Anthropic is building a beta Brush tool for Claude’s prompt composer

The feature surfaced in development interfaces on November 12, 2026, but Anthropic has not officially said what it does Anthropic is working on a new beta feature called Brush for the Claude prompt composer, the box where users type and shape their requests to the AI model. The feature appeared in development interfaces on November 12, 2026. Anthropic hasn’t announced it, which leaves everyone else guessing what the paintbrush is for. Brush is labeled as a beta and is described as under active development. It is expected to improve how people build prompts in Claude. Beyond that, the company has kept the details to itself. The confirmed facts fit on an index card. Anthropic is developing Brush. It is aimed at the prompt composer. It carries a beta tag.

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