Choose observable behavior rules, resolve visible warnings, and copy the format that fits your AI product. No account, storage, or external AI call is involved.
Browser-only builder
Build your IntentPack
Your choices stay in this tab and disappear when it is refreshed. Nothing is uploaded or saved.
Step 1: Start
About this browser tool
What happens before you copy
Your choices are checked locally, then turned into three copy-ready formats without contacting an AI model.
Local process
How the builder works
ValidateRequired role and purpose fields are checked.
CheckConflicting rules and unavailable capabilities are shown as warnings.
CreateThe same choices produce Chat First Message, Custom Instructions, and Project / System text.
Private and temporary
Before you leave this page
Copy every result you want to keep.
Refreshing, closing, or leaving clears your choices.
Nothing is uploaded or saved by this builder.
Remove sensitive information before using another AI.
Simple answers
Common questions
Open a question for a short, practical answer.
Does the builder contact an AI model?
No. Local TypeScript rules and templates create the results inside your browser. Your choices and generated instructions are not sent to an external AI API.
Will the instructions work identically in every AI?
No. Models, plans, tools, and browsing capabilities differ. Test a normal example first and revise any rule the selected product cannot follow.
Where should I paste each format?
Chat First Message: send it at the start of one new conversation.
Custom Instructions: use it in a short persistent preference or style field, such as ChatGPT Custom Instructions.
Project / System: use it for ChatGPT Projects or custom GPTs, Gemini Gems, Claude Projects, or a developer instruction field that explicitly supports it.