Claude Cowork Preview Flaws: 403 Errors, Broken Sync & Plugin Failures Exposed

Claude Cowork Preview: A Real User’s Experience With Three Critical Flaws Summary: Claude Cowork is Anthropic’s experimental AI collaboration feature built into the macOS client. Its architecture centers on “local files as the core, supported by multi-platform Connectors and MCP-based plugins.” Hands-on testing reveals three significant limitations in this preview version: failure to enable TUN mode on proxy tools results in 403 errors; Project modifications are written only to a local session without real-time cloud sync; and the system cannot invoke already-installed Claude Skills, only a handful of built-in plugins. These shortcomings create a sharp contrast with the high-quality output …