Claude Code introduces mods to run JavaScript event handlers inside the tool
Claude Code mods let users write JavaScript or TypeScript event handlers directly inside the tool, replacing older configuration-based hooks. The new system, announced in October, runs as plugins and can observe, rewrite, or block events like tool calls or prompt sends. Unlike hooks, which execute shell commands externally, mods operate internally, enabling features like custom UI elements, new…
Key points
- Claude Code mods let users write JavaScript/TypeScript event handlers inside the tool, replacing older configuration hooks
- Mods can observe, rewrite, or block events like tool calls but do not guarantee perfect blocking—test cases show bypasses
- Author retains 20 configuration hooks for blocking actions but may use mods for interactive features like banners or custom commands
How to create Claude Code mods: The mechanism to stop AI in 3 files, and the line on whether to migrate existing hooks
note.com · 13 October 2026
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