{"version":"2.1.236","anchor":"one-shot-idle-subscriptions-deliver-exactly-one-notice-or-an","canonical_anchor":"one-shot-idle-subscriptions-deliver-exactly-one-notice-or-an","heading":"One-shot idle subscriptions deliver exactly one notice, or an expiry","tier":"internal","area":"Cross-Session Messaging","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.236\/e\/one-shot-idle-subscriptions-deliver-exactly-one-notice-or-an","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.236","markdown":"### One-shot idle subscriptions deliver exactly one notice, or an expiry\n\nAn idle subscription to another session delivers one notice or an expiry, and older peers are refused.\n\n**What**\n\nA subscription to another session's idle state results in a single `[Cross-session idle notice]` message, or a notice that the subscription expired. Peers running an older version are reported as unsupported and nothing is subscribed.\n\n**Details**\n\n- The local socket channel gained request and notice frame types, correlated back to the original message id.\n- Self-targets and out-of-reach namespaces are vetted and refused.\n- Analytics under `cross_session_notify_idle` cover own_inbox_unbound, unvettable_reply_target, self_target_frame, malformed_frame and malformed_notice.\n- Session records advertise their supported peer features so version mismatches are detected before subscribing.\n- The parameter is only present in the cross-session-messaging build of the tool.\n\n**Evidence**\n\n`notify_when_idle: that session runs a version without idle notices \\u2014 nothing was subscribed.`\n\n- Area: Cross-Session Messaging\n- Tier: Under the hood\n- Useful: 2\/5\n- Signal: 2\/5"}