/**
 * Shared helpers for model providers.
 * Keep vendor adapters thin: map messages/tools here, call the SDK, return ModelResponse.
 */
import type { ModelRequest } from "../types";
/** Append JSON-only instruction when the agent expects structured output. */
export declare function buildSystemPrompt(request: ModelRequest): string;
/** Parse a JSON object string; return {} on failure (never throws). */
export declare function parseJsonObject(raw: string | undefined | null): unknown;
/**
 * Resolve an API key from config or env. Never log the returned value.
 * Throws a clear error if missing (safe for callers — message has no secret).
 */
export declare function requireApiKey(explicit: string | undefined, envKeys: string[], providerLabel: string): string;
export declare function errorMessage(err: unknown): string;
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