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

Claude Code Mods is a developer middleware system for customizing the AI coding interface. Developers can use JavaScript or TypeScript to build custom panels, intercept tool calls, and add new commands directly inside Claude Code. This update gives engineers granular control over their AI coding workflows and environment behavior.

The Decoder·Oct 3, 2026

Opening Kapyn…