اُفْتُتِحَتِ الْمَكْتَبَةُ الْيَوْمَ.
The library was opened today.
The verb is passive, and “al-maktabah” functions as the grammatical subject of that passive construction. The statement foregrounds the opening, not the identity of the opener. If the agent is disputed, the passive expression does not by itself settle the dispute.
الْيَوْمَ افْتَتَحَ الْمَدِيرُ الْمَكْتَبَةَ.
Today the director opened the library.
In this alternative the agent is expressed. The two sentences can both be appropriate, but they distribute informational attention differently and should not be treated as exact stylistic equivalents.