[BUG] skillCreationEnabled not being enforced in the Desktop App

### Preflight Checklist

- [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) 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?

Currently utilizing Claude Apps Gateway for the desktop app specifically Cowork. The following variable skillCreationEnabled has been set to false within the desktop section of the gateway. However, the desktop app does not seem to enforce this variable, as even though the variable is set to false users are still able to create and upload their own skills.

### What Should Happen?

Once this variable is set to false, users should not be allowed to create/upload skills.

### Error Messages/Logs

```shell

```

### Steps to Reproduce

Utilize Claude App gateway for the Desktop app. Within the gateway configuration have this setting

managed:
--
policies:
- match: {}
desktop:

skillCreationEnabled: false

### Claude Model

None

### Is this a regression?

Yes, this worked in a previous version

### Last Working Version

_No response_

### Claude Code Version

2.1.273

### Platform

Anthropic API

### Operating System

macOS

### Terminal/Shell

Terminal.app (macOS)

### Additional Information

_No response_

Start by reproducing the Desktop App behavior with an Anthropic Apps Gateway configuration where desktop skillCreationEnabled is false, then trace how that policy reaches skill creation and upload actions. Done means users cannot create or upload skills when the setting is disabled, while the existing behavior remains available when it is enabled.

Written by the indexing model from the issue text.