{"name":"tengu_client_data_cache_key","slug":"tengu-client-data-cache-key","family":"flag","title":"Feature flags","noun":"feature flag","description":"An analytics event, not a feature flag. Claude Code logs it while refreshing its cached account client data, with booleans `slot_hit` (a cache slot exists for the current account key), `slot_changed`, `legacy_fallback` (no slot but the older single `clientDataCache` exists) and `slot_stale`.","description_source":"code","described_by":{"bundle":"2.1.286","author":"claude-opus-5-5"},"presence":{"first_seen":null,"removed_in":null,"in_current_build":false,"newest_mined":"2.1.308","builds":0,"mined_builds":149,"first_cited":{"version":"2.1.187","released_at":"2026-06-23 17:55:41","spans":1}},"aliases":[],"entries":[{"version":"2.1.187","anchor":"per-context-bootstrap-data-cache-in-development","heading":"Per-context bootstrap data cache [In Development]","line":null,"released_at":"2026-06-23 17:55:41","reason":"gate cited by this entry, found in this entry's text"}],"entries_total":1,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"tengu_client_data_stale_refetch","slug":"tengu-client-data-stale-refetch","description":"Claude can refetch startup config when the server says it is stale, but the gate is off."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-client-data-cache-key","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}