Anthropic Adds TypeScript 'Mods' to Claude Code for In-Process Customization

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On October 1, 2026, Anthropic released mods, small TypeScript plugins that run inside Claude Code and hook into events such as prompt submission, tool calls, and interface rendering. Previously, users could customize the tool only through settings files, slash commands, or external shell hooks. Mods can rewrite prompts, block or approve tool calls, redact secrets from output, and add new interface elements like panels and buttons. They are distributed as plugins and work in the terminal from version 2.1.287 and in the Desktop app's Code tab from version 2.1.286, enabled by default in those versions. Users can also ask Claude Code itself to write and install a mod.

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