[BUG] In Claude Desktop's third-party inference mode, files other than `SKILL.md` are ignored when importing Agent Skills

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

In third-party inference mode (such as AWS Bedrock) of Claude Desktop, when importing an Agent Skill that contains files other than SKILL.md (such as references/*.md) via "Settings" -> "Skills" -> "Add" -> "Upload a skill", all files other than SKILL.md are ignored.

What Should Happen?

Files other than SKILL.md, such as references/* and assets/*, are also imported.

Error Messages/Logs

No error messages or logs.

Steps to Reproduce

1. Create a zip archive containing SKILL.md and references/*.md
2. Configure third-party inference in Claude Desktop
3. Import the zip archive via "Settings" -> "Skills" -> "Add" -> "Upload a skill"
4. Only SKILL.md is copied to the skill directory

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.32885.1

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

This issue reproduces in the same way on both Windows and macOS.