/**
 * Model context window sizes (in tokens) for various LLM providers.
 * These values represent the maximum context length each model can handle.
 */
export declare const MODEL_CONTEXT_WINDOWS: Record<string, number>;
/**
 * Default context window size when model is not found in the mapping
 */
export declare const DEFAULT_CONTEXT_WINDOW = 128000;
/**
 * Set custom model context windows to extend or override the default mapping
 * @param customWindows - Custom model to context window mapping
 */
export declare function setCustomModelContextWindows(customWindows: Record<string, number>): void;
/**
 * Get the context window size for a given model
 * @param modelId - The model identifier (e.g., 'gpt-4o', 'claude-3-5-sonnet')
 * @param userMaxTokens - Optional user-specified max tokens to override the default
 * @returns The context window size in tokens
 *
 * @example
 * ```typescript
 * const contextWindow = getModelContextWindow('gpt-4o');
 * // Returns: 128000
 *
 * const customWindow = getModelContextWindow('gpt-4o', 50000);
 * // Returns: 50000 (user override)
 * ```
 */
export declare function getModelContextWindow(modelId: string, userMaxTokens?: number): number;