export type McpServerEntry = {
    command: string;
    args: string[];
    env?: Record<string, string>;
};
/**
 * Merges or replaces `mcpServers[serverName]` and returns formatted JSON.
 * Preserves other top-level keys and other MCP server entries.
 */
export declare function mergeMcpServerEntry(existingJson: string | null, serverName: string, serverConfig: McpServerEntry): string;