We also wired the Chrome DevTools Protocol into the agent runtime and created skills for working with DOM snapshots, screenshots, and navigation. This enabled Codex to reproduce bugs, validate fixes, and reason about UI behavior directly.
...
Hmm... I wonder what "wired the Chrome DevTools Protocol into the agent runtime" means? Sounds more direct than an model context protocol - MCP or agent skill. They did create skills, but those are separate: agent skill -- browser -- work with DOM snapshots, agent skill -- browser -- work with screenshots, agent skill -- browser -- navigation