/**
 * Progress notification service for MCP tools.
 *
 * Provides a lightweight abstraction over MCP's stable `notifications/progress`
 * mechanism. Tool functions accept an optional `ProgressReporter` to emit
 * per-step progress without depending on the full `RequestHandlerExtra` type.
 */
export interface ProgressReporter {
    /** Report that step `current` of `total` is done, with an optional status message. */
    report(current: number, total: number, message?: string): Promise<void>;
    /** Whether the client actually requested progress (sent a progressToken). */
    readonly enabled: boolean;
}
/**
 * Creates a `ProgressReporter` from an MCP tool handler's `extra` parameter.
 *
 * If the client did not include a `progressToken` in `_meta`, the returned
 * reporter is a no-op (`.enabled === false`), so callers can always call
 * `progress.report()` unconditionally.
 *
 * @param progressToken   Value of `extra._meta?.progressToken`
 * @param sendNotification  Value of `extra.sendNotification` — typed loosely to
 *   avoid coupling to SDK's strict discriminated union. At runtime the SDK
 *   accepts any valid JSON-RPC notification including `notifications/progress`.
 */
export declare function createProgressReporter(progressToken: string | number | undefined, sendNotification: (notification: any) => Promise<void>): ProgressReporter;
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