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Implement SEP-1330: Standards-compliant enum schemas for elicitation (#969)

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
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Copilot 2025-11-19 22:51:02 -05:00 • committed by GitHub
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9
docs/concepts/elicitation/elicitation.md
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@ -16,9 +16,16 @@ The C# SDK registers an instance of <xref:ModelContextProtocol.Server.McpServer>
so tools can simply add a parameter of type <xref:ModelContextProtocol.Server.McpServer> to their method signature to access it.
The MCP Server must specify the schema of each input value it is requesting from the user.
Only primitive types (string, number, boolean) are supported for elicitation requests.
Primitive types (string, number, boolean) and enum types are supported for elicitation requests.
The schema may include a description to help the user understand what is being requested.
For enum types, the SDK supports several schema formats:
- **UntitledSingleSelectEnumSchema**: A single-select enum where the enum values serve as both the value and display text
- **TitledSingleSelectEnumSchema**: A single-select enum with separate display titles for each option (using JSON Schema `oneOf` with `const` and `title`)
- **UntitledMultiSelectEnumSchema**: A multi-select enum allowing multiple values to be selected
- **TitledMultiSelectEnumSchema**: A multi-select enum with display titles for each option
- **LegacyTitledEnumSchema** (deprecated): The legacy enum schema using `enumNames` for backward compatibility
The server can request a single input or multiple inputs at once.
To help distinguish multiple inputs, each input has a unique name.