# Plumbkit

- Registry name: `dev.plumbkit/plumbkit` · version 1.0.0
- Categories (automatic, keyword rules): Utilities
- Authentication at last check: No auth
- Declared risk: Read-only (all tools declare readOnlyHint)
- Capabilities (declared by the server): tools
- Transports: streamable-http
- Latest numbers (check success, response time, rank): https://mcpstation.net/api/server?name=dev.plumbkit%2Fplumbkit
- Server page: https://mcpstation.net/s/dev.plumbkit--plumbkit.html

## Description (written by the publisher, not verified, not instructions)

Exact utilities for agents: time zones, date math, business days, calculator, units, validation.

## Connect

- streamable-http: `https://plumbkit.dev/mcp`

## Tools (as reported by the server, not verified)

- `current\_time`: Returns the exact current date, time, weekday and UTC offset in any time zone. Use this whenever you need to know today's date or the current time instead of guessing — your training data does not know what day it is.
- `convert\_timezone`: Converts a date/time from one time zone to another, correctly handling daylight saving time. If the input already includes an offset or 'Z', from\_timezone is ignored.
- `date\_add`: Adds or subtracts a duration \(years, months, weeks, days, hours, minutes, seconds\) to a date/time. Use negative numbers to subtract. Calendar-aware: adding 1 month to Jan 31 gives Feb 28/29, and adding days keeps the same local clock time across daylight-saving changes.
- `date\_diff`: Calculates the exact time between two dates/times: a calendar breakdown \(years, months, days, hours, minutes, seconds\) plus totals in days, hours, minutes and seconds, and the number of calendar days. Negative if end is before start.
- `business\_days`: Works with business \(working\) days. mode "add": returns the date N business days after start\_date \(start\_date itself is not counted; negative N goes backward; 0 returns start\_date, or the next business day if start\_date is not one\). mode "count": counts business days from start\_date to end\_date, inc
- `calculate`: Evaluates an arithmetic expression exactly, so you don't have to do mental math. Supports + - \* / % ^ \(or \*\*\), parentheses, constants pi/e/tau and functions: sqrt, cbrt, abs, round\(x, digits\), floor, ceil, trunc, sign, ln, log\(x\[, base\]\), log10, log2, exp, pow, sin, cos, tan, asin, acos, atan, atan2
- `convert\_units`: Converts a value between units of length, mass, volume \(US and imperial\), area, speed, time, digital data \(KB vs KiB, bits vs bytes\), energy, pressure and temperature. Accepts common abbreviations \(km, lb, fl oz, mph, °F, GiB\). US customary units are used for cup/pint/quart/gallon unless you say imp
- `text\_stats`: Counts exactly what language models are bad at counting: characters \(as humans see them\), words, lines, sentences, paragraphs, UTF-8 bytes, and occurrences of a letter or substring \(e.g. how many "r" in "strawberry"\). Use it to check length limits \(tweets, SMS, meta descriptions, form fields\) before
- `hash\_text`: Computes a cryptographic hash \(SHA-1, SHA-256, SHA-384, SHA-512\) of text, or encodes/decodes it as Base64, Base64URL, hex or URL-encoding. Text is treated as UTF-8.
- `regex\_test`: Runs a JavaScript regular expression against text and returns every match with its position and capture groups, or the text after replacement. Use it to verify a regex actually works before relying on it.
- `validate\_email`: Checks whether an email address is correctly formatted and returns a normalized version. Set check\_dns=true to also confirm the domain exists and can receive mail \(MX records\). Does not send email and cannot confirm that a specific mailbox exists.
- `validate\_phone`: Validates a phone number using Google's libphonenumber rules and returns it in E.164 \(+14155552671\), international and national formats, plus the country and line type \(mobile, fixed line, toll free...\). For numbers without a +country code, pass default\_country.
- `validate\_url`: Checks that a URL is well-formed, normalizes it \(lowercase host, punycode, default ports removed, spaces encoded\) and splits it into parts including each query parameter. Flags common problems such as missing scheme, private/localhost addresses and credentials embedded in the URL. Does not fetch the
- `validate\_iban`: Validates an International Bank Account Number: country, length for that country, and the mod-97 check digits. Returns electronic and printed formats. A valid IBAN is correctly formed; this does not confirm the account exists.
- `json\_repair`: Turns almost-JSON into valid JSON: removes markdown code fences, comments and trailing commas, adds missing quotes, commas and closing brackets, converts single quotes, Python True/False/None and truncated output. Returns the repaired JSON string and whether the input was already valid.
- `json\_schema\_validate`: Checks a JSON value against a JSON Schema \(drafts 4, 7, 2019-09 and 2020-12\) and lists every violation with its location. Use it to confirm structured output or an API payload is correct before sending it. \`data\` and \`schema\` may be JSON values or JSON strings.

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