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Remove ExperimentalAttribute from official Extensions/Tasks/MRTR APIs and align MCPEXP001 usage (#1642)

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Copilot 2026-06-25 13:47:14 -07:00 • committed by GitHub
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docs/list-of-diagnostics.md
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@ -27,7 +27,7 @@ If you use experimental APIs, you will get one of the diagnostics shown below. T
| Diagnostic ID | Description |
| :------------ | :---------- |
| `MCPEXP001` | Experimental APIs for features in the MCP specification itself, including Tasks and Extensions. Tasks provide a mechanism for asynchronous long-running operations that can be polled for status and results (see [SEP-2663](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/seps/2663-tasks-extension.md)). Extensions provide a framework for extending the Model Context Protocol while maintaining interoperability (see [SEP-2133](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133)). |
| `MCPEXP001` | Experimental APIs tied to MCP specification features. Reuse this ID for newly introduced experimental spec features, and add feature-specific messages/URLs in `Experimentals`. |
| `MCPEXP002` | Experimental SDK APIs unrelated to the MCP specification itself, including subclassing `McpClient`/`McpServer` (see [#1363](https://github.com/modelcontextprotocol/csharp-sdk/pull/1363)) and `RunSessionHandler`, which may be removed or change signatures in a future release (consider using `ConfigureSessionOptions` instead). |
| `MCPEXP003` | Experimental MCP Apps extension APIs. MCP Apps is the first official MCP extension (`io.modelcontextprotocol/ui`), enabling servers to deliver interactive UIs inside AI clients (see [MCP Apps specification](https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/2026-01-26/apps.mdx)). |