tengu_daemon_upgrade_respawn_unreachable
A Claude Code feature flag, read out of the shipped bundle.
It was in the build from v2.1.203 and was gone by v2.1.242.
An analytics event, not a feature flag. Claude Code logs it when the daemon detects an upgrade and re-spawns itself, and the successor process spawns but does not become reachable in time. The field stderr_captured says whether any of the successor's stderr was captured.
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.241 bundle, and it can be wrong.
First seen v2.1.203 7 Jul 2026
Last seen v2.1.241 22 Aug 2026, gone by v2.1.242
Builds38 / 150on this box, as of v2.1.309
Written about — no changelog entry names it
v2.1.203in the build not in the build never minedv2.1.309
In the changelogs
0
No changelog entry here has ever named it. That is a statement about what has been written, not about the name: it has been in the build since v2.1.203 without anybody writing a line about it.
Gate readings
0
No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.
First cited
0
No 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
2
BuildsHow manyDatesReading
v2.1.203 – v2.1.24138 builds7 Jul 2026 → 22 Aug 2026 ◆in the build
v2.1.242 – v2.1.30957 builds24 Aug 2026 → 22 Oct 2026 ○not in the build
Build by build
95
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.
BuildDateStateThe record behind it
v2.1.2037 Jul 2026·addedverdict: added · default object
v2.1.2048 Jul 2026·presentverdict: present · default object
v2.1.2058 Jul 2026·presentverdict: present · default object
v2.1.2069 Jul 2026·presentverdict: present · default object
v2.1.20710 Jul 2026·presentverdict: present · default object
v2.1.20813 Jul 2026·presentverdict: present · default object
v2.1.20914 Jul 2026·presentverdict: present · default object
v2.1.21014 Jul 2026·presentverdict: present · default object
v2.1.21115 Jul 2026·presentverdict: present · default object
v2.1.21216 Jul 2026·presentverdict: present · default object
v2.1.21317 Jul 2026·presentverdict: present · default object
v2.1.21418 Jul 2026·presentverdict: present · default object
v2.1.21519 Jul 2026·presentverdict: present · default object
v2.1.21620 Jul 2026·presentverdict: present · default object
v2.1.21721 Jul 2026·presentverdict: present · default object
v2.1.21822 Jul 2026·presentverdict: present · default object
v2.1.21924 Jul 2026·presentverdict: present · default object
v2.1.22024 Jul 2026·presentverdict: present · default object
v2.1.2213 Aug 2026·presentverdict: present · default object
v2.1.2224 Aug 2026·presentverdict: present · default object
v2.1.2235 Aug 2026·presentverdict: present · default object
v2.1.2247 Aug 2026·presentverdict: present · default object
v2.1.2257 Aug 2026·presentverdict: present · default object
v2.1.2268 Aug 2026·presentverdict: present · default object
v2.1.22710 Aug 2026·presentverdict: present · default object
v2.1.22811 Aug 2026·presentverdict: present · default object
v2.1.22912 Aug 2026·presentverdict: present · default object
v2.1.23113 Aug 2026·presentverdict: present · default object
v2.1.23213 Aug 2026·presentverdict: present · default object
v2.1.23314 Aug 2026·presentverdict: present · default object
v2.1.23417 Aug 2026·presentverdict: present · default object
v2.1.23518 Aug 2026·presentverdict: present · default object
v2.1.23619 Aug 2026·presentverdict: present · default object
v2.1.23719 Aug 2026·presentverdict: present · default object
v2.1.23820 Aug 2026·presentverdict: present · default object
v2.1.23921 Aug 2026·presentverdict: present · default object
v2.1.24022 Aug 2026·presentverdict: present · default object
v2.1.24122 Aug 2026·presentverdict: present · default object
v2.1.24224 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.
