Security tools that respond to threats on their own instead of waiting on an analyst.
The cost of a security operations team is analyst time. Most of that time is spent doing work a machine should do: pulling context onto an alert, deciding which of two hundred procedures applies, writing the same containment steps for the tenth time this quarter.
Automating that changes the economics twice. The obvious saving is headcount, because a five-person team can carry what previously kept a larger one busy. The less obvious one is consistency: automated response does the same thing every time, on the incident where nobody senior is awake yet.
The alternative most teams are offered is an enterprise SOAR contract sized and priced for a large organisation, followed by a six-month integration project billed on top. The work of building the automations is the part that actually costs money. It is also the part that usually does not get finished.
The bottleneck is analyst attention. The runbook is the product. If your team is drowning in alerts that each need the same context assembled by hand, this is the layer that removes the assembling.