codex-kicad-mcp
A safe, read-first Model Context Protocol
server for KiCad workflows. It discovers KiCad projects, parses schematics and
PCBs into structured data, and runs ERC/DRC checks through kicad-cli without
editing design files. MCP resources expose the same data through stable URIs,
prompts provide structured task instructions, and an opt-in write API performs
snapshot-backed, audited minimal edits.
Install
uv pip install codex-kicad-mcp
Or from a source checkout:
cd mcp
uv pip install -e ".[dev]"
Run
Set KICAD_WORKSPACE to the directory that contains your .kicad_pro
projects, then start the stdio server:
$env:KICAD_WORKSPACE = "C:/path/to/eda-workspace"
codex-kicad-mcp
Every tool resolves paths below KICAD_WORKSPACE; attempts to escape fail
before any file access or command runs. See
docs/security-model.md for the full trust
boundaries.
Tools
| Tool | Reads | KiCad required |
|---|---|---|
kicad_cli_version |
CLI version | Yes |
list_kicad_projects |
Workspace tree | No |
inspect_project |
Project file inventory | No |
project_summary |
Project JSON and inventory | No |
read_schematic |
Schematic S-expression | No |
read_pcb |
PCB S-expression | No |
read_hierarchy |
Sheet hierarchy and pins | No |
read_buses |
Bus geometry and entries | No |
read_netlist |
Netlist CLI export | Yes |
read_bom |
BOM CLI export | Yes |
read_board_metrics |
Board size and copper totals | No |
read_layer_stackup |
Stackup or layer table | No |
read_zones |
Copper zones and polygons | No |
read_vias |
Vias and layer pairs | No |
run_kicad_cli_check |
Structured ERC/DRC JSON | Yes |
analyze_power_rails |
Netlist power topology | Yes |
check_decoupling |
Netlist and PCB capacitor placement | Yes |
cross_probe |
Schematic, netlist, and PCB matches | Yes |
compare_schematic_pcb |
Netlist-to-PCB parity | Yes |
run_design_review |
Unified review findings | Yes |
analyze_signal_integrity |
PCB routing geometry | No |
analyze_board_density |
PCB occupancy metrics | No |
check_fabrication_readiness |
PCB manufacturing readiness | No |
preview_write |
Dry-run edit plan (opt-in) | No |
confirm_write |
Execute previewed edit (opt-in) | No |
rollback_snapshot |
Restore snapshot files (opt-in) | No |
list_snapshots |
Write snapshot inventory (opt-in) | No |
get_write_audit |
Append-only audit log (opt-in) | No |
Write tools are inert unless KICAD_ENABLE_WRITES=1 is set exactly; see
docs/tool-reference.md for the preview →
confirm pipeline, token binding, and audit record shape.
Resources
Nine resources under codex-kicad://projects/{project}/… mirror the read
tools: manifest, raw (suffix allowlist, size-bounded), schematic, pcb,
hierarchy, netlist, bom, stackup, and report (normalized local
ERC/DRC JSON). The {project} parameter is the percent-encoded
workspace-relative .kicad_pro path.
Prompts
Seven prompts render structured task instructions (never writes):
audit_project, generate_bom_report, review_power_distribution,
review_signal_integrity, cross_probe_issue, prepare_fabrication, and
summarize_project_for_handoff.
Configuration
All limits are read at call time; invalid values raise a tool error instead of being clamped.
| Variable | Default | Purpose |
|---|---|---|
KICAD_WORKSPACE |
— (required) | Root directory for all project paths |
KICAD_MAX_FILE_BYTES |
33554432 | Largest artifact accepted for parsing |
KICAD_MAX_SEXPR_TOKENS |
1000000 | S-expression token budget |
KICAD_MAX_SEXPR_DEPTH |
512 | S-expression nesting budget |
KICAD_MAX_RESULT_ITEMS |
100000 | Item cap per response |
KICAD_MAX_CLI_OUTPUT_BYTES |
1048576 | CLI stdout/stderr cap per response |
KICAD_CLI_VERSION_TIMEOUT |
15 | Seconds for kicad-cli --version |
KICAD_CLI_CHECK_TIMEOUT |
120 | Seconds for an ERC/DRC check |
KICAD_EXPORT_TIMEOUT |
120 | Seconds for a netlist or BOM export |
KICAD_ENABLE_WRITES |
unset (writes off) | Set exactly 1 to enable the write API |
KICAD_SNAPSHOT_ROOT |
<workspace>/.kicad-mcp-snapshots |
Directory for write snapshots and audit log |
KICAD_WRITE_TOKEN_TTL |
900 | Confirm-token lifetime in seconds |
KICAD_WRITE_PREVIEW_TTL |
1800 | Preview plan lifetime in seconds |
KICAD_MAX_SNAPSHOTS_LISTED |
50 | Cap on list_snapshots results |
The complete tool contract lives in
docs/tool-reference.md.
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