Method snapshotItems

pkg/session/session.go:438–449

snapshotItems returns a copy of s.Messages safe to use without holding s.mu. Each Message value is deep-copied so concurrent UpdateMessage calls cannot mutate the snapshot; non-Message fields (Summary, SubSession, Cost, FirstKeptEntry) are shallow-copied since they are not mutated in place.

()

// cannot mutate the snapshot; non-Message fields (Summary, SubSession, Cost,
// FirstKeptEntry) are shallow-copied since they are not mutated in place.
func (s *Session) snapshotItems() []Item {
	s.mu.RLock()
	defer s.mu.RUnlock()
	items := make([]Item, len(s.Messages))
	for i, item := range s.Messages {
		items[i] = item
		if item.Message != nil {
			items[i].Message = cloneMessage(item.Message)
		}
	}
	return items
}

// cloneChatMessage returns a deep copy of a chat.Message, duplicating
// all slice and pointer fields that would otherwise alias the original.