MCP Servers

op-mcp

Enables interaction with 1Password vaults and items via the op CLI, supporting vault listing, item lookup, password read/create/update/generate, and delete operations. Zero idle CPU usage and supports service account tokens for headless use.

Category

README

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).

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

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

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