/**
 * Message Part Types
 */
export declare const PART_TYPES: {
    readonly TEXT: "text";
    readonly REASONING: "reasoning";
    readonly TOOL_CALL: "tool_call";
    readonly TOOL_RESULT: "tool_result";
    /** Anthropic-style tool reference */
    readonly TOOL: "tool";
    /** Anthropic-style tool invocation */
    readonly TOOL_USE: "tool_use";
};
