How to Use OpenClaw Web Fetch

web_fetch is the lightweight way for OpenClaw to read a public web page. It is not a browser and it does not execute JavaScript. That is the point. For many articles, docs pages, changelogs, and simple marketing pages, a plain HTTP fetch plus Readability extraction is faster, cheaper, and less fragile than opening a browser tab. Use it when you need page content, not interactive state.

30-second answer

Call web_fetch with a URL, optional extractMode, and optional maxChars. OpenClaw sends an HTTP GET with a Chrome-like User-Agent and Accept-Language header, checks redirects, blocks private/internal hostnames, extracts readable content, and caches results for 15 minutes by default. Use markdown for structured reading and text when you want plain extraction.

Where it fits

Use web_fetch before browser automation when the page is public and mostly static. It is ideal for summarizing articles, checking documentation, extracting blog copy, or grounding an answer in a URL. If the page requires login, runs heavy JavaScript, hides content behind user interaction, or needs clicks, use the browser tool instead. The distinction keeps agents from doing slow UI work for simple reading tasks.

Docs-grounded facts

• web_fetch does a plain HTTP GET and does not execute JavaScript.
• extractMode can be markdown or text.
• Results are cached for 15 minutes by default.
• Private/internal hostnames are blocked and redirects are checked.
• Readability handles main-content extraction.
• Firecrawl can be used as a fallback when configured.

Set it up deliberately

No setup is required for the default path. The config under tools.web.fetch can tune enabled, provider fallback, maxChars, max response bytes, timeout, cache TTL, redirects, readability, and user agent. If Readability fails and Firecrawl is configured, OpenClaw can retry through Firecrawl for better extraction. Firecrawl overrides are locked to the official HTTPS Firecrawl host.

Use it safely

web_fetch deliberately blocks private and internal hostnames and re-checks redirects. That reduces SSRF risk when an agent is handed an arbitrary URL. In sandbox mode and private network contexts, respect those limits. Do not treat a fetched page as authoritative just because it was fetched; record the URL and date when the answer depends on mutable web content.

Common mistakes

The common mistake is using web_fetch for an app page that needs JavaScript. The result may look empty or incomplete because the content was never rendered. Another mistake is asking for huge pages without a maxChars strategy. The tool clamps output to configured caps and truncates oversized responses, so ask for the specific extraction you need.

Verification checklist

Check whether the returned content contains the section you asked about. If the answer matters, fetch the canonical page rather than a redirecting short link. For repeated research, remember the default 15-minute cache: it saves cost, but it also means immediate re-fetches may reflect cached content unless config says otherwise.

Playbook angle

The OpenClaw Playbook uses web_fetch as the first rung of the research ladder: fetch the page, summarize the facts, then escalate to browser only when the page demands interaction. That simple routing rule saves a surprising amount of agent time.

Operator note

How to Use OpenClaw Web Fetch works best when it is written into a small runbook instead of left as tribal knowledge. Record the intended owner, the exact config surface, the channel where results should appear, the allowed inputs, the expected output, and the rollback step. OpenClaw gives agents broad tools, but the durable value comes from making each tool boring, repeatable, and auditable. I would rather have one well-scoped web fetch workflow that survives a restart than five clever demos nobody can safely run next week. If the runbook cannot explain when not to use it, keep refining before automation becomes default.