{"name":"tengu_bg_spare_enable","slug":"tengu-bg-spare-enable","family":"flag","title":"Feature flags","noun":"feature flag","description":"Default `true`. Lets the background-session dispatcher keep a warm spare worker process started ahead of time (not on Windows) and hand it to the next dispatched session whose launch mode is not `exec`, provided the spare was started by the same Claude Code version. Turning it off disposes any existing spare and stops spares from being started or claimed.","description_source":"code","described_by":{"bundle":"2.1.286","author":"claude-opus-5-5"},"presence":{"first_seen":"2.1.138","removed_in":null,"in_current_build":true,"newest_mined":"2.1.308","builds":149,"mined_builds":149,"first_cited":null},"aliases":[],"entries":[],"entries_total":0,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"tengu_bg_spare_claim_fail","slug":"tengu-bg-spare-claim-fail","description":"Background session records can be flagged as spare, but nothing in this build decides when a spare gets spawned."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-bg-spare-enable","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}