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Use it to assemble and sanity-check a subsystem, e.g. 3-4 reaction wheels for an ADCS.","write_action":false,"price_micros":0,"input_schema":{"type":"object","properties":{"items":{"type":"array","items":{"type":"object","required":["id"],"properties":{"id":{"type":"integer","description":"product id"},"qty":{"type":"integer","description":"quantity, default 1"}}},"description":"components of the stack"},"bus_v":{"type":"number","description":"power bus voltage, V — each item is checked against its supply range"}},"required":["items"]}},{"name":"check_fit","description":"Check whether a set of products docks together, by the interface template of each product type: deployer and CubeSat structure form factor and satellite mass, separation system and spacecraft mass, solar panel size and EPS solar input (Voc/Vmp, power), battery and EPS, EPS output rails or the unregulated bus against each unit supply range, EPS charge current against the battery limit, satellite envelope against the deployer envelope for its form factor, on-board computer against unit data interfaces, board stack format, free volume, radio against antenna and ground station (frequency, band, connector, protocol and modulation), antenna against ground station polarization, GNSS receiver signals against the GNSS antenna band, magnetorquer coil current against the driver channel, PPU output power against the electric thruster, array drive against panel power, propulsion propellant against tank media, steady power budget. Verdicts fits / conflict / check / unknown, plus ask_vendor: exactly which values are missing to decide.","write_action":false,"price_micros":0,"input_schema":{"type":"object","properties":{"items":{"type":"array","items":{"type":"object","required":["id"],"properties":{"id":{"type":"integer","description":"product id"},"qty":{"type":"integer","description":"quantity, default 1"}}},"description":"products of the spacecraft, deployer or ground segment (ids from match_components)"}},"required":["items"]}},{"name":"design_stack","description":"Assemble a whole spacecraft bus from a plain-language task: the service plans the subsystems, matches every item deterministically against the stated requirements, computes the mass/power budget and writes an evidence-bound rationale. Pass fixed = product ids you have already chosen (from match_components or get_datasheet_digest): they stay in their subsystems, are checked against the requirements (selected.fixed, fixed_verdict, fixed_fails) and the rest is assembled around them. LLM-backed and rate-limited (6/min, 30/h anonymous).","write_action":false,"price_micros":0,"input_schema":{"type":"object","properties":{"q":{"type":"string","description":"the task, e.g. \"6U CubeSat bus on 12 V with S-band radio and GNSS, star tracker better than 10 arcsec\""},"fixed":{"type":"array","items":{"type":"integer"},"description":"product ids to keep (locked parts)"}},"required":["q"]}},{"name":"explain_properties","description":"What every property of a product category means: definition, how it is measured and what goes into the measurement condition, how to use it when selecting, what it is commonly confused with, typical range and related properties. 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