# Write custom instructions for my AI assistant

Custom instructions, a project brief, or a custom GPT/Claude Project setup so the AI works the way you do.

- Topic: Working with AI
- Framework: RTF
- Level: Standard
- Tags: AI & Prompting, Write, Fill-in Template
- Source: https://www.thinkwithprompt.com/prompts/write-custom-instructions-for-my-ai-assistant

## Prompt

```text
Help me write custom instructions for my AI assistant (ChatGPT custom instructions, a Claude Project, or a custom GPT).

**Who I am and what I do:** [ROLE, industry, expertise level]
**What I mostly use AI for:** [TASKS]
**How I want answers:** [length, format, tone, level of detail, language]
**Things that annoy me in AI answers:** [e.g. filler, excessive caveats, bullet lists for everything, flattery]
**Reference knowledge it should use (for Projects/GPTs):** [documents, style guides, product info]

Deliver:
1. **About me** section (under 1,000 characters).
2. **How to respond** section (under 1,000 characters) with specific, testable rules.
3. For a Project or custom GPT: a full instruction set — purpose, scope, behavior rules, how to use the reference files, and what to do when unsure.
4. 3 test prompts to check that the instructions work.
```

## What to fill in

- ROLE, industry, expertise level
- TASKS
- length, format, tone, level of detail, language
- documents, style guides, product info

Free to copy and use. From ThinkWithPrompt (https://www.thinkwithprompt.com/), a library of 2,663 curated AI prompts.