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Try this:

Option A (easiest): Use a different Retell MCP server package

There’s an actively published alternative npm package: @jesec/retellai-mcp-server.  

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In Claude Desktop → Settings → Developer → Edit Config, swap your MCP server entry to:

{
  "mcpServers": {
    "retell": {
      "command": "npx",
      "args": ["-y", "@jesec/retellai-mcp-server"],
      "env": {
        "RETELL_API_KEY": "YOUR_RETELL_KEY_HERE"
      }
    }
  }
}