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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.309 ·

A widely used server switch now counts as on even when it cannot be read

A server switch checked in many places now counts as on when no value can be read at all, not only when the server sends nothing

Under the hood Internal Changes
JSON All of v2.1.309
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 v2.1.309,
Internal ChangesSection of the release

Unclear It is not clear which features this switch controls.

What

Claude Code checks a server-controlled switch, tengu_foamy_spring, in many places. Before this change, the check counted it as on unless the server set it to false. It now goes through a shared check that also counts it as on in two more cases:

  • when there is no way to read server settings at all
  • when reading the setting fails with an error
Why

The switch is on unless the server explicitly turns it off, and that now holds even when settings cannot be read. Many parts of Claude Code consult it, so whatever it controls is in effect for anyone the server has not switched off.

Read from
Feature flag
tengu_foamy_spring 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 v2.1.309: 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 v2.1.309. 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 doubtIt is not clear which features this switch controls.

See this entry in the whole of v2.1.309 →

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