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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 v2.1.199 2 Jul 2026

Plan Artifact Template: CDS Design Tokens and TAB_TITLE Slot

The plan artifact HTML template has been upgraded with the official Anthropic CDS (Component Design System) token set and a new title control slot.

Details

Added {{TAB_TITLE}} slot: controls the browser <title> element separately from the document heading {{TITLE}}. The .md publish path sets it to the filename while the visible <h1> shows the document heading
Replaced hand-coded CSS color literals with vendored @ant/cds design tokens (the full token CSS is embedded verbatim and drift-tested in CI)
Adds syntax highlighting for code blocks using highlight.js with language detection
The plan-artifact skill instructions updated to reflect the new four-slot fill contract ({{TITLE}}, {{TAB_TITLE}}, {{EYEBROW}}, {{SUMMARY}})

Evidence

(search for "TAB_TITLE", "BEGIN vendored @ant/cds tokens", "artifact-plan.html")

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

See this entry in the whole of v2.1.199 →