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Full-text search inside type-approval document bodies (PDF text). Covers ОТТС / ОТШ / ЗОТТС / ЗОТШ. Other document kinds (СБКТС / ЗОЕТС / СУТ / cert / decl) are not covered by full-text search. **Premium feature** — requires a plan that includes full-text search (see https://hpt.su/pricing/) with a subscription covering at least one type-approval kind.

List the files attached to a document. Returns `[{file_uid, file_name, kind, pages_count, published_at}]` — each entry's `file_uid` can be passed to `download_document_file`. A document often has several PDFs (e.g. cleaned + original); use this tool to enumerate them and pick the right one before download.

Get links for a document file: page URL for everyone, direct download URL when the plan allows it. Always returns `document_page_url` — the document's page on hpt.su where the user can download the file manually under their account. Share this link with the user. When the plan includes direct downloads, the response also contains `download_url` — a personal temporary link to the PDF. It can be fetched programmatically: send a GET request with the same `X-API-Key: <key>` header used for this API. In a browser it works when signed in to hpt.su under the account that owns the key. The link is bound to the key owner — it does not work with anyone else's key or account. The download quota is charged at actual download time. Otherwise `download_url` is null and `download_note` explains why.

Search academic literature across OpenAlex, Crossref and arXiv in one call: title, authors, year, venue, DOI, citation count, abstract and a DIRECT open-access PDF link where one exists. Deduplicated across sources, filterable by year and open-access, optional BibTeX per paper. One request replaces three APIs. Pay-per-call via x402 (USDC, Base).