Prompt Master: The Free Claude Skill That Writes Your Prompts For You

The short answer: Prompt Master is a free Claude skill that turns one rough line into a finished prompt for whichever AI tool you name, so you stop spending three or four messages fixing a vague request. Download it from GitHub as a ZIP, upload it in Claude under Customize → Skills, then ask Claude to write a prompt for a specific tool. It works on the Free plan too.

Most wasted AI messages follow the same loop. You type a quick, vague request, the answer misses, you add a detail, it misses again, and the fourth try finally lands. On Claude, every one of those retries counts against your usage limit. The Prompt Master skill cuts that loop by doing the thinking a good prompt needs before you send anything.

It is an open-source project by developer Nidhin, published on GitHub under the MIT licence, which means anyone can use it for free. At the time of writing it has close to 14,000 stars there, GitHub's version of a bookmark. Below is what it does, how to install it in a few minutes and how to get good results from it.

What the Prompt Master skill does

First, what a skill is. A skill is a saved set of instructions that Claude loads on its own when your request matches it. You install it once and it sits in the background until it is needed.

What this one is for. Prompt Master turns Claude into a prompt writer. You describe what you want in plain words and name the tool, and it hands back a prompt shaped for that tool. It covers chat assistants such as Claude, ChatGPT and Gemini, coding tools such as Cursor and Claude Code, image tools such as Midjourney and Stable Diffusion, video tools such as Sora and Runway, ElevenLabs for voice, and automation tools such as Zapier and Make. For a tool it has no profile for, it falls back on a short set of general questions.

What happens behind the scenes. It works out which tool the prompt is for, then pulls out what you actually want: the task, the format of the result, the limits, who it is for and how you will know it worked. It also checks your rough idea against 37 common ways prompts waste messages, such as a vague scope, no output format or no point at which the job counts as done. If something essential is missing, it asks you, but never more than three questions. It then picks a suitable prompt structure quietly, strips out every word that does not change the result and returns one block you can copy.

What you get back. A single ready-to-paste prompt, a line naming the target tool and one sentence on what it improved. Ask for something like “build me a landing page for my agency with a booking section” and the prompt spells out what the finished page must include, which files Claude may touch and when the job is done, so it does not keep going. If the prompt needs a setup step first, such as attaching a reference image, it adds a short note.

Be clear on what it saves. Prompt Master does not raise Claude's limits or make messages cheaper. It saves the retries: one well-built prompt instead of four rough ones. The longer and more specific the job, the bigger the saving.

How to install the Prompt Master skill in Claude

Step 1: turn on code execution. Go to Settings → Capabilities and switch on Code execution and file creation. Skills need it to run. Uploading your own skill works on the Free, Pro and Max plans.

Step 2: download the skill. Open the Prompt Master repository, click the green Code button and choose Download ZIP. A ZIP is a single compressed file that holds a folder.

Step 3: fix the folder name. GitHub names the folder inside the ZIP prompt-master-main, but Claude expects the folder to match the skill's own name, prompt-master, and a mismatch is a common reason uploads fail. Unzip the file, rename the folder to prompt-master and zip it again. On a Mac, right-click the folder and choose Compress. On Windows, right-click and choose Send to → Compressed (zipped) folder.

Step 4: upload it. In Claude's left sidebar, open Customize → Skills, click +, then Create skill → Upload a skill, and pick your new ZIP.

Step 5: switch it on and test it. Make sure the toggle next to prompt-master is on. Then open a new chat, because a chat that was already open may not pick up a freshly added skill, and send a test request such as the first example in the next section. If Claude's thinking mentions prompt-master, the skill has loaded.

Using Claude Code instead? Claude Code is Anthropic's coding tool that runs in your computer's terminal, the text window where you type commands. The project's own README suggests the browser route above, but you can also clone the skill straight into your skills folder with these two commands:

mkdir -p ~/.claude/skills

git clone https://github.com/nidhinjs/prompt-master.git ~/.claude/skills/prompt-master

How to use it once it is installed

Ask for a prompt, and name the tool. The skill only wakes up when you clearly ask it to write, fix or adapt a prompt for a specific AI tool. Ordinary chat, coding or writing requests leave it alone. Lines like these, taken from the project's README, trigger it:

Write me a prompt for Cursor to refactor my auth module

Generate a Midjourney prompt for a cyberpunk city at night

Here's a bad prompt I wrote for GPT-4o, fix it: [paste prompt]

Break this prompt down and adapt it for Stable Diffusion

Call it by name if you prefer. Type /prompt-master on the first line, then describe what you want underneath. This is handy when Claude does not pick the skill up on its own.

Fix a prompt you already have. Paste an old prompt and say which tool it is for. The skill treats whatever you paste as material to improve, not as orders to follow, then tightens it or rewrites it for a different tool.

Loosen it when needed. If a prompt comes back too strict for a quick job, tell it what to relax, for example “drop the file limits” or “make it shorter”, and it rewrites the prompt. Review every prompt before you run it, since you know the job better than any template.

See the difference. The README's own example starts from one line, Write me a midjourney prompt for a realistic samurai standing in the rain at night, and returns comma-separated descriptions of the subject, lighting and mood, Midjourney's settings for shape and style at the end, and a list of things to keep out, such as blur and watermarks. That is the format Midjourney reads best, and most people would never write it by hand.

Keep long projects consistent. When a chat already has history, the skill adds a short memory block to the top of the new prompt that lists the decisions you have made, such as your tools and naming rules, so the next tool does not undo earlier work. That memory lives inside the chat. In a fresh chat, restate the key decisions in your first message.

Common mistakes when using the Prompt Master skill in 2026

Expecting it to fire on every message. It stays quiet in normal conversation by design. If you just chat, you get ordinary Claude. Say “write a prompt for” and name the tool.

Skipping its questions. The up-to-three questions it asks are the details it could not guess. Answer them in a line each, or the prompt fills the gaps with assumptions.

Pasting the prompt into a different tool. Each prompt is built for the tool you named. A Midjourney prompt full of settings will confuse ChatGPT, and a Cursor prompt will not suit Gemini. Ask again for the new tool.

Running agent prompts without reading them. For tools that can edit files or run commands, such as Claude Code or Cursor, the skill adds a warning to check the file paths, the forbidden actions and the points where the tool must stop and ask. Read those lines before you paste.

Never updating it. An uploaded skill stays at the version you installed. The project updates often, with version 1.8.0 adding the current Claude and GPT models, so check the repository every couple of months and upload the newer version.

FAQ

Is the Prompt Master skill free?

Yes. It is open source under the MIT licence, and Claude's Free plan can run uploaded skills, so you do not need a paid plan to use it.

Does Prompt Master stop me hitting Claude's usage limits?

Not directly. Your limit stays the same. What changes is how many messages a task takes, because one well-built prompt replaces the three or four retries a vague one usually needs.

Can I use Prompt Master in ChatGPT or Gemini?

The skill itself runs inside Claude. The prompts it writes, though, are meant for other tools, so you can generate a prompt in Claude and paste it into ChatGPT, Gemini, Midjourney or any other tool you named.

Why does my Prompt Master upload fail?

The usual cause is the folder name. The ZIP from GitHub holds a folder called prompt-master-main; rename it to prompt-master, zip it again and upload that. Also check that code execution is switched on in your settings.

Want the skill link and this setup guide in one place? Comment PROMPT on the reel and we will send it over.

In short: Prompt Master is a free, open-source Claude skill that writes the prompt for you, shaped for whichever tool you name, from ChatGPT and Cursor to Midjourney and ElevenLabs. Download it from GitHub, rename the folder to prompt-master, re-zip it and upload it under Customize → Skills with code execution on. Then ask for a prompt and name the tool, answer its few questions and paste the result. Your limit does not grow, but you stop burning messages on retries.