{"name":"tengu_swift_whistle","slug":"tengu-swift-whistle","family":"flag","title":"Feature flags","noun":"feature flag","description":"Subagent report truncation accounting for a 'harness tail' section stays inert behind a flag.","description_source":"entry","described_by":{"version":"2.1.261","anchor":"subagent-harness-tail-size-accounting-behind-tengu-swift-w"},"presence":{"first_seen":"2.1.261","removed_in":null,"in_current_build":true,"newest_mined":"2.1.322","builds":55,"mined_builds":161,"first_cited":{"version":"2.1.261","released_at":"2026-09-04 17:49:34","spans":2}},"aliases":[],"entries":[{"version":"2.1.261","anchor":"subagent-harness-tail-size-accounting-behind-tengu-swift-w","heading":"Subagent \"harness tail\" size accounting behind tengu_swift_whistle","line":"Subagent report truncation accounting for a 'harness tail' section stays inert behind a flag.","released_at":"2026-09-04 17:49:34","reason":"found in this entry's text, named in this entry, gate cited by this entry"},{"version":"2.1.261","anchor":"new-gate-tengu-swift-whistle","heading":"New gate: tengu_swift_whistle","line":"A new feature gate was added, defaulting to false.","released_at":"2026-09-04 17:49:34","reason":"found in this entry's text, named in this entry, gate cited by this entry"}],"entries_total":2,"docs":[],"docs_total":0,"gates":[{"version":"2.1.261","state":"unknown","account":null,"baseline":null,"code_default":false}],"related":[{"name":"tengu_swift_bear","slug":"tengu-swift-bear","description":"Claude Code now handles stops that no person made separately, and a new `spare_background_tasks` request field shields background tasks from a stop"},{"name":"tengu_swift_garden","slug":"tengu-swift-garden","description":"Default `true`. When on, opening the `\/model` picker can start an entitlement probe for the Fable model (a forced server-side validation of the model, at most `2` attempts, with the picker waiting up to `15000` ms for it), subject to further conditions such as the first-party API provider. The result is recorded as `accepted` or `refused`. `false` skips the probe."},{"name":"tengu_swift_lynx","slug":"tengu-swift-lynx","description":"A hidden new tool lets Claude open the page for a startup promotional offer"},{"name":"tengu_swift_pelican","slug":"tengu-swift-pelican","description":"A new check allows an item through a built-in test, or for Anthropic API users when it appears on a list the server sends"}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-swift-whistle","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}