Zero-dependency webfetch MCP server for DeepSeek Harness and any MCP client: clean text / markdown / raw HTML / JSON, robots.txt compliance, chunked reading, SSRF protection.
View on GitHub ↗A zero-dependency webfetch MCP server: fetches any http(s) URL and returns clean content — text, simplified Markdown, raw HTML, or formatted JSON. Built for DeepSeek Harness (dsh), works with any MCP client that supports stdio servers.
- Zero dependencies: single server.js, hand-rolled stdio JSON-RPC 2.0 — no npm install, no SDK version conflicts. - Model-friendly output: main-content extraction (/), entity decoding, absolute links, image alt text, chunked reading. - Polite & safe: robots.txt compliance, Cloudflare-challenge retry, SSRF protection, bounded 5 MiB reads.
Compared three existing implementations (2026-08) and adopted the useful parts with zero-dependency equivalents:
Source Adopted design ------ Official mcp-server-fetch startIndex chunked reading, robots.txt compliance, raw mode OpenCode tool/webfetch.ts Format-aware Accept headers, Cloudflare challenge → plain-UA retry, 5 MiB bounded reads pi-web-access Main-content-first (lightweight Readability heuristic), SSRF protection, relative-link absolutization, image alt
Deliberately not adopted: @mozilla/readability, turndown, undici, unpdf — dependency-free equivalents cover the common cases.
Requires Node.js ≥ 20 (uses global fetch).
The server speaks newline-delimited JSON-RPC 2.0 on stdio. Once published to npm, the one-liner is npx -y dsh-webfetch.
Smoke-test the server by hand (expect an initialize response and a tools/list response on stdout):
From the project README.
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