Project Gumball

Name: Project Gumball
Author: com.gumballtools

MCP serverMCP

One MCP server exposing every tool in the Gumball portfolio.

Listed on its own since 2026-09-27. Until then it was part of cron-translator, where its earlier checks remain.

by com.gumballtoolsrepository ↗homepage ↗v0.1.0

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Observed by Wellknown

Evidence

Everything here was measured by our prober or read from a registry. Nothing is self-reported.

30-day availability48/48 checks ok

when	check	result	http	latency	detail
4 h ago	mcp initialize	ok	200	159 ms	server gumball 0.1.0 · protocol 2025-06-18 · 25 tools
10 h ago	mcp initialize	ok	200	190 ms	server gumball 0.1.0 · protocol 2025-06-18 · 25 tools
17 h ago	mcp initialize	ok	200	144 ms	server gumball 0.1.0 · protocol 2025-06-18 · 25 tools
25 h ago	mcp initialize	ok	200	169 ms	server gumball 0.1.0 · protocol 2025-06-18 · 25 tools
31 h ago	mcp initialize	ok	200	174 ms	server gumball 0.1.0 · protocol 2025-06-18 · 25 tools
2 d ago	mcp initialize	ok	200	179 ms	server gumball 0.1.0 · protocol 2025-06-18 · 25 tools
2 d ago	mcp initialize	ok	200	208 ms	server gumball 0.1.0 · protocol 2025-06-18 · 25 tools
2 d ago	mcp initialize	ok	200	151 ms	server gumball 0.1.0 · protocol 2025-06-18 · 25 tools
2 d ago	mcp initialize	ok	200	212 ms	server gumball 0.1.0 · protocol 2025-06-18 · 25 tools
3 d ago	mcp initialize	ok	200	183 ms	server gumball 0.1.0 · protocol 2025-06-18 · 25 tools

Tools observed via MCP handshake

cron_explain — Translate a cron expression into plain English, list upcoming run times in a timezone, and report the gotchas that make schedules misfire: day-of-month/day-of-w
cron_build — Convert an English schedule description into a cron expression. Rule-based, not a language model: it refuses phrases outside its grammar rather than guessing, a
cron_next_runs — Lists the next run times for a cron expression in a specific timezone, with no prose. Use it when the only question is "when does this next fire" — whether a jo
json_to_types — Convert a JSON sample into TypeScript interfaces and a matching Zod schema. Merges EVERY array element into a union rather than typing from the first, keeps opt
regex_explain — Explain a regular expression in plain English and detect catastrophic backtracking. ALWAYS call this before putting a pattern where it will run against untruste
timezone_convert — Convert a wall-clock time between IANA zones. Returns null when the local time DOES NOT EXIST because a daylight-saving jump skipped it, and both candidates whe
color_analyse — Convert a colour between hex, RGB, HSL, OKLCH, CMYK, and CSS names, and derive complementary, analogous, triadic, split-complementary and monochromatic harmonie
vocab_draw — Draw words-in-context practice questions from a curated bank. The response deliberately contains NO answers and NO explanations, so you can quiz someone without
vocab_check — Mark an attempt and get the teaching content: whether it was right, which option was correct, why it fits, and why EVERY distractor fails. Read the distractor r
body_metrics — Compute BMI, energy expenditure, and protein targets from height and weight. Height and weight MUST carry units — a bare number is REFUSED rather than guessed,
due_date — Estimate a due date from a last menstrual period, a known conception date, an IVF transfer, or an ultrasound measurement. Gestational age is counted from the LA
round_cash_total — Settle a transaction: exact subtotal, tax computed on that exact subtotal, then round the final total to the nearest nickel — and ONLY for cash. Card, EFT and g
rounding_impact — Compute the mean rounding delta per cash transaction across a price list. Answers "does rounding make retailers money" with arithmetic rather than a guess: symm
price_band — For a list price and a tax rate, finds every nearby list price that settles to the SAME cash total, and the highest one. Use it for "what should I charge" and "
offside — Returns a verdict plus every step taken. THREE verdicts, not two: offside, onside, and no-offside-offence — the last is real and common, because in soccer an of
offside_rule_contrast — Returns the structural differences between soccer offside and hockey offside, one dimension at a time. Use it when someone asks how the two compare, and — more
check_digit_run — Checks the check digit on an IBAN (ISO 7064 MOD 97-10), ISBN-10, ISBN-13, EAN-13, UPC-A, or a Luhn-checked card number. When the checksum fails it searches for
amortize_schedule — Returns the full row-by-row schedule: per-period interest, scheduled principal, any extra principal, PMI, payment and running balance. Handles monthly or daily
iso_week_run — Converts calendar dates to ISO 8601 week-numbering dates and back, in either direction, and reports how many weeks an ISO year has. Use it whenever a date must
validate_json — Validates a JSON document and reports every problem in one pass with a 1-based line and column, a stable rule code and a fix hint. Reports the three things JSON
validate_yaml — Validates a YAML document, including the values that mean different things to different loaders — found by resolving each unquoted scalar under both spec versio
validate_xml — Validates XML for well-formedness, namespace correctness and entity-based attacks. Catches four classes of invalid XML that ordinary well-formedness checkers ac
validate_csv — Validates CSV against RFC 4180 and reports ragged rows individually with both field counts, because "row 4813 has 6 fields, the header has 5" is the entire answ
validate_auto — Detects whether a payload is JSON, YAML, XML or CSV, then validates it. Use it for a file with no extension, a clipboard paste, or a response body with an unhel
equation_steps_run — Solves a linear or quadratic equation in one variable and returns every step: expanding parentheses, combining like terms, moving terms across the equals sign,

Project Gumball

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