Scope: Playhouses, Tents & Tunnels (supplies > play > outdoor-play-structures > playhouses) — rigid outdoor playhouses (plastic or wood), fabric play tents (indoor/outdoor, pop-up or pole), and crawl tunnels, including tent+tunnel combo sets. Excludes swing sets/climbers (swing-sets, slides siblings), inflatable bouncers, sandboxes, trampolines, water play — separate catalog leaves.

Seed:
1. Equivalent of harvest_date: the flammability test the fabric was passed against (CPAI-84 / 16 CFR 1500.44 / ASTM F963 Annex A5) — almost never on the listing, decides whether a tent/tunnel is legally sellable, found only on brand compliance pages.
2. A product-safety reviewer would notice first whether a "toy" tent/tunnel is exempt from ASTM F963 (sporting/camping goods for 12-and-under are excluded) yet still needs CPSIA cert — a gap a typical buyer never checks.

Sources:
[cpsc_sporting_camping] https://www.cpsc.gov/FAQ/Sporting-and-Camping-Equipment — flammability test protocols + ASTM F963-17 exclusion for 12-and-under sporting/camping goods — fetched excerpt: "manufacturers ... should conduct flammability testing to one of these three ... protocols: (1) 16 CFR § 1500.44, (2) ... Annex A5 of ... ASTM F963-17, or (3) the voluntary standard CPAI-84" and "sporting and camping goods designed or intended primarily for children ages 12 and under are specifically excluded from the US Toy Standard, ASTM F963-17, but would still need to meet certain other mandatory children's product safety requirements."
[compliancegate_tent_regs] https://www.compliancegate.com/camping-tent-regulations-united-states/ — same three-protocol flammability requirement, independent confirmation — fetched excerpt: "CPAI-84 – A Specification for Flame-Resistant Materials Used in Camping Tentage" and "16 CFR Part 1500.44 – Method for determining extremely flammable and flammable..."
[swingsetmall_wood_vs_plastic] https://www.swingsetmall.com/blog/wood-vs-plastic-playhouse/ — plastic vs wood playhouse tradeoffs — fetched excerpt: "Plastic playhouses need zero maintenance ... ready to play in as soon as they're delivered" / "Sunlight breaks down the pigment in molded plastic over a few summers ... surfaces turn chalky" / "most plastic playhouses have an expiration date - usually kids under six" / "Cedar and redwood playhouses hold up for 10-15 years" / "Pine needs even more [care]" / plastic assembly "an hour or two at most" vs wood kit "an entire weekend" and "bigger models need two adults."
[wendy_house_wikipedia] https://en.wikipedia.org/wiki/Wendy_house — primer on playhouse forms and origin — fetched excerpt: "Size and solidity can vary from a plastic kit to something resembling a real house" and the 1904 stage prop "was constructed like a tent so that it could be erected quickly."
[pacific_tickle_tunnel] https://pacificplaytents.com/tickle-me-9ft-geo-tunnel-95200/ — tunnel spec sheet — fetched excerpt: "9' Institutional Tunnel ... High Quality Polyester ... Geometric Shaped Mesh Windows."
[pacific_halfmesh_tunnel] https://pacificplaytents.com/half-mesh-play-tunnel-20403/ — tunnel frame material — fetched excerpt: "Constructed with sturdy hardened spring steel. Mesh panels promote air circulation."
[step2_playhouses_collection] https://www.step2.com/collections/playhouses — plastic playhouse age range — fetched excerpt: "Most kids' playhouses are designed for ages 18 months to 6 years, with the best fit depending on the specific model."
[backyarddiscovery_wood_playhouses] https://www.backyarddiscovery.com/collections/wooden-playhouses — wood species in market — fetched excerpt: "Outdoor cedar playhouse" / "Durable cedar playhouse" / "built from natural cedar" (repeated across Mystic, Beacon Heights, Timberlake models).

Branches:
- product_type → playhouse: "Plastic playhouses need zero maintenance... Wood costs more upfront" (swingsetmall) shows the material facets only apply once you know it's a rigid playhouse, not a tent or tunnel.
- product_type → play_tent: Wendy house source shows the fabric/pop-up form is a distinct lineage from the rigid kit.
- product_type → play_tunnel: Pacific Play Tents sells tunnels as their own nav category with frame-material claims (spring steel) separate from tents and playhouses.
- primary_setting → indoor_only makes uv_stabilization and maintenance_need irrelevant: both only matter for sun/weather exposure (swingsetmall fade claim is explicitly about sunlight).

Noise (spec-sheet rows seen, not made facets):
- Exact footprint/weight-capacity numbers — only single-brand data points found (no second brand confirming a range); left out rather than inventing a range.
- Price — excluded per rule (never a facet).
- Brand-specific accessory lists (mailbox, doorbell, play kitchen) — folded into play_feature_set instead of separate facets.
- Tunnel exact length in feet — only one brand's data point (9 ft) seen twice from the same company; used modular_connectivity (standalone vs connects to tents/other tunnels) instead, which is sourced from Pacific's own category structure.

Corrections (2026-10-26):
- Added `playground_safety_standard` facet (playhouse branch) so `slide_or_climber_attached` has a governing standard: CPSC's handbook excludes home playground equipment from the public-playground rules and names ASTM F1148 as the standard that covers it instead (not F2049, which is a fences/barriers standard for public play areas — checked both via archive.org/direct fetch).
- Re-sourced `fold_flat_storage`: dropped the tunnel citation (supported carry-bag, not disc-fold) and cited two Pacific Play Tents pop-up tent pages that state the tent frame is folded flat before going into the carry bag.
- `roof_style`: changed `source` from `listing` to `researched` — its own hints already conceded it's photo/default-inferred, not a stated field.
- `housing_material`: dropped the uncited `resin_composite` value (Step2 uses "resin" as marketing language for its rotomolded plastic, not a distinct material); updated `maintenance_need`'s backfill_note to match.
- Added vocabulary entries for `16 CFR 1500.44`, `pole_and_sleeve`, and `hub_frame_fold` (used as facet values, previously undefined).
- `age_range`: merged `toddler_18mo_to_3`/`preschool_3_to_6` into one `toddler_through_preschool_18mo_to_6` value — the only source gives one 18mo-6yr band, no second source for an internal 3-year split.
- `tent_tunnel_combo_set` branch: added `tent_fabric` and `ventilation` to `then_ask`, previously only asked on the standalone tent/tunnel branches.
- Reworded `primary_setting`'s question to "Outdoors only, indoors only, or both?" so it elicits `indoor_only` as a genuine third option instead of reading as a sub-case of outdoors.
- Rejected: did not add a second source for `fold_flat_storage` beyond the two Pacific Play Tents pages, or for the new `playground_safety_standard` facet beyond CPSC + ASTM — both are categorical/regulatory claims, not numbers, and the register's existing convention (Part A) accepts single clean sources for such claims; here two independent pages/bodies were available so both are cited.