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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 · 0/5 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_device_bind_attach

A Claude Code feature flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

What it is

A remote session can be pinned to one device, refusing attach from anywhere else.

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

Presence across releases

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

Gate readings

No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.

Changelog entries naming it

  1. v2.1.228Remote sessions can be pinned to a single device

    A remote session can be pinned to one device, refusing attach from anywhere else.

    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_device_bind, up to twelve of them.

tengu_device_bind_accountA token from the wrong account now says so and tells you to log out. never mined tengu_device_bind_failedCloud sessions can be bound to your machine so local tools only run there, currently gated off. never mined tengu_device_bind_preparedRemote sessions can be tied to the exact machine that started them using a per-account signing key. never mined tengu_device_bind_skippedCloud sessions can be bound to your machine so local tools only run there, currently gated off. never mined tengu_device_bind_title_latchedThe automatic session rename after device binding is now signed. 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.