tengu_zinc_harbor

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.275, including the newest one read.

Releases whose published page names tengu_zinc_harbor.

1. v2.1.275 17 Sep 2026
   Orphaned backgrounded tasks get auto-aborted and quietly parked

   Background tasks left running after their owning agent disappears are now automatically stopped

   gate cited by this entry

2. v2.1.275 17 Sep 2026
   In-process teammate polling gets an idle timeout, behind tengu_zinc_harbor

   In-process teammate polling can time out after a period of inactivity, gated off for now

   gate cited by this entry, found in this entry's text

3. v2.1.275 17 Sep 2026
   Async subagent stall watchdog can now "park" instead of aborting

   Background subagents that stall can now be 'parked' with a synthesized result instead of always erroring out

   gate cited by this entry, found in this entry's text

4. v2.1.275 17 Sep 2026
   Interrupted background agents/tasks can be 'parked' and resumed instead of just stopped

   Interrupting a background agent now 'parks' it for resuming instead of stopping it outright

   gate cited by this entry

5. v2.1.275 17 Sep 2026
   New tengu gates: tengu_typed_koala, tengu_zinc_harbor, tengu_tranquil_crescent

   Claude Code adds three new internal feature gates: typed_koala, zinc_harbor, tranquil_crescent

   gate cited by this entry, found in this entry's text

6. v2.1.275 17 Sep 2026
   Alternate background-agent-stop path behind tengu_zinc_harbor flag

   A new alternate way to stop background agents on cancel exists behind an unreleased flag

   gate cited by this entry, found in this entry's text

7. v2.1.275 17 Sep 2026
   Auto-naming for unnamed background subagents behind tengu_zinc_harbor

   Unnamed background subagents can now get an automatic display name

   gate cited by this entry, found in this entry's text

8. v2.1.275 17 Sep 2026
   Async-agent 'park' fallback behind tengu_zinc_harbor

   Stalled background subagents can now be 'parked' with a partial result instead of aborted, behind an off flag

   gate cited by this entry, found in this entry's text

9. v2.1.275 17 Sep 2026
   Background-agent "park on Escape" path gated behind tengu_zinc_harbor, off by default

   Escape can now 'park' running background agents instead of just ignoring them, gated behind tengu_zinc_harbor

   gate cited by this entry, found in this entry's text

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.

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.

The earliest release whose published evidence quoted tengu_zinc_harbor was v2.1.275, 17 Sep 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.

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.

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.