diff --git a/docs/design/hook-system-design.zh.md b/docs/design/hook-system-design.zh.md
index b654112bf..090437c20 100644
--- a/docs/design/hook-system-design.zh.md
+++ b/docs/design/hook-system-design.zh.md
@@ -455,7 +455,7 @@ V1 不做复杂自动发现。
 ### Phase 3
 
 - 把 `SubagentManager` 迁移到 `runTurn/sub-turn`
-- 接通 `subturn_spawn` / `subturn_end` / `subturn_result_delivered`
+- 接通 `agent.subturn.spawn` / `agent.subturn.end` / `agent.subturn.result_delivered`
 
 ### Phase 4
 
diff --git a/pkg/agent/subturn.go b/pkg/agent/subturn.go
index 62ea0e7e7..483c72842 100644
--- a/pkg/agent/subturn.go
+++ b/pkg/agent/subturn.go
@@ -505,16 +505,16 @@ func spawnSubTurn(
 //
 // Delivery behavior:
 //   - If parent turn is still running: attempts to deliver to pendingResults channel
-//   - If channel is full: emits SubTurnOrphanResultEvent (result is lost from channel but tracked)
-//   - If parent turn has finished: emits SubTurnOrphanResultEvent (late arrival)
+//   - If channel is full: emits agent.subturn.orphan (result is lost from channel but tracked)
+//   - If parent turn has finished: emits agent.subturn.orphan (late arrival)
 //
 // Thread safety:
 //   - Reads parent state under lock, then releases lock before channel send
 //   - Small race window exists but is acceptable (worst case: result becomes orphan)
 //
 // Event emissions:
-//   - SubTurnResultDeliveredEvent: successful delivery to channel
-//   - SubTurnOrphanResultEvent: delivery failed (parent finished or channel full)
+//   - agent.subturn.result_delivered: successful delivery to channel
+//   - agent.subturn.orphan: delivery failed (parent finished or channel full)
 func deliverSubTurnResult(al *AgentLoop, parentTS *turnState, childID string, result *tools.ToolResult) {
 	// Let GC clean up the pendingResults channel; parent Finish will no longer close it.
 	// We use defer/recover to catch any unlikely channel panics if it were ever closed.
diff --git a/pkg/agent/subturn_test.go b/pkg/agent/subturn_test.go
index ac4184e7e..6a33892db 100644
--- a/pkg/agent/subturn_test.go
+++ b/pkg/agent/subturn_test.go
@@ -326,7 +326,7 @@ func TestSpawnSubTurn_OrphanResultRouting(t *testing.T) {
 	time.Sleep(10 * time.Millisecond) // let event goroutine flush
 	// Verify Orphan event is emitted
 	if !collector.hasEventOfKind(runtimeevents.KindAgentSubTurnOrphan) {
-		t.Error("SubTurnOrphanResultEvent not emitted for finished parent")
+		t.Error("agent.subturn.orphan not emitted for finished parent")
 	}
 
 	// Verify history is NOT polluted