/**
 * Single-turn, tool-less LLM completion helper shared by the derive and
 * evaluate steps. Wraps pi-agent-core's Agent + pi-ai's streamSimple, the same
 * primitives pi-memory uses for background work.
 */
import type { GoalModelConfig } from './config.js';
/** Minimal slice of ctx.modelRegistry we depend on (kept narrow for testability). */
export interface GoalModelRegistry {
    find(provider: string, model: string): unknown;
    getApiKeyAndHeaders(model: unknown): Promise<{
        ok: boolean;
        apiKey?: string;
        headers?: Record<string, string>;
        error?: string;
    }>;
}
/**
 * Run one system+user prompt through the model and return the assistant's text.
 * Returns null on any resolution/auth failure so callers can degrade gracefully
 * (never throws for expected failures).
 */
export declare function completeOnce(registry: GoalModelRegistry, modelConfig: GoalModelConfig, systemPrompt: string, userPrompt: string, signal?: AbortSignal): Promise<string | null>;
//# sourceMappingURL=llm.d.ts.map