Supply the material
Share the facts that must remain unchanged, the audience, tone and desired length. For editing, provide the original text and say whether structure can change. Ask the assistant not to add facts, commitments or quotations absent from the draft. A sample of your own writing can clarify the preferred voice.
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Edit for accuracy, not only tone
Compare the result with your source. Check names, numbers, dates and any obligations implied by the wording. If the draft becomes generic, point to the sentence that needs a more specific meaning. Use search only when external facts need checking; a fluent sentence is not evidence that its claim is true.