/**
 * Silent handoff: a transfer between agents should read as one continuous
 * assistant to the user. The transfer itself is already a silent control tool
 * call, but the TARGET agent's own instructions may tell it to introduce itself
 * ("Bill here"), which leaks the switch. On a silent handoff we append a strong
 * continuation directive to the target's system prompt so it does not greet or
 * re-introduce — mirroring the OpenAI Agents SDK's `nest_handoff_history`
 * context-note approach. Off (visible handoff) leaves the target's instructions
 * untouched.
 */
import type { Instructions } from '../types/agentConfig.js';
export declare const HANDOFF_CONTINUATION_DIRECTIVE: string;
/**
 * Append the continuation directive to a target agent's instructions on a silent
 * handoff. Handles every `Instructions` form: a string is suffixed; a (sync)
 * function is wrapped so the directive is appended to its resolved text; an
 * `AgentPrompt` object is left untouched (it cannot be safely suffixed, and is
 * rare as a base layer); `undefined` yields the directive alone.
 */
export declare function applyHandoffContinuation(base: Instructions | undefined): Instructions;