Scope: Playing Accessories = small items a musician holds, wears, or applies to the instrument/bow while actively playing — picks/plectrums (incl. finger/thumb picks), capos, straps, slides, drum sticks/mallets/brushes, bow rosin, and reeds/mouthpiece ligatures. Excludes cleaning/maintenance supplies (musical-instrument-care), cases/bags/stands (musical-instrument-cases), replacement parts like strings/pickups/tuning pegs (musical-instrument-parts), effects pedals (musical-pedals), and tuners/metronomes/music stands (metronomes) — all sibling leaves under supplies > gear.

Seed: Ran scripts/seed.py --category musical-playing-accessories. Kept: the leaf bundles ~7 distinct product types with no shared spec sheet; routing by accessory_type first, then a second split (pick_style) inside the pick branch, is the only way to avoid asking a drummer about capo mechanisms.

Sources:
[wikipedia_plectrum] https://en.wikipedia.org/wiki/Plectrum — pick materials (celluloid/metal/delrin), gauge/shape vary — fetched excerpt
[wikipedia_capo_device] https://en.wikipedia.org/wiki/Capo_(musical_device) — capo mechanisms (strap-on, spring-clamp trigger, screw/lever-lock, rolling, partial) — fetched excerpt
[wikipedia_slide_guitar] https://en.wikipedia.org/wiki/Slide_guitar — slide material (glass/metal/polycarbonate) changes sustain/timbre; length changes fretting — fetched excerpt
[wikipedia_drum_stick] https://en.wikipedia.org/wiki/Drum_stick — stick numbering 2(heavy)-11(light) + letter tip code; wood/nylon/acetal tips — fetched excerpt
[wikipedia_percussion_mallet] https://en.wikipedia.org/wiki/Percussion_mallet — beater types (sticks/mallets/brushes/rutes), mallet head materials — fetched excerpt
[wikipedia_rosin] https://en.wikipedia.org/wiki/Rosin — light rosin for violin/viola/humid, dark for cello/dry; softness scales with instrument size — fetched excerpt
[wikipedia_reed_mouthpiece] https://en.wikipedia.org/wiki/Reed_(mouthpiece) — reed strength scale 1-5, not standardized; cane vs synthetic — fetched excerpt
[wikipedia_clarinet] https://en.wikipedia.org/wiki/Clarinet — corroborates reed strength 1(soft)-5(hard), not standardized — fetched excerpt
[wikipedia_ligature_instrument] https://en.wikipedia.org/wiki/Ligature_(instrument) — ligature materials (metal/fabric/string/leather), band vs pressure-plate contact — fetched excerpt
[wikipedia_guitar_straps] https://en.wikipedia.org/wiki/Guitar#Straps — strap buttons/pins vs strap locks — fetched excerpt
[levys_leathers_straps] https://www.levysleathers.com/straps — specialist strap brand filters by Material (leather/suede lines) — fetched excerpt

Branches: accessory_type (pick/capo/strap/slide/stick_mallet_or_brush/rosin/reed_mouthpiece_or_ligature) is the top split — supported by each type's defining spec being disjoint (gauge vs mechanism vs lock vs material vs size vs grade vs strength, per sources above). pick_style (flatpick vs fingerpick/thumbpick) is a second split nested under accessory_type=pick — supported by wikipedia_plectrum noting players "wear" metal/plastic thumb picks and fingerpicks as a distinct manner of play from holding a flat pick, which changes whether gauge-in-mm is the relevant spec.

Noise (spec-sheet rows left out): Dunlop/D'Addario/Fender picks pages, Ernie Ball straps page, Britannica rosin, and a Dunlop gauge-color chart were all blocked (403/Cloudflare/404) this run — pick gauge is kept as a qualitative thin/medium/heavy facet rather than a sourced mm range for this reason. Rosin light/dark grading is single-sourced (Wikipedia only); flagged as a judgement rather than claimed as dual-sourced. No derived metric (e.g. price-per-unit) is included — no two-number spec-sheet pair was fetched for this leaf.

Corrections (2026-10-26):
- Added split `reed_or_mouthpiece_part` (reed/mouthpiece/ligature) under accessory_type=reed_mouthpiece_or_ligature so a mouthpiece buyer is no longer asked reed_strength/reed_material; added facets `mouthpiece_material` and `tip_opening_or_facing`, sourced to new reference wikipedia_mouthpiece_woodwind.
- Added facets `mallet_hardness` and `handle_material` to the stick_mallet_or_brush branch, sourced to wikipedia_percussion_mallet (new supports lines added to that reference).
- Added facet `stick_instrument_match` to stick_mallet_or_brush, mirroring rosin_instrument_match/capo_instrument_fit, sourced to wikipedia_percussion_mallet + wikipedia_drum_stick.
- Fixed `stick_size` backfill_note so the 5a default only applies when stick_type=drum_stick; mallets/brushes/rute now default to unspecified.
- Added vocabulary entry for "Rute" (stick_type), "Rolling capo" and "Fifth-string capo" (capo_mechanism), and "Embouchure" (reed_strength).
- Retagged `slide_fit` from source:listing to source:researched per the house rule, since its own listing_field_hint says the value must be inferred, not read directly.
- Softened `reed_strength.range.typical` to match what wikipedia_reed_mouthpiece actually says (commonly sold 2–5 in half-steps), dropping the unsourced "student/intermediate 2.5–3.5" claim.
- Rejected nothing from check.md's 8 required fixes; all 8 applied.