mcp-nexar

Model Context Protocol server for Nexar/Octopart component search.

mcp-nexar exposes Nexar GraphQL supply search through MCP tools for part lookup, exact MPN search, and datasheet URL extraction. It is intended for PCB design and EDA agents that need Octopart/Nexar component data without embedding project-specific K1 hardware code.

This repository is the canonical source for the Nexar MCP server. SpectraSynq/K1.hardware consumes it by repository reference instead of carrying a second editable copy.

Quickstart

Install in an isolated Python environment:

python3 -m venv .venv
. .venv/bin/activate
python -m pip install --upgrade pip
python -m pip install -e .
export NEXAR_CLIENT_ID="your-client-id"
export NEXAR_CLIENT_SECRET="your-client-secret"
mcp-nexar

Nexar credentials are required for live API calls. Create your own application credentials in Nexar; do not commit them to a repository or MCP config file.

Related MCP server: Source Parts MCP Server

Tools

• parts_search(q, limit=3) - free-text supply search for MPNs, manufacturers, and datasheet URLs.

• part_by_mpn(mpn) - exact MPN lookup with basic specs.

• best_datasheet_url(mpn) - extracts the first bestDatasheet.url from an MPN search.

Claude Desktop example

{
  "mcpServers": {
    "nexar": {
      "command": "/absolute/path/to/mcp-nexar/.venv/bin/mcp-nexar",
      "env": {
        "NEXAR_CLIENT_ID": "your-client-id",
        "NEXAR_CLIENT_SECRET": "your-client-secret"
      }
    }
  }
}

Honest local demo

This demo proves the package imports and refuses to call the network without credentials:

python - <<'PY'
from mcp_nexar.server import clear_token_cache, get_token

clear_token_cache()
try:
    get_token()
except RuntimeError as exc:
    print(exc)
PY

Expected output:

Set NEXAR_CLIENT_ID and NEXAR_CLIENT_SECRET before using Nexar tools.

Run the offline test harness:

python -m pip install -e ".[dev]"
python -m pytest -q

Provenance

Extracted from SpectraSynq/K1.hardware after the repository transfer to the SpectraSynq organisation.

• Source commit: 002fc9770c6211a752dfb50c43802c245c7e69

• Source file: mcp/mcp-nexar/server.py

• Source SHA-256: cbb668253d78fa2e01e6ccf87ee2e7bee56555644e583c91239bad757ae7ce94

Part of the SpectraSynq toolchain

• K1.hardware - flagship KiCad and hardware automation repository.

• mcp-lcsc - LCSC OpenAPI component lookup.

• mcp-kicad-cli - KiCad CLI automation through MCP.

License

Apache-2.0 - see LICENSE.