What
Introduces the concept of built-in plugins that ship with Claude Code and cannot be uninstalled or updated by users.
Details
- Built-in plugins are identified by the
@builtinsource suffix - They can be enabled or disabled via user settings but not removed
- Attempting to update or uninstall shows: "Built-in plugins cannot be updated or uninstalled."
- Built-in plugins can provide skills, hooks, and MCP servers just like regular plugins
Evidence
Built-in plugin system (search for "Built-in plugin", "@builtin", "Built-in plugins cannot be updated or uninstalled")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.