### [DevTools for agents](devtools-for-agents)

DevTools for agents 1.4 and later bring new experimental memory debugging tools,
experimental TOON support for structured content output, and improved skill discovery.

### [AI assistance](ai-assistance)

The agent walkthrough in the updated AI assistance panel now renders rich widgets
for performance network tracks, timeline event summaries, network requests,
syntax-highlighted source code, and inspected file lists.

### [`@container` and `@function`](css-container-function)

You can now directly edit `@container` and `@function`
rules within the Styles tab, allowing for seamless experimentation.