Source Intelligence

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.

All of v2.1.221 Home All releases olderv2.1.220 v2.1.222newer

Periodic feature-flag refresh loop with a remotely tunable interval

Under the hood
Useful2 Signal0
Internals

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

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

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.

See this entry in the whole of v2.1.221 →