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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.251 Feeds RSS JSON llms.txt
Reading a new release v2.1.251 Analysing changes · 2/5 Deeper second pass · 0/5 agents 427 findings $12.75 so far

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.

Reference / Feature flags

tengu_artifact_preview

A Claude Code feature flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

What it is

An artifact preview action would screenshot a page locally at several widths, but it cannot run here.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.247.

Presence across releases

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

Gate readings

No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.

Changelog entries naming it

  1. v2.1.247Artifact preview: a local headless-Chrome render check that is not compiled into this build

    An artifact preview action would screenshot a page locally at several widths, but it cannot run here.

    gate cited by this entry

Documentation pages

None of Anthropic's documentation pages this site has a copy of carries this name.

Names beside it

Every feature flag in the inventory starting tengu_artifact, up to twelve of them.

tengu_artifact_hljs_highlightArtifact syntax highlighting and mermaid diagrams are now always on; three other gates were renamed and stay off. 2.1.212 tengu_artifact_mermaid_diagramsArtifact syntax highlighting and mermaid diagrams are now always on; three other gates were renamed and stay off. 2.1.202 tengu_artifact_reject_breakerThe Artifact tool stops looping after three identical failures and reports the problem to you. never mined tengu_artifact_thumb_directNo description from anybody. 2.1.208 tengu_artifact_verifyClaude could read console errors and failed loads from real viewers of an artifact, but it's switched off. never mined tengu_artifact_verify_republishClaude could read console errors and failed loads from real viewers of an artifact, but it's switched off. never mined

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the feature flag does. All feature flags.