The guard's toolchains value carries the sha256 of the go or node program found on the path (read again when the version changes); toolchain-reported is said on the build seat's subject of the node at start and on each change of version, recipe or digest; a build's ToolchainUsed names the digest. The legacy toolchain.reported emit and its stream go: nobody consumes them. Builds: design 47 G §492, §472, §466 (lead answer A-152) Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h