import type { AgentConfig } from './types.js';
/**
 * Save configuration
 */
export declare function saveConfig(config: AgentConfig): void;
/**
 * Set a specific config value
 */
export declare function setConfig<K extends keyof AgentConfig>(key: K, value: AgentConfig[K]): void;
/**
 * Update API key in config file after rotation
 * This directly modifies the config file without going through loadConfig
 * to avoid environment variable overrides being persisted.
 *
 * Also updates process.env.ZNVAULT_API_KEY to ensure subsequent
 * loadConfig() calls return the new key.
 */
export declare function updateApiKey(newKey: string): void;
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