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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_chrome_tab_group_close

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.239, including the newest one read.

What it is

Chrome tabs a session opened are closed when you leave it, unless they hold real content.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.239.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.239 – 2.1.243 5 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
v2.1.239 Not enough to say no value returned no value returned 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. v2.1.239Chrome tabs opened by a session are closed when it ends

    Chrome tabs a session opened are closed when you leave it, unless they hold real content.

    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_chrome, up to twelve of them.

tengu_chrome_auto_enableAutomatic Chrome integration stays disabled; only its decision function changed shape. 2.1.138 tengu_chrome_install_upsellNo description from anybody. 2.1.206 tengu_chrome_tool_call_disconnectedThe browser integration now reports connection and mismatch events, including tool calls attempted while disconnected. never mined tengu_chrome_tools_addedRunning the Chrome extension's MCP server now logs how many browser tools were added, once per session. 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.