Claude Code Plugins: extensions and marketplaces for Claude Code

Anthropic introduces a plugin system in public beta for all Claude Code users. A plugin is a package that can contain any combination of slash commands (the /review-style commands), subagents, MCP servers and hooks (actions that run at specific points in the agent's workflow).

The idea is to share setups: a team can package its commands and tools and have colleagues install them with one command. Plugins toggle on and off as needed, so they don't take up context when they aren't in use.

Plugins are distributed through marketplaces: all it takes is a Git repository with a catalog file. Anthropic publishes some example plugins (PR review, security guidance, Claude Agent SDK development, creating new plugins) and points to the first community marketplaces.