import type { JsonObject, Message, ModelCapabilities, StructuredOutputOptions, ToolDefinition, Usage } from "../contracts.js";
export declare function assertOpenAIChatMessage(message: unknown, path: string): asserts message is Message;
export declare function serializeOpenAIChatStructuredOutput(options: StructuredOutputOptions): JsonObject;
export declare function serializeOpenAIResponsesStructuredOutput(options: StructuredOutputOptions): JsonObject;
export declare function applyOpenAIChatStructuredOutput(body: Record<string, unknown>, structuredOutput?: StructuredOutputOptions): void;
export declare function applyOpenAIResponsesStructuredOutput(body: Record<string, unknown>, structuredOutput?: StructuredOutputOptions): void;
export declare function serializeOpenAITool(tool: ToolDefinition): JsonObject;
export declare function serializeToolResultJson(message: Message): string;
export declare function serializeOpenAIChatMessage(message: Message, capabilities?: ModelCapabilities): JsonObject;
export declare function mapOpenAIChatUsage(usage: unknown): Usage | undefined;