tengu_sedge_lanternA Claude Code feature flag, read out of the shipped bundle.
It was in the build from v2.1.138 and was gone by v2.1.223.
/recap and the Session recap settings entry now work for everyone without an experiment flag.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.223 .
First seen v2.1.138 9 May 2026
Last seen v2.1.222 4 Aug 2026, gone by v2.1.223
Builds 75 / 149 on this box, as of v2.1.308
Written about v2.1.101 first named in a changelog, 10 Apr 2026
v2.1.138 v2.1.308
In the changelogs
4
Releases whose published page names tengu_sedge_lantern.
v2.1.223 5 Aug 2026
v2.1.110 15 Apr 2026
v2.1.105 13 Apr 2026
v2.1.101 10 Apr 2026
Gate readings
1
Release Resolved This account Anonymous Compiled default
v2.1.223 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 .
First cited
3
The earliest release whose published evidence quoted tengu_sedge_lantern was v2.1.105 , 13 Apr 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
Release Date The span that was quoted
v2.1.110 15 Apr 2026 I8("tengu_sedge_lantern", !0) v2.1.110 15 Apr 2026 b8("tengu_sedge_lantern", !1)
Presence across releases
2
Builds How many Dates Reading
v2.1.138 – v2.1.222 75 builds 9 May 2026 → 4 Aug 2026 ◆ in the build
v2.1.223 – v2.1.308 74 builds 5 Aug 2026 → 22 Oct 2026 ○ not in the build
Build by build
149
One 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.
Build Date State The record behind it
v2.1.138 9 May 2026 · presentverdict: present · default bool:true v2.1.139 11 May 2026 · presentverdict: present · default bool:true v2.1.140 12 May 2026 · presentverdict: present · default bool:true v2.1.141 · presentverdict: present · default bool:true v2.1.142 · presentverdict: present · default bool:true v2.1.143 · presentverdict: present · default bool:true v2.1.144 · presentverdict: present · default bool:true v2.1.145 · presentverdict: present · default bool:true v2.1.146 · presentverdict: present · default bool:true v2.1.147 · presentverdict: present · default bool:true v2.1.148 · presentverdict: present · default bool:true v2.1.149 · presentverdict: present · default bool:true v2.1.150 · presentverdict: present · default bool:true v2.1.152 · presentverdict: present · default bool:true v2.1.153 · presentverdict: present · default bool:true v2.1.154 · presentverdict: present · default bool:true v2.1.156 · presentverdict: present · default bool:true v2.1.157 · presentverdict: present · default bool:true v2.1.158 · presentverdict: present · default bool:true v2.1.159 · presentverdict: present · default bool:true v2.1.160 · presentverdict: present · default bool:true v2.1.161 · presentverdict: present · default bool:true v2.1.162 · presentverdict: present · default bool:true v2.1.163 4 Jun 2026 · presentverdict: present · default bool:true v2.1.165 5 Jun 2026 · presentverdict: present · default bool:true v2.1.166 5 Jun 2026 · presentverdict: present · default bool:true v2.1.167 6 Jun 2026 · presentverdict: present · default bool:true v2.1.168 6 Jun 2026 · presentverdict: present · default bool:true v2.1.169 8 Jun 2026 · presentverdict: present · default bool:true v2.1.170 9 Jun 2026 · presentverdict: present · default bool:true v2.1.172 10 Jun 2026 · presentverdict: present · default bool:true v2.1.173 11 Jun 2026 · presentverdict: present · default bool:true v2.1.174 11 Jun 2026 · presentverdict: present · default bool:true v2.1.175 12 Jun 2026 · presentverdict: present · default bool:true v2.1.176 12 Jun 2026 · presentverdict: present · default bool:true v2.1.177 13 Jun 2026 · presentverdict: present · default bool:true v2.1.178 15 Jun 2026 · presentverdict: present · default bool:true v2.1.179 16 Jun 2026 · presentverdict: present · default bool:true v2.1.181 17 Jun 2026 · presentverdict: present · default bool:true v2.1.182 18 Jun 2026 · presentverdict: present · default bool:true v2.1.183 19 Jun 2026 · presentverdict: present · default bool:true v2.1.185 20 Jun 2026 · presentverdict: present · default bool:true v2.1.186 22 Jun 2026 · presentverdict: present · default bool:true v2.1.187 23 Jun 2026 · presentverdict: present · default bool:true v2.1.190 24 Jun 2026 · presentverdict: present · default bool:true v2.1.191 24 Jun 2026 · presentverdict: present · default bool:true v2.1.193 25 Jun 2026 · presentverdict: present · default bool:true v2.1.195 26 Jun 2026 · presentverdict: present · default bool:true v2.1.196 29 Jun 2026 · presentverdict: present · default bool:true v2.1.197 30 Jun 2026 · presentverdict: present · default bool:true v2.1.198 1 Jul 2026 · presentverdict: present · default bool:true v2.1.199 2 Jul 2026 · presentverdict: present · default bool:true v2.1.200 3 Jul 2026 · presentverdict: present · default bool:true v2.1.201 3 Jul 2026 · presentverdict: present · default bool:true v2.1.202 6 Jul 2026 · presentverdict: present · default bool:true v2.1.203 7 Jul 2026 · presentverdict: present · default bool:true v2.1.204 8 Jul 2026 · presentverdict: present · default bool:true v2.1.205 8 Jul 2026 · presentverdict: present · default bool:true v2.1.206 9 Jul 2026 · presentverdict: present · default bool:true v2.1.207 10 Jul 2026 · presentverdict: present · default bool:true v2.1.208 13 Jul 2026 · presentverdict: present · default bool:true v2.1.209 14 Jul 2026 · presentverdict: present · default bool:true v2.1.210 14 Jul 2026 · presentverdict: present · default bool:true v2.1.211 15 Jul 2026 · presentverdict: present · default bool:true v2.1.212 16 Jul 2026 · presentverdict: present · default bool:true v2.1.213 17 Jul 2026 · presentverdict: present · default bool:true v2.1.214 18 Jul 2026 · presentverdict: present · default bool:true v2.1.215 19 Jul 2026 · presentverdict: present · default bool:true v2.1.216 20 Jul 2026 · presentverdict: present · default bool:true v2.1.217 21 Jul 2026 · presentverdict: present · default bool:true v2.1.218 22 Jul 2026 · presentverdict: present · default bool:true v2.1.219 24 Jul 2026 · presentverdict: present · default bool:true v2.1.220 24 Jul 2026 · presentverdict: present · default bool:true v2.1.221 3 Aug 2026 · presentverdict: present · default bool:true v2.1.222 4 Aug 2026 · presentverdict: present · default bool:true v2.1.223 5 Aug 2026 · removedverdict: removed
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 .
