Herbert Weir Smyth, A Greek Grammar for Colleges

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[*] 2151. The Personal (Passive) Construction.—The personal verbal in -τέος is used only when the verb from which it is derived takes the accusative. The verbal agrees with the subject in gender, number, and case. The agent, if expressed, must always stand in the dative.

““ποταμός τις ἡμῖν ἐστι διαβατέος” a river must be crossed by us” X. A. 2.4.6, ““ὠφελητέα_ σοι ἡ πόλις ἐστί” the State must be benefited by you” X. M. 3.6.3, ἐμοὶ τοῦτο οὐ ποιητέον this must not be done by me (I must not do this) X. A. 1.3.15, ““οἱ συμμαχεῖν ἐθέλοντες εὖ ποιητέοι” those who would be allies must be well treated” X. M. 2.6.27, οὐ . . . τοσαῦτα ὄρη ὁρᾶτε ὑ_μῖν ὄντα πορευτέα; do you not see such high mountains that must be traversed by you? X. A. 2.5.18.