The maintainer found copperhead's pin-to-net answers wrong on 51.6% of pins across 17 KiCad demo projects when checked against KiCad's own netlist.
Recurring agent failure issue in copperhead (copperheadhq)
What engineers report
A recurring agent failure problem in copperhead (copperheadhq) that mostly hits the electrical engineer.
Failure pattern: agent / failure
Analyst note
From the Grok pain-radar digests, Nov 7-8 2026 (Nov 7 8:41 PM ET through Nov 8 7:41 AM ET digests plus the Haitch overnight edition). Verified live 2026-11-08: issue/PR read; title and state confirmed.
What it costs a team
Modeled annual cost
$30,000
For a team of 5
Prototype delay
3 days
Modeled schedule slip per occurrence
Time lost
240 min
Per engineer per month, about 1 incidents
How the cost is modeled
240 min/month × 5 engineers × 12 months = 240 hours × $125/hour = $30,000
A modeled estimate with medium confidence. Swap in your own team size and loaded rate to size it for your team.
Engineering tools that address it
No engineering tool profile lists this error yet. Browse tools that connect to copperhead (copperheadhq).
Evidence
More recurring errors in copperhead (copperheadhq)
- An agent PCB tool cannot refill copper zones, so on pour-heavy boards people bypass it with scripts and lose every check it provides. On one power board that happened three times in a day, and each time the change was made with a pcbnew Python script plus kicad-cli drc --refill-zones --save-board, which bypasses the spec gate, its ERC/DRC verification and its rollback.ECAD · impact 74
- An AI board-creation agent ran part selection on a 283-row BOM with a fixed 40-turn budget, when the job needs about 104 turns. When the agent said at turn 37 that it could not finish in the turns left, the runner did not treat that as budget exhaustion, so retries got the same budget and every verified symbol, pin, footprint and part swap was thrown away on rollback. The fix caches verified parts in a file so retries keep them.ECAD · impact 74
- The agent's finish gate wanted zero ERC and DRC violations. On LibreSolar's BMS C1, an imported board with 368 ERC findings and 168 DRC findings, the requested rename ended "stalled" and was rolled back. The fix records ERC and DRC before the first edit and only fails on findings the run added. Any agent working on a real, inherited design needs to know what the design looked like before it touched it.ECAD · impact 74
- A CI runner image change quietly swapped KiCad 10 for KiCad 9 (ubuntu-latest moved to 26.04 and the KiCad PPA had no build for that image variant), so every PR then failed with 27 board and schematic load errors in tests it never touched.ECAD · impact 66
- A refused part-selection attempt rolled back all already-verified symbols and footprints, and the run only passed after the user hand-raised the stage budget from 40 to 120 turns.ECAD · impact 66
- An agent that takes a hardware project through eight stages from spec to KiCad schematic and firmware could mark a stage done with a comment-only spec, a schematic sheet with zero symbols, or empty firmware folders, and the next stage would build on that after a resume.ECAD · impact 66
Sourced from public community reports. Costs and delays are modeled estimates, not measurements. Know a better source or a fix? Tell us at hello@productflo.io.