Claude Code opens to TypeScript mods

The move turns Claude Code from a fixed coding agent into something users can extend themselves. Anthropic's developer account framed mods as a way to write one with a few lines of TypeScript or have Claude build it, and said they ship inside plugins installed via /plugin in the CLI or desktop app. That packaging matters: custom behavior and UI arrive through the same plugin route users already know.

Anthropic showed sample mods to illustrate the range. One called Blast Radius displays an explanation on the right side of the screen when Claude tries to run a high-risk command such as "rm -rf", listing the command name and the affected files. Another, Replay Theater, records Claude's file operations and displays the differences.

What this means in practice hinges on how much modders can build against Claude Code's internals without breaking on updates, and on whether the sample mods inspire a wider set of community-built extensions. For teams that already run the agent daily, the appeal is fitting it to their own workflow rather than waiting for Anthropic to add features.