OpenAI Sites: Building Personalized, Agent-Friendly Web Apps from a Single Prompt

Katia from the Developer Experience team and John, lead engineer for Sites, demonstrate how OpenAI Sites turns spreadsheets and documents into full-stack web apps. The session covers the full workflow: generating a site from a single prompt, keeping it fresh with plugins and scheduled tasks, adding sign-in and per-user data, and making sites usable by both people and agents.

■ Building a Site
- Turning a spreadsheet into an interactive launch tracker with Codex
- Keeping the site updated automatically with plugins and scheduled tasks
- Built-in auth via Sign-in with ChatGPT and private-by-default access

■ Collaboration and Personalization
- Bringing teammates' own plugin data (Drive, Slack, Linear) into a shared site
- Editing permissions, invitations, and write-back to external services
- Custom annotations in the in-app browser for easier site editing

■ Agent-Friendly Sites
- Using environment variables and APIs in a Sites app
- WebMCP tools that let agents act on a live app instead of clicking through the UI
- Agent-driven personalization based on user context

This is aimed at developers, product managers, designers, and anyone building internal tools or public-facing web apps. Viewers will learn what Sites supports out of the box and how to structure apps so both teammates and agents can interact with them efficiently.