Fetch a web page and return its content as clean, LLM-ready Markdown. Full content by default (no truncation). Handles HTML, plain text, Markdown, and JSON responses. JavaScript-heavy pages are rendered automatically in a real browser when the static HTML is an empty SPA shell. Returns an honest typed error when the site blocks access or the content cannot be read — it never silently returns partial or fake content.

Fetch a documentation or reference page and return only its main content as clean Markdown, stripping navigation sidebars, headers, footers, and other page chrome. Use this for API docs, guides, and reference pages. For general web pages use read_url. Same JS-rendering, anti-bot, and honest-error behavior as read_url.