/** Public API contract for hosted child stream watchdog phase. */
export type HostedChildStreamWatchdogPhase = "tool_running" | "post_tool_idle" | "generic_idle";
/** State for hosted child stream watchdog. */
export interface HostedChildStreamWatchdogState {
    phase: HostedChildStreamWatchdogPhase;
    timeoutMs: number;
}
/** Error shape for hosted child stream idle timeout. */
export declare class HostedChildStreamIdleTimeoutError extends Error {
    readonly timeoutMs: number;
    readonly phase: HostedChildStreamWatchdogPhase;
    constructor(input: HostedChildStreamWatchdogState);
}
/** Shared hosted child stream timeout token value. */
export declare const HOSTED_CHILD_STREAM_TIMEOUT_TOKEN: unique symbol;
/** State for resolve hosted child stream watchdog. */
export declare function resolveHostedChildStreamWatchdogState(input: {
    activeToolCallId: string | null;
    completedToolResults: number;
    idleTimeoutMs: number;
    activeToolTimeoutMs: number;
    postToolIdleTimeoutMs: number;
}): HostedChildStreamWatchdogState;
/** Compose abort signals helper. */
export declare function composeAbortSignals(signals: Array<AbortSignal | undefined>): AbortSignal | undefined;
/** Applies hosted child stream idle timeout. */
export declare function withHostedChildStreamIdleTimeout<T>(input: {
    stream: AsyncIterable<T>;
    getWatchdogState: () => HostedChildStreamWatchdogState;
    abortSignal?: AbortSignal;
    onIdleTimeout?: (state: HostedChildStreamWatchdogState) => undefined | "continue" | Promise<undefined | "continue">;
}): AsyncGenerator<T, void, void>;
/** Resolves hosted child promise with timeout. */
export declare function resolveHostedChildPromiseWithTimeout<T>(promise: PromiseLike<T>, timeoutMs: number): Promise<T | typeof HOSTED_CHILD_STREAM_TIMEOUT_TOKEN>;
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