### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### What happened?

**What happened?** The skills detail page has three bugs that make the setup instructions non-functional for end users.

The "How to Use" tab shows `/plugin marketplace add {source}` as the install command. This format attempts to add a new marketplace source rather than install a plugin. Running it in Claude Code does nothing useful.

The "One-time setup" tab generates a ~/.claude/settings.json snippet where `extraKnownMarketplaces.litellm.source` is a flat string ("url"). Claude Code requires this to be a nested object. Using the generated snippet causes Claude Code to reject the entire settings file with: `extraKnownMarketplaces.my-org.source: Expected object, but received string` and skip it entirely.

The snippet also uses "my-org" as the marketplace key instead of "litellm", which does not match the name the proxy returns in marketplace.json, so even a manually corrected snippet would register the marketplace under the wrong name.

**What did you expect to happen?** The install command should be `/plugin install {name}@litellm`. The setti…