCPEXP002` | Subclassing `McpClient` and `McpServer` is experimental and subject to change (see [#1363](https://github.com/modelcontextprotocol/csharp-sdk/pull/1363)). |
## Obsolete APIs
@ -34,4 +35,4 @@ When APIs are marked as obsolete, a diagnostic is emitted to warn users that the
| Diagnostic ID | Status | Description |
| :------------ | :----- | :---------- |
| `MCP9001` | In place | The `EnumSchema` and `LegacyTitledEnumSchema` APIs are deprecated as of specification version 2025-11-25. Use the current schema APIs instead. |
| `MCP9002` | Removed | The `AddXxxFilter` extension methods on `IMcpServerBuilder` (e.g., `AddListToolsFilter`, `AddCallToolFilter`, `AddIncomingMessageFilter`) were superseded by `WithRequestFilters()` and `WithMessageFilters()`. |
| `MCP9002` | Removed | The `AddXxxFilter` extension methods on `IMcpServerBuilder` (e.g., `AddListToolsFilter`, `AddCallToolFilter`, `AddIncomingMessageFilter`) were superseded by `WithRequestFilters()` and `WithMessageFilters()`. |