Cuelark Tools MCP Server

by cuelark Your server? Claim it

answering

Cuelark Tools is answering right now. Last checked 11 min ago. It exposes 15 tools.

Exact tools for agents: US tax, routing/EIN checks, business days, JSON, links, packages, citations.

Uptime history 17 hours of history

17 hours agonow

100.0%

Uptime 24h

61 of 61 checks

Tools

read from the server

649 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Cuelark Tools every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add tools --transport http https://tools.cuelark.com/mcp

Settings → Connectors → Add custom connector, then paste this address

https://tools.cuelark.com/mcp

~/.codex/config.toml

[mcp_servers.tools]
url = "https://tools.cuelark.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "tools": {
      "url": "https://tools.cuelark.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "tools": {
      "type": "http",
      "url": "https://tools.cuelark.com/mcp"
    }
  }
}

Available tools 15

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

verify

verify_citation

Check that a paper exists and get its canonical metadata (title, authors, year, venue, DOI link, retraction flag) by DOI, arXiv id, or title plus author. Uses Crossref, OpenAlex and arXiv. No abstracts.

verify_links

Check up to 20 URLs live: HTTP status, redirects, final URL, page title and canonical, and optionally whether each page contains a quote. Respects robots.txt and refuses private addresses.

calculate

calculate

Exact decimal arithmetic for an expression (no floating-point drift: 0.1+0.2 = 0.3; + − × ÷ ^ %, sqrt, ln, log, round, min, max, pi), summary statistics for a list of numbers, rounding with a chosen mode, and adult BMI from lb/in or kg/cm.

component

ui_component_lookup

Search the ui.cuelark.com shadcn/ui registry (React components, blocks, themes) and get the shadcn CLI install command for each match.

convert

convert

Unit conversion (imperial and metric: length, weight, volume, area, speed, temperature, data, pressure, energy), color hex/rgb/hsl, WCAG contrast ratio, numbers in words and $ or lakh/crore formats, Markdown to HTML, pixels vs print size at a DPI, and CGPA to percentage (official formulas).

dates

dates

Calendar math: days between dates, add days/weeks/months/years, exact age (with exam cut-offs), business days skipping public holidays (US federal by default; UK, EU, CA, AU, IN, SG, AE), a country's holiday list, and cron schedules in plain English.

encode

encode

Base64 and URL encode/decode (UTF-8 safe), MD5/SHA-1/SHA-256/384/512 hashes, new UUID v4/v7 or ULID (or read a ULID's time), and decode a JWT's header and payload without verifying it.

finance

finance

Monthly loan payment (EMI) with a yearly amortization summary, simple and compound interest (with monthly contributions), percentage math (of, what percent, change, add, subtract), and tax added to or removed from a price at a given rate (VAT, sales tax, or India GST with CGST/SGST/IGST split).

ifsc

ifsc_lookup

Bank, branch, address, MICR and NEFT/RTGS/IMPS/UPI support for an Indian IFSC code, from RBI's published lists via Razorpay's IFSC dataset.

income

income_tax

Estimate income tax from official tables. us_federal: 2025 or 2026 IRS brackets, standard deduction (with 65+/blind extras) or itemized, by filing status. india: FY 2025-26 or 2026-27, new vs old regime with 87A rebate, surcharge and cess. Each answer cites its source.

json

json

Validate and pretty-print or minify JSON (errors give line and column), or convert JSON to YAML or CSV, or CSV to JSON.

package

package_check

Does this package exist (catches invented names)? Latest version, deprecation, license, repository, last publish, downloads, and the newest version matching a range. Ecosystems: npm, pypi, crates.

text

text

Exact text facts models get wrong: word/character/grapheme counts, whether text fits X, SMS, meta title/description or custom:N limits (with a truncated version), letter frequency, case conversion, slugs, JavaScript regex matches and replacements, lorem ipsum, and OpenAI token counts.

time

time

Current time anywhere (with DST state and next clock change), convert a wall-clock time between zones, or convert Unix timestamps to and from dates. Accepts IANA zones or common names (ET, PT, UTC, London, IST).

validate

validate

Check an identifier's format and check digit: US ABA routing number, EIN, SSN (format rules only), ZIP; card numbers (Luhn) and IBAN; India GSTIN, PAN, IFSC, UPI ID, Aadhaar (Verhoeff) and PIN code. Proves a value is well formed, not that it's registered. Nothing is stored.

Endpoints

URL	Transport	State	Latency	Checked
https://tools.cuelark.com/mcp	streamable-http	answering	5052 ms	11 min ago

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Cuelark Tools — questions

Answers built from our own checks of this server.

What can Cuelark Tools do?

It exposes 15 tools, read directly from the server on our last check. Among them: calculate, convert, dates, encode, finance, ifsc_lookup and 9 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Cuelark Tools working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 61 of 61 checks got a reply (100.0%), average response time 649 ms. The bar chart above shows every period we have measured.

How do I connect Cuelark Tools?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Cuelark Tools need an API key?

No. Cuelark Tools completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 15 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Cuelark Tools?

It answers our handshake in 649 ms on average, which is faster than 15% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.