What is the key difference between Emailens MCP and Agent Toolbelt?

Emailens MCP belongs to the Communication category with local stdio execution, while Agent Toolbelt belongs to the Communication category with local stdio execution.

How do I install Emailens MCP or Agent Toolbelt 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 Emailens MCP and Agent Toolbelt free or paid?

Emailens MCP operates under a Freemium model (API Key required). Agent Toolbelt operates under a Freemium model (API Key required).

Which MCP server has more tools and community activity?

Emailens MCP lists 9 tools with 3 views and 7 GitHub stars. Agent Toolbelt lists 6 tools with 3 views and 1 GitHub stars.

Can I use both Emailens MCP and Agent Toolbelt 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

Emailens MCP vs Agent Toolbelt

In-depth architectural comparison of the Emailens MCP and Agent Toolbelt 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

Emailens MCP

Communication · Local stdio

Quality: 65/100 (Great) | Auth: API Key required

Agent Toolbelt

Communication · Local stdio

Quality: 53/100 (Good) | Auth: API Key required

Verdict Summary: Choose Emailens MCP if you need specialized Communication tools running via a local process. Choose Agent Toolbelt 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 Emailens MCP when:

You need dedicated capabilities in the Communication domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (Freemium).
You have access to required keys: EMAILENS_API_KEY.
Primary tools included: preview_email, analyze_email, audit_email.

Explore Emailens MCP Details

Choose Agent Toolbelt when:

You need dedicated capabilities in the Communication domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (Freemium).
You have access to required keys: AGENT_TOOLBELT_KEY.
Primary tools included: Seven synthesized stock research tools, Twenty agent utility tools, Live financial data with source status.

Feature & Specification Comparison

Specification	Emailens MCP emailens Communication	Agent Toolbelt marras0914 Communication
Summary	Official MCP server for Emailens, the rendering linter for email. Lint HTML email for rendering issues across 15 clients (Gmail, Outlook, Apple Mail and more), score CSS compatibility 0-100 per client, simulate dark mode, and get framework-native fix snippets for React Email, MJML, and Maizzle. npx -y @emailens/mcp	20 focused API tools for AI agents: schema generation, text extraction, token counting, regex/cron building, prompt optimization, web summarization, document comparison, and more. TypeScript SDK + LangChain wrappers included.
Category & Scope

Tools & Capabilities Breakdown

Emailens MCP Tools (9)

preview_email

Full email compatibility preview, transforms HTML for 21 email clients (Gmail, Outlook, Apple Mail, Yahoo, Samsung, Thunderbird, HEY, Proton Mail, AOL, Fastmail, Superhuman), analyzes CSS, generates scores, simulates dark mode, checks inbox preview and email size.

analyze_email

Quick CSS compatibility analysis, returns per-client scores and one finding per problem, listing the clients it affects. For HTML input each finding carries loc (line, column, offset) and alsoAtLines, so you can edit the exact source. Narrow with clients, or pass detail:'full' for the per-client breakdown with fix snippets. Use audit_email for a full quality report (spam, links, a11y, images, etc.).

audit_email

Comprehensive email quality audit: CSS compatibility, spam scoring, link validation, accessibility, images, inbox preview, size (Gmail clipping), template variables, content overflow, visual fallbacks, dark-mode and mobile text contrast, design consistency, and structural faults in Outlook-only VML (which lives inside conditional comments and is invisible to every other check). For HTML input, findings tied to a specific element carry loc (line, column, offset) so you can edit the exact source. Compatibility is collapsed to one finding per problem listing the clients it affects; pass detail:'full' for the per-client breakdown with fix snippets. Use skip to omit checks and clients to narrow which clients are reported.

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).

Emailens MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "emailens-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@emailens/mcp"
      ],
      "env": {
        "EMAILENS_API_KEY": "YOUR_EMAILENS_API_KEY_HERE"
      }
    }
  }
}

Agent Toolbelt Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "marras0914-agent-toolbelt": {
      "command": "npx",
      "args": [
        "-y",
        "@getcordon/cli"
      ],
      "env": {
        "AGENT_TOOLBELT_KEY": "YOUR_AGENT_TOOLBELT_KEY_HERE"
      }
    }
  }
}

Frequently Asked Questions

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

More alternatives to Emailens MCP More alternatives to Agent Toolbelt Communication category hub