[BUG] Skills are not loading to Claude Cowork on Mac
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?
When trying to upload new skills into Claude cowork, by dragging and dropping a .skill file into the capabilities section, inside of Claude Mac application I receive an error message saying "Internal server error".
I'm running the latest version of Claude desktop for Mac, and I tried restarting it several times, however, the error persists.
This is a critical issue as it is on the critical path of several projects. I'm working on with Claude cowork.
Just to be certain, it's not a specific skill issue, I tested older skills that previously loaded successfully to Claude on Mac, and they're generating the same error right now.
What Should Happen?
Uploading skills to the capabilities section, should make them available in Claude cowork seamlessly.
Error Messages/Logs
Steps to Reproduce
- Create a new skill or update an existing one
- Navigate to the capabilities section of the settings on Claude coworker on Mac.
- Drag the scale file into the relevant area.
- It generates an error message.
Claude Model
None
Is this a regression?
Yes, this worked in a previous version
Last Working Version
_No response_
Claude Code Version
Claude 1.1.3189 (1b7b58) 2026-02-14T00:09:46.000Z
Platform
Anthropic API
Operating System
macOS
Terminal/Shell
Terminal.app (macOS)
Additional Information
<img width="521" height="408" alt="Image" src="https://github.com/user-attachments/assets/24cde99c-3626-4563-bb2f-1129263e35d3" />
16 Comments
Found 2 possible duplicate issues:
This issue will be automatically closed as a duplicate in 3 days.
🤖 Generated with Claude Code
This happened to me earlier today with claude.ai. Even the simplest skills or manually entered ones returned this error.
Having this issue as well
yup
Same happened to me 3 hours ago
it is still happening to me on my end, it refuses to allow me to upload a updated skill that I've recently updated.
Same problem here! I cannot use, replace or remove the skill. It shows Internal Server Error
!Image
I'm getting the same issue when trying to upload a new skill, and this has been happening since yesterday. I am using a windows 11 pro
only able to use skills in cowork when i manually upload the .zip file into a specific chat, for anyone else stuck with this rn
Seems to be solved now. Drag and drop the skills work again and execute without problems
Hi, Felix from Anthropic here. We're seeing intermittent issues and are investigating. Apologies for the trouble!
Same here, Claude Cowork is not working,
I am getting Claude CoWork hanging forever at launching a skill.
<img width="745" height="312" alt="Image" src="https://github.com/user-attachments/assets/0cff8d47-12ae-4657-ad23-0da6c033b692" />
I am still experiencing the same "interal server error" issue. Skills are amazing - but only if it works!
Closing for now — inactive for too long. Please open a new issue if this is still relevant.
This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.