Add app-rendered elicitation MRTR example

[krubenok]

Summary

• add a self-verifying 2026-07-28 example of using an MCP App as the UI for a standard form elicitation
• negotiate the feature as elicitation: {} inside the existing io.modelcontextprotocol/ui extension on both peers
• attach _meta.ui.resourceUri only when the request-scoped client capabilities support app rendering
• use the SDK's existing MRTR engine to return InputRequiredResult, collect the standard ElicitResult, and retry with inputResponses

Design

This deliberately does not add a second extension package, custom method, or custom result type.

The example server publishes a self-contained text/html;profile=mcp-app resource and embeds an ordinary form-mode elicitation/create request in InputRequiredResult. The headless example client verifies two-sided negotiation, reads the bound app resource over the same connection, returns a standard ElicitResult, and lets the SDK perform the MRTR retry.

A graphical host replaces the deterministic selection with its MCP Apps View↔Host bridge; the core wire flow is unchanged. The Apps bridge continues to negotiate its own protocol version independently of core MCP 2026-07-28.

Related proposals:

• MCP Apps draft: Add app-rendered elicitations to the MCP Apps draft ext-apps#733
• Core SEP: SEP-3118: App-Rendered Elicitations for MCP Apps modelcontextprotocol#3118
• C# SDK: Add app-rendered elicitation support to MCP Apps csharp-sdk#1723
• Inspector reference: Add app-rendered elicitation reference implementation krubenok/inspector#1

Validation

• pnpm --filter @mcp-examples/apps-elicitation client
• example ESLint check
• repository pre-push build, typecheck, snippet-sync, and lint checks

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Latest commit: 59c1b61

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