This is the 13519th most frequent German word.
brauchbare
Usable or practical.
In this sentence, 'brauchbare' is used as an adjective to describe 'Idee' (idea), indicating that the idea is practical or usable.
Das ist eine brauchbare Idee.
That is a useful idea.
Here, 'brauchbaren' modifies 'Werkzeugen' (tools) and is in the plural, considering the context of seeking functional items for a purpose.
Wir suchen nach brauchbaren Werkzeugen für das Projekt.
We are looking for useful tools for the project.
In this context, 'brauchbare' describes 'Alternativen' (alternatives), asking if there are viable options other than the given method.