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The response also includes metadata such as feed format, source URL, final URL after redirects, total new item count, number of items returned, bytes read, and any undated items not checked.","failureModes":["Feed URL is unreachable or returns non-200 HTTP status — response indicates error with status code and reasons","Feed URL does not point to a valid RSS, Atom, or RDF document — parse failure or verdict indicating invalid format","The 'since' date is malformed or in an unsupported format — validation error returned","No items newer than the given date exist — returns empty items array with newCount of 0","Feed requires authentication or is behind a paywall — fetch fails with access error","Limit parameter out of range (not 1–50) — validation error"],"whenToPreferThis":"Use this endpoint when you need only the items published after a known cutoff date from an RSS or Atom feed, rather than fetching all recent items. 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