HeyClaude — Claude & AI workflow directory vs Tc39 MCP

In-depth architectural comparison of the HeyClaude — Claude & AI workflow directory and Tc39 MCP 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 HeyClaude — Claude & AI workflow directory 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 HeyClaude — Claude & AI workflow directory Details

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

Feature & Specification Comparison

Specification	HeyClaude — Claude & AI workflow directory Developer Tools	Tc39 MCP Developer Tools
Summary	Search the HeyClaude directory of Claude Code agents, MCP servers, skills, and tools.	Structural TC39 spec lookup (ECMA-262 + ECMA-402) for AI agents — SHA-pinned, offline-first.
Category & Scope	Developer Tools	Developer Tools

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": {
    "heyclaude-claude-ai-workflow-directory": {
      "command": "uvx",
      "args": [
        "packages"
      ]
    }
  }
}

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

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