I think that's only what happens for binary (tool) dependencies that are built on their own, though. For library dependencies that you're only building against,

I think that's only what happens for binary (tool) dependencies that are built on their own, though. For library dependencies that you're only building against, their "toolchain" directive would be ignored, because they're not the main module (https://go.dev/doc/toolchain https://go.dev/doc/toolchain).