Free text and data tools: JSON, tokens, cron, dates, age cut-offs, CGPA, time zones, print sizes.
Scored across 15 tools
Most tools map to a clearly distinct operation (encode vs json vs package_check vs verify_links), but a few boundaries are fuzzy: dates vs time (calendar math vs clock/timezone) and validate vs ifsc_lookup (both act on IFSC codes) can plausibly be confused. calculate vs finance also overlap on percentage-style math. Descriptions generally disambiguate, so misselection risk is low but not zero.
All names are lowercase snake_case with a uniform casing style, which keeps the set predictable. However, the semantic style mixes bare verbs (calculate, convert, validate), bare nouns (dates, json, text, time, finance) and noun_phrases (ifsc_lookup, income_tax, ui_component_lookup), so there is no single verb_noun pattern.
Fifteen tools sits at the top of the well-scoped band, and each tool covers a genuinely distinct utility area with no filler entries. Nothing appears redundant enough to drop, and the surface is not so large that an agent would struggle to scan it.
Coverage across math, units, dates, encoding, finance, tax, JSON, packages, text, time, validation, links, citations and lookups is broad and covers most agent reference needs. Minor gaps remain, notably currency/fx conversion (convert handles physical units but not money) and a general URL fetch/extract capability beyond status checking.
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.
Inputs: op, mode, value, values, +6 more.
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).
Inputs: op (required), bg, fg, to, +10 more.
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.
Inputs: op (required), end, exam, unit, +9 more.
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.
Inputs: op (required), algo, text, count, +2 more.
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).
Inputs: op (required), a, b, kind, +9 more.
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.
Inputs: ifsc (required).
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.
Inputs: income (required), fy, op, year, +7 more.
Validate and pretty-print or minify JSON (errors give line and column), or convert JSON to YAML or CSV, or CSV to JSON.
Inputs: input (required), op, indent, sort_keys.
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.
Inputs: name (required), ecosystem, version_range.
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.
Inputs: op, to, text, unit, +7 more.
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).
Inputs: op, date, time, zone, +3 more.
Search the ui.cuelark.com shadcn/ui registry (React components, blocks, themes) and get the shadcn CLI install command for each match.
Inputs: query (required), limit.
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.
Inputs: type (required), value (required).
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.
Inputs: doi, year, title, author.
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.
Inputs: urls (required), quote.
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105 tools: JSON repair, CSV, hashes, cron, dates, units, validators. 25 free calls.
QR codes, JSON diff/format, hashes, JWT, cron, timestamps, placeholders, flowcharts, forms, regex.
Free deterministic tools for math, data transforms, dates, text, statistics, finance, and units.
Everyday calculators and converters for AI assistants: units, dates, percentages, text, JSON.
Add one secure layer between your agents and this server.