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ChatGPT can talk to htmldrop through a custom MCP connector. Connectors cannot be installed from inside a chat — that is deliberate on OpenAI’s side, since it is exactly what a prompt-injection attack would try — so you add it once in settings.
1

Turn on developer mode

Settings → Apps → Advanced and enable Developer mode. On Business and Enterprise workspaces an admin may need to permit custom connectors first.
2

Create the connector

Settings → Connectors → Create, then enter:
Give it a name and a description — the model reads the description when deciding whether to use it, so something like “Publishes HTML or Markdown to a live URL” works well.
3

Approve the sign-in

The first publish opens a browser window for OAuth. Approve once; ChatGPT holds and refreshes the token from then on.

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Using it

Make me a one-page portfolio and publish it with htmldrop
ChatGPT writes the HTML, calls htmldrop_publish, and hands back the live URL.

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Without a connector

If you would rather not add one, ask ChatGPT for a single self-contained HTML file, download it, and drag it onto htmldrop.app. Same result, one extra step.