Webclaw

webclaw

Web extraction for AI agents, powered by a local Rust engine. It turns any URL into clean Markdown, text, or JSON through the webclaw MCP server, and it works with no API key.

Install

npx create-webclaw

This writes the npx @webclaw/mcp MCP config into your agent (Claude Code, Cursor, Windsurf, Codex, Antigravity, and more) — nothing to install; the server is fetched and cached on first launch. Restart the agent to load the tools below.

• No key needed. Extraction runs on your machine: free, private, and unlimited for the common case. Static sites, docs, blogs, server-rendered pages, and product pages all work locally.
• Optional upgrade. Set WEBCLAW_API_KEY (from https://webclaw.io) and webclaw escalates to the hosted engine for the pages local extraction can't finish: bot-protected sites and JavaScript-rendered SPAs. Without a key, those pages return a clear message that tells you how to unlock them.

When to use this skill

• You need reliable web content with clean, structured output.
• web_fetch returns empty, truncated, or blocked content.
• You need structured data (pricing tables, product specs, contact info) as JSON.
• You need to crawl a whole site or discover every URL.
• You need LLM-optimized content, cleaner than raw markdown.
• You need a site-specific extractor (GitHub, Reddit, YouTube, npm, PyPI, Amazon).
• You need to summarize, diff, or search the web.
• You need to enrich a company URL — or a list of them — into outreach-ready leads: founders/leadership with their LinkedIn and X, plus summary, socials, pricing, tech, and on-site emails.

Tools

All tools run locally with no key unless noted. Output formats: markdown (default), text, llm (adds a title and URL header with clean link references, best for feeding to a model), and json (full metadata).

scrape: extract a single URL

url (required), format, include_selectors, exclude_selectors, only_main_content, browser (chrome | firefox | random), cookies. YouTube watch, shorts, and youtu.be URLs also return a transcript and a video-metadata block alongside the content.

crawl: scrape an entire site

url, depth (default 2), max_pages (default 50), concurrency (default 5), use_sitemap, format.

map: discover URLs

url. Sitemap-first discovery, with a bounded same-origin crawl fallback when the sitemap is thin.

batch: many URLs in parallel

urls (array), format, concurrency (default 5).

extract: structured data via LLM

url, plus either prompt (natural language) or schema (a JSON schema). See LLM setup below.

summarize: quick summary

url, max_sentences (default 3). See LLM setup below.

diff: detect content changes

url, previous_snapshot (a prior extraction as JSON). Compares at the extracted-content level rather than raw HTML.

brand: visual identity

url. Returns colors, fonts, logo, and favicon.

search: web search

query, num_results (≤10), country, lang, scrape (also fetch and extract each result page). Uses your own SERPER_API_KEY (free at serper.dev) locally, and falls back to the hosted API when unset.

vertical_scrape: typed JSON for a specific site

name (extractor name), url. Returns typed fields (title, price, author, rating) instead of generic markdown, or a clear "URL mismatch" error when the URL doesn't fit the extractor. Verticals for protected sites (Amazon, eBay, Etsy, Trustpilot) need WEBCLAW_API_KEY; without one they return a message asking you to set it.

list_extractors: list all 28 site extractors

No params. Returns each extractor's name and URL shape: reddit, hackernews, github_repo, github_pr, github_issue, github_release, pypi, npm, crates_io, huggingface_model, huggingface_dataset, arxiv, docker_hub, dev_to, stackoverflow, substack_post, youtube_video, linkedin_post, instagram_post, instagram_profile, shopify_product, shopify_collection, ecommerce_product, woocommerce_product, amazon_product, ebay_listing, etsy_listing, trustpilot_reviews.

research: deep multi-source research (requires WEBCLAW_API_KEY)

query, deep, topic. Runs a search, read, and synthesize loop on the hosted engine and returns a cited report.

lead: turn one company URL into an outreach-ready lead (requires WEBCLAW_API_KEY)

url (required), no_cache (default false). Enriches a single company. The response is url, domain, people_source (web_search), cache (hit | miss), and credits (100) at the top level, plus a nested lead object that holds everything about the company: company_name, summary, socials (linkedin, x, github), tech, pricing tiers (plan, price), on-site emails (type, email), and people — the founders/leadership as name, role, linkedin, x. The people come from open-web search + verification (anchored to the company's own domain, name-validated), not a licensed contact database. Does not return funding, HQ, phone, or guessed emails. Very new sites and solo founders may return fewer people, or none. Flat 100 credits per successful lead; a site that can't be reached and has no public people isn't charged.

lead_batch: enrich many company URLs in one call (requires WEBCLAW_API_KEY)

urls (array, 1–25 companies), no_cache (default false). Runs lead across the whole list. The job is async on the server, but this tool polls internally and blocks until it finishes, then returns the final job: id, status (completed), total, completed, succeeded, credits_charged, and results — one entry per URL, either { url, status: "success", domain, lead, cache } (same nested lead object as above) or { url, status: "error", error }. Billed 100 credits per successful lead; URLs that can't be enriched (unreachable, nothing found) aren't charged. Up to 25 URLs per call. To discover the companies to feed it, pair with the lead-enrichment skill's find.py.

Which tools need a key?

LLM setup (for extract and summarize)

These two tools use an LLM provider chain: local Ollama first (free and private; install from ollama.com), then your own OPENAI_API_KEY, GEMINI_API_KEY, or ANTHROPIC_API_KEY if set. No webclaw key needed.

Tips

• For GitHub, Reddit, YouTube, npm, PyPI, or Amazon, use vertical_scrape (or plain scrape, which auto-detects most verticals) to get typed fields in one call.
• Set only_main_content: true to strip navigation, sidebars, and footers.
• Use the llm format when passing content to a model.
• Run map before crawl to scope a site, then crawl the section you need.
• If a page is bot-protected or JS-only, set WEBCLAW_API_KEY to escalate; without one you get a clear note that the page needs it.

vs web_fetch

Use web_fetch for a quick one-off lookup. Reach for webclaw when you need reliability, clean structure, structured data, or whole-site coverage.