The agents finished every task. Nobody got what they were promised.
That gap is where most AI agent demos quietly live.
A demo shows a workflow running end to end. Clean handoffs, fast output, impressive. Then someone in the room treats that as evidence the service can be delivered. It isn't. Task completion is an internal event. Delivery is something a buyer experiences — and those are different claims with different evidence behind them.
Two things follow, and both cost money.
First, the costing. Generation is the cheap part. The real number includes human review, the supplier exceptions nobody scripted, and the follow-through when reality doesn't match the happy path. If that work sits outside your cost model, you haven't costed the service. You've costed the demo.
Second, the proof. The test isn't the agents' activity log. It's participant and buyer response measured against the experience you promised. Which means you need to agree, before you buy, what a completed result looks like — something the buyer can check without a three-week argument about attribution.
Do that upfront and the demo becomes useful. Skip it and you've bought a very convincing video.
What would your buyer accept as proof it was actually delivered?
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