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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.45 17 Feb 2026

AskUserQuestion Preview/Markdown Support

What

When asking users questions with multiple options, Claude Code can now display a markdown preview pane to show code snippets, ASCII mockups, or diagrams alongside each option.

Usage: When an option in AskUserQuestion includes a markdown field, the UI switches to a side-by-side layout with options on the left and a preview panel on the right.

Details

Previews are displayed in a monospace box when an option is focused
Supports multi-line text with newlines for ASCII art, code, or diagrams
Only supported for single-select questions (not multiSelect)
Users can also add free-text notes on their selection via the n key

Evidence

AskUserQuestion option schema now includes markdown field (search for "Optional preview content shown in a monospace box")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.45 →