tengu_artifact_thumb_direct
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.208 and was gone by v2.1.211.
Default false. Turns on thumbnail capture for the inline upload lane: artifact publishing starts a thumbnail capture of the page there, skipped when the Chrome preflight fails or the page is too large. The signed upload lane captures a thumbnail whenever the server provides a thumbnail upload URL, regardless of the flag; with the flag on, a failed signed PUT that falls back to inline keeps that running capture for the fallback instead of cancelling it with the reason index_put_failed.
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.210 bundle, and it can be wrong.
In the changelogs
0No changelog entry here has ever named it. That is a statement about what has been written, not about the name: it has been in the build since v2.1.208 without anybody writing a line about it.
Gate readings
0No 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.
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
2Build by build
89One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
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.