copperhead

A schematic, a bill of materials, a power budget and a stack of design notes can drift apart without anything breaking, and the mismatch usually surfaces only when the first board is powered up. copperhead is an open-source AI agent aimed at that drift. Ask it for a change and it edits the real KiCad files, updates every document that references them, and keeps going until KiCad's own ERC and DRC checks pass.

Starting from a written brief, it can also run eight stages in order, from spec, architecture and parts through schematic, layout, fabrication outputs, firmware and a bring-up plan, and a stage only counts once its artifact is on disk. The CLI is free under Apache-2.0 and runs with Node 20, kicad-cli and your own Claude or GPT-5 key, while hosted runs and team features sit on paid plans. It will not run on a dirty git tree, and it rejects any change that breaks a budget or constraint you have written down.