# Cline 4.1.0: one VSIX ships both the legacy and SDK-based extension behind a staged rollout

> The stable VS Code extension becomes a combined A/B package: a single VSIX containing the current extension and the new SDK-based extension, with a loader that activates exactly one per window under a remotely controlled staged rollout starting at 1% of users. Settings and credentials are shared between the two, but tasks created on the new extension are not visible while running the old one.

| | |
|---|---|
| **Tool** | Cline |
| **Version** | v4.1.0 |
| **Kind** | release |
| **Published** | 2026-07-31 |
| **Observed** | 2026-08-11 |
| **Significance** | 4/5 |
| **Breaking** | no |
| **Categories** | feature, capability |

## What changed


- One VSIX contains both bundles plus a loader that activates exactly one per window
- Rollout is staged and remotely controlled; assignments apply on window reload, never mid-session; starts at 1%
- If the new extension fails to activate, the loader falls back to the current extension in the same window
- Settings, credentials, and preferences are shared; nothing is migrated or lost when switching
- Tasks created on the new extension aren't visible while on the old one (they return if re-promoted)
- Legacy bundle: `legacy-extension` @ 3fdc186f1 (4.0.12 + free-model button wording); next bundle: `main` @ 0746ea72bf6
- Rollout machinery lives in apps/vscode-rollout


## Sources

- [github_release](https://github.com/cline/cline/releases/tag/v4.1.0) — retrieved 2026-08-11

## Community

_No curated reactions recorded. Facts and community takes are kept in separate layers
and never blended._

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Canonical: https://changelogs.info/cline/v4-1-0
Entity: https://changelogs.info/cline
Event ID: `evt_2026-07-31_cline_v4-1-0`
Licence: event synthesis © changelogs.info, CC BY 4.0. Linked sources belong to their vendors.