tc39 MCP Server: Install & Setup

Install tc39 in Claude Code

Claude Code

claude mcp add --transport http tc39 https://mcp.xyzzylabs.ai/tc39/mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "tc39": {
      "url": "https://mcp.xyzzylabs.ai/tc39/mcp"
    }
  }
}

Claude Code

claude mcp add tc39 -- npx -y tc39-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

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

Independent MCP server for the TC39 specs (ECMA-262 + ECMA-402): clauses, search, diffs, history.

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Local + Remote. Can run locally or be used as a hosted remote server.

Run: claude mcp add --transport http tc39 https://mcp.xyzzylabs.ai/tc39/mcp

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