Hamilton Customs · Launch access
The tariff, read at the entry date.
U.S. customs research for Claude: the HTSUS with its legal notes, the dated tariff stack of Section 301, 232, IEEPA and AD/CVD, Title 19 vintaged yearly, 220k+ CROSS rulings. It classifies, computes the duty stack, drafts the entry and works the case — plugged into Claude, open for evaluation.
Who Hamilton Customs is for
For the people who put their signature on the entry, and for those who defend it afterward. Each asks their own question, and the answer comes back sourced.
At the entry
Licensed customs brokers. Classification calls and entry files with the schedule, its notes and the rulings in one place — reasonable care, on the record. Filed 8517.62 for three years; a competitor’s ruling reads it elsewhere — prior disclosure, protest, or § 1592 exposure?
Trade compliance officers. Screening, forced-labor exposure and the dated tariff stack, read before the goods move. Extrusions finished in Vietnam from Chinese billets: does the substantial-transformation call hold against Section 301?
Control and dispute
Trade attorneys. Section 1592 exposure with prior disclosure run both ways, protest posture, and precedent weighed by side. First-sale on a three-tier China chain: what must the record actually prove?
Import and export managers. One connector spans the import file and the export controls that follow it out. Liquidated in 2024, a retroactive Section 301 exclusion published after — refund path and deadline?
What the shelf holds
The shelf is read piece by piece: the schedule, the dated measures, the vintaged law, the fonds of decisions. Every answer cites the text in the version in force at the entry date.
- The schedule, at its current revision The full HTSUS hierarchy with its legal notes; classification descends through the schedule’s own children, never a lexical shortcut. Chapter‑99 additional tariffs — Section 301, Section 232, IEEPA — each carrying its dated Federal Register chronology.
- The law, vintaged Title 19 U.S.C. served one vintage per year, 2017 to today, and 19 CFR complete. Served texts carry their life tags — revoked, modified, dated — with the § 1625(c) 60-day effect carried on the text.
- Enforcement, computed AD/CVD orders, § 1592 penalty math with prior disclosure run before and after, and UFLPA Entity List screening.
- Precedent, weighed by side 220k+ CROSS rulings as a live store, the EBTI and WCO HS Committee decisions weighed as persuasive, CAFC customs appeals in their official opinions, and the CIT barometer.
- Export controls, on the same connector EAR, ITAR and OFAC with their statutes and CFR, the Consolidated Screening List, ECCN, USML and Schedule B, and the Commerce Country Chart.
- At the border PGA import flags, ports directives, and entry files drafted for broker review.
The whole life of an entry
Not a menu of modules: the corpus follows the file wherever it goes — from the question upstream to the dispute after liquidation, with the same demand for a source.
Before filing
Classification argued from the schedule and its legal notes, the duty stack computed at the intended entry date, valuation and origin documented before anything is signed — program and regime choices weighed on the numbers.
At the border
Agency requirements read for the actual goods, forced-labor exposure screened before it detains, and IP and e-commerce thresholds read as filed.
After liquidation
Audits and verifications prepared on the record, penalty math and disclosure timing, protest through litigation with precedent weighed by side — and criminal exposure when a file turns.
Outbound and at the desk
Export classification, licensing and screening; the messy file read as it comes; and what must be signed, drafted for signature — every statement under citation.
Deliverables, not links
Answering is the floor. The connector works the file and hands back pieces ready for professional review.
The entry, drafted
Line by line from the documents in the file, with classification, value, origin and program claims justified — ready for broker review before filing.
The numbers, computed at the entry date
The full duty stack, each layer with its dated citation, plus § 1592 exposure and prior-disclosure math, both paths.
The case, worked end to end
Deadlines checked and defenses weighed on precedent, with protest and petition drafts written to the record — from notice to forum.
The export file
The classification call, the license path and the screening run, with the determination memo ready to sign off — before the goods move.
Every piece leaves as a draft with its citations — the signature stays with the professional.
Questions the way they land on the desk
Six working-day situations, to type as they come once the connector is added: the answer comes back with its citations — schedule line, Federal Register measure, ruling, decision.
A broker, on reasonable care
Our importer filed 8517.62.00 for three years; a ruling issued to a competitor reads the same device elsewhere. Prior disclosure, protest, or prospective change — and what does the § 1592 exposure look like either way?
A compliance officer, on origin
Aluminum extrusions finished in Vietnam from Chinese billets: walk the substantial-transformation call, the Section 301 exposure, and the AD/CVD circumvention risk — with the dated citations.
An import manager, on a refund
Entry liquidated in 2024; a retroactive Section 301 exclusion covering our line published afterwards. Refund path, deadline, and who bears the interest?
Counsel, on valuation
First-sale on a three-tier China chain: what must the record actually prove, and where has the Court of International Trade drawn the line?
Counsel, on a detention
Shipment detained under UFLPA: which rebuttal evidence has actually moved these cases, and in what order should it be presented?
A CFO, after self-review
We self-discovered two years of unpaid Section 232 on misclassified brackets: prior disclosure now, or protest the liquidations first — sequence, math, and exposure either way?
Add Hamilton Customs to Claude
Three moves, about two minutes, no account to create during launch: the connector opens prefilled in Claude.
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Click “Add to Claude”
The button opens claude.ai with the connector prefilled: the name, Hamilton Customs, and the connector URL are already in place.
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Confirm the connector in Claude
On claude.ai or in Claude Desktop, approve the connector Claude shows; it joins your list. Nothing to sign up for and no payment on this site.
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Ask your first question
Take one of the sample questions: the answer cites schedule line, dated measure, ruling and decision.
Prefer to do it by hand? Paste the connector URL into Claude (Settings, then Connectors, then “Add custom connector”):
https://hamilton-customs.147-93-52-143.nip.io/mcp
Hamilton Customs runs inside Claude, on claude.ai or in Claude Desktop. Answers do their best work with a capable model such as Claude Opus.
Four questions, before you install
Do I need an account or a subscription?
During the launch window, access is open: no sign-up, no payment, no key to request. The connectors are intended to become subscription services; terms will be announced on this site before any change, and adding them will stay this simple.
Is this customs advice?
No. Hamilton Customs is a research aid for professionals. Classification calls, penalty math and drafted filings ship as working papers for licensed review; reasonable care remains with the filer and the broker of record.
How current is the record?
The HTSUS is served at its current revision. Chapter-99 measures carry their dated Federal Register chronology, Title 19 is vintaged yearly from 2017, and CROSS is a live store of 220k+ rulings. Served texts carry their life tags, so a revoked ruling is never cited as current.
Does it cover export controls too?
Yes, on the same connector: EAR, ITAR and OFAC with their regulations, the Consolidated Screening List, ECCN, USML and Schedule B, and the Commerce Country Chart.
The schedule is open
The connector opens prefilled in Claude; the first answer comes back with its citations.
Launch access — open, no account required.