Developer builds self-validating UCP conformance checker that must prove it can fail

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A developer has released an open-source conformance checker for the Universal Commerce Protocol (UCP), a standard enabling AI agents to discover products and process checkouts with merchants. The tool enforces a strict rule: no check is released until it has been proven to catch its own injected defect, preventing false-positive results that could give users misleading confidence. Each check references official UCP schema validators and specific normative spec clauses, making results traceable rather than reliant on the author's interpretation. Testing against real implementations revealed apparent structural mismatches between the official Node.js reference sample and the 2026 profile schema, which the developer has flagged upstream for clarification. The tool is available via pip, a GitHub Actions integration, and a no-install web interface at spck.dev/check.

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