{"name":"tengu_concurrent_sessions","slug":"tengu-concurrent-sessions","family":"flag","title":"Feature flags","noun":"feature flag","description":"An analytics event, not a feature flag. Claude Code logs it at startup, after registering the session and counting the live sessions in its session registry, when that count is `2` or more; it carries `num_sessions`.","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":"2.1.309","builds":0,"mined_builds":150,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.75","anchor":"concurrent-session-detection","heading":"Concurrent Session Detection","line":null,"released_at":"2026-03-13 15:51:07","reason":"gate cited by this entry, found in this entry's text"}],"entries_total":1,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"tengu_concurrent_candle","slug":"tengu-concurrent-candle","description":"A new gated 'start kit' feature can auto-bundle an artifact type, design system, and REPL tool"},{"name":"tengu_concurrent_moonbeam","slug":"tengu-concurrent-moonbeam","description":"Behind a remote switch that falls back to off, turning off terminal titles can also skip automatic session titling"},{"name":"tengu_concurrent_onquery_detected","slug":"tengu-concurrent-onquery-detected","description":"An analytics event, not a feature flag. Claude Code logs it, with no fields, when a new query is submitted while another query is still running; the new query does not run, and its user prompts (other than some internal and notification messages) are put back on the input queue."},{"name":"tengu_concurrent_shore","slug":"tengu-concurrent-shore","description":"Waiting on a backgrounded shell command now keeps a task alive, controlled by a remote setting defaulting on."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-concurrent-sessions","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}