Search the public web. DuckDuckGo is tried first when reachable; Bing is the fallback.

Chinese queries / zh-* markets use cn.bing.com. Read quality_label: poor means the titles are unrelated or first-token junk — do not treat them as answers.

Args: query: Compact concrete nouns plus the qualifier that uniquely identifies the subject. "复旦光华楼" is better than "光华楼" — the extra place/institution is necessary, not padding. Do not write whole sentences. If a compact query is still ambiguous or hits the wrong entity, write more (place, institution, year, type). For a person plus a paper, search the author name first. count: Number of organic results to return, from 1 to 20. offset: Result offset for pagination, from 0 to 100. market: Locale such as en-US or zh-CN. Chinese text should use zh-CN. safe_search: SafeSearch level (used when Bing is the engine).

Search image indexes and rank results with pure text so vision is not required.

auto (default) tries Bing Images first and falls back to Wikimedia Commons when the top text score is below ~40, so one call yields a ranked set. bing_images parses Bing Images metadata (original URL / thumbnail / source page / title). commons queries Wikimedia Commons, a curated and licence-clear platform. Every result carries a 0-100 text score, a domain hint and explainable signals; pick the highest score, treat scores below ~40 as unverified, and optionally verify with find/open on the source page before downloading.

Args: query: What the image should depict. Compact concrete nouns plus the qualifier that uniquely identifies the subject (e.g. "复旦光华楼", "台州城墙"). "复旦光华楼" is better than "光华楼". Do not write whole sentences. If a compact query is still ambiguous or hits the wrong entity, write more (place, institution, year, type). count: Number of ranked image results to return, from 1 to 20. market: Locale such as en-US or zh-CN (Bing Images; Commons is language-neutral). provider: auto (default), bing_images, or commons.

Fetch a public HTTP(S) page with curl_cffi and return cleaned readable text.

Use after search when result snippets are insufficient. Private/local addresses are rejected, redirect targets use curl_cffi safe-follow mode, and response bytes are capped.

Find a literal phrase in a page and return compact context windows around matches.