Unclear It is not clear where the fallback folder value comes from or whether a reader can set it.
What
The sandbox is the restricted area Claude Code can run commands in. It now accepts a NuGet fallback folder setting and, when one is given, passes it to commands as an environment variable, a named value a program reads at startup, alongside the git settings it already passes. NuGet is the package manager for .NET.
Why
In practice this helps .NET package restores work inside the sandbox.
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It is not clear where the fallback folder value comes from or whether a reader can set it.