/**
 * SubAgentHandler — delegates a task to a named sub-agent from the registry.
 *
 * Reads:  `ctx.inputText` (default task template), `ctx.sessionId`, `ctx.options`
 * Writes: `ctx.subResults.<agent>` (or custom path via `config.outputTo`)
 *
 * Stage config:
 *   agent:    string  — registry key (required)
 *   task:     string  — Handlebars-style template for the task; defaults to '{{inputText}}'
 *   outputTo: string  — dot-path to write result output; defaults to `subResults.<agent>`
 */
import type { SubAgentRegistry } from '@mcp-abap-adt/llm-agent';
import type { ISpan } from '../../tracer/types.js';
import type { PipelineContext } from '../context.js';
import type { IStageHandler } from '../stage-handler.js';
export declare class SubAgentHandler implements IStageHandler {
    private readonly registry;
    constructor(registry: SubAgentRegistry);
    execute(ctx: PipelineContext, rawConfig: Record<string, unknown>, _span: ISpan): Promise<boolean>;
}
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