{"name":"tengu_bg_prewarm_burst_delay_ms","slug":"tengu-bg-prewarm-burst-delay-ms","family":"flag","title":"Feature flags","noun":"feature flag","description":"Default `15000` (milliseconds). How long the background-session supervisor waits, once it is ready, before its prewarm burst: restarting idle background sessions on a stale Claude Code version onto the running one, `tengu_bg_prewarm_burst_concurrency` (default `3`) at a time. The burst is skipped if the supervisor is shutting down, the concurrency is `0` or less, or `tengu_bg_attach_upgrade` is off.","description_source":"code","described_by":{"bundle":"2.1.286","author":"claude-opus-5-5"},"presence":{"first_seen":"2.1.206","removed_in":null,"in_current_build":true,"newest_mined":"2.1.308","builds":91,"mined_builds":149,"first_cited":null},"aliases":[],"entries":[],"entries_total":0,"docs":[],"docs_total":0,"gates":[{"version":"2.1.248","state":"unknown","account":null,"baseline":null,"code_default":null}],"related":[{"name":"tengu_bg_prewarm_burst_concurrency","slug":"tengu-bg-prewarm-burst-concurrency","description":"Background session prewarm now checks the concurrency limit instead of the delay value."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-bg-prewarm-burst-delay-ms","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}