voice-write

Writes the message the user would have written: right length, right opener and sign-off, their vocabulary, their register — then checks it with voice-check. Without a profile a model writes its own idiolect: generic LLM email runs ~2.7× longer and far more formal than human email (Li et al., WebSci '25), and "write like a human" prompting does not remove model tells (arXiv:2604.14111). With a profile but no discipline it performs a caricature: one observed "Quick one:" becomes every opener.

Design rule: the profile constrains, the samples carry the voice. The draft prompt gets the register's constraints and 3–5 of the user's own messages; the numbers and the signature-move list stay in the checker.

When to use

• "write this in my voice", "make it sound like me", "reply to this as I would", "draft the decline in my style", "answer this Slack thread as me"

When NOT to use