tengu_sunny_locket
A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.283, including the newest one read.
A remotely controlled option can compact a long, idle conversation shortly before its one-hour prompt cache runs out
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.283.
In the changelogs
2Releases whose published page names tengu_sunny_locket.
-
v2.1.283
Idle sessions can be compacted before the prompt cache expires
A remotely controlled option can compact a long, idle conversation shortly before its one-hour prompt cache runs out
gate cited by this entry
-
v2.1.283
Groundwork for compacting a conversation while it sits idle, off by default
Claude Code can compact an idle conversation before its one-hour cache expires, but this is off unless switched on remotely
gate cited by this entry, found in this entry's text, named in this entry
Gate readings
1| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.283 read on another version | Not enough to say | no value returned | no value returned | not a boolean we can read |
Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.
Flag server, over time
2| Read as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| this account | {"mode":"off"} | 2026-09-24T03:40:04Z | 2026-09-28T06:45:05Z | v2.1.281 to v2.1.283 |
| anonymous | {"mode":"off"} | 2026-09-24T03:35:04Z | 2026-09-28T06:45:05Z | v2.1.281 to v2.1.283 |
One row per unbroken stretch of one reading, newest first, from snapshots taken every twenty-five minutes or so. No longer carried is not off: it means the flag server stopped returning the gate at all, which is what a retired experiment looks like. The version column is what was installed when the reading was taken, not what caused it.
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
1Build by build
1One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the feature flag does. All feature flags.