{"version":"2.1.259","anchor":"block-new-subagent-spawns-while-an-agents-stop-is-still-com","canonical_anchor":"block-new-subagent-spawns-while-an-agents-stop-is-still-com","heading":"Block new subagent spawns while an agent's stop is still completing","tier":"notice","area":"Subagents","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.259\/e\/block-new-subagent-spawns-while-an-agents-stop-is-still-com","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.259","markdown":"### Block new subagent spawns while an agent's stop is still completing\n\nLaunching a subagent, skill fork or monitor is now refused while the invoking agent's stop is still completing.\n\nSubagent, skill, and monitor launches now check a `stopPendingAgentIds` registry before starting. If the invoking agent's stop is still completing, launching a new subagent, skill fork, or background monitor is refused with an explicit error instead of racing the in-flight stop.\n\n- Area: Subagents\n- Tier: You'll notice\n- Useful: 2\/5\n- Signal: 2\/5"}