Searches the web using SearXNG and returns a list of results, each with a title, URL, and content snippet. CRITICAL: The required parameter name is exactly query (not prompt, q, or any other name). Calls an external SearXNG instance; availability depends on the SEARXNG_URL configuration. Use pageno to paginate results; combine time_range and language to narrow scope. To read the full text of a result URL, follow up with web_url_read.

Fetches a URL and returns its text content converted to markdown. Three modes: (1) Full content — omit filtering params; use startChar/maxLength to paginate large pages. (2) Section extraction — set section to return content under a specific heading. (3) Headings only — set readHeadings: true to list all headings (mutually exclusive with other filtering params). Returns an error string if the URL is unreachable or content cannot be extracted. Use after searxng_web_search to read the full content of individual result URLs.