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Kicad File Format

o2scale/electronics-agent-kit

If you're programmatically reading or writing KiCad schematics and PCBs, this is your reference sheet. It covers the S-expression format for both .kicad_sch and .kicad_pcb files in KiCad 8.x, with concrete examples of symbols, wires, footprints, traces, vias, and zones. The documentation is practical: it shows you exactly how to structure a symbol instance with properties, how net numbers work across pads and segments, and what a hierarchical sheet block looks like. This is the kind of thing you want when you're building automation for board generation or parsing existing designs, not clicking around in the GUI.

skills.sh installs
232
GitHub stars
14
last updated
Aug 21, 2026
View on GitHub

Install

$ npx -y skills add o2scale/electronics-agent-kit --skill kicad-file-format --agent claude-code

Installs into .claude/skills of the current project.

Files

KiCad File Format Reference

Complete reference for KiCad 8.x S-expression file formats.

KiCad uses Lisp-style S-expressions for all file formats. Files are human-readable and text-based.

1. S-Expression Basics

Syntax

(keyword value)
(keyword (nested value))
(keyword
  (child1 value)
  (child2 value)
)

Common Patterns

  • Coordinates: (at x y angle) or (xy x y)
  • UUIDs: (uuid "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")
  • Strings: "quoted string" or unquoted_identifier
  • Numbers: 1.234 (always decimal, no units in file)
  • Booleans: yes / no

2. Schematic Format (.kicad_sch)

File Structure

SKILL.md on GitHub

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Details

Repository
github.com/o2scale/electronics-agent-kit
Categories
Documentation, Code Review & Quality, AI & Agent Building
First seen
Jun 3, 2026

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