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A new boolean setting that causes Claude Code to exit with an error at startup if sandbox.enabled is true but the sandbox cannot start (missing dependencies, unsupported platform, or platform not in enabledPlatforms). When false (the default), a warning is logged but execution continues.
Evidence
Strict sandbox setting (search for "failIfUnavailable", "sandbox required but unavailable")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.