Agent Browser vs Countersignatory

In-depth architectural comparison of the Agent Browser and Countersignatory 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?

A

Choose Agent Browser when:

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

Explore Agent Browser Details

Choose Countersignatory when:

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

Explore Countersignatory Details

Feature & Specification Comparison

Specification	A Agent Browser Developer Tools	Countersignatory Developer Tools
Summary	Self-hosted Chrome for AI agents, with a live noVNC view a human can take over.	Live spot prices for verified human judgment, sign-off and notarisation.
Category & Scope	Developer Tools	Developer Tools
Quality signal

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": {
    "agent-browser": {
      "command": "npx",
      "args": [
        "-y",
        "aether-browser"
      ]
    }
  }
}

{
  "mcpServers": {
    "countersignatory-2": {
      "url": "https://countersignatory.com/mcp"
    }
  }
}

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