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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 v2.1.251 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_ccr_reactivation_beat

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.228, including the newest one read.

What it is

Remote sessions gain reconnect and reactivation heartbeats plus stale-connection recovery, all off here.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.228.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.228 – 2.1.243 15 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
v2.1.228 read on another version On for this account, and not off by default on on 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. v2.1.228Remote-control heartbeat and stale-epoch recovery, all off

    Remote sessions gain reconnect and reactivation heartbeats plus stale-connection recovery, all off here.

    gate cited by this entry

  2. v2.1.228Remote control gains reconnect and reactivation heartbeats, all off by default

    Remote control adds reconnect, reactivation and idle heartbeats, each behind a gate that defaults off.

    gate cited by this entry

  3. v2.1.228Idle tracking and a reactivation heartbeat for remote sessions

    Remote sessions can measure idle time and send an extra beat when you come back, if the server allows.

    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_ccr, up to twelve of them.

tengu_ccr_bridgeNo description from anybody. 2.1.138 tengu_ccr_bundle_max_bytesNo description from anybody. 2.1.138 tengu_ccr_bundle_seed_enabledIf a folder is too big to seed a cloud session, you now see the size, cap and biggest files. 2.1.227 tengu_ccr_bundle_uploadMost of this release's changed code is the build system moving modules, not features changing. never mined tengu_ccr_delta_rehydrateNo description from anybody. 2.1.181 tengu_ccr_handoff_metadataHanding a session to the cloud can include a snapshot of your checkout, off by default. 2.1.242 tengu_ccr_idle_heartbeatRemote sessions can detect a dead connection through probes and force a reconnect, off by default. 2.1.227 tengu_ccr_init_park_reportA background worker can now report at startup that it needs your attention rather than just idle. never mined tengu_ccr_no_subscriber_flush_msSubscriber-aware flush buffering is disabled by its default of zero. never mined tengu_ccr_orphan_restore_wakeIf a container restart kills background work, your session now wakes up and Claude is told what was lost. never mined tengu_ccr_orphan_restore_wake_shellsIf a container restart kills background work, your session now wakes up and Claude is told what was lost. never mined tengu_ccr_overlay_bundleA cloud session can start from your local commits instead of always pulling the remote copy. 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.