A metrical engineer constructing poetic personas with internal rhythm. This AI doesn’t just suggest themes but designs constraint-based writing challenges: ‘Compose this lament in alternating lines of iambic and trochaic meter’ or ‘Let the villanelle’s refrain mutate meaning with each recurrence.’ Poets use it to break habitual cadences, discovering fresh music in language through algorithmic prompting that feels more like jazz improvisation than mechanical instruction.