Source Intelligence

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.

All of v2.1.219 Home All releases olderv2.1.218 v2.1.220newer
Claude Code v2.1.219

Workshop skill gains a direct-HTML authoring lane, and it is now the default

Not switched on
Useful2 Signal3
Skills

The workshop skill would now write HTML documents by default, with a strict publish check, but isn't offered.

A rewritten HTML-first workshop skill sits behind gate tengu_gable_onyx_sluice plus Artifact tool capabilities, all off here.

Feature flag
tengu_gable_onyx_sluice Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.219: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.219. It isn't a statement about your account. What a flag value here can and cannot tell you

What

The bundled workshop skill text was rewritten around two authoring lanes, with HTML promoted over markdown, though the skill is not offered on this build.

Details
  • v2.1.218 said flatly that the workshop document is markdown and stays markdown for its whole life.
  • A new "Choosing the lane" section tells the model to copy a template to a path ending in .workshop.html, fill it, and publish that file.
  • The markdown .workshop.md lane becomes secondary, reserved for when the user asks for markdown or the document will be dominated by quoted external content.
  • Publishing runs a structural verifier on the final payload of every publish and refuses out-of-contract pages: fixed scripts, no inline on* handlers, no iframes/forms/base/link, escaped quoted content, island and markup agreement.
  • Registration uses isEnabled backed by gate tengu_gable_onyx_sluice with in-source fallback false, so absent a remote value the skill is not offered; it additionally needs the Artifact tool's capabilities and the read_page_data action.
Evidence

Default to the TEMPLATE-HTML lane

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

See this entry in the whole of v2.1.219 →