Claude
Open Settings, then Account. Paste the paragraph into Instructions for Claude.
ChatGPT
Go to chatgpt.com/settings/personalization, or open Settings, then Personalization. Under Custom instructions, click ChatGPT.

Claude Code
Add the paragraph to your personal instructions file,~/.claude/CLAUDE.md. Create the file if it doesn’t exist. Claude Code reads it at the start of every session, in every project.
Or ask Claude Code to do it. Copy this prompt into Claude Code:
Antigravity IDE
1
Open Customization
In the Agent panel, click the ⋯ menu in the top right corner, then Customization.

2
Add a global rule
On the Rules tab, click + Global. Global rules apply in every workspace.

3
Paste and save
A file called 
GEMINI.md opens. Paste the paragraph, then save it with Cmd+S on a Mac or Ctrl+S on Windows.
~/.gemini/GEMINI.md. Gemini CLI reads the same file, so if you use it too, you’re already set.