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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 v2.1.250 Feeds RSS JSON llms.txt

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_vellum_anchor

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.229, including the newest one read.

What it is

The out-of-credits message can add a "progress saved" note, off unless a server enables it.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.229.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.229 – 2.1.243 14 releases in the build — bool:false

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
v2.1.236 Off in both readings off off on
v2.1.232 read on another version Off in both readings off off on
v2.1.229 read on another version Off in both readings off off on

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. v2.1.236Visible notice when approaching the 5-hour usage limit

    You could be told when you are near the 5-hour usage limit instead of Claude just wrapping up.

    gate cited by this entry

  2. v2.1.232Rate-limit checkpoint can commit in-progress work to a hidden git ref

    Before a usage limit cuts you off, your work can be committed to a hidden git ref with resume notes.

    gate cited by this entry

  3. v2.1.229Rate-limit banner can say "progress saved"

    The out-of-credits message can add a "progress saved" note, off unless a server enables it.

    gate cited by this entry

  4. v2.1.229Usage-limit messages can be told your progress was saved

    Usage-limit messages can append "progress saved", but callers only pass it when a server flag is on.

    gate cited by this entry

  5. v2.1.229Nudge to wrap up when your 5-hour usage is nearly spent

    Claude could be told to wrap up and list remaining work when your usage is nearly spent.

    gate cited by this entry

  6. v2.1.229Rate-limit banner can queue an automatic continue at reset

    Hitting a five-hour limit could queue your turn to resume automatically at reset, currently off.

    gate cited by this entry

  7. v2.1.229Wrap-up hint when you are close to the usage limit

    Past 95% of five-hour usage Claude could be told to checkpoint and list remaining work, off 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_vellum, up to twelve of them.

tengu_vellum_ashNo description from anybody. 2.1.202 tengu_vellum_lanternNo description from anybody. 2.1.138 tengu_vellum_sidingNo description from anybody. 2.1.143

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.