/**
 * LangChain v1.0 Usage Metadata Interface
 * Represents token usage information returned by LLM providers
 *
 * @see https://js.langchain.com/docs/how_to/chat_token_usage_tracking/
 */
export interface UsageMetadata {
    /**
     * Number of tokens used in the input/prompt
     */
    input_tokens: number;
    /**
     * Number of tokens generated in the output/completion
     */
    output_tokens: number;
    /**
     * Total tokens used (input + output)
     */
    total_tokens: number;
}
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