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Show HN: Jevcrawl – A web crawler for AI agents with no LLM in the crawl loop

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Screenshot of Show HN: Jevcrawl – A web crawler for AI agents with no LLM in the crawl loop

A lightweight MCP server and CLI that crawls websites for AI agents by using a small decision model to score every link and passage so the agent's LLM only reads material that likely answers its question. It fetches pages (four at a time), segments them into passages, filters boilerplate, and issues one Jev scoring request per page that returns yes/no probabilities; all returned text is copied verbatim with URL, heading path and character offsets. The design emphasizes low cost, speed and safety: decisions cost cents per crawl, caching avoids repeat charges, the scorer cannot write text (reducing hallucination and prompt-injection risk), and integrations exist for MCP clients like Claude Code, Claude Desktop and Cursor. Tools include crawl, scrape and map; the project is Python, Apache-2.0 licensed and configurable via a Typesafe API key. It does not run JavaScript.

Benchmarks show substantial cost and speed advantages: an example crawl of docs.python.org reduced ~80,034 tokens to 1,873 for $0.0069 in 8.3s. On 50 WebWalkerQA tasks it answered 40% and fetched the answer page 54% for $0.025 per task versus 30%/33%/$0.194 when an LLM chose links and 8%/11%/$0.228 for breadth-first. Versus Crawl4AI on 20 tasks it fetched 10 versus 5 answer pages, median crawl time 29s versus 43s, and had fewer site-load failures; cost-per-correct-answer comparisons favor Jevcrawl ($0.06 vs $0.65 and $2.85). Results note small sample sizes and that Crawl4AI drives full browsers while Jevcrawl omits JS.

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