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jrejaud

op-mcp

by jrejaud
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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

Configuration

Claude Code

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

Environment Variables

Variable

Required

Description

OP_SERVICE_ACCOUNT_TOKEN

Recommended

Service account token (skips biometric)

OP_PATH

No

Path to op binary (default: /opt/homebrew/bin/op)

Tools

Tool

Description

vault_list

List all accessible vaults

item_lookup

Search items by name, URL, or tag

password_read

Read a field via op:// reference or get full item

password_create

Create a new login/password/note item

password_update

Update fields on an existing item

password_generate

Generate a random password

item_delete

Delete or archive an item

License

MIT

This server cannot be deployed

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Maintenance

ActivityInactive
ResponsivenessNo issues

Resources

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