{"name":"tengu_larch_cistern","slug":"tengu-larch-cistern","family":"flag","title":"Feature flags","noun":"feature flag","description":"Default `false`. When on, the system prompt gets an `overcorrection` section headed `# Corrections`, telling the model to avoid unnecessary self-correction, to correct an earlier statement only when the error would change the user's code, conclusions or decisions, and not to treat a follow-up question as a sign it was wrong. The section is also added when `CLAUDE_CODE_LARCH_CISTERN` is set, when the Opus 5 prompt bundle applies (unless `tengu_fennel_godwit` is on), or when the client data key of this name is `true`.","description_source":"code","described_by":{"bundle":"2.1.259","author":"claude-opus-5-5"},"presence":{"first_seen":"2.1.257","removed_in":"2.1.260","in_current_build":false,"newest_mined":"2.1.308","builds":3,"mined_builds":149,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.217","anchor":"four-new-unnamed-feature-flags-in-development","heading":"Four New Unnamed Feature Flags [In Development]","line":null,"released_at":"2026-07-21 19:55:38","reason":"gate cited by this entry, found in this entry's text"}],"entries_total":1,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"tengu_larch_pavise","slug":"tengu-larch-pavise","description":"A per-session workshop document gets snapshotted with your session files and is only writable in plan mode."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-larch-cistern","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}