{"version":"2.1.292","anchor":"smaller-prop-and-schema-additions","canonical_anchor":"smaller-prop-and-schema-additions","heading":"Several small internal fields and a new subagent start-failure message","tier":"internal","area":"Subagents","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.292\/e\/smaller-prop-and-schema-additions","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.292","markdown":"### Several small internal fields and a new subagent start-failure message\n\nClaude Code adds a handful of internal fields and a new message for when a subagent fails to start after hooks allowed it\n\n**What**\n\nSeveral small internal fields were added, covering workflows, message batches, proactivity state and query tracking. None of them changes anything you can see yet.\n\nA new error message also appears for when a subagent (a helper agent Claude starts to handle part of a task) did not start even though the hooks (your own scripts that run at set points) let it through: \"the subagent did not start after the hooks passed it on\".\n\n**Why**\n\nThese look like preparation for features that are not visible yet. The start-failure message is the one piece you might actually meet.\n\n- Area: Subagents\n- Tier: Under the hood\n- Useful: 2\/5\n- Signal: 3\/5\n- Scope: individual\n- Heads-up: no"}