Datasette-apps 0.2a0 Released with Hidden Iframe Testing for AI Agents

Simon Willison has released datasette-apps 0.2a0, introducing new tools that allow AI agents to list, edit, and test hosted applications. Specifically, it adds the `app_debug()` tool for invisible testing and the `app_list()` tool for listing editable apps. This release enables AI agents to perform automated smoke testing and UI measurements on web applications within a sandboxed environment. It highlights a growing trend of LLM-powered agents interacting directly with and verifying the code they generate or edit. The `app_debug()` tool runs agent-provided JavaScript inside a sandboxed, invisible iframe using `opacity: 0` and `pointer-events: none`. This functionality relies on the `context.browser_task()` mechanism introduced in datasette-agent 0.4a0.