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Sweep 08 Oct 2026 · 18:53Z Build v2.1.295 516 read Stable v2.1.286 Latest v2.1.295 Next v2.1.295 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.290 ·

A new experiment switch with no visible effect yet

Claude Code now names a new server-controlled experiment switch whose purpose is not shown

Under the hood Internal Changes
JSON All of v2.1.290
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
InternalsArea: what it touches
Internal ChangesKind: in v2.1.290,
Internal ChangesSection of the release

Unclear What this switch controls and its default value are not known.

What

Claude Code now contains a new experiment switch named tengu_jaunty_forest. Switches like this are turned on or off from Anthropic's servers. Nothing in this build shows what it controls or what it falls back to.

Why

There is nothing for you to do. It is a marker for a feature that is not visible yet.

Read from
Feature flag
tengu_marble_heron Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.290: not a boolean we can read

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.290. It isn't a statement about your account. What a flag value here can and cannot tell you

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhat this switch controls and its default value are not known.

See this entry in the whole of v2.1.290 →

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