plain-prose.txt
Please remove all mannered prose. Mannered prose substitutes metaphor
and flourish for direct statement — "a dial worth turning" instead of
"a parameter worth varying." It exists to display the writer, not to
convey the idea. Say what you mean. When a literal phrase is available,
use it.

Put this in your first message of a session rather than the system prompt. Style instructions placed there hold better on Fable 5.1.