list_directory_filters
List directory filter options
Returns the valid filter values currently available in the Vitena provider directory: specialization codes (with human labels), spoken-language codes, and the countries that currently have listed professionals. Call this FIRST when you intend to filter a search by specialization — that argument only matches exact codes from this list, so guessing a specialty name will silently return no results. Note that CITY is NOT in this list and does not need to be: search_providers resolves a free-text city, district or region name against a gazetteer, so pass the name the user actually said.
无需输入参数。