The standard experiment is asking AI to write a motion, reading the result, and concluding it writes like a competent stranger with no stake in the outcome. That conclusion is correct. Generation from a blank prompt produces the average of everything ever written on a topic, and average legal writing is exactly what it sounds like.
The productive inversion is doing the thinking yourself and using AI as an editor. Most lawyers have never had a demanding editor. Law school does not provide one and practice rarely does, which is why so much legal writing is structurally sound and unreadable.
Why editing works better than generating
Your argument is the valuable part, and it is the part the model cannot supply. It does not know which facts you have, which judge you are in front of, or which concession you cannot make. Asked to generate, it fills those gaps with plausible generalities.
Editing keeps your reasoning and applies the mechanical skills where the model is genuinely good: structure, concision, transitions, and consistency. Those are the skills lawyers are weakest at and least likely to receive feedback on.
There is also an attention effect that matters. You cannot see your own draft after the third read. You know what you meant, so you read what you meant rather than what is on the page. A fresh reader catches the sentence that only makes sense if you already understand the argument. AI is available at 11pm and does not get tired of your brief.
The requests that work
Ask for one job at a time. A general request to improve the draft produces mild praise and cosmetic edits.
Find the weakest argument in this brief and explain why it is weak. This is the most valuable single request. The answer is usually the section you were least confident about, which is useful confirmation, and occasionally it is a section you thought was fine.
Write the strongest response opposing counsel could make to this argument. Then you address it before they file it. This one changes outcomes.
Cut this by 20 percent without losing substance. Judges and clerks read a lot. Nearly every brief survives this cut and improves.
Flag every sentence over 30 words and every paragraph over 150 words. Purely mechanical, and it fixes the density problem that makes legal writing hard to read.
Explain this section back to me as if you were the judge. If the explanation is wrong, the section is unclear. This is a comprehension test, not an editing request, and it is the fastest way to find the paragraph that is doing less work than you thought.
Identify undefined terms and unexplained assumptions. You have been living in this matter for months. The reader has not.
What to instruct up front
Tell it not to rewrite your sentences wholesale unless a sentence is broken. Without that instruction, models tend to replace your prose with their prose, which is smoother and less yours. You want the edit, not the replacement.
Tell it your reader. A brief for a busy motions judge, a letter to a sophisticated opposing counsel, and a client explanation are three different registers.
Ban the vocabulary you dislike explicitly. Most legal writing improves the moment “pursuant to,” “herein,” and “it should be noted that” are gone.
The prompt patterns in AI prompts for lawyers transfer directly here.
The citation rule
AI does not verify citations, and this is where careers have been damaged.
Never ask it to add authority. If it suggests a case, treat that as a lead to check in a real research database, not as a citation. If it summarizes a case you provided, verify the characterization against the opinion, because a subtly overstated holding is harder to catch than an invented case and just as damaging.
Editing your citations for format is fine. Sourcing them is not.
Where generation is genuinely fine
Some writing is not argument and does not need your voice.
Procedural background sections drawn from documents you provide. Statements of undisputed facts, from your own record. Routine correspondence. First drafts of standard discovery objections from your own objections library.
The test is whether the document requires judgment or just assembly. Assembly is a fine job to hand over.
Do this today
Take a brief you already filed. Ask what the strongest opposing argument to its central point is.
If the answer names something you addressed, that is a good sign about the brief. If it names something you did not, you just learned something about how you argue, and it applies to every brief you write from now on.