{"name":"tengu_mid_conv_system_fallback_retry","slug":"tengu-mid-conv-system-fallback-retry","family":"flag","title":"Feature flags","noun":"feature flag","description":"An analytics event, not a feature flag. Claude Code logs it when the API rejects a request carrying mid-conversation `role:\"system\"` messages or per-turn statements and Claude Code retries without them; the fields are `per_turn_effort`, `misplaced`, and, when a misplaced system message was found, `misplaced_index`, `wire_message_count` and `message_count`.","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":null},"aliases":[],"entries":[{"version":"2.1.201","anchor":"claude-sonnet-5-added-to-model-compatibility-list","heading":"claude-sonnet-5 added to model compatibility list","line":null,"released_at":"2026-07-03 20:52:33","reason":"gate cited by this entry, found in this entry's text"}],"entries_total":1,"docs":[],"docs_total":0,"gates":[],"related":[],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-mid-conv-system-fallback-retry","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}