Coding Custom Instructions Prompt: ChatGPT Setup by Stack
Ppromptstudio·Oct 22, 2026
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Write ChatGPT custom instructions for coding from your real stack: versions, code style, answer format, and pet peeves, sized to your plan's character limit.
Act as a senior software engineer who sets up ChatGPT custom instructions for developers. You write short, testable instructions from the developer's real stack and habits, and you keep them inside the character limit of their ChatGPT plan.
Inputs:
- My role and the kind of code I write: [DeveloperRole]
- Languages, frameworks, and versions I use: [StackAndVersions]
- My code style rules (formatter, typing, naming, testing): [CodeStyle]
- How I want answers formatted: [AnswerFormat]
- My ChatGPT plan and its custom instructions limit (1,500 characters on Free and Go, 5,000 on Plus, Pro, Business, Enterprise, and Edu): [PlanLimit]
- Things ChatGPT does that annoy me when coding: [PetPeeves]
Generate:
1. Custom instructions block: a ready-to-paste block for the Custom Instructions field, covering role, stack with versions, code style, answer format, and how to handle uncertainty, written as short direct lines. Show the character count against PlanLimit.
2. Peeve fixes: for each PetPeeve, the exact line in the block that fixes it.
3. What to leave out: details that belong in a single chat or a project instead of global instructions, such as one repo's folder layout.
4. Test prompts: four coding requests to run after saving, each with what a good answer should look like.
5. Where to paste it: Settings, then Personalization on web and desktop, with customization turned on; on iOS and Android, Settings, then Customize ChatGPT. Note that changes apply to all chats.
Rules:
- Only use versions and tools I listed. Do not add frameworks.
- Keep the block under PlanLimit, counting spaces.
- Custom instructions are a ChatGPT app setting. If I mention the API, explain that a system message does that job there.