Custom AI Assistants and Projects Explained

If you find yourself pasting the same context into an AI assistant every day, a custom assistant or project will save you time. Most major AI tools now offer some version of this feature, under different names.

What they are

A custom assistant (sometimes called a custom GPT, a project, a gem or a space) bundles:

• Instructions: how the assistant should behave, its tone and rules
• Knowledge: files it can refer to, such as style guides or product documents
• Tools: in some products, abilities like web search or code execution

Good use cases

• Brand writer: knows your tone, audience and banned phrases; see our marketing prompt templates.
• Support helper: drafts replies from your help documentation.
• Onboarding guide: answers new starters’ questions from internal documents.
• Research assistant: follows your preferred structure and sources.
• Tutor: explains topics at a set level, with quizzes.

How to set one up

1. Define the job in one sentence: “Drafts customer support replies for [product].”
2. Write specific instructions: audience, tone, format, what to do when unsure.
3. Add knowledge files: current, accurate documents only.
4. Test with real tasks and refine the instructions.
5. Decide who can access it before sharing.

Writing good instructions

• Be explicit about format: “Reply in under 120 words, with one clear next step.”
• Tell it what to do when information is missing: “Ask one clarifying question.”
• Include examples of good outputs.
• Our prompt engineering guide covers the principles.

Privacy and security

• Check whether uploaded files and conversations are used for training.
• Don’t upload confidential documents to assistants shared publicly.
• Be aware that some shared assistants can reveal their instructions or files if asked cleverly.
• Use business plans with admin controls for company data; our AI for small business guide has more on getting started.

How it relates to RAG

Assistants that answer from uploaded files often use retrieval behind the scenes; see RAG explained.

Frequently asked questions

Do I need coding skills to build a custom assistant?

No. Most tools let you set one up with instructions and file uploads.

Can custom assistants access the internet?

Some can, if the feature is enabled. Check the tool’s settings.

Are custom assistants private?

It depends on your settings and plan. Review sharing and data options before adding sensitive files.