{"name":"floor_joist","title":"Floor Joist Span Calculator","category":"trades","description":"Joist size/spacing feasibility and count for a floor span under a given live load.","price_usd":0.001,"input_schema":{"type":"object","properties":{"span":{"type":"number","description":"Clear span in feet"},"room_width":{"type":"number","description":"Room width (joist run) in feet"},"spacing_in":{"type":"number","description":"Joist spacing on-center in inches (default 16)"},"species":{"type":"string","description":"Lumber species/grade group"},"grade":{"type":"string","description":"Lumber grade"},"live_load_psf":{"type":"number","description":"Live load in psf (default 40)"}},"additionalProperties":false,"required":["span","room_width"]}}