Both runners leave the start together, carrying the same idea for a custom chart. The finish line is a published viz on Tableau. For the first three steps they share a road: describe it, the agent builds it, check the numbers. Then the Data App turns for the finish, and the extension heads out for the .trex manifest, hosting, HTTPS, the safelist and the rest.
You need a Tableau Cloud site and a Creator or Explorer (can publish) role, with permission to publish to a project. Your Personal Space works for a first try.
A site admin has to switch on the site’s Packages setting. Without it, the agent can’t scaffold a Data App and you’ll get a 403.
Add the Tableau MCP connector and the Tableau plugin to your agent. The plugin carries the Data App skill: scaffold, package and publish.
Name the data, a published data source or a file you hand over, and say what you want to see. Plain words are enough.
It scaffolds the app, writes the code, packs everything into one workbook and publishes it to your Personal Space.
Open the view, compare it against the source and ask for fixes. When it’s right, move the workbook into a shared project.