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So this construct here: <https://github.com/pantsbuild/pants/blob/main/src/python/pants/core/goals/tailor.py#L146>

This would imply that I can only tailor new Targets iff the `source` or `sources` field of the Target has a default value. Otherwise I can’t. Thus, if my putative sources are Treefiles, which are random YAML or JSON files and can happily be stored next to each other in the same directory and don’t have a defined name per se, I can’t actually work with the `tailor` goal because I can’t know in advance what the filename might be.

You can find them out at `tailor` time, by, for example - file extension

<https://github.com/pantsbuild/pants/blob/main/src/python/pants/backend/cc/goals/tailor.py>

It can get dicey if they're super generic, not language specific - but maybe there is a way to cue off of something else to know that you want them under this source specifically.

Or maybe for those files, a `files` or `resources` would suffice

That forces an indirection via another Target though.

You can get around it by not using `PutativeTarget.for_target_type` but…