Claude Code adds mods that can rewrite how the agent works
Plugins can now change prompts, tool calls and the screen of Anthropic’s coding agent. Anthropic warns that mods run with the user’s permissions and are not sandboxed.
Anthropic added Claude Mods to its coding agent Claude Code in version 2.1.287 on October 1. Mods are small JavaScript or TypeScript functions, shipped in plugins, that react to events inside the agent. Anthropic’s documentation says they run with the user’s permissions and are not sandboxed.