Fetch and read the content of a web page, returning its text. Use when a `web_search` result looks relevant and you need the full context, when {{user}} pastes or mentions a URL you should actually read, or when you want to follow a specific page you already have in mind. Best paired with `web_search` to find candidate URLs first. Returns plain text; complex interactive pages, paywalled content, or heavily JS-rendered sites may return limited or no content.
