JacobiusMakes/agent-shoppable-census

Agent-Shoppable Census

Can an AI agent buy a ring here?

This is a reproducible census of 100 US online sellers of engagement rings and diamond jewelry. It tests public agent-readiness signals and separates them into two tiers so that default ecommerce-platform features do not inflate the result.

The September 2026 snapshot reports 18 Tier A sellers with merchant-built agent signals, 52 Tier B sellers with platform-inherited signals, and 30 sellers that were unreachable to the read-only probe. These labels describe the public technical surface observed on the run date. They do not grade business quality.

Published by Stienhardt & Stones, a New York City lab-grown diamond and engagement ring retailer. Stienhardt is one of the 100 rows, is identified as the publisher, and is scored by the same script and rubric as every other seller.

Configurations

• summary: one row per seller with observed agent-readiness, ecommerce, structured-data, crawler, and endpoint fields.
• domains: the 100-domain sampling frame, seller name, source code, and notes.

Reproducibility and raw evidence

The GitHub repository contains the read-only probe, results renderer, full methodology, raw HTTP evidence, run metadata, cited domain-source table, known limits, and licenses.

The fixed v0.2 release packages the September domain list, summary, raw evidence, run metadata, and rendered results. GitHub publishes a SHA-256 digest for every release asset.

Tier summary

• Tier A, merchant-built: at least one seller-controlled agent signal, such as a qualifying MCP Registry entry, a live custom MCP endpoint, substantive agents.md or llms.txt, an ACP endpoint, or a merchant-hosted UCP profile.
• Tier B, platform-inherited: signals supplied by a platform or theme, such as Shopify-hosted UCP, template-generated agent files, or Product and Offer JSON-LD.
• Unreachable: neither tier was observed by the read-only probe. The repository records bot walls, HTTP failures, and connection failures separately.

Important limits

• This is a dated web census. Public endpoints can change after the run.
• One product page is sampled per seller.
• A blocked fetch does not prove the seller has no agent infrastructure.
• The list is a documented public-source approximation, not a precise ranking by ecommerce revenue.

License

The summary tables, domain list, and prose are CC BY 4.0. Probe and rendering code in the GitHub repository are MIT licensed. See the repository for the complete license boundaries and third-party cache exclusions.

Citation

@dataset{stienhardt_agent_shoppable_census_2026,
  title  = {Agent-Shoppable Census: agent readiness among 100 US online jewelry sellers},
  author = {{Stienhardt & Stones}},
  year   = {2026},
  month  = {9},
  url    = {https://github.com/JacobiusMakes/agent-shoppable-census},
  note   = {Version 0.2, CC BY 4.0}
}