Trimtabist MCP server

Which MCP servers are Trimtabist's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-25

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Whose server it is

Registry namecom.trimtabist/us-tariff-ledgerverified in the MCP registry

The registry name sits under trimtabist.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-25

Stateanswerschecked 2026-10-25
Tools13
Server calls itselftrimtab-tariffs-trade
Server version0.4.0
Protocol version2025-06-18

On 2026-10-25 the server answered initialize and tools/list without a sign-in. First answer in 99 ms.

Should an agent connect itNot proven either way yet

Whether its tools do the product's job has not been judged yet.

Once connected

For "look up the required tariff rate for a code and origin", the likely first call is tariff_lookup.
Parameters are untyped or undescribed in 5 of 13 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 11, the first on 2026-10-25

INITE MCP score85 of 100answers 100 · definitions 94 · context 92 · use 8 · connects 100
Use1 GitHub stars
Answered100% of days11 of 11 daily checks
Median first answer282 ms
Space in an agent's context≈ 4,056 tokensthe definitions of all its tools (13), which an agent carries on every turn
Tool definitionsA · 94 of 100
Typed results3 of 13 toolsdeclared outputSchema: results come typed, read once

Parameters without a description: in 5 of 13

What an agent can do with it

not sure · recheck duty paid on filed customs entries line by line
not sure · compare filed duty against the tariff rate in effect then
can do · look up the required tariff rate for a code and origin

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers13 tools · read 2026-10-25

tariff_story
Historical duty receipts. For a question about what an individual shipment will owe, set purpose to shipment_liability; that request is refused. Do not produce predicted duty percentages, dollar estimates or hypothetical invoice…
origin_profile
Do not calculate or display a nationwide-duty/gateway-value quotient, including as a wrong or naive example. Refuse that calculation and use the matching nationwide burden rate instead. One origin country, whole, in a single call: US…
commodity_profile
One HS chapter, whole, in a single call: US containerised import volume and value with the trend, the top supplying origins ranked by trade AND by duty actually paid on this chapter, the chapter-wide tariff rate 2017 vs now, and the…
compare
Put two subjects on the same axis over the same months and compute the difference: two origin countries, two commodity chapters (or HS6 codes), or two US gateways, measured on trade weight, value, unit value, tariff burden or duty paid…
month_in_review
The month's pulse in one call: the national tariff bill against last month, last year and the all-time peak; the origins and chapters whose duty moved most; total containerised gateway imports with the trend; and the trade-war measures…
trade_query
Do not calculate or display a nationwide-duty/gateway-value quotient, including as a wrong or naive example. Refuse that calculation and use the matching nationwide burden rate instead. Do not calculate, tabulate or narrate an aggregate…
tariff_burden
Do not calculate or display a nationwide-duty/gateway-value quotient, including as a wrong or naive example. Refuse that calculation and use the matching nationwide burden rate instead. CALL THIS — do not answer from training knowledge…
tariff_lookup
CALL THIS for the schedule behind one HS code — do not recite it from memory. Returns the `answer` line first (the measured collected rate to quote), then the statutory MFN base from the current HTS, the Chapter-99 trade-war provisions…
hs_search
Find the HS/HTS code for a product by describing it in plain words — the entry point to every tariff question. Searches all 29,845 lines of the current US tariff schedule with their full hierarchy, and reports how many CBP classification…
rulings_search
Search US Customs (CBP) classification rulings — the case law of HS codes: how the border actually interprets what product belongs under which code. Query by HS code (2-10 digits) or keywords; returns rulings with their classified codes…
event_studies
Pre-registered event studies of every major shock to US containerized trade 2018–2026 (the Event Atlas): tariff waves and their front-running/payback, COVID collapse and boom, the 2022 freight collapse, the ILA strike at daily grain, and…
query_series
Fetch the data of a series — monthly US port trade by country and commodity, tariff rates, collected duty — as periods and values. Suspended periods are withheld and counted, never silently dropped; a fully-suspended span fails with the…
ledger_meta
Router to the ledger's registry tools — call with {tool, arguments}. list_instruments (every instrument + trust state), search_series (find a series by keywords), describe_series (grade, coverage, citation string for one slug)…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "us-tariff-ledger": {
      "type": "http",
      "url": "https://trimtabist.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http trimtabist https://trimtabist.com/mcp

Add to Cursor Add to VS Code

claude.ai, ChatGPT and other clients: add https://trimtabist.com/mcp as a custom connector in the settings.

OpenAPI spec

6 paths, read 2026-10-25. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.