[FEATURE] Allow deleting locally installed plugins and custom MCP connectors in Cowork

Problem

There is no way to delete locally installed plugins or custom MCP connectors from the Cowork desktop app once they've been added.

Plugins: Uploaded via .zip through the plugin management UI. Once installed, there's no delete/uninstall option — only an enable/disable toggle.

Custom MCP connectors: Added via Settings → Connectors → "Add custom connector." Once created, there's no way to remove them. The connector config appears to be stored internally by the Electron app (not in a user-accessible JSON file), so manual deletion isn't possible either.

Why this matters

During iterative development of MCP servers and plugins, you frequently need to tear down and recreate connectors (e.g., when a tunnel URL changes, or when migrating from a temporary to a stable endpoint). Having stale connectors that can't be removed creates confusion — especially when both old and new connectors expose the same tool names or slash commands, leading to potential routing conflicts.

Specific scenario: I built a WhatsApp MCP server, added it as a custom connector, then later packaged the same functionality as a plugin with a /whatsapp slash command. Now I have both an undeletable connector and a plugin that both reference WhatsApp tools, with no way to clean up the old one.

Expected behavior

• Plugins: Right-click or menu option to uninstall/delete an uploaded plugin
• Custom connectors: Delete button in the connector settings panel (next to the existing edit flow)

Environment

• Claude Desktop (Cowork mode)
• macOS 15.3.1 (Sequoia)
• March 2026