Definition
Any failure, warning, or human-intervention condition raised during an agent-led checkout after the basket and purchase intent are already established, modeled at the business-logic level rather than as generic HTTP failure.
StoreSteady treats agentic checkout exception as a reference term because Non-standard error signaling: The merchant returns opaque or HTML-only errors that prevent automated classification.
Why it matters
- Non-standard error signaling changes what a crawler, shopping channel, or AI assistant can safely infer about the merchant surface.
- Without a named category, operators tend to treat agentic checkout exception as generic AI noise instead of a reproducible finding with evidence and a validation path.
Evidence sources
- out-of-stock at confirm time, missing buyer information, invalid address, eligibility failures, discount/promotion restrictions, payment declines, fraud holds, regulatory holds, human-review requirements.
How StoreSteady detects it
Instrument the message array, business-error codes, and recoverability classes from checkout responses. Replay agent checkout against representative scenarios (out-of-stock, address invalid, eligibility fail, payment decline, fraud block). Measure completion-step dropoff and classify by failure type.
False positive risks
- A 500 error from the merchant's CDN - that's a protocol/server error, not a business-logic checkout exception.
- A user closing the browser tab - that's abandonment, not an exception.
How to fix it
- Identify the merchant-controlled source that creates the agentic checkout exception signal.
- Reconcile visible copy, machine-readable data, policy text, feed state, and checkout behavior where the term applies.
- Keep the fix high-level in public docs; detailed remediation belongs inside paid scan workflows.
How to validate it
Rerun the same evidence capture used for detection. The finding is validated only when the original agentic checkout exception signal no longer reproduces and adjacent source surfaces still agree.
Example finding
Non-standard error signaling
Observed: An agent confirms a cart and the merchant returns a UCP business-logic error: `out_of_stock` with `recoverable: true` and an alternate-variant suggestion. The agent can autonomously substitute the alternate variant.
Likely impact: Non-standard error signaling: The merchant returns opaque or HTML-only errors that prevent automated classification.
Probable fix location: Checkout or cart flow
Related StoreSteady issue codes
| Code | Title | Scanner mapping |
|---|---|---|
| CHK-001 | Recoverable stock or address block | Planned detector |
| CHK-002 | Buyer-input-required exception | Planned detector |
| CHK-003 | Buyer-review-required exception | merchant_pending_policy_review |
| CHK-004 | Payment or fraud block | Planned detector |
| CHK-005 | Non-standard error signaling | landing_page_error, image_link_internal_error |
Related standards
See also
Sources
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