support MCP elicitations (#6947)

No support for request schema yet, but we'll at least show the message
and allow accept/decline.

<img width="823" height="551" alt="Screenshot 2025-11-21 at 2 44 05 PM"
src="https://github.com/user-attachments/assets/6fbb892d-ca12-4765-921e-9ac4b217534d"
/>

codex-rs/rmcp-client/src/logging_client_handler.rs

@@ -1,13 +1,15 @@
+use std::sync::Arc;
+
 use rmcp::ClientHandler;
 use rmcp::RoleClient;
 use rmcp::model::CancelledNotificationParam;
 use rmcp::model::ClientInfo;
 use rmcp::model::CreateElicitationRequestParam;
 use rmcp::model::CreateElicitationResult;
-use rmcp::model::ElicitationAction;
 use rmcp::model::LoggingLevel;
 use rmcp::model::LoggingMessageNotificationParam;
 use rmcp::model::ProgressNotificationParam;
+use rmcp::model::RequestId;
 use rmcp::model::ResourceUpdatedNotificationParam;
 use rmcp::service::NotificationContext;
 use rmcp::service::RequestContext;
@@ -16,32 +18,36 @@ use tracing::error;
 use tracing::info;
 use tracing::warn;
 
-#[derive(Debug, Clone)]
+use crate::rmcp_client::SendElicitation;
+
+#[derive(Clone)]
 pub(crate) struct LoggingClientHandler {
     client_info: ClientInfo,
+    send_elicitation: Arc<SendElicitation>,
 }
 
 impl LoggingClientHandler {
-    pub(crate) fn new(client_info: ClientInfo) -> Self {
-        Self { client_info }
+    pub(crate) fn new(client_info: ClientInfo, send_elicitation: SendElicitation) -> Self {
+        Self {
+            client_info,
+            send_elicitation: Arc::new(send_elicitation),
+        }
     }
 }
 
 impl ClientHandler for LoggingClientHandler {
-    // TODO (CODEX-3571): support elicitations.
     async fn create_elicitation(
         &self,
         request: CreateElicitationRequestParam,
-        _context: RequestContext<RoleClient>,
+        context: RequestContext<RoleClient>,
     ) -> Result<CreateElicitationResult, rmcp::ErrorData> {
-        info!(
-            "MCP server requested elicitation ({}). Elicitations are not supported yet. Declining.",
-            request.message
-        );
-        Ok(CreateElicitationResult {
-            action: ElicitationAction::Decline,
-            content: None,
-        })
+        let id = match context.id {
+            RequestId::String(id) => mcp_types::RequestId::String(id.to_string()),
+            RequestId::Number(id) => mcp_types::RequestId::Integer(id),
+        };
+        (self.send_elicitation)(id, request)
+            .await
+            .map_err(|err| rmcp::ErrorData::internal_error(err.to_string(), None))
     }
 
     async fn on_cancelled(