we have a custom post type called "tools" and taxonomy for this post type called "tool-category".
We would like to rewrite category taxonomy to "tools" so both posts and archive pages has the same URL, e.g. web.com/tools/tool-name and web.com/tools/tool-category-name/
If we put "tools" to rewrite field in category settings, we get 404. The only solution was to use "tool" as the URL for posts and "tools" for categories, but this way we are unable to track whole post type with one URL: /tools/*