Spec Driven Development
by formulahendry
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Runs on your computer★ 440MITUpdated 14 months ago
Install
Tariffmonitor MCP
Overview
Description from the maker (original English)
US import tariffs: HTS lookup, stacked rate (MFN+301+232 by line+forced-labor), compare origins.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi3 of 3 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Computer or cloud
- Transport: stdio, Streamable HTTP
- Category: Other
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 3 of 3 passed
- Runs on the maker’s server: what you ask it goes through their server.
- Can do 3 things (tools) lookup_hts_code, calculate_tariff, compare_origins
- The registry lists no key to fill in.
You need
- Runs in the cloudNothing to install; it connects over the internet
- npmNode.js installed (for the npx command)
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Works in Claude on the web, desktop and mobile:
- Open Settings → Connectors
- Press Add custom connector
- Paste the address below and press Add
- If it asks you to sign in, sign in with the maker
https://adcreator-ai.com/mcp-freeOr run it on your computer
Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json
{
"mcpServers": {
"tariffmonitor": {
"command": "npx",
"args": [
"-y",
"tariffmonitor-mcp"
]
}
}
}Run this in your terminal
claude mcp add --transport http tariffmonitor https://adcreator-ai.com/mcp-freeOr run it on your computer
claude mcp add tariffmonitor -- npx -y tariffmonitor-mcpOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"tariffmonitor": {
"url": "https://adcreator-ai.com/mcp-free"
}
}
}Or run it on your computer
Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"tariffmonitor": {
"command": "npx",
"args": [
"-y",
"tariffmonitor-mcp"
]
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"tariffmonitor": {
"type": "http",
"url": "https://adcreator-ai.com/mcp-free"
}
}
}Or run it on your computer
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"tariffmonitor": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"tariffmonitor-mcp"
]
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
- Open ChatGPT on the web → Settings → Connectors (Apps)
- Press Create or Add (some plans need Developer mode under Advanced first)
- Paste the address below, give it a name and save
- If it asks you to sign in, sign in with the maker
https://adcreator-ai.com/mcp-freeMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
Tool names and descriptions exactly as the server reported them on Nov 6, 2026. The maker wrote them, not us; we show them as plain text.
lookup_hts_codeFind the US HTS (Harmonized Tariff Schedule) code for a product, by plain-language product name or numeric prefix, from the official USITC schedule (19,856 10-digit codes). Use this first whenever you have a product name rather than a code (e.g. "laptop", "t-shirt", "water bottle
calculate_tariffCalculate the full stacked US import tariff rate for an HTS code from a specific origin country. Returns: base rate, each additional layer (China Section 301 matched by HTS line to Lists 1, 2, 3, 4A and the 2024 four-year-review increases; Section 232 steel, aluminum and copper m
compare_originsCompare the estimated US import tariff for ONE HTS code across several origin countries side by side (e.g. China vs Vietnam vs Mexico vs India), for sourcing and "China plus one" decisions. For each origin returns the total current rate, the layers that make it up (MFN base, Sect
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account daleweaver1981, which owns the repo
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- ✓ Pass
Endpoint responds
Responded in 264 ms (HTTP 200)
- – Not applicable
Sign-in with OAuth
No sign-in needed
- ✓ Pass
No hidden instructions in tool descriptions
Read 3 tool descriptions and found no hidden instructions to the AI
Compared with others in Otheri
- More stars than 0% of the other 32623 servers in this category
- Published to the registry more recently than 90% of the other 32623 servers in this category
- Basic checks equal to or better than 100% of the other 32623 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Tariffmonitor MCP safe?
It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
Either way works: install it on your computer or connect to the cloud version.
Is it still maintained?
The GitHub repo last changed –, and the latest version (1.4.4) reached the registry 3 days ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, Draugr
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Remote Desktop Commander
by desktop-commander
Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.
Runs in the cloud★ 211Updated 2 days ago
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Draugr
by draugr-dev
Security scanning for AI agents: SAST, SCA, secrets, IaC, DAST, ranked by real risk.
Runs on your computerUpdated today
Install
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
tariffmonitor-mcp
tariffmonitor-mcp is US import tariff lookup software by 0xpi for AI agents and developers: an MCP server that looks up 19,856 HTS codes and estimates stacked US import duty rates (MFN, Section 301 and Section 232) by country of origin. Free and open source, with a free hosted endpoint. It is not an electricity or energy tariff tool. Made by 0xpi; 0xpi is not affiliated with Pi Network, any cryptocurrency or blockchain project.
MCP server for the Tariff Exposure Monitor — a live US import tariff calculator covering 19,856 HTS codes.
Give Claude (or any MCP-compatible AI) the ability to look up real stacked tariff rates and see what changes when the Section 301 China product exclusions end (through 11:59 p.m. EDT on November 9, 2026 per the Federal Register, FR Doc. 2025-21671; USTR's 26 Nov 2025 press release says "until November 10, 2026") for any product.
What it does
Three tools:
| Tool | What it does |
|---|---|
lookup_hts_code | Search 19,856 HTS codes by product name or numeric prefix. Everyday words a keyword search misses (laptop, t-shirt, water bottle, earbuds, toys, e-bike, running shoes and ~90 more) map to the official USITC heading(s) that cover them, with the 10-digit lines ranked by match |
calculate_tariff | Returns an estimated stacked rate (MFN base + China Section 301 by HTS line, Lists 1-4A and the 2024 four-year-review increases + Section 232 steel/aluminum/copper matched by HTS line to the chapter 99 U.S. note 16 lists + Section 301 Brazil + the 2026 Section 301 forced-labor tariff on 60 economies; other Section 232 programs flagged as needs review), the date the data was checked, each exemption or assumption, and the Section 301 China exclusion end (11:59 p.m. EDT, 9 Nov 2026 per the Federal Register; 10 Nov 2026 in USTR's press release). Optional: annual import volume → dollar impact; date (YYYY-MM-DD) → the rate in force on that entry date |
compare_origins | One HTS code, 2-8 origin countries side by side (e.g. CN vs VN vs MX vs IN), lowest rate first, with each layer, the post-9-Nov-2026 rate and optional annual dollar duty. For sourcing and "China plus one" decisions |
Effective-date-aware (1.5.0, 4 Nov 2026). Pass date to calculate_tariff or compare_origins and the rule in force on that entry date is applied (default: today, US Eastern). For products of China the server applies the 178 Section 301 product exclusions by statistical number (HTSUS ch. 99 U.S. note 20(vvv) and 20(www), headings 9903.88.69/.70, through 9 Nov 2026 per FR Doc. 2025-21671): a whole-number exclusion takes the List duty off the total, a description-limited one is reported with the rate for matching goods. It also applies the maritime Section 301 headings: 9903.92.10 (+25% on ship-to-shore gantry cranes since 27 Sep 2024) and, from 10 Nov 2026, 9903.91.14 (+100% on those cranes, on top of 9903.92.10 as U.S. note 31(l)(i) states) and 9903.91.12 (+100% on intermodal chassis, shown as "up to" because chapter 99 does not say how it combines with List 3). Each answer cites its chapter 99 note and Federal Register document, and says when it depends on a proposed, not final, extension (FR Doc. 2026-21755 proposes suspending the maritime duties to 9 Jan 2027). A daily Federal Register check moves these dates the day a final notice is published.
Example exchange: a real capture from the live hosted endpoint (/mcp-free) on 2026-10-26 (version 1.4), not a mock-up:
You: What's the tariff on athletic footwear from China, and what does it cost me at $800k/year?Claude: [calls lookup_hts_code query="athletic footwear", then calculate_tariff hts_code="6404110000", origin_country="CN", annual_import_value_usd=800000]
Note: 6404110000 is not in the schedule. This rate is for heading 640411, resolved to 6404112030.
HTS 6404112030 — For men Origin: CN Data checked: 2026-10-24
Rate stack: MFN base rate (10.5%): +10.50% Section 301 China, List 4A (heading 9903.88.15): +7.50% Section 301 forced-labor tariff (2026): +12.50% Total current rate: 30.50%
No rate change projected for this code/country combination when the Section 301 China exclusions end.
Section 301 forced-labor tariff (FR Doc. 2026-15181; data checked 2026-10-24): included (+12.5%). China: +12.5%, heading 9903.05.31. Stacks on other Section 301 duties.
Section 232 steel, aluminum and copper coverage is checked by HTS line (U.S. note 16(c)); the other Section 232 programs (vehicles and parts, wood products, trucks, semiconductors) are flagged when the line is named in their notes. Goods subject to any of them are exempt from this layer (U.S. note 52(f)).
Section 301 China product exclusion end, two official wordings: the Federal Register notice (FR Doc. 2025-21671, 90 FR 55232, 1 Dec 2025) extends the exclusions "through 11:59 p.m. eastern daylight time on November 9, 2026"; the USTR press release of 26 Nov 2025 says the 178 exclusions "have been extended until November 10, 2026". The Federal Register text is the legal one. This calculator does not model individual exclusions.
Dollar impact at $800,000/yr import value: Current annual duties: $244,000
The Section 301 forced-labor layer (USTR, 60 economies, entries from 12:01 a.m. ET on 24 Jul 2026, Federal Register 91 FR 47318, HTS 9903.05.20-9903.05.84) is 12.5% or 10% depending on origin; for the EU and Taiwan it tops the MFN rate up to 10%, and for Japan, South Korea and Switzerland up to 12.5%. Products listed in U.S. note 52 and goods carrying a Section 232 layer are exempt; exemptions that depend on facts the tool cannot see (USMCA or CAFTA-DR qualification, civil-aircraft or pharmaceutical use) are stated as assumptions in the answer.
Rates change, and a rate is per HTS code and origin country - treat the numbers above as the shape of the answer, not as a quote for your shipment. The tool never invents a rate: if the upstream is unreachable or the code is not in the schedule, it says so instead of estimating.
Try it without installing (free hosted remote)
A keyless public endpoint serves the same three tools over Streamable HTTP:
https://adcreator-ai.com/mcp-free- No key, no signup. Limits: 25 tool calls per IP per day, and 500 per day across all users (reset 00:00 UTC).
initializeandtools/listdo not count. - Over the limit you get a JSON-RPC error (HTTP 429) that points to the npm package below, which has no limit because it runs on your machine.
- Each call is logged (time, method, tool, status, user agent, client IP, and the client name the MCP client reports) to measure use and filter scanners. The log does not store tool arguments. Log lines are deleted after 365 days. Full details: Privacy Policy.
Claude Code: claude mcp add --transport http tariffmonitor https://adcreator-ai.com/mcp-free
Install (Claude Desktop)
Add to your claude_desktop_config.json:
{"mcpServers": { "tariffmonitor": { "command": "npx", "args": ["-y", "tariffmonitor-mcp"] } } }
Restart Claude Desktop. The lookup_hts_code, calculate_tariff and compare_origins tools appear automatically.
Install (Cursor / other MCP clients)
{"mcp": { "servers": { "tariffmonitor": { "command": "npx", "args": ["-y", "tariffmonitor-mcp"] } } } }
No API key required
The tool calls the free public API at adcreator-ai.com. No signup, no rate limits for reasonable use.
Related
- Free tariff calculator — browser version
- Official US Harmonized Tariff Schedule — the authoritative rates
Built by Dale Weaver / 0xpi.
Privacy Policy
The hosted endpoint https://adcreator-ai.com/mcp-free is covered by the privacy notice at https://adcreator-ai.com/public/mcp-privacy.html. In short:
- Collected: for each request, the time, MCP method, tool name, status, duration, client IP address, user agent and the client name/version sent at
initialize. Tool arguments are not stored in the call log. Rate limits use a hashed form of the IP address. - Use: answering the call, rate limits, abuse and scanner filtering, and counting use. No profiling, advertising or sale of data.
- Sharing: none beyond hosting providers. HTS lookups go to our own tariff database (adcreator-ai.com), which records the HTS code and origin country of each rate lookup without your IP address. No data is sent to AI providers.
- Retention: call-log lines are deleted automatically after 365 days; rate-limit counters last one day.
- Contact: customer.service@0xpi.com for access or deletion requests.
The npm package (npx -y tariffmonitor-mcp) runs on your machine and sends only its lookups (product search words, HTS codes and origin countries) to the same tariff database.