/**
 * Sub-agent start briefing (change: add-agent-loop-hooks-subagents-codex-pi).
 *
 * Claude Code's `SubagentStart` event names the sub-agent's type but not its task, so the task is
 * taken from the parent's `Agent` (or `Task`) tool call: the `before-subagent` moment queues the
 * prompt, and `subagent-start` takes it only when it is the ONE queued task of that session and
 * agent type: two parallel calls of one type (whose hooks race), a call that was denied, or a
 * sub-agent no Agent call started (a forked skill) would otherwise get another agent's task, which
 * misdirects it. In those cases the sub-agent gets the peers only.
 * The briefing is the task-scoped `orient` injection for that prompt plus the live peers on the
 * footprint board. Prompts are kept only in `.openlore/session-ledger/` (never committed), with
 * credentials redacted, for at most {@link TASK_TTL_MS} (a denied or never-started call's task
 * ages out quickly).
 */
/** A queued task not taken by a starting sub-agent within this long is dropped. */
export declare const TASK_TTL_MS: number;
/** Queue the task of a sub-agent about to start (the parent's `Agent` tool call). */
export declare function queueSubagentTask(root: string, task: {
    sessionId?: string;
    agentType?: string;
    prompt: string;
}): Promise<void>;
/**
 * Take the task of a starting sub-agent: only when exactly one live task is queued for its session
 * (or, without a session id on either side, none) and agent type. Ambiguous or absent: undefined,
 * and the queue is left to age out.
 */
export declare function takeSubagentTask(root: string, starting: {
    sessionId?: string;
    agentType?: string;
}): Promise<string | undefined>;
/** The briefing a starting sub-agent receives, within `budgetChars`; empty when there is nothing to say. */
export declare function subagentBriefing(root: string, prompt: string | undefined, budgetChars: number): Promise<string>;
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