@bradford-tech/mouser-mcp

An MCP server for the Mouser Electronics API: part search, BOM review, carts, order history and — opt-in — orders that are only placed after you type APPROVE into a confirmation prompt shown by the server. Built on @bradford-tech/mouser-sdk.

It runs locally over stdio with your own Mouser API keys. Works with Claude Code and Claude Desktop.

Install

You need a Mouser Search API key, and for carts, order history and ordering an Order API key. Request both from the Mouser API hub.

Claude Code:

claude mcp add mouser \
  --env MOUSER_SEARCH_API_KEY=your-search-key \
  --env MOUSER_ORDER_API_KEY=your-order-key \
  -- npx -y @bradford-tech/mouser-mcp

Claude Desktop: download mouser-<version>.mcpb from the latest release and open it. Desktop asks for the keys in its settings and stores them securely. Or add this to claude_desktop_config.json:

{
  "mcpServers": {
    "mouser": {
      "command": "npx",
      "args": ["-y", "@bradford-tech/mouser-mcp"],
      "env": {
        "MOUSER_SEARCH_API_KEY": "your-search-key",
        "MOUSER_ORDER_API_KEY": "your-order-key"
      }
    }
  }
}

Configuration

Requires Node 20 or newer.

Related MCP server: mouser-search-mcp

Tools

Things to know:

• No parametric search. Mouser can't filter or sort by specifications (capacitance, voltage, price). Search by keyword; Claude filters the returned descriptions.

• Price breaks. Mouser returns a handful of price breaks per part; quantities above the last break are priced at that break, not extrapolated.

• Search results are lighter than lookups. search_parts leaves out links, on-order dates and compliance codes to keep pages small; get_parts returns them.

• Dates are returned as Mouser sends them (e.g. 2026-11-06T00:00:00, no timezone).

• Rate limits. Mouser allows 30 calls a minute and 1,000 a day. The server queues calls to stay under the per-minute limit (a 200-line BOM takes about a minute) and says so plainly when the daily limit is reached.

Placing orders

Ordering is off unless MOUSER_ENABLE_ORDERS=1. When on:

1. Claude builds a cart, then calls preview_order. Mouser prices the order (lines, tax, shipping, total) without placing it. The preview is kept in memory for 20 minutes and can be submitted once.

2. submit_order takes only the preview's ID. The server checks the cart hasn't changed, fetches fresh figures from Mouser, and shows its own confirmation prompt with the total. If the total changed since the preview, the prompt says so.

3. The order is placed only if you type APPROVE into that prompt (any case; quotes and surrounding spaces are fine). Anything else — APPROV, yes, cancelling the prompt — cancels it, and that preview can't be used again.

Claude never sees or relays the confirmation word, so it can't approve an order on your behalf. The final charge is Mouser's figure at the moment of submission.

The confirmation prompt needs a client that supports MCP elicitation: Claude Code in interactive mode does; Claude Desktop and non-interactive runs (claude -p, the Agent SDK) don't yet, and submit_order refuses there without contacting Mouser. You can still build carts in any client and check out on mouser.com.

First live order (maintainers)

Order placement ships off by default until it has been verified against the live API:

1. In interactive Claude Code with MOUSER_ENABLE_ORDERS=1, build a cart with one low-value part and call preview_order. Check the cart on mouser.com is unchanged and no order exists.

2. Call submit_order. Confirm the prompt appears, shows the total, and that typing APPROV cancels it.

3. Preview again, submit, type APPROVE. Confirm the order number matches mouser.com.

4. Call submit_order again with the same preview ID and confirm it's refused.

Development

git clone https://github.com/bradford-tech/mouser-mcp.git
cd mouser-mcp
npm install
npm test

npm run build        # compile to dist/
npm run fix          # prettier + eslint auto-fix, then type-check
npm run live-check   # read-only calls against the real API (keys from a local .env)
bash scripts/pack-mcpb.sh   # build the Claude Desktop bundle (after npm run build)

License

MIT