Trade Core
CertifiedTrade Compliance
Benchmarked, with the method and the known failure modes published. How we measured it.
HTS tariff classification with CBP ruling precedents and tariff-critical attribute extraction.
You connect this skill to Claude or ChatGPT as an MCP server and then ask in your own words — there is no Proofwork application to log into. Its tools return reference data: candidate options, evidence cards, ruling precedents and the instructions for reading them, so your assistant can reason through each decision step by step and cite what it relied on. Proofwork never calls a model and never sees your conversation.
Get Started
Add one URL to your assistant and ask about your first product.
Learn More
What the tools return, where it is strong, where to verify, and the published accuracy.
What's included
- Find the 4-digit HTS heading from candidate evidence cards
- Pick the 6-digit subheading from group evidence
- Pick the exact 10-digit code from leaf codes + precedents
- Compare selected code against sibling codes
- Extract tariff-critical attributes from a product description
- Browse the labeled code tree for any heading
- Inspect available codes under any heading