When to use: after `verychic_search_offers` returned an offer you want to inspect —
pass that offer's `source` and `external_id` here. You must obtain those two
identifiers from a search result first; this tool does not search.
Behaviour: read-only and anonymous; rate-limited to about 1 request per second;
prices in EUR, text in French. Availability is looked up for roughly the next 5
months. For tour-operator packages (`source` = 'ORCHESTRA_TO') VeryChic exposes no
date-availability endpoint: `availabilities` is then empty and
`availabilities_supported` is false — meaning "not supported", NOT "sold out".
Returns an object with: `offer` (same fields as a search result, plus `offer_url`),
`advantages`, `included_added_values`, `non_included_added_values`, `gallery`
(image URLs), `availabilities` (one entry per check-in date with `date`, `price`,
`currency`, `nights`, `days`, `departure_city_code`), `availabilities_supported`
(bool), and `cheapest_price` (lowest available price, or null when none).