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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 v2.1.221 ·

Periodic feature-flag refresh loop with a remotely tunable interval

Feature flags now refresh in the background every six hours instead of only at startup.

Under the hood Internal Changes
JSON All of v2.1.221
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
InternalsArea: what it touches
Internal ChangesKind: in v2.1.221,
Internal ChangesSection of the release
What

GrowthBook feature flags are re-fetched on a background schedule rather than only at startup.

Details
  • The loop is aborted at process exit.
  • Interval defaults to 360 minutes; a remote value is clamped to 5–360 minutes and given plus or minus 10% jitter.
  • When a remote value is present, a second refresh fires after a random delay of up to 5 s if nothing changed in between.
  • Errors back off 60 s.
  • Gate is tengu_gb_refresh_interval_minutes, fallback null, which yields a plain 6-hour interval and no double-refresh.
Evidence

tengu_gb_refresh_interval_minutes

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

Read from
Feature flag
tengu_gb_refresh_interval_minutes 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 v2.1.221: 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 v2.1.221. It isn't a statement about your account. What a flag value here can and cannot tell you

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_gb_refresh_interval_minutes

See this entry in the whole of v2.1.221 →

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