yaktool-compliance-mcp

yaktool-compliance-mcp

Product compliance as an MCP server — the compliance-domain suite of yaktool.com.

Seven regulatory checks that reject listings and filings for reasons a text search will not find: a missing EU responsible person, an unclosed polygon, a rounding increment applied the ordinary way, a kilocalorie figure obtained by dividing kilojoules by 4.184, a threshold crossed by 0.0001 %, a certificate written to a version of the rule that was replaced, a declaration of conformity checked against the wrong annex. 97 documented rules (18 GPSR, 24 EUDR, 8 US nutrition, 13 EU nutrition, 8 fragrance, 12 CPSC certificate, 14 EU declaration of conformity), each citing its source — and saying so plainly when a rule is our engineering reading rather than regulation text, or when it comes from Commission guidance rather than the Regulation itself. No network I/O.

Tools

• check_gpsr_listing — judge a listing against the four elements of Article 19 GPSR separately: manufacturer identity and contact, an EU responsible person where the manufacturer is outside the Union, product identification, and warnings in each market's language. Catches the most common failure — a correct manufacturer block with nobody inside the Union attached — and rejects a "responsible person" whose address turns out to be in the UK. The picture element is always reported as a manual check, never quietly passed.
• check_eudr_geojson — pre-check plot geolocation before a Due Diligence Statement: unclosed polygons, swapped longitude/latitude, coordinates reused across farms, points that collapse at six decimals, and plots over 4 hectares submitted as a single point. Every polygon is measured from its own coordinates and compared with the declared Area. On boundaries over 2000 vertices the self-intersection check is skipped and the result says so rather than implying a pass.
• check_nutrition_facts — turn laboratory values into the numbers a US Nutrition Facts panel must print. FDA rounding is not ordinary rounding: every nutrient has its own increments at its own levels, some values are words (less than 1 g) rather than numbers, and calories are computed from the unrounded macronutrients — a shortcut this tool detects.
• round_nutrient_value — the same rounding for a single nutrient, with the increment rule that applied, for when you need one number rather than a panel.
• check_eu_nutrition_declaration — check a declaration for an EU pack against Regulation (EU) No 1169/2011: energy recalculated from the Annex XIV factors (kJ and kcal are two factor columns, so kcal is not the kJ figure over 4.184), carbohydrate that includes polyols and excludes fibre, the Annex XV order, and the rows the declaration may not carry at all — trans fat, cholesterol, or a sodium figure where salt is required. Findings from the Regulation are errors; findings from the Commission's rounding and tolerance guidance are warnings, because that document states it has no formal legal status.
• eu_nutrition_tolerance — the range an official control accepts for one declared value. It is not declared ± 20%: the printed figure is widened back to every value that rounds to it, the band for that nutrient at that level is applied, and both ends are rounded back. A declared 8.5 g of sugars accepts 6.5 to 11 g.
• check_cpsc_certificate — check a US Children's Product Certificate or General Certificate of Conformity against 16 CFR Part 1110. The eFiling rule rewrote § 1110.11 and it has been in force since 2026-07-08, so most templates in circulation are missing three things at once: a unique identifier (GTIN, model, SKU, UPC…) where a description used to do, an email address on all four parties rather than only the records custodian, and the prescribed attestation. Validates the check digit when the identifier is a GTIN or UPC, and flags the classic mismatch of a foreign factory named as the finished product certifier.
• check_eu_declaration_of_conformity — check an EU/EC Declaration of Conformity against the annex that actually applies, not against "the eight elements" (those are the model in Annex III of Decision 768/2008/EC). It detects the directives the declaration cites and checks the union of their annexes, which is what stops the false positives: Annex IV of the LVD and Annex VI of RoHS have no notified body item at all, the declaration number is optional under RED, EMC, LVD, PPE and Machinery, a colour image is mandatory only for toys, and citing a standard without its version is a defect under RED yet fine under the LVD.
• check_fragrance_allergens — convert allergen concentrations in a fragrance compound to their concentration in the finished product and compare against the leave-on and rinse-off thresholds. Deliberately does not ship a substance list: the authoritative one is not publicly retrievable, and a transcribed-from-blogs list would be worse than none.

Install

claude mcp add yaktool-compliance -- npx -y yaktool-compliance-mcp

Same engine as the browser tools at yaktool.com/ecommerce/gpsr-listing-checker.