Scope: Dish Racks, Drain Boards & Sink Caddies — anything that holds, drains, or dries washed dishes/utensils at the sink (racks, flat drying boards/mats) plus caddies that organize sink-side cleaning tools (sponge, brush, soap). Excludes dishwashers, drying cloths/towels, and cutting-board-specific racks.

Seed: 1) The dish-rack equivalent of "weave" is frame material + drainage mechanism: whether the rack sheds water through a spout/drain vs pools it, and whether the metal is self-protecting stainless or a coating over bare steel, decides rust and mold risk — not price or tier count. 2) A ship's cook notices stability and mounting first: a tippy countertop rack with no way to secure it, or a caddy that just sits loose, is useless in a moving or cramped galley, so footprint/anti-slip feet and mount type (suction/hook vs freestanding) matter more to this persona than capacity.

Sources:
[polder_harmony_dish_rack] https://polder.com/products/harmony-dish-rack — bamboo+plastic single-tier rack, 8-plate capacity, 2 drain trays + spout, utensil bin — fetched excerpt
[polder_harmony_sink_caddy] https://polder.com/products/harmony-sink-caddy — bamboo+plastic caddy, drain openings in bamboo, integrated dividers, hand wash only — fetched excerpt
[polder_insink_dish_rack] https://polder.com/products/expandable-in-sink-dish-rack — stainless steel, expandable arms rest in/over sink, no countertop footprint — fetched excerpt
[polder_foldaway_dish_rack] https://polder.com/products/fold-away-dish-rack — stainless steel + plastic, folds flat for storage, knife block + utensil bin — fetched excerpt
[polder_advantage_dish_rack] https://polder.com/products/4-piece-advantage-dish-rack — brushed stainless steel, slide-out second tray under main rack, glossy plastic drain tray — fetched excerpt
[polder_microfiber_mat] https://polder.com/products/microfiber-mat-with-tray — flat absorbent microfiber mat + snap-off glass drain tray, no rack structure — fetched excerpt
[simplehuman_steel_frame_dishrack] https://www.simplehuman.com/products/steel-frame-dishrack-standard — solid stainless frame, 360° swivel spout, hydrophilic-coated tray, silicone-capped wires, "resists rust and fingerprints" — fetched excerpt
[simplehuman_sink_caddy] https://www.simplehuman.com/products/sink-caddy-standard — brushed stainless caddy, suction cups + wire ledge hanger mount, vent holes "minimizing bacteria growth" — fetched excerpt
[wikipedia_sae_steel_grades] https://en.wikipedia.org/wiki/SAE_steel_grades — composition table: grade 201 = 16–18% Cr/3.5–5.5% Ni; grade 304 = 18–20% Cr/8–10.5% Ni, "classic 18/8" — fetched excerpt
[wikipedia_stainless_steel] https://en.wikipedia.org/wiki/Stainless_steel — chromium ≥10.5% forms self-healing passive film; 18/8 = type 304; austenitic grades usually non-magnetic — fetched excerpt
[good_housekeeping_best_dish_racks] https://www.goodhousekeeping.com/what-to-buy/g33392977/best-dish-racks/ — coated-wire rack's wires "treated with Microban to prohibit the growth of bacteria" — fetched excerpt

Branches: product_type=dish_rack routes to dish_rack_format/tier_count/capacity_class/drainage_mechanism/utensil_holder — those are exactly the specs polder_advantage_dish_rack and simplehuman_steel_frame_dishrack describe (tray/tier format, drain spout, cutlery holder). product_type=sink_caddy routes to caddy_mounting/caddy_compartment_count/caddy_ventilation and drops rack-only facets — sink caddies hold cleaning tools, not dishes (polder_harmony_sink_caddy, simplehuman_sink_caddy both sell caddy as a distinct SKU from the dish rack). product_type=drying_mat_or_board routes to drying_surface_type/drainage_mechanism and drops tier/utensil-holder facets — the microfiber mat has no rack structure at all (polder_microfiber_mat). countertop_space=none_use_sink_only favors dish_rack_format=in_sink_expandable, which trades footprint for a stated weight limit since it is unsupported by the counter (polder_insink_dish_rack); that same page's feature list has no wine-glass-holder line, supporting makes_irrelevant: [wine_glass_rack] on this leg.

Noise: color/finish options (white/gray) — cosmetic, not an expert axis. Warranty length (simplehuman: 5-year) — brand policy, not comparable across brands with one source. SKU/product codes — internal catalog numbers, not buyer-facing. Price — excluded per rule. Exact single-source dimensions (e.g. "19.6 x 13.5 x 6.2 in") — kept out of facet ranges since only one brand sourced each; mentioned only as scratch context, not asserted as a general threshold.

Corrections (2026-10-26):
- Added drainage_mechanism to the drying_mat_or_board branch's then_ask (and capacity_class to its makes_irrelevant) so the mat_evaporates value is reachable.
- Added facet tray_surface_treatment (hydrophilic/hydrophobic/untreated), wired into the dish_rack branch; sourced to simplehuman_steel_frame_dishrack ("hydrophilic coating ... super-fast evaporation") and polder_advantage_dish_rack ("hydrophobic surface texture ... eliminates pooling"), both re-fetched and grepped to confirm.
- Added facet antimicrobial_treatment (present/absent), wired into the dish_rack branch; sourced to new reference good_housekeeping_best_dish_racks ("treated with Microban to prohibit the growth of bacteria"), fetched and grepped. Single-sourced, same precedent as the existing wine_glass_rack and foldable_for_storage facets.
- Reclassified caddy_compartment_count and caddy_ventilation from source=listing to source=researched; their own backfill_note already said to count dividers/perforations from photos, not a listing text field.
- Added tier_count to the dish_rack branch's then_ask so it is reachable (it was previously only named in two makes_irrelevant lists).
- Added a skip_if_known entry to the countertop_space split naming product_type=sink_caddy/drying_mat_or_board, since that split's only payload (dish_rack_format) doesn't apply to those types.
- Added the uncited dish_rack product_type leg and the wine_glass_rack/none_use_sink_only leg to the Branches line above, citing polder_advantage_dish_rack/simplehuman_steel_frame_dishrack and polder_insink_dish_rack (re-fetched: its feature list has no wine-glass line) respectively.
- Rejected: check.md Part F item 3 (non-slip base feet) and item 4 (fingerprint-resistant finish) were flagged as findings, not required fixes, and check.md itself calls item 4 minor/already-covered by the Noise exclusion; left both out of scope for this fix pass.