How to Update Claude Project Instructions with a Refinements Workflow

Why Use a Refinements Workflow for Claude Project Instructions?

The Project instructions you created in the previous lesson are the baseline context for the reporting environment. They describe the project, the data, the reporting logic, and the rules Claude should follow.

But real-world reporting environments evolve. New edge cases appear, definitions change, and you discover additional guardrails as you work with the data. Manually rewriting and repasting the full Project instructions every time quickly becomes cumbersome.

Keep the Baseline Project Instructions Stable

The goal is to build a strong baseline once and avoid constantly modifying it. Your original Project instructions contain the broader context that should remain relatively stable: role, taxonomy, metric definitions, business logic, guardrails, and reporting preferences.

Instead of rewriting that entire prompt whenever something changes, the refinements workflow gives you a separate layer for incremental updates.

How the Refinements File Works

The workflow uses a separate refinements.md file that lives inside the Claude Project. When you first create it, the file can be essentially empty, with sections ready to capture future changes.

Your Project instructions tell Claude to check the refinements file first. If a rule or definition in the refinements file conflicts with the original Project instructions, the refinement takes priority.

Capture Changes While You Work

The most useful part of this workflow is that refinements can come directly from the work you're already doing.

If you notice a reporting rule that should be permanent, you can correct it in the current chat, confirm that the new behavior is right, and then capture that change so future chats follow the same rule automatically.

Example: Change the Reporting Week from Monday to Sunday

In the lesson, the existing reporting workflow starts each week on Monday. I change the report so the week instead runs from Sunday through Saturday.

First, I make the change directly in the chat and confirm that the report now behaves correctly. Once I know that this should be the permanent rule for the client, I capture it as a refinement.

The updated refinements file now contains the new week-start rule, so Claude can apply it automatically in future reporting.

Use the Refinements Capture Skill

The Refinements Capture Skill is what turns a change from the current conversation into a structured update for the Project.

Once you've identified a change you want to keep, run the Skill and tell it to capture the latest adjustment. It generates an updated refinements file containing the