dsh-webfetch

为 DeepSeek Harness 智能体装上「阅读器」：给定 URL，抓取网页并提取干净的 Markdown / 纯文本正文，附带链接清单。零运行时依赖，只读，不发送任何凭证。 English | 中文简介

A web page reader plugin for DeepSeek Harness (dsh). dsh agents can search, but until now they could not read the page behind a URL. dsh-webfetch closes that gap with two read-only tools and zero runtime dependencies (Node built-ins + global fetch only).

Tools

web_fetch

Fetch a web page and extract its readable content.

Parameter	Type	Default	Description
url	string (required)	—	Full http/https URL of the page to fetch.
format	'markdown' | 'text'	markdown	Markdown keeps headings, links, lists and code fences; text is plain prose.
extractLinks	boolean	false	Also return every link found on the page (resolved, absolute).
maxChars	number	50000	Cap on extracted content length (1000–200000).

Returns { url, finalUrl, status, title, content, length, truncated, links? }.

user: what does the dsh README say about the architecture?
agent: web_fetch("https://github.com/deepseek-ai/deepseek-harness")
  → HTTP 200 — title: deepseek-harness
    ## DeepSeek Harness
    ..."everything is a plugin"...

web_links

Collect every link on a page with its visible label, resolved to absolute URLs, deduplicated, capped at limit (1–200, default 50). Useful for mapping what a page points to or crawling site structure.

Install

dsh plugin add github:TYEclipse/dsh-webfetch
# or a pinned release:
dsh plugin add github:TYEclipse/dsh-webfetch#v0.1.0

Restart your agent session and the tools are available to the model.

Configuration

All settings are optional (defaults shown):

plugins:
  dsh-webfetch:
    timeoutMs: 10000        # per-request timeout (1000–60000)
    maxBytes: 1500000       # response size cap in bytes (10000–5000000)
    maxChars: 50000         # extracted content cap in chars (1000–200000)
    maxRedirects: 3         # redirect hops to follow (0–10)
    userAgent: "dsh-webfetch/0.1 (DeepSeek Harness plugin)"

Safety model

• http/https only — file:, ftp:, javascript: and friends are rejected.
• No credentials ever — URLs with embedded credentials are rejected; no cookies or authorization headers are attached; nothing is persisted.
• Bounded everything — hard timeout per request, redirect hop limit, response size cap, extracted-text cap. Oversized bodies are cut off and flagged (truncated: true), never buffered past the cap.
• Content-type gated — only text/html and text/plain responses are parsed; scripts, styles, comments and embedded content are stripped by the extractor.
• Charset-aware — honours the Content-Type charset, falls back to <meta charset> sniffing, then UTF-8.

Development

pnpm install
pnpm build      # tsc
pnpm test       # vitest — 32 tests, fully offline (local fixture server)
pnpm lint       # oxlint src test

License

MIT

---

中文简介

dsh-webfetch 是 DeepSeek Harness 的网页阅读插件：智能体拿到 URL 后可以直接抓取页面并提取干净的 Markdown 或纯文本（保留标题、链接、列表与代码块，剥离脚本/样式），另一个工具 web_links 可列出页面全部链接（解析为绝对地址、去重、限量）。零运行时依赖、只读、不发送凭证；http/https 协议限定、超时/重定向/体积/文本长度全部有上限，字符集自动识别（Content-Type → meta → UTF-8）。与内置搜索互补：搜索给线索，webfetch 读正文。