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**Help article: Plan a change before you build it**

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Documentation

# Plan a change before you build it

Let the agent analyze the problem and write a plan. Read the plan, correct it, then start the work.

Updated October 13, 2026

1

## Know when to plan

Use Plan mode when a change touches many files, when you are not sure how to do it, or when a mistake is expensive. For a small and clear change, Regular mode is faster.

In Plan mode the agent reads the repository and saves a plan. It does not change your code and it does not open a pull request.

2

## Start a plan session

Open **New session**, choose the project and select **Plan** next to **Regular**. Describe the result that you want and the limits. Then start the session.

**Plan a change** on the Plans page opens the same form with Plan already selected.

3

## Read the plan

When the agent saves the plan, the session shows **Plan ready** with the revision number. Select **Review plan** to open it. A plan has three parts:

- **Goal:** the result, in a few sentences.

- **Acceptance criteria:** how to know that the work is correct.

- **Implementation steps:** the work, in order.

4

## Correct the plan

You have two ways to change a plan:

- In the session, write what must change in the **Refine the plan** field and select **Refine plan**. The agent saves a new revision.

- On the plan page, select **Edit plan** and change the title, the description, the criteria or the steps yourself. **Revision history** keeps the earlier versions.

5

## Implement the plan

Select **Implement plan**. A plan that is a draft must be marked ready first, with **Mark as ready**.

Before you start, choose how to run the work:

- **One agent** makes one session that does all the steps that remain.

- **Parallel agents** makes more than one session.

The sessions start when your plan has capacity. Each session is a normal session: it has a conversation, changes, a preview and a pull request.

After the work starts, the steps of the plan are locked. You can continue to edit the title, the description and the acceptance criteria.

6

## Follow the result

The plan page lists its sessions under **Implementation history**. The Plans page shows the status of each plan, from draft to released, and has a search field and a filter for the project.

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## On this page

[Know when to plan](#step-1)[Start a plan session](#step-2)[Read the plan](#step-3)[Correct the plan](#step-4)[Implement the plan](#step-5)[Follow the result](#step-6)

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