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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_send_file

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.227, including the newest one read.

What it is

Sending files between sessions now fails with a clear "not available in this session" message.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.227.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.227 – 2.1.243 16 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
v2.1.227 read on another version Not enough to say no value returned no value returned 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. v2.1.227Cross-session file transfer is gated off with a specific message

    Sending files between sessions now fails with a clear "not available in this session" message.

    gate cited by this entry

  2. v2.1.227SendFile tool moved from hard-off to a feature flag

    Sending files to another Claude session went from hard-off to a flag the server can flip.

    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_send, up to twelve of them.

tengu_send_user_fileUnder zero data retention, the file-send tool no longer appears at all. 2.1.142

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.