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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.251 ·

Off-by-default artifact frame relay bypass

An alternate way of serving artifact content exists but is unreachable in normal use.

Nothing to try yet In Development
JSON All of v2.1.251
Nothing to try yetTier: how much it should matter to you
1Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
ArtifactsArea: what it touches
In DevelopmentKind: in v2.1.251,
In DevelopmentSection of the release

A frame-relay bypass sits behind a remote flag defaulting false plus remote-session and bot-context conditions.

What

A new flag, tengu_cobalt_plinth_linden, controls an extra path for serving artifact content that bypasses the usual frame relay. It defaults to false and additionally needs a remote Claude Code session and an internal bot-context marker, so nothing in normal use reaches it.

Evidence

tengu_cobalt_plinth_linden

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from
Feature flag
tengu_cobalt_plinth_linden Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.251: not a boolean we can read

Read once, for one account on one subscription tier, against v2.1.251. It isn't a statement about your account. What a flag value here can and cannot tell you

What has happened since
Flag reading moved The flag server now returns on for tengu_cobalt_plinth_linden, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns off for tengu_cobalt_plinth_linden, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns nothing at all, having stopped carrying it for tengu_cobalt_plinth_linden, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.

See this across every release →

How sure we are
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this buildNew in this build: tengu_cobalt_plinth_linden

See this entry in the whole of v2.1.251 →

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