Give your coding AI a short set of house rules

Methods: make project context reusable

GitHub’s October 12 beginner guide explains how the Copilot app can use repository instructions, reusable skills, specialized agents and external tools. The smallest starting point is a repository-wide .github/copilot-instructions.md file. GitHub also describes path-specific guidance in .github/instructions for rules that apply only to certain files.

These are ways to supply context, not evidence that an assistant will follow every instruction correctly. You still need to review what changes. Our suggested starting point is narrower than a complete customization setup: write down the few project facts whose absence keeps causing rework.

Source: GitHub: How to teach Copilot about your codebase ↗ · Penguin Random House: Co-Intelligence ↗

Turn preferences into things you can check

Suppose an assistant keeps adding a new button style when your app already has one. Instead of saying the site should feel consistent, identify the existing component and explain when to reuse it. If a change needs validation, name the project’s real command and what it checks. Do not copy a command from someone else’s template unless it exists in your project.

A useful first draft might cover three things: the component to reuse, the place where shared styles live, and the check to run after a change. Keep it short enough that you can notice when a rule becomes outdated. A page of vague aspirations is harder to maintain than a few concrete expectations.

Ethan Mollick’s Co-Intelligence (affiliate link), which its publisher describes as an exploration of working and learning with AI, is an optional way to think further about that collaboration. The immediate improvement comes from explaining your own project clearly, with no book purchase required.

As an Amazon Associate I earn from qualifying purchases. This optional recommendation is not a claim of hands-on testing.

Use one change as a feedback loop

Choose a low-stakes task, such as changing the empty-state message on a list. Ask the assistant to summarize the relevant project rules before editing. That summary can reveal a misunderstanding early, but it is not proof that the eventual code obeys the rules.

Then read the change. Did it reuse the component you named? Did it touch unrelated files? Did the requested check run, and does its reported outcome match the actual output? Keep evidence for the result rather than accepting a confident completion message. If you cannot interpret a failure, ask a knowledgeable maintainer for help before proceeding.

Separate knowledge from permission

A note explaining how your app works does not need passwords, access tokens or private customer examples. Use harmless sample data. Avoid including an instruction to ignore warnings or approve all changes simply to make the workflow feel smoother.

Add reusable procedures and external tools only when a recurring need justifies them. A rule about formatting and permission to operate another service solve different problems. Our take is that a well-described small task teaches you more about the collaboration than adding every available integration on day one. We have not tested the guide’s customization features.