{"name":"tengu_silent_harbor","slug":"tengu-silent-harbor","family":"flag","title":"Feature flags","noun":"feature flag","description":"Claude Code labels and groups each part of its system prompt, and a new detached mode skips a setup step; the prompt text is the same","description_source":"entry","described_by":{"version":"2.1.286","anchor":"system-prompt-sections-are-now-tagged-and-grouped-detached"},"presence":{"first_seen":"2.1.176","removed_in":null,"in_current_build":true,"newest_mined":"2.1.309","builds":116,"mined_builds":150,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.301","anchor":"system-prompt-gains-a-variant-mode-with-surface-section-and","heading":"System prompt gains an alternate layout that is not yet in use","line":"Claude Code's system prompt can now be built in an alternate layout with extra sections, but the prompt sent in ordinary use is unchanged","released_at":"2026-10-15 14:34:23","reason":"gate cited by this entry"},{"version":"2.1.286","anchor":"system-prompt-sections-are-now-tagged-and-grouped-detached","heading":"System prompt parts are now labelled; detached sessions skip some setup","line":"Claude Code labels and groups each part of its system prompt, and a new detached mode skips a setup step; the prompt text is the same","released_at":"2026-09-30 17:14:38","reason":"gate cited by this entry"}],"entries_total":2,"docs":[],"docs_total":0,"gates":[{"version":"2.1.301","state":"off","account":false,"baseline":false,"code_default":false},{"version":"2.1.286","state":"off","account":false,"baseline":false,"code_default":false}],"related":[{"name":"tengu_silent_heron","slug":"tengu-silent-heron","description":"When a background shell command produces no new output for a while, Claude is sent a check-in note, if a server sets the waiting time"}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-silent-harbor","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}