{"version":"2.1.292","anchor":"background-task-completion-adds-handback-fields","canonical_anchor":"background-task-completion-adds-handback-fields","heading":"SDK task notifications can carry a subagent's handback report","tier":"internal","area":"SDK","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.292\/e\/background-task-completion-adds-handback-fields","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.292","markdown":"### SDK task notifications can carry a subagent's handback report\n\nThe SDK's background-task notification has two new optional fields, `handback` and `handback_report`, for subagent reports\n\n**What**\n\nThe SDK is the kit that lets other apps drive Claude Code. When a background task finishes, it sends a notification. That notification can now carry two optional fields, `handback` and `handback_report`. They are used for subagents (helper agents Claude starts for part of a task) that report back through the SubagentHandback tool. Both fields are marked as internal.\n\n**Why**\n\nApps built on the SDK can use these fields to show a subagent's report when its task completes.\n\n- Area: SDK\n- Tier: Under the hood\n- Useful: 3\/5\n- Signal: 4\/5\n- Scope: individual\n- Heads-up: no"}