Onepassword Agent MCP vs Phantom Secrets

In-depth architectural comparison of the Onepassword Agent MCP and Phantom Secrets MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Onepassword Agent MCP when:

• You need dedicated capabilities in the Security domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Onepassword Agent MCP Details

Choose Phantom Secrets when:

• You need dedicated capabilities in the Security domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Phantom Secrets Details

Feature & Specification Comparison

Specification	Onepassword Agent MCP Security	Phantom Secrets Security
Summary	Local MCP access to approved 1Password fields without exposing plaintext secrets to AI agents.	Stop AI coding agents from leaking API keys. Local proxy swaps real secrets for phm_ tokens.
Category & Scope	Security	Security

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "onepassword-agent-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "onepassword-agent-mcp"
      ]
    }
  }
}

{
  "mcpServers": {
    "phantom-secrets": {
      "url": "https://phm.dev/og-image.png"
    }
  }
}

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