Anthropic describes a mod as a function that hooks one of the events Claude Code emits, such as calling a tool, asking for permission, or drawing part of the screen. A mod can run before the event, after it, or instead of it.
In the News: October 1, 2026 (Extra 4)
Anthropic's Claude Code mods let plugin code rewrite tool calls and answer permission requests. The post says mods are not sandboxed.
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