wykonawczymi
Wykonawczymi is the instrumental plural form of the Polish adjective wykonawczy. The stem wykonawczy comes from the noun wykonawca (contractor, executor) and the verb wykonać (to perform, to execute). In Polish, adjectives agree with the nouns they modify in gender, number and case, and the instrumental plural ending is typically -ymi (or -imi in some stems). Therefore, wykonawczymi is used when the modified noun is in the instrumental case and plural.
In usage, wykonawczy describes features, roles or documents related to execution or implementation. The exact sense
The form wykonawczymi is specifically the instrumental plural form. It occurs in phrases such as z umowami
See also: wykonawca, wykonanie, projekty wykonawcze, umowy wykonawcze.