Source Intelligence
Follow Discord
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 · 4/5 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_cobalt_plinth_madder

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.242, including the newest one read.

What it is

Several artifact feature switches were renamed and re-gated, discarding any prior rollout.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.242.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.242 – 2.1.243 2 releases in the build — bool:true

A row reading never mined is a release with no archived bundle behind it. Nothing was read out of it, so nothing here says whether the name was in it. A declared type or a default is only ever what that release's own bundle stated.

Gate readings

ReleaseResolvedThis accountAnonymousCompiled default
v2.1.247 Off in both readings off off not a boolean we can read
v2.1.242 Off in both readings off off off

Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.

Changelog entries naming it

  1. v2.1.247Artifact relay skips bot-driven sessions

    Bot-driven sessions no longer relay artifact requests; they go direct or not at all.

    gate cited by this entry

  2. v2.1.242Cobalt-plinth flags renamed again

    Several artifact feature switches were renamed and re-gated, discarding any prior rollout.

    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_cobalt_plinth, up to twelve of them.

tengu_cobalt_plinthPR review artifact pages can show a pinned button that approves the pull request from your GitHub account. 2.1.172 tengu_cobalt_plinth_alderClaude can now read back a published artifact's contents; browsing, multi-file publishing and deletion are built but off. 2.1.239 tengu_cobalt_plinth_aspenThe preview browser is locked to the local server and refuses to run if the lock fails. never mined tengu_cobalt_plinth_brackenYou could start a private artifact from a published template, but two server switches keep it shut here. 2.1.216 tengu_cobalt_plinth_datavizThe chart skill hint now only appears if the dataviz skill is actually installed. 2.1.198 tengu_cobalt_plinth_directArtifact availability now hinges on one gate, and direct upload kicks in for create paths. 2.1.172 tengu_cobalt_plinth_fennelBot-driven sessions no longer relay artifact requests; they go direct or not at all. never mined tengu_cobalt_plinth_fernNo description from anybody. 2.1.174 tengu_cobalt_plinth_hazelCreating an artifact from a type inside a cloud session sits behind a second switch, off. never mined tengu_cobalt_plinth_larchYou could start a private artifact from a published template, but two server switches keep it shut here. 2.1.236 tengu_cobalt_plinth_laurelNo description from anybody. 2.1.212 tengu_cobalt_plinth_mossPublishing over a stale artifact now fetches the current version so Claude can merge and retry. 2.1.227

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.