op-mcp

A lightweight MCP server for 1Password that wraps the op CLI. Zero idle CPU usage.

Why?

The popular @takescake/1password-mcp uses the @1password/sdk WASM runtime, which burns 40-80% CPU even when idle due to an internal event loop in the compiled Rust/WASM binary. This server shells out to the op CLI instead — it does nothing when idle and only spawns a process when a tool is called.

Supports service account tokens for headless/CI use (no biometric auth required).

Related MCP server: proton-pass-community-mcp

Install

npx @jrejaud/op-mcp

Or install locally:

git clone https://github.com/studio-corsair/op-mcp.git
cd op-mcp
npm install && npm run build
node dist/index.js

Prerequisites

• 1Password CLI (op) installed

• A service account token or signed-in op session

Configuration

Claude Code

{
  "mcpServers": {
    "1password": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "op-mcp"],
      "env": {
        "OP_SERVICE_ACCOUNT_TOKEN": "your-token-here"
      }
    }
  }
}

Environment Variables

Tools

License

MIT