ARC snapshot 2026-10-30

README.md

@@ -88,7 +88,7 @@ Counted from `store_answers.csv` in snapshot 2026-10-30. `market` is United Stat
 | `ucp` | Honest machine value for the /.well-known/ucp profile, on snapshots that include the column. not_found_at_host means: No public UCP profile found at the host. The store may still offer agent checkout through Google's UCP via Merchant Center. ARC has no access to Merchant Center data. turned_away means the HTTP status was not recorded. turned_away_challenge means a challenge page when the status is known. turned_away_block means HTTP 403. The short label is Turned away ARC's automated check. The HTTP 403 sentence is for the API and detail views. valid, invalid, and error are the other finished readings. not_tested means the check did not finish. The published latest store_answers file does not have this column. |
 | `publishes_ucp_file` | Does the store publish a UCP file at /.well-known/ucp? The cell comes only from the file check. yes means HTTP 200 JSON with a version plus services or capabilities. not_found_at_host means the file check returned 404 or 410. turned_away means that file check was turned away and the HTTP status was not recorded. unknown means ARC could not read the file. Empty means this check is not recorded, including an invalid profile with no file check. This column is not no. |
 | `ucp_file_checked_at` | UTC date of the /.well-known/ucp file check. Empty when that check is not recorded. |
-| `webmcp` | Does the homepage declare WebMCP tools for in-browser agents? yes / no / not_tested (checks before 6 Oct 2026). |
+| `webmcp` | Did ARC see Shopify's storefront WebMCP adapter in the homepage HTML? yes / no / not_tested (checks before 6 Oct 2026). ARC does not yet detect other WebMCP setups (tools registered by script in the browser), so no means the Shopify adapter was not seen, not that the site has no WebMCP. |
 | `blocks_ai_crawlers` | Does robots.txt disallow at least one of the AI crawlers ARC tracks (answer, search or training bots) from the homepage or tested product? yes / no / unknown (robots.txt could not be read). A rule in a file, not an observed block. |
 | `blocks_ai_answer_agents` | Same, but only for AI assistants fetching pages for a user (for example ChatGPT-User, Perplexity-User). yes / no / unknown. |
 | `browser_cart_test` | Result of ARC's separate browser cart test, where it exists (about 90 stores): for example "2 of 5 added to cart". Empty means no browser test. |
@@ -161,7 +161,7 @@ Each snapshot lives in its own immutable version folder and is copied to `latest
 ### Versioning
 
 - A version folder never changes once published. The first export on a date is `YYYY-MM-DD/`; any later export on the same date is published as `YYYY-MM-DD.r2/`, `YYYY-MM-DD.r3/` and so on. The exporter refuses to overwrite an existing version.
-- `latest/` is a moving copy of the newest version. To cite exact numbers, cite the version folder (for example `/data/2026-10-07.r5/`), not `latest/`. On 13 Oct 2026 the answer text was corrected in `latest/store_answers` and in the 2026-10-09 and 2026-10-12 folders. `2026-10-09` has no OpenStreetMap-derived rows. `2026-10-12.r2` is mixed licence (CC BY 4.0, except 203 OpenStreetMap-derived rows under ODbL-1.0, attributed to OpenStreetMap contributors). `2026-10-12.r3` drops those rows and is CC BY 4.0. `2026-10-30` also has no OpenStreetMap-derived rows, is CC BY 4.0, and is the edition `latest/` cites. Neither date's folders contain unpublished discovery-source rows. See the erratum in `/data/history/README.md`.
+- `latest/` is a moving copy of the newest version. To cite exact numbers, cite the version folder (for example `/data/2026-10-07.r5/`), not `latest/`. On 13 Oct 2026 the answer text was corrected in `latest/store_answers` and in the 2026-10-09 and 2026-10-12 folders. `2026-10-09` has no OpenStreetMap-derived rows. `2026-10-12.r2` is mixed licence (CC BY 4.0, except 203 OpenStreetMap-derived rows under ODbL-1.0, attributed to OpenStreetMap contributors). `2026-10-12.r3` drops those rows and is CC BY 4.0. `2026-10-30` also has no OpenStreetMap-derived rows and is CC BY 4.0. Neither date's folders contain unpublished discovery-source rows. See the erratum in `/data/history/README.md`.
 - `versions.json` lists every version with its `generated_at`, `supersedes`, method version, stores checked and row counts.
 - Before this rule (7 Oct 2026), `/data/2026-10-07/` was regenerated four times during the day (rails_checks went from 607 to 647 to 1,044 rows). All five published versions are restored byte-for-byte from the commits that published them, as `2026-10-07/` (r1) to `2026-10-07.r5/`; their manifests carry `restored.source_commit`.