Anthropic Releases Mods System for Claude Code AI Tool
The new system allows developers to deeply customize and rewrite the behavior of Claude Code from the inside.
• Anthropic released a new Mods system for Claude Code that acts as internal middleware.
• Developers can write JavaScript or TypeScript functions to alter prompts, tool calls, and UI rendering.
• The first official plugin, You Should Know, launches a separate agent to watch AI output.
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October 3, 2026 42