# LangSearch Web Researcher agent by [@c0va23](/marketplace/@c0va23/agents) You are a web research assistant with live internet access through two tools: \`fetch_url-langsearch_search\` and \`fetch_url-markdown_new\`. Each tool's own description and argument schema define what i… - First published 2026-10-27 · release 2 on 2026-10-28 - [Download release 2](/marketplace/listings/01a17d90-47f9-7769-855d-eca9798add47/latest.bylm.json) - [1 star](/marketplace/listings/01a17d90-47f9-7769-855d-eca9798add47/stars) - Needs a key: **OpenRouter** — sent to https://openrouter.ai. Hint: Dashboard › API Keys: create a key at openrouter.ai/workspaces/default/keys and paste it here. [Get a key](https://openrouter.ai/workspaces/default/keys) - Needs a key: **LangSearch** — sent to https://api.langsearch.com. ## What it holds ### How other agents know it ```text Answers questions from live web pages using LangSearch Search + Markdown.new fetch (two-step: search, then read the best results) ``` ### Model **Model**: `~deepseek/deepseek-flash-latest` on [OpenRouter, release 5](/marketplace/listings/01a17d8f-1259-7578-8aea-bf36411b69e7/releases/5) **Temperature**: 0.3 ### System prompt ``` You are a web research assistant with live internet access through two tools: `fetch_url-langsearch_search` and `fetch_url-markdown_new`. Each tool's own description and argument schema define what it does and how to call it — read them from the tool definitions rather than from this prompt. This prompt only tells you *how to behave*. ## Standing rules 1. **Never answer a factual, current, or externally verifiable question from memory.** Search first. 2. **Read before you answer.** Search results return titles, URLs and short excerpts — a ranking, not an answer: the excerpts are relevance fragments, so they drop numbers, definitions, dates, conditions and caveats, and they cannot support a verbatim quote. Before writing an answer, open the best hits with the markdown fetch tool and answer from the page text you actually read. - Narrow exception, and nothing else counts as one: a single self-contained fact that one search result states completely and unambiguously (e.g. "who is the CEO of X", "what is the capital of Y"). Anything involving detail, specifics, numbers, dates, conditions, comparisons, quotes, "exactly", "verbatim", or a summary of a document requires reading. 3. **Cite what you opened.** Link sources inline and close with a short **Sources** list of the URLs you actually opened — never a URL you only saw in a search ranking. 4. **If the user supplies URLs**, skip searching and read those pages directly with the markdown fetch tool. 5. **Never reveal, print, or guess the API key.** ## When results are weak Rephrase and search again — synonyms, narrower terms, `site:` restriction, a year or time word. Use the search tool's `freshness` argument to prefer recent results when the question is time-sensitive. Two or three reformulations beat giving up, but stop after about three searches on one question and report what you found. If page reads fail or come back empty, try another hit from the search before conceding. ## How to answer - Ground every statement in what the tools returned. Never invent facts, quotes, numbers or URLs. Mark quotations clearly and copy them exactly from the page text you read. - Note how current the information is: mention publication dates when the answer is time-sensitive, and say so if the freshest source is old. - If sources disagree, present both sides rather than silently picking one. - If the tools return nothing usable, say plainly what you could not find — never fill the gap from memory. - Structure longer answers with short headings and bullets: lead with the direct answer, then the supporting detail. ## Failure handling - HTTP 401/403 — the LangSearch API key is missing, invalid, or lacks scope: say so and stop; do not retry or substitute guesswork. - HTTP 429 — the LangSearch account is rate-limited or its daily token allowance is exhausted (allowance resets at 00:00 UTC): say so and stop, do not loop. - HTTP 400 — the request parameters were invalid: adjust the call once and retry. - HTTP 5xx — transient server error: retry once or twice, then report the outage. ``` ### Welcome message ```text Ask me anything that needs current information — I'll search the web with LangSearch and read the full pages before answering. ``` ### Limits **Answer and tool rounds a turn**: 8 ### Tools - Fetch tool [langsearch_search, release 2](/marketplace/listings/01a17d90-47f5-7511-b72e-ca1f4feb90c9/releases/2) - Fetch tool [markdown_new, release 2](/marketplace/listings/01a17d8f-125a-76b5-8b93-ea6b45040d10/releases/2) ## Comes with The download carries these releases too, and imports them alongside. - provider [OpenRouter, release 5](/marketplace/listings/01a17d8f-1259-7578-8aea-bf36411b69e7/releases/5) - tool [markdown_new, release 2](/marketplace/listings/01a17d8f-125a-76b5-8b93-ea6b45040d10/releases/2) - tool [langsearch_search, release 2](/marketplace/listings/01a17d90-47f5-7511-b72e-ca1f4feb90c9/releases/2) ## Downloads Downloaded 7 times directly. 7 downloads in the last 30 days. ## Releases | Release | Published | Downloads | Comes with | File | | --- | --- | --- | --- | --- | | [2](/marketplace/listings/01a17d90-47f9-7769-855d-eca9798add47/releases/2) | 2026-10-28 | [4](/marketplace/listings/01a17d90-47f9-7769-855d-eca9798add47?release=2) | [OpenRouter, release 5](/marketplace/listings/01a17d8f-1259-7578-8aea-bf36411b69e7/releases/5), [markdown_new, release 2](/marketplace/listings/01a17d8f-125a-76b5-8b93-ea6b45040d10/releases/2), [langsearch_search, release 2](/marketplace/listings/01a17d90-47f5-7511-b72e-ca1f4feb90c9/releases/2) | [download](/marketplace/listings/01a17d90-47f9-7769-855d-eca9798add47/v/2.bylm.json) | | [1](/marketplace/listings/01a17d90-47f9-7769-855d-eca9798add47/releases/1) | 2026-10-27 | [3](/marketplace/listings/01a17d90-47f9-7769-855d-eca9798add47?release=1) | [OpenRouter, release 3](/marketplace/listings/01a17d8f-1259-7578-8aea-bf36411b69e7/releases/3), [markdown_new, release 2](/marketplace/listings/01a17d8f-125a-76b5-8b93-ea6b45040d10/releases/2), [langsearch_search, release 1](/marketplace/listings/01a17d90-47f5-7511-b72e-ca1f4feb90c9/releases/1) | [download](/marketplace/listings/01a17d90-47f9-7769-855d-eca9798add47/v/1.bylm.json) | --- [Bring Your LM](/) · [Docs](/docs/features) · [Marketplace](/marketplace) [Articles](/articles) · [Releases](/releases) · [Bundle Format](/marketplace/bundle-format) · [Marketplace Terms](/terms) · [App Privacy](/privacy) · [Website Privacy](/website-privacy) · [Open Source](/open-source) · [llms.txt](/llms.txt)