/**
 * #387: one lifecycle step of a native Claude subagent (a `Task`/`Agent` tool
 * call), carried on an `AgentMessage` of type `'subagent'` and forwarded by
 * agent-exec.ts as the protocol's `subagent` event (doc/agent-exec-protocol.md
 * §3.2.1). `id` is the SDK's task_id; `tool_use_id` is the id of the `Task`/
 * `Agent` tool call that started it, i.e. the matching `tool_activity` id.
 */
export interface SubagentEvent {
    phase: 'started' | 'progress' | 'finished';
    id: string;
    tool_use_id: string;
    subagent_type?: string;
    description?: string;
    prompt?: string;
    summary?: string;
    last_tool?: string;
    status?: string;
    /** The SDK's own task usage, passed through as-is — it reports a token
     *  total, not an input/output split, and no cost. */
    usage?: {
        total_tokens: number;
        tool_uses: number;
        duration_ms: number;
    };
}
/**
 * Map the Agent SDK's `system` task messages (`task_started`,
 * `task_progress`, `task_notification`; sdk.d.ts SDKTask*Message) to
 * SubagentEvents. Stateful per turn: a later message may omit `tool_use_id`,
 * so it is remembered from `task_started`; a task that was never started here
 * — no tool call to join to, or an ambient `skip_transcript` housekeeping
 * task — is dropped at every phase. Returns undefined for anything else.
 */
export declare function createSubagentTracker(): (m: any) => SubagentEvent | undefined;
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