Client Elicitation

When a server requests user input via elicitation, the client must present the form or URL to the user and return their response.

ElicitRequestParams is an untagged enum with two variants:

• ElicitRequestParams::FormParams(ElicitRequestFormParams) — message, requested_schema (and an optional mode)
• ElicitRequestParams::UrlParams(ElicitRequestUrlParams) — elicitation_id, message, url

async fn handle_elicit_request(
    &self, params: ElicitRequestParams, _runtime: &dyn McpClient,
) -> Result<ElicitResult, RpcError> {
    // For form mode, match on ElicitRequestParams::FormParams(form) and use
    // form.message / form.requested_schema to render the input UI.

    // In a real client, display the form to the user and collect input,
    // then map each field into an ElicitResultContent value
    Ok(ElicitResult {
        action: ElicitResultAction::Accept,
        content: Some(
            [
                (
                    "name".to_string(),
                    ElicitResultContent::Primitive(ElicitResultContentPrimitive::String(
                        "Alice".into(),
                    )),
                ),
                (
                    "email".to_string(),
                    ElicitResultContent::Primitive(ElicitResultContentPrimitive::String(
                        "alice@example.com".into(),
                    )),
                ),
            ]
            .into_iter()
            .collect(),
        ),
        meta: None,
    })
}

The client must declare the elicitation capability for this to work: elicitation: Some(ClientElicitation::default()) in ClientCapabilities.

For task-augmented elicitation, override handle_task_augmented_elicit_request and return a CreateTaskResult instead.