Verified all three options from the task against Godot 4.6.2 directly
(godot --headless), rather than trusting the probe scripts' own printed
output from earlier sessions:
- ScriptServer doesn't exist as a class; no disable_os/disable_file_access/
disable_network project settings exist either. Nothing to configure.
- SubViewport isolates rendering/input only, not script capabilities — a
script inside one has identical OS/FileAccess/network access.
- Expression is not safe by default (can still reach unsafe methods through
a base instance); blocklisting dangerous substrings is trivially bypassed.
Recommendation: don't sandbox GDScript in-process (nothing to sandbox
with) — use a narrow non-Turing-complete content DSL for the common case,
and OS-level process isolation only if genuinely general scripting turns
out to be required.
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