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Source essay: 2acrestudios.com/insights/the-harness-is-where-value-lives/
Buyer-side assessment · For operators signing AI checks
Before you write the check. The harness is where the value lives — and most vendors can't answer all eight.
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Why this matters
Not on the model. On what wasn't built around the model — the workflow, the guard rails, the decision log, the rollback path, the ownership after launch.
That's the harness. Most vendors sell the model. The harness is where the money actually goes.
Question 01 · Workflow
Walk me through the specific business workflow this agent operates inside, step by step. Which steps are the model's, which stay with my team, and what does "done" look like at the end?
Question 02 · Guard rails
What automated checks run before this agent takes an action, and what runs after? When the agent encounters something outside its training, how do I learn about it — loudly, or never?
Question 03 · Verification
Before this agent makes a change to my data, what verification has it run on its own output? What confidence threshold makes it escalate to a human?
Question 04 · Memory
Show me where the agent stores knowledge about my business specifically — not the model's training data, mine. How is that storage queryable? How does old context decay?
Question 05 · Decision log
Walk me through a single past decision the system made, end to end — the input, the output, the reasoning trace, the timestamp. If a regulator asks "why did the agent do this in November?", what do I show them?
Question 06 · Rollback
What happens when the agent makes a wrong call that has already touched my data, my customer's inbox, or my GL? Specifically what is reversible? What command undoes it?
Questions 07 + 08 · Review & ownership
07 · Does the agent that proposes the action also approve it, or is there a separate review path?
08 · Twelve months in — when your company has pivoted or the model has been upgraded — who at my company knows how to keep this system tuned?
If your vendor can't answer all 8
Bring this list to the next AI vendor conversation. The ones with good answers will get sharper. The ones without will start hedging within three minutes.