What is the key difference between Tc39 MCP and AgentPhone?

Tc39 MCP belongs to the Developer Tools category with local stdio execution, while AgentPhone belongs to the Developer Tools category with local stdio execution.

How do I install Tc39 MCP or AgentPhone 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 Tc39 MCP and AgentPhone free or paid?

Tc39 MCP operates under a Free / Open Source model (No auth required). AgentPhone operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Tc39 MCP lists 0 tools with 0 views and 2 GitHub stars. AgentPhone lists 0 tools with 0 views and 121 GitHub stars.

Can I use both Tc39 MCP and AgentPhone 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

Tc39 MCP vs AgentPhone

In-depth architectural comparison of the Tc39 MCP and AgentPhone 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

Tc39 MCP

Developer Tools · Local stdio

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

AgentPhone

Developer Tools · Local stdio

Quality: 49/100 (Fair) | Auth: No auth required

Verdict Summary: Choose Tc39 MCP if you need specialized Developer Tools tools running via a local process. Choose AgentPhone if your workspace requires Developer Tools integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Tc39 MCP 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 Tc39 MCP Details

Choose AgentPhone 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 AgentPhone Details

Feature & Specification Comparison

Specification	Tc39 MCP Developer Tools	AgentPhone Developer Tools
Summary	Structural TC39 spec lookup (ECMA-262 + ECMA-402) for AI agents — SHA-pinned, offline-first.	Give AI agents real phone numbers, messages, and voice calls via MCP.
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

Tc39 MCP Tools (0)

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

AgentPhone 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).

Tc39 MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "tc39-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "tc39-mcp"
      ]
    }
  }
}

AgentPhone Configuration

mcpServers (Claude Desktop / Cursor)

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

Frequently Asked Questions

Tc39 MCP is categorized under Developer Tools and uses a local stdio subprocess. In contrast, AgentPhone belongs to Developer Tools using local stdio subprocess. Select Tc39 MCP when you need capabilities focused on developer tools and AgentPhone when you require tools for developer tools.

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