Two or three real moments you can describe properly, plus what he is like when nobody is performing, what changed when he met his partner, how you know him, the tone you want and how long it should run. The what-he's-like question is the one worth taking your time over — it is where the best material comes from.

It writes jokes from what you tell it is true and specific about him, not from a bank of best-man material — so a thin brief gets a thin speech and a properly told story gets a real laugh. It will not write anything whose punchline is humiliation rather than recognition, because that line is where a joke stops being funny and starts being cruel.

It cannot invent a memory, a nickname or a person it was not given — where a detail is missing, it writes [ADD FACT: what is needed] instead of guessing. If something still reads wrong once you have the speech, say what to change and it writes it again.

Yes — say what to change and it runs again. A change is another run from your balance, charged only for what it uses.

Top up once to start. Jobs cost pence from your balance, and you are charged only what they actually use. A job that fails to generate spends nothing at all.