26 Sep 2026 · 8 min readPrompting

How to Use AI Prompts That Actually Work

The difference between a weak prompt and a strong one is almost never model choice — it's structure. A good prompt tells the model what it is, what it's given, what a great answer looks like, and what it must not do. This guide gives you that frame, shows why an example outperforms an instruction, and explains why iterating beats rewriting from scratch.

The four-part frame

Every good prompt answers four questions. If yours answers all four, you rarely need to change it.

frame

# 1. ROLE        - who should the model be?
# 2. INPUT       - what material does it get?
# 3. GOAL        - what does a great result look like?
# 4. CONSTRAINTS - tone, length, format, and what to avoid

filled in

You are a senior technical editor. Below is a rough draft of a blog post.

Goal: a 600-word post a smart non-expert would finish, with one concrete example per section.
Constraints: plain English, no jargon, no hype words, end with a single question.

💡 Pro Tip: You don't need all four every time. A summarisation task rarely needs a role. A writing task almost always does.

Show, don't just tell

Models imitate patterns far more reliably than they obey abstract instructions. One concrete example is usually worth a paragraph of description.

Weak: 'Write headlines that are punchy.' Strong: 'Write headlines under 60 characters, no clickbait, like these: "The 4-minute fix for a slow morning"'.
Weak: 'Be concise.' Strong: 'Answer in exactly three sentences, then stop.'
Weak: 'Use a friendly tone.' Strong: paste one paragraph that already sounds like you and say 'match this'.

This is why a saved, reusable prompt beats a freshly typed one every time. Store the version that worked — that's exactly what the SlashAI command vault is for.

Iterate, don't restart

The most common waste in AI use is throwing away a mediocre answer and typing the whole request again. You lose the good parts.

Keep it and cut: 'Keep paragraph 1 and 4, delete 2 and 3, tighten the ending.'
Keep it and expand: 'Expand section 3 with a real example and a number.'
Change the angle: 'Rewrite this for a 12-year-old, same length.'
Change the format: 'Turn this into a 6-slide outline with one bullet per slide.'

⚠️ Note: Restarting from scratch every time is why 'AI gives generic output' is such a common complaint. It usually gave a good output, and you asked for a new one.

Commands for each step

Use these to generate the prompt, refine the answer, and check it before you ship it.

/Explain

Explain Clearly

Explain any concept at the depth and reading level you ask for.