Install

Scripter is one skill: a SKILL.md file and four checklists. The same files work everywhere below. Only the way you add them differs.

scripter.zip

Custom GPT instructions

Claude Code

For the Claude Code CLI and the Code tab of the Claude desktop app.

1. Add the marketplace:

   /plugin marketplace add MichaelCodeToLimit/scripter

2. Install the plugin:

   /plugin install scripter@scripter

3. Start a new session. The skill loads by itself for design work. To call it by name, type /scripter:scripter.

From a terminal, the same two steps are:

claude plugin marketplace add MichaelCodeToLimit/scripter
claude plugin install scripter@scripter

As a personal skill instead

Unzip scripter.zip into your skills folder, so that you end up with:

• macOS and Linux: ~/.claude/skills/scripter/SKILL.md
• Windows: %USERPROFILE%\.claude\skills\scripter\SKILL.md

Call it by name with /scripter.

Caution

Use the plugin or the personal skill, not both, or the skill loads twice.

claude.ai

For the Claude website and apps.

1. Go to Settings → Capabilities and turn on Code execution and file creation. Skills need it.

2. Download scripter.zip.

3. Go to Customize → Skills (claude.ai/customize/skills), choose to upload a skill, and pick scripter.zip.

4. Check that the skill’s toggle is on.

ChatGPT

Which way works depends on your plan.

Skill upload

For Business, Enterprise, Edu and Healthcare plans.

1. Download scripter.zip.

2. In ChatGPT, go to Plugins → Skills → Create → Upload from your computer and pick the zip.

3. It turns on by itself for design work. To call it directly, type @scripter in a message.

If you don’t see Skills, your plan or workspace doesn’t allow custom skills. Use a Custom GPT instead.

Custom GPT

For any paid plan.

1. Download scripter.zip and unzip it. You need the four files in scripter/references/.

2. Download the Custom GPT instructions.

3. Go to Explore GPTs → Create (or My GPTs → Create a GPT) and open the Configure tab.

4. Fill in:

   • Name: Scripter
   • Description: Checks how a thing works and whether your design is possible, buildable and the best approach, before building it. No praise.
   • Instructions: paste everything from the instructions file.

5. Add these conversation starters:

   • Here's my idea for a new product. Will it work?
   • Turn this sketch into a 3D model.
   • Is this app idea possible to build?
   • Review my design and tell me what's wrong with it.

6. Under Knowledge, upload the four files: physical-products.md, sketch-to-3d.md, software-systems.md and spaces-structures.md.

7. Under Capabilities, turn on Code Interpreter & Data Analysis. It uses it for calculations. Web search is optional.

8. Click Create. Set sharing to Only me, or share the link.

To use it, pick Scripter from the sidebar and start a chat there. Your other ChatGPT chats aren’t affected.

Note

Menu names change from time to time. If a step doesn’t match what you see, check Claude’s help article How to create custom skills or OpenAI’s Skills in ChatGPT.

Check that it works

Start a new chat and send:

A drone with a solar panel on top so it charges while flying and never has to land.

The answer should open with Verdict: ❌ and a power budget: roughly 20 W available against 150–200 W needed. If you get a cheerful drone design instead, the skill didn’t load. Check the toggle, or call it by name.