/**
 * Loop Engineering parent-agent gate.
 *
 * Loop orchestration (call_agents / loop_verdict / dispatch+verify gates)
 * only exists on Agim Agent. CLI backends (Codex, Claude Code, …) may still
 * run as Subagents via call_agents, but must not be the Loop parent —
 * they lack those tools, and packing history+Loop snippets into spawn argv
 * often hits kernel E2BIG ("Agent error: spawn E2BIG").
 */
/** True when this sticky/default agent can parent a Loop. */
export declare function canParentLoop(agentId: string | undefined | null): boolean;
/** Non-Agim sticky agents are valid Loop Subagent / preferred-worker targets. */
export declare function isLoopWorkerAgent(agentId: string | undefined | null): boolean;
/**
 * Update session.preferredWorkerAgent across sticky switches:
 * - selecting a CLI → that CLI becomes the preferred Loop worker
 * - switching CLI → Agim → keep the previous CLI as preferred worker
 * - Agim → Agim → leave stored preference unchanged
 */
export declare function nextPreferredWorkerAgent(previousAgent: string | undefined | null, newAgent: string, stored?: string | undefined | null): string | undefined;
/** Resolve which CLI (if any) Loop should prefer in call_agents. */
export declare function resolvePreferredWorkerAgent(stickyAgent: string | undefined | null, stored?: string | undefined | null): string | undefined;
export declare function formatLoopParentRequired(agentId: string | undefined | null, lang?: 'zh' | 'en'): string;
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