You'll notice
WebFetch now gives a specific error for localhost and other dotless hostnames, pointing to curl instead
What
WebFetch (the tool Claude Code uses to retrieve a URL) now throws a specific error when the requested URL's hostname has no dot in it, such as localhost or a bare hostname. The error tells the user to use curl via the Bash tool instead. The tool's own description was also updated with this caveat.
Why
WebFetch was never able to reach local servers, but previously the failure was less clear. Now the error explains why it failed and points directly to the working alternative for hitting something running on your own machine.
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Anthropic's release notes agree
Changed plain WebFetch deny and ask rules to no longer apply to Artifact tool reads and updates; use an Artifact rule (or…