/**
 * Subagent activity helpers — keep pending lane cards (`${toolCallId}#i`)
 * from hanging forever when call_agents / call_agent bails before A2A
 * attaches a jobId (cap, policy deny, aligning gate, validation, …).
 *
 * Stop is only shown when `jobId` is known (`resolveSubagentJobId`). A
 * pending card without a terminal update therefore looks like a stuck
 * Subagent with no Stop — the bug users hit after a second fan-out.
 */
import type { AgentSendOpts } from './types.js';
export type SubagentActivityEmit = NonNullable<AgentSendOpts['onToolActivity']>;
/** Count tasks[] for call_agents pending-lane cleanup. */
export declare function countCallAgentsTasks(input: unknown): number;
/** Label for lane i from call_agents input (best-effort). */
export declare function callAgentsLaneLabel(input: unknown, index: number): string;
/**
 * Mark every pending call_agents lane (`${toolCallId}#i`) failed/denied.
 * No-op when emit is missing or there are no tasks.
 */
export declare function failCallAgentsPendingLanes(emit: SubagentActivityEmit | undefined, opts: {
    toolCallId: string;
    input?: unknown;
    /** Explicit count when input is unavailable. */
    taskCount?: number;
    status?: 'error' | 'denied';
    preview: string;
    startedAt?: number;
}): void;
/** Mark a singular call_agent pending card (id = toolCallId) failed/denied. */
export declare function failCallAgentPendingLane(emit: SubagentActivityEmit | undefined, opts: {
    toolCallId: string;
    label?: string;
    status?: 'error' | 'denied';
    preview: string;
    startedAt?: number;
}): void;
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