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Confirm the managed installation

Run:
An official standalone install has a schema-v2 receipt whose executable, version, target, sysroot, and channel match the running binary. If the receipt is missing or malformed, reinstall from the stable entrypoint:

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Preview an update

Resolve the update without downloading or replacing anything:
If the requested version is withdrawn or absent from the governed release index, choose the active stable version instead. Do not bypass checksum or withdrawal failures.

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Recover from an interrupted update

Retry after network access returns. The current binary and sysroot remain in place until the immutable installer validates and stages the full replacement. If the release team announces a rollback, use only the exact command in that incident notice; a downgrade requires --force.

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Fix VS Code startup

The sifr.sifr-vscode extension uses the compiler as its language server. Confirm that the configured binary supports the extension range >=0.1.0,<0.2.0:
Stop the second command after it starts waiting for protocol input. In VS Code, check Sifr: Show Language Server Logs and set sifr.lsp.path to the same standalone binary reported by command -v sifr.

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Verify platform compatibility

Stable standalone artifacts require macOS 15.0 or glibc 2.39. If your platform is older or is not one of the four supported targets, the standalone installer fails before replacing an existing toolchain.