import type { ChannelAdapter } from "#channel/adapter.js";
/**
 * Durable adapter kind used for delegated subagent child runs.
 *
 * Framework-owned — authored channel code never constructs a subagent
 * adapter directly. Emitted by `buildSubagentRunInput`
 * (`execution/subagent-tool.ts`) when a parent dispatches a child
 * subagent.
 */
export declare const SUBAGENT_ADAPTER_KIND = "subagent";
/**
 * Durable state carried on a subagent adapter instance.
 *
 * Populated by `buildSubagentRunInput` at dispatch time so the child
 * run retains the parent lineage metadata required to resume its parent
 * when the child finishes and to forward HITL requests up the chain.
 *
 * The parent's turn identifier is not duplicated here — it lives on
 * `RunInput.parent.turn.id` which is the single source of truth for the
 * child's parent-turn lineage.
 */
export interface SubagentAdapterState extends Record<string, unknown> {
    readonly callId: string;
    readonly parentContinuationToken: string;
    readonly parentSessionId: string;
    readonly subagentName: string;
}
/**
 * Narrow runtime guard for {@link SubagentAdapterState}.
 *
 * Framework adapters live through a JSON round-trip at every workflow
 * step boundary, so consumers that want to treat the adapter state as
 * a structured record must validate the shape explicitly.
 */
export declare function isSubagentAdapterState(value: unknown): value is SubagentAdapterState;
/**
 * Framework adapter that bridges a child subagent session to its
 * parent.
 *
 * It proxies child `input.requested` events upward so the parent channel
 * can render HITL prompts and route responses back down to the child.
 */
export declare const SUBAGENT_ADAPTER: ChannelAdapter;