Fetches content from a specified URL and converts HTML to markdown for readability.
Use this tool when you need to retrieve and analyze web content.

- Prefer a more specialized tool over `web_fetch` when one is available.
- URLs must be valid.
- Read-only: does not modify any files.
- Content is capped at a byte limit. If `was_truncated` is true, the page had more content that was cut off.
