Costco passed the agent’s check: 4 out of 4, every fact from costco.com.
Four journeys, four recommendations for the Gold Star membership, every decisive fact read on Costco’s own pages in six to nine page reads.
Named-offer check Four runs · named-offer check · one research-agent configuration · no purchase made · 2026-09-20 · all 4 journeys of this decision
Four recorded research runs on whether a Gold Star membership fits a Denver household. All four recommended it, in six to nine page reads, with every decisive fact quoted from costco.com or customerservice.costco.com. The customers who remembered an unused membership and a surprise renewal asked the refund question first and found the answer on the same pages.
- The customer’s requirements
- Annual fee at most $70; fee refundable in full on cancellation; most items returnable for at least 60 days; electronics for at least 60 days as a preference.
- The information used
- $65 a year; ‘we will refund your membership fee in full at any time if you are dissatisfied’; no stated time limit on most returns under the satisfaction guarantee; 90 days on electronics.
- The resulting recommendation
- Gold Star membership, four runs out of four, with and without memory.
The full evidence, every option weighed and every source, follows below and on each journey page.
The customer
A two-adult household in Denver spending about $3,000 a year on groceries and household goods, deciding whether a Gold Star membership is worth it for the coming year. Typed conditions: fee at most $70, refundable in full on cancellation, most items returnable for at least 60 days, electronics for at least 60 as a preference. Two of the four customers remembered paying for a warehouse membership they used four times and could not get refunded, and an automatic renewal they had meant to cancel.
What the agent researched
costco.com and customerservice.costco.com, and nothing else. Six to nine page reads per journey. No comparison site, no forum, no search-engine summary.
- 1Customer missionCostco decision — customer with no relevant memory
- annual membership fee at most 70 USD
- membership fee fully refundable on cancellation
- most items returnable for at least 60 days
- electronics returnable for at least 60 days (preference)
- 2Evidence3 searches, 6 pages: costco.com, customerservice.costco.com
- membership fee usd: 65 brand page
- membership refundable: Yes — Costco states it will cancel and refund the membership fee in full at any brand page
- return window days: No stated time limit for most merchandise under the Risk-Free 100% Satisfaction brand page
- electronics return window days: 90 brand page
- 3BeliefRequirements met on the evidence found
- 4DecisionSelectedCostco Gold Star MembershipAll four required/preferred facts were established directly on Costco's own domains (costco.com and customerservice.costco.com). The Gold Star annual fee is $65, which me…
What it believed
$65 a year. 'We will refund your membership fee in full at any time if you are dissatisfied.' No stated time limit on returns for most merchandise under the satisfaction guarantee, and 90 days on electronics. Every one of these was quoted from a Costco page, and every one is what Costco publishes.
The decision
What the agent assessed was whether the four typed membership conditions held: the fee, the refund rule and the return windows. It did not compute the household’s savings from a $3,000 grocery spend, and the record should not be read as a measured value calculation.
Gold Star membership, four times out of four. The sceptical customers, the ones who remembered the unused membership and the surprise renewal, chose it as readily as the fresh ones, because the refund rule was in the company's own words on the first page they read.
- 1Customer missionCostco decision — same customer with relevant memory
- annual fee at most $70
- membership fee refundable in full on cancellation
- general return window at least 60 days for most items
- electronics return window at least 60 days (preference)
- 2Evidence4 searches, 6 pages: costco.com, customerservice.costco.com
- membership fee usd: 65 brand page
- membership refundable: Yes — 'We will refund your membership fee in full at any time if you are dissati brand page
- return window days: No specific day limit stated for most merchandise (open-ended 'Risk-Free 100% Sa brand page
- electronics return window days: 90 brand page
- 3BeliefRequirements met on the evidence found
- 4DecisionSelectedCostco Gold Star MembershipAll four requirement facts were established directly from Costco's own domains (costco.com and customerservice.costco.com). The Gold Star annual fee is $65, which is at o…
What was never established
One thing the agent had to reason about rather than read: Costco does not state a day count for most returns, it states a guarantee. The agent recorded that honestly as 'no stated limit' and judged it against the 60-day condition as met. A stricter reader might have called it unresolved.
Fresh versus persistent memory
No difference. The memory customers asked the refund question first and found the answer first. In these runs, the remembered concern was answered by the first page the agent read; whether that holds beyond four runs is not established.
What this means for the brand
In these four runs the agent reached the site, read the conditions in Costco’s words, and stopped looking. Costco spent nothing on this decision that it had not already spent on writing its policies down.
What would change the decision
A fee above $70, a refund rule that was not on the page, or a site that answered the agent with a CAPTCHA. Two of the six brands in this batch failed on the third.
What could be tested
Whether the result holds when a condition is missing from the page: the same customer and requirements with the refund rule withheld from the readable surface. That comparison would show whether the page, or the brand, did the work here.
Accord connects the customer’s requirements, Costco’s published conditions and this journey evidence into one case, then tests which change, if any, matters.
Limits
- Four journeys, one agent configuration.
- The household's spend and thresholds are synthetic; Costco's conditions are real, read on 20 September 2026.
- Every journey run with Claude on the live web. Every source, belief and decision published.
Reproduce this experiment → the frozen customer mission, ready to run in your own agent.
Investigated with Accord. Accord is the decision-intelligence system behind these experiments. It reconstructs how customer agents evaluate services, identifies what remains unresolved, and tests what changes when the enterprise provides better information or a more authoritative answer. For brands and CX teams →