What
The sandbox is a restricted area Claude Code can run commands in. One of its checks used to start by looking at the disableNoSandbox setting and failing if it was not set. It now first tests a new condition and passes straight away if that condition holds. Only after that does it look at disableNoSandbox, the IS_SANDBOX environment variable and bubblewrap (a Linux tool used for sandboxing).
Why
This could change when Claude Code allows running without a sandbox.
Names in the bundledisableNoSandboxIS_SANDBOX
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
What the new condition tests, and what passing this check allows, are not clear.