What is the key difference between Agent Cold Email and Hackle?

Agent Cold Email belongs to the Communication category with local stdio execution, while Hackle belongs to the Communication category with local stdio execution.

How do I install Agent Cold Email or Hackle in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Agent Cold Email and Hackle free or paid?

Agent Cold Email operates under a Free / Open Source model (No auth required). Hackle operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Agent Cold Email lists 0 tools with 0 views and 1 GitHub stars. Hackle lists 0 tools with 0 views and 3 GitHub stars.

Can I use both Agent Cold Email and Hackle together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Agent Cold Email vs Hackle

In-depth architectural comparison of the Agent Cold Email and Hackle 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.

At a Glance & Executive Verdict

Agent Cold Email

Communication · Local stdio

Quality: 45/100 (Fair) | Auth: No auth required

Hackle

Communication · Local stdio

Quality: 37/100 (Fair) | Auth: No auth required

Verdict Summary: Choose Agent Cold Email if you need specialized Communication tools running via a local process. Choose Hackle if your workspace requires Communication integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Agent Cold Email when:

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

Explore Agent Cold Email Details

Choose Hackle when:

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

Explore Hackle Details

Feature & Specification Comparison

Specification	Agent Cold Email Communication	Hackle Communication
Summary	Agent-native cold-email infrastructure: domains, mailboxes, warmup, sequences, replies via 17 tools	Remote MCP server for the Hackle Admin API: experiments, feature flags, remote config, messaging.
Category & Scope	Communication	Communication
Quality signal

Tools & Capabilities Breakdown

Agent Cold Email Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

Hackle Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

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).

Agent Cold Email Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "agent-cold-email": {
      "command": "npx",
      "args": [
        "-y",
        "skills"
      ]
    }
  }
}

Hackle Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "hackle": {
      "command": "npx",
      "args": [
        "-y",
        "@hackle-io/hackle-mcp@latest"
      ]
    }
  }
}

Frequently Asked Questions

Agent Cold Email is categorized under Communication and uses a local stdio subprocess. In contrast, Hackle belongs to Communication using local stdio subprocess. Select Agent Cold Email when you need capabilities focused on communication and Hackle when you require tools for communication.

More alternatives to Agent Cold Email More alternatives to Hackle Communication category hub