On October 1, 2026, Anthropic announced via its official developer account ClaudeDevs that Claude Code is getting a new extension mechanism called mods, with the official developer blog claude.dev publishing the getting-started tutorial "Getting started with Claude Code mods" the same day. This isn't another plugin store — it's a mechanism that lets developers rewrite Claude Code's own behavior directly.
Per the official tutorial, each mod is a small JavaScript or TypeScript module. It works on three levels: rewriting or replacing Claude Code's default behavior, adding custom logic to commands and workflows, and even drawing custom UI. The official example is a "Token Weather" plugin — a weather card rendered in the interface showing remaining context-window capacity in real time. The tutorial also reveals an interesting detail: some of Claude Code's built-in features, such as AGENTS.md support and the /diff pane, are themselves implemented as mods. That means mods aren't a cosmetic "skin" capability but the same extension primitives Claude Code uses internally.
For distribution, mods ship inside plugins: once written, they're bundled into a plugin and installed via /plugin, working across both the CLI and the desktop app. You don't have to hand-write everything from scratch either — Anthropic says you can let Claude build the mod for you: describe what you need, and Claude Code generates the mod code. It requires Claude Code 2.1.287 or later, and mods are enabled by default.
One security note in the official tutorial deserves emphasis: mods run with the same permissions as Claude Code itself, so install only from sources you trust. Installing mods only from people or organizations you trust follows the same logic as tiering Claude Code's permissions with /permissions: the more capable the mechanism, the more the authorization boundary matters.
The real weight of this update isn't personal productivity but workflow sedimentation. The plugin system solved distribution of capabilities; mods solve customization of behavior — the former gives you more building blocks, the latter lets you redraw the blueprint. Prompts, checklists, and team conventions that used to live scattered across individual habits can now be written as mods and shipped with plugins, so a new hire inherits the whole way of working just by installing a plugin. Claude Code's trajectory is shifting from "a better tool" to "a platform that can be remade."
