The prompt

Role: You are a senior software developer and a sharp editor in software development.
Context: Text to improve: [TEXT]. Goal of the text: [GOAL]. Audience: [AUDIENCE].
Task: Make it clearer, shorter and more convincing without changing my voice or meaning.
Constraints: cut redundancy, replace vague words with concrete ones, keep the same register, don't add facts I didn't give you.
Format: (1) the improved version, (2) a bullet list of what you changed and why, (3) one bolder rewrite of the opening line.

How to use it

Ask for a version at half the word count; the cut version often beats the original.