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. Brush is labeled as a beta and is described as under active development, expected to improve how people build prompts in Claude.

As of November 12, 2026, Anthropic had published no announcement about Brush on its blog or in its product updates, nor has it released public documentation explaining how the feature works.

Possible connections to Sketch

The leading theory is that Brush may be connected to an earlier feature called 'Sketch.' Under that theory, Brush could be an evolution of Sketch, or possibly its replacement. Neither version has been verified.

The name itself has fueled a second line of conjecture. Some observers think Brush may involve visual or iterative prompt refinement, meaning adjusting a prompt in stages rather than rewriting it from scratch. That remains an educated guess based on a single word.

Recent Claude interface changes

Brush is not arriving in isolation. Claude's interface has picked up other new features recently. Interactive connectors were introduced around November 10, 2026, putting them roughly two days ahead of when Brush appeared in development builds.

For everyday users, the immediate impact is zero. Brush is a beta in development, and there is no public release date or rollout plan on record. Features spotted in development interfaces do not always ship in the form they first appear, and some never ship at all.

For developers and teams who use Claude heavily, two interface changes surfacing within days of each other suggest a steady cadence of product work on the Claude front end.