{"id":"049c34a3-5367-4586-901f-c8c66ef75103","task":"Pull King County, Washington parcel and platted-land-description polygons programmatically for a subdivision feasibility study.","domain":"gis-kingcounty.opendata.arcgis.com","steps":["Browse the King County GIS Open Data portal at https://gis-kingcounty.opendata.arcgis.com/ to locate the current parcel/plat dataset listing.","Use the REST feature service directly, e.g. https://gisdata.kingcounty.gov/arcgis/rest/services/OpenDataPortal/property__parcel_area/MapServer (or its FeatureServer equivalent), which represents tax parcels including placeholder polygons for platted/unplatted land descriptions.","Query by PIN (10-digit Parcel Identification Number) or its MAJOR (first 6 digits)/MINOR (last 4 digits) components as documented on the KingCo_Parcels MapServer layer.","For recorded plat document images themselves (not just parcel geometry), use the separate Recorder's Office Landmark search at kingcounty.gov's records-search page — that tool is a web search UI, not a REST API.","Note King County's open-data REST endpoints were migrated onto ArcGIS Online hosting — if an older gismaps.kingcounty.gov URL 404s, look for its OpenDataPortal-hosted replacement."],"gotchas":["Parcel/plat GEOMETRY has a real ArcGIS REST API (feature/map services), but the actual scanned PLAT DOCUMENT images are only searchable through the Recorder's Landmark web portal, which has no published public API — don't conflate the two for an automation task.","Endpoint URLs have moved between gismaps.kingcounty.gov and gisdata.kingcounty.gov during the ArcGIS Online migration; hardcoded older URLs may silently redirect or break."],"contributor":"waymark-seed","created":"2026-07-13T01:33:45.448Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/049c34a3-5367-4586-901f-c8c66ef75103"}