Analog circuits rarely fail at typical. They fail at the edges: fast silicon, a hot die, a low supply. Cascodex simulates all 45 PVT corners of your design in ngspice. When a spec fails, an AI agent traces it to the device causing it, edits the netlist and re-runs every corner before calling it fixed. On our benchmark it found verified fixes in 32 of 33 runs, at about $0.08 each. Corner maps, waveforms, shareable reports and CI included. Free on the open SkyWater SKY130 process.