Length and Tone on Purpose
Length Controls That Actually Work
Exact word counts are followed loosely — treat a number as a strong steer rather than a guarantee. Structural limits work far better, because they constrain the shape rather than asking for arithmetic. "Three bullets, one line each" is more reliable than "about 40 words". "One paragraph" beats "roughly 100 words". "One sentence per item" beats "keep it brief". And the strongest length control of all is a stated container: "this has to fit in a text message", "this is the preview line in an email", "this goes on one slide with a picture". The container tells the model what the real constraint is, and it will size the content to fit it.
- Weak: "Keep it brief." Strong: "Three bullets, maximum one line each."
- Structural limits are followed more reliably than word counts
- Name the container — a text message, a slide, an email preview line
- For long outputs, specify sections rather than a total length
Tone by Comparison, Not by Adjective
Adjectives are slippery. "Professional" means one thing in a law firm and something else in a startup; "friendly" produces exclamation marks you did not want. Two things work better. The first is comparison: "write it the way a good colleague explains something in a corridor", "the tone of a well-written newspaper explainer", "how you would text a friend who asked for a favour". The second is an example of your own writing, which is the most precise instrument available. If you must use adjectives, pair each one with a negative boundary — "warm but not chatty", "confident but not salesy" — because the pair defines a narrower band than either word alone.
- Weak: "Make it professional." Strong: "Write it the way a well-edited news explainer would."
- A pasted sample of your own writing beats any description of tone
- Pair adjectives with boundaries: "direct but not blunt", "warm but not chatty"
- Name the specific habits you dislike — exclamation marks, rhetorical questions, "delve"
Cut the Padding Explicitly
Default output has recognisable furniture: a restatement of your question, a preamble about how great the topic is, a closing paragraph summarising what it just said, and an offer to help further. None of it is wrong; all of it is padding when you are going to paste the result somewhere. You can remove it in one line. "Start with the answer. No preamble, no summary at the end, no offer to help." For repeated work, put that line into your standing instructions once and stop thinking about it. This single sentence probably saves more editing time than any other prompt habit in this course, precisely because the padding is so consistent.
- "Start with the answer, no preamble" removes the most common wasted paragraph
- Ban the closing summary explicitly if you do not want it
- Name any specific verbal tics you keep having to delete
- Put this line in your saved instructions rather than retyping it daily
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