---
title: "MGS3041: a job checkpoint this checkout cannot place"
description: Fires when a job record's checkpoint is neither this checkout's HEAD nor an ancestor of it, or its digest does not match the working state. The record is refused; fork it from a checkout at that checkpoint, or name this one's.
tags: [MGS3041, jobs, leases, fork, apply, agents, checkpoint, validation]
---

# MGS3041: a job checkpoint this checkout cannot place

`magus job fork`, `magus job apply` and `magus\job.put` refused a job record
whose checkpoint this checkout cannot start from:

```text
[MGS3041] checkpoint "abc123" is not HEAD or an ancestor of it in this checkout:
  fork the job where that revision is checked out, or name `magus vcs checkpoint -o name`
```

Nothing was written to the job store.

## What fires it

- A checkpoint revision this checkout's history does not hold below HEAD.
- A checkpoint digest that does not match the working state it names.

## What to do

Fork the job in a checkout at that checkpoint, or replace the checkpoint with
the one this checkout prints:

```sh
magus vcs checkpoint -o name
```

## See also

- [Leases](../../../guides/integrations/agents/leases.md): checkpoints and where a job starts.