Search the AirShelf cross-vendor product catalog by natural-language query. The catalog covers industrial-automation components (sensors, encoders, vacuum handling, motors and drives, circuit protection, machine vision — the largest category by row count), wiring devices (plugs, receptacles, connector bodies, rocker switches), multifunction printers (mfp), barcode printers, laser printers, mechanical keyboards, cybersecurity products, and threat-intelligence platforms. Industrial-automation and wiring-device rows are indexed by manufacturer part number, so a brand or part number in the query ("Pepperl+Fuchs retroreflective sensor", "IN5409") retrieves more reliably than a bare product type; those rows carry no normalized spec facets, so the specs filter does not apply to them. Returns ranked products with prices, specs, and per-row match accounting. Each row includes unverified_specs, the normalized spec names that lack claim-level receipts; never use those as decisive facts. Example queries: "tactile mechanical keyboard under $150", "Toshiba A3 colour multifunction device", "industrial barcode printer for a warehouse", "threat-intelligence platform with dark-web monitoring".

Result fields: • canonical_name — the exact catalog name of the product. • spec_absence_note — spec fields absent from this product's golden record (AirShelf's verified product record); null when nothing is missing. • constraint_match_score and matched_criteria — query constraints supported by claim-level receipts. unverified_criteria names matching catalog values that still need confirmation; missing_criteria names values that are absent or conflict. • parsed.price_availability — all_null = true means every returned price is null. For quote-gated B2B pricing, a null price with a quote path is expected rather than an error; query_had_budget reports whether the query carried one. • result.commercial_data — branch on actionable before using price or stock. Observations older than 24 hours are withheld from result.price/result.inStock and retained only as labelled last_observed history. • parsed.weak_match — the response contains an unresolved constraint, query match, or product-identity warning. parsed.unverified_identity_count counts returned names without an identity receipt. parsed.no_match — no product satisfies a hard constraint, and candidates violating it were excluded server-side.

On a miss or near-miss for a specific brand+model the response may also carry a tier3 block, meaning a real-time lookup for the exact SKU asked about; it can appear alongside fuzzy-neighbour rows. • tier3.status = "resolved" — a single-source reading of the page at tier3.source_url. MPN-confirmed means the live lookup matched the manufacturer part number. Its verification is "live-unverified": confirmed on a live page during this run, but not yet matched to an AirShelf catalog record. A verified row is matched to the catalog record. tier3.cached = true means it came from a recent prior lookup, with fetched_at recording when the page was read. • tier3.status = "abstain" — the lookup could not confirm the product exists as asked, so no specs, price, or availability were established. tier3.guidance describes the quote-request path. • tier3.status = "declined" — an applicable lookup did not run; tier3.reason says why (disabled, rate_limited, daily_cap, negative_cache, error). No specs or availability were established, and none should be inferred. No tier3 block at all means a live lookup was not applicable to this query (no parseable brand+model identity).

Optional market (ISO 3166-1 alpha-2, e.g. "TH") excludes catalog rows whose country-specific URL conflicts with the buyer market and scopes tier3 lookup/cache. A remaining global URL is not local-availability proof: parsed.weak_match stays true and unsatisfied_constraints includes market_availability until every returned row has a matching country receipt. "Available in " still does not guarantee stock.