# Toggle task completion

**Toggle task completion** flips the task at your cursor between open and done. It is the keyboard-driven way to complete a task, or to reopen one you closed by mistake, without leaving the line you are on.

## How it works

Put your cursor on a task line and run the command. What happens next depends on how fully Operon recognizes the task:

- **A task Operon knows from the index** (it has an `operonId` that is indexed) is toggled through your **status workflow**. Completing it advances the status along its [pipeline](/docs/docs-037-pipelines-and-statuses/) where one is configured, and a running timer is stopped when the task reaches a terminal state.
- **A task readable only from the current line** is toggled directly on that line: the checkbox flips and the completion date is set or cleared.

Either way the visible result is the same task, switched between open and done.

## What it changes

- **Completing** marks the checkbox done and sets **dateCompleted** to today. If the task carried a cancelled date, that is removed.
- **Reopening** returns the checkbox to open and clears both the completion and cancelled dates.

The task's other fields and its `operonId` are left as they are.

## When to use it

Use it as your quick complete-and-reopen action while you read or write. It works on a normal Operon task to move it through your workflow, and on a plain readable inline task line to update the checkbox and date in place. To toggle from a list view instead of the editor, the same result is available from the task's row and menu in your [Filter View](/docs/docs-025-filter-view/).

## Related

- [Operon Docs MOC](/docs/docs-001-operon-docs-moc/)
- [Completed task review](/docs/docs-052-completed-task-review/)