Prompts vs skills: which one do you need?
A prompt is a request you send once. A skill is a standing set of instructions your assistant reuses. Here is when to use each.
, 2 min read
Promptlexity has two libraries: prompts and skills. They overlap, and people often ask which they should use. The short answer is that a prompt is for a moment and a skill is for a habit.
A prompt is a single request
A prompt is the message you send. It can be one line or a page long, but you send it, you get an answer, and it is done. If you want the same thing tomorrow, you paste it again.
Prompts are the right tool when:
- The job is a one-off, or you do it now and then.
- You want to tweak the request each time.
- You are trying something out and are not sure yet what works.
A skill is a standing instruction
A skill is a set of instructions you add to your assistant once. It sits in the background until a request matches what it is for, then the assistant follows it. In Claude, skills load on their own. In ChatGPT and Gemini, you can get the same effect with a custom GPT or a Gem.
Skills are the right tool when:
- You do the job every week, or every day.
- You want the same standard every time, without remembering to ask for it.
- The instructions are long, or come with reference material like a style guide or a checklist.
The same job, both ways
Take editing a document into plain English. As a prompt, you paste "Rewrite this in plain English for a general reader, keep it under 200 words" above each document. As a skill, you add the plain English editor once. From then on you just say "tidy this up" and the assistant applies the full set of rules, including a word-swap list you would never paste by hand.
The skill does more, and asks less of you each time. The prompt is quicker to start and easier to change.
The natural path
Most good skills start life as prompts. You write a prompt, fix it a few times, and notice you are pasting it every day. That is the moment to turn it into a skill. Our guide on building a prompt library covers the steps, and how to add a skill to Claude covers the setup.
A simple rule
If you have pasted the same prompt three times this month, make it a skill. If you have not, keep it as a prompt.