import type { ExtensionError, ExtensionUIContext } from "../extensibility/extensions/types";
import type { AgentSession } from "../session/agent-session";
/** Action name for an extension-originated send failure. */
export type ExtensionSendAction = "extension_send" | "extension_send_user";
export interface InitializeExtensionsOptions {
    /** Reports an error thrown by an extension-initiated send. */
    reportSendError: (action: ExtensionSendAction, error: Error) => void;
    /** Reports a runtime error surfaced through {@link ExtensionRunner.onError}. */
    reportRuntimeError: (error: ExtensionError) => void;
    /** Optional shutdown hook (rpc mode signals its loop; print mode is a no-op). */
    onShutdown?: () => void;
    /** Optional UI context (rpc supplies one; print runs headless). */
    uiContext?: ExtensionUIContext;
}
/**
 * Initialize the session's extension runner with the standard action set
 * shared by non-interactive modes, then emit `session_start`.
 *
 * No-op when the session was constructed without an extension runner.
 */
export declare function initializeExtensions(session: AgentSession, options: InitializeExtensionsOptions): Promise<void>;