On six single edits to a public KiCad 10 design, three runs each, plain Claude Code with KiCad installed got 18 of 18 right; with the mcp-server-kicad plugin it got 3 of 18. The plugin had no tool for some edits, its rule against direct file edits made the model stop and ask, and its board-sync tool rewrote nearly every footprint. The maintainer put the project in maintenance mode on these results.