Tools reference changedtools-reference
Nearest release: v2.1.276, published 2 hours after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
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14 Aug 2026
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Recorded edits87to this page, all time
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545545A few behaviors shape the response Claude receives:
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547* WebFetch refuses `localhost` and any other hostname without a dot, such as a bare intranet name, before making a request. The [error it returns](/docs/en/errors#webfetch-cannot-fetch-localhost) tells Claude to reach local servers with `curl` through Bash instead.
547548* HTTP URLs are automatically upgraded to HTTPS.
548549* Large pages are truncated to a fixed character limit before processing.
549550* WebFetch caches each response for 15 minutes by default, so repeated fetches of the same URL return quickly. On Claude Code v2.1.233 or later, set [`CLAUDE_CODE_WEBFETCH_CACHE_TTL_MS`](/docs/en/env-vars#variables) to change how long WebFetch keeps each response.
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