---
id: TASK-014
title: External change detection on save
status: "\U0001F7E6 Backlog"
assignee: []
created_date: '2026-06-29 16:26'
labels:
  - feature
  - release-2
dependencies: []
priority: medium
ordinal: 14000
---

## Description

<!-- SECTION:DESCRIPTION:BEGIN -->
Release 2. If an open file changes on disk while editing (synced vault: Obsidian/iCloud), glint silently overwrites on save. Track the file's mtime/size at load; before saving, if it changed, warn and offer to overwrite/reload/diff instead of clobbering.
<!-- SECTION:DESCRIPTION:END -->

## Acceptance Criteria
<!-- AC:BEGIN -->
- [ ] #1 Detect when the open file changed on disk since load
- [ ] #2 On save with an external change, warn instead of silently overwriting
<!-- AC:END -->