VS Code itself is not open-source, but its core, Code – OSS, is. It’s available on GitHub and anyone can access, modify, and distribute it.

Microsoft has released the source code for the GitHub Copilot Chat extension for VS Code under the MIT license.

VS Code team open‑sourced GitHub Copilot Chat (MIT licence) and invites developers to explore, contribute and shape the AI ...

As implied, the move comes amid long-running concerns over telemetry and data privacy in Microsoft's development tooling. While VS Code itself is built on the open source Code - OSS base, the official ...