When calling client.beta.skills.create from Windows using Anthropic's _files APIs, as this sample does , I get a BadRequestError("Error code: 400 - {'type': 'error', 'error': {'type': 'invalid_request_error', 'message': 'Skill contains path with invalid characters'},..

I did not see anywhere in the docs that posix paths are required. Did I miss it?
If I did not miss it, It might be useful to document that, or to amend the _collect_files function.

Cheers!!
Jaime