"$schema" is removed from elicitation requests, despite being supported since MCP 2025-11-25

These lines remove the $schema json property

https://github.com/spring-projects/spring-ai/blob/e6feadb74bf407e94a96dc47cf5e4e405fa18838/mcp/mcp-annotations/src/main/java/org/springframework/ai/mcp/annotation/context/DefaultMcpAsyncRequestContext.java#L164-L169

but it actually is supported since version 2025-11-25 (including the recent 2026 release)

https://modelcontextprotocol.io/specification/2025-11-25/schema#elicitrequestformparams

interface ElicitRequestFormParams {
  task?: TaskMetadata;
  _meta?: { progressToken?: ProgressToken; [key: string]: unknown };
  mode?: "form";
  message: string;
  requestedSchema: {
    $schema?: string;  // <<<< here
    type: "object";
    properties: { [key: string]: PrimitiveSchemaDefinition };
    required?: string[];
  };
}

This seems to be an unintentional holdover from 2025-06-18 when the interface was this
https://modelcontextprotocol.io/specification/2025-06-18/schema#elicitrequest

interface ElicitRequest {
  method: "elicitation/create";
  params: {
    message: string;
    requestedSchema: {
      type: "object";
      properties: { [key: string]: PrimitiveSchemaDefinition };
      required?: string[];
    };
  };
}

Start in mcp/mcp-annotations/src/main/java/org/springframework/ai/mcp/annotation/context/DefaultMcpAsyncRequestContext.java at the cited lines and compare the request shape with the MCP 2025-11-25 ElicitRequestFormParams schema. Ensure elicitation requests preserve the optional $schema property, then verify the relevant request output or tests if available.