Web search through a configurable provider chain with automatic failover. Two modes: mode="failover" (default) walks the chain one provider at a time and returns the first success (including an empty answer); mode="fanout" queries up to UWR_SEARCH_FANOUT providers concurrently, then merges and rank-fuses the results (even an all-empty set of OK answers succeeds with results: []; provider="fanout", every row carries sources; costs N× provider quota per search). Default chain: AnySearch -> Tavily -> DDGS; operators can reorder/extend it with UWR_SEARCH_CHAIN (e.g. anysearch,tavily,yuanbao,bocha,deepseek,kimi,ddgs) and pick the default mode with UWR_SEARCH_MODE. Auth is automatic: a configured API key enables keyed mode, otherwise the provider's official keyless access is used. Returns JSON: {success, provider, mode, latency_ms, attempts, results: [{title, url, snippet, published?, site?, sources?}]}. providers overrides the chain order for this one call (e.g. ["bocha"] or ["yuanbao","tavily"]); in fanout mode its first N eligible entries are queried.

Fetch one URL's page content as Markdown with automatic provider failover (default: AnySearch -> Tavily -> DDGS.extract; operators can reorder the chain with UWR_FETCH_CHAIN). Auth is automatic (keyed when a key is configured, else official keyless). Accepts a single url string, or urls array (max 5) for batch. providers overrides the chain order for this call. Returns JSON array of {url, content, title, content_type, provider, mode, latency_ms, attempts} — failed URLs carry an error field instead. Note: JS-rendered, login-walled or CAPTCHA-protected pages are not guaranteed.

List every provider this server knows: capabilities (search/fetch), whether it is usable right now (configured / key present), whether it is enabled, and its 1-based position in each active chain. Also reports the active search mode (failover/fanout) and the fan-out fan width/grace. Never returns key values. Use it to decide what to pass in web_search/web_fetch providers.