Claude Code's new Mods system lets developers rewrite the AI coding tool from the inside

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Anthropic released "Mods" for Claude Code, essentially middleware that runs directly inside the tool. The plugin-based system lets developers change how Claude Code looks and works. Mods are JavaScript or TypeScript functions that hook into specific events, from tool calls and user prompts to UI rendering. That means developers can add custom panels next to the chat, intercept tool calls, or wire