> ## Documentation Index
> Fetch the complete documentation index at: https://summer-18f03259-codex-native-multiplayer-entry.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Is Summer Engine compatible with my existing project?

> Summer uses familiar upstream-compatible formats, while minimum and recommended project compatibility ranges remain unmeasured.

## Start with the measured compatibility contract

Summer Engine uses familiar text scene, resource, script, and project formats. The current
upstream technical base is 4.7.2, no next upstream version is currently claimed, and Summer
follows upstream continuously. The minimum and recommended project compatibility ranges are not yet measured,
so this page does not promise that every historical project opens unchanged.

## What to evaluate

**Portable source formats.** `.tscn` scenes, `.gd` scripts, `.tres` resources, and
`project.godot` configuration use familiar upstream-derived formats. This is a format fact,
not proof that every file produced by every upstream release loads unchanged. Commit before
the first open, then review import and configuration changes normally.

**Third-party libraries and plugins.** Pure GDScript addons are the safest case. Native
extensions, custom editor integrations, and addons pinned to a different upstream version
need explicit compatibility testing.

**Export targets.** Verify the installed templates and run an exported-build smoke test for
each target. Do not infer web, desktop, mobile, or native-extension compatibility from the
upstream base alone.

**Team workflows.** Mixed-editor teams can share the repository when they pin compatible
versions and review generated changes. Shared formats reduce friction; they do not guarantee
zero differences between editors or importers.

## What Happens When You Open Your Project

1. **File → Open Project** (or Project Manager) → browse to your project folder → select `project.godot`
2. Summer Engine automatically indexes your project (30 seconds to 2 minutes depending on size)
3. The AI learns your scenes, scripts, assets, and relationships
4. You start chatting. Describe what you want to change; Summer Engine applies it

## Zero Lock-in

Your Summer game remains yours: GDScript, text scenes, resources, and assets stay in
documented formats. Opening them in another compatible editor may require an import pass and
does not carry Summer-only AI or platform surfaces.

## Version Compatibility

Use the generated [Compatibility & upstream](/reference/compatibility) page for the current
base and measured claims. Projects from Godot Engine 3.x need the upstream 3→4 migration
before they can be evaluated against Summer Engine's current base.

## Related

<CardGroup cols={1}>
  <Card title="Quickstart: Existing Project" icon="folder" href="/quickstarts/existing-godot">
    Open your project in Summer Engine in 5 minutes
  </Card>
</CardGroup>