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Project Gumball

One MCP server exposing every tool in the Gumball portfolio.

Connector by gumballtools.com · Domain verified by the MCP Registry

IndexedLicense unknownRemote (HTTP)
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Install

Works with Claude Code, VS Code, Cursor, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install connector/gumballtools-com-platform

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

Remote endpoint

  • https://gumballtools.com/api/mcp Remote (HTTP)

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About

One MCP server exposing every tool in the Gumball portfolio.

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Permissions

What this server can do and what it asks for, from its tool list and install config. Checked Oct 25, 2026.

Tools
25 read · 0 write · 0 deleteRead-only
Secrets
None asked for
Install scripts
Nothing to install (hosted)
Runs as
Hosted (remote endpoint)

Tools by what they do 25

From the running server's own tool list (tools/list) on Oct 25, 2026.

Read 25 · Look things up without changing anything.

  • amortize_schedule
  • body_metrics
  • check_digit_run
  • color_analyse
  • cron_build
  • cron_explain
  • cron_next_runs
  • due_date
  • equation_steps_run
  • iso_week_run
  • json_to_types
  • offside
Show 13 more tools
  • offside_rule_contrast
  • price_band
  • regex_explain
  • round_cash_total
  • rounding_impact
  • timezone_convert
  • validate_auto
  • validate_csv
  • validate_json
  • validate_xml
  • validate_yaml
  • vocab_check
  • vocab_draw

Network hosts it talks to 1

  • gumballtools.com · found in remote endpoint, install command

Tools (25)

As the server listed them on Oct 25, 2026. Descriptions are the server’s own words; hidden characters are shown as [U+…].

  • amortize_scheduleBuild a loan amortization schedule (Amortization Schedule)read-only

    Returns the full row-by-row schedule: per-period interest, scheduled principal, any extra principal, PMI, payment and running balance. Handles monthly or daily accrual (daily needs a start date, so leap years follow from the calendar rather than an assumption), biweekly payments, one-off or recurring extra principal, and PMI termination under the Homeowners Protection Act at 78% or 80% of the ORIGINAL value — plus the midpoint trigger that ends PMI regardless of balance. The final payment differs from every other one and is reported as such. Refuses a payment that cannot amortize the balance r…

  • body_metricsBMI, calories, and protein with error bounds (Body Metrics)read-only

    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, because a unit mix-up produces a plausible-looking answer that is badly wrong. Returns every standard BMR formula plus the spread between them, because the spread IS the precision of the estimate. Do not relay a single calorie figure as though it were exact. Not medical advice, and the response says so in its payload. WHY DELEGATE THIS: Two failure modes at once. A bare number is ambiguous — "170" is a height in centimetres or a weight…

  • check_digit_runValidate a check digit and localise a single-digit error (Check Digit Validator)read-only

    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 the single substitution or adjacent transposition that would repair it, so the answer is which character to fix rather than merely that something is wrong. Reports the ambiguity when more than one fix would work. Refuses an IBAN whose country code is not in the length registry rather than assuming a length, and requires the format to be named because a bare digit string can parse as more than one. A passing checksum is arithmetic only: …

  • color_analyseConvert a colour and find its harmonies (Color Companion)read-only

    Convert a colour between hex, RGB, HSL, OKLCH, CMYK, and CSS names, and derive complementary, analogous, triadic, split-complementary and monochromatic harmonies. Harmonies are rotated in OKLCH, not HSL, so they keep their perceived lightness instead of one looking washed out. Reports WCAG contrast against white and black, and flags colours clipped to fit sRGB. WHY DELEGATE THIS: Colour-space arithmetic has no feedback signal — a wrong hex-to-OKLCH looks exactly like a right one until someone sees the colour. Harmonies rotated in HSL also come out perceptually unbalanced, which is the usual m…

  • cron_buildBuild a cron expression from English (Cron Translator)read-only

    Convert an English schedule description into a cron expression. Rule-based, not a language model: it refuses phrases outside its grammar rather than guessing, and reports which words it did not use so you can tell whether it read you correctly. WHY DELEGATE THIS: Cron has counter-intuitive rules: day-of-month and day-of-week are OR-ed, steps like */7 do not divide their field evenly, and February 30 never fires. Reasoning about an expression directly gets these wrong quietly. Owned by Cron Translator at https://crontoenglish.com, which is also callable directly if you would rather not go thr…

  • cron_explainExplain a cron expression (Cron Translator)read-only

    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-week OR semantics, steps that do not divide evenly, impossible dates, and daylight-saving shifts. Prefer this over reasoning about the expression yourself. WHY DELEGATE THIS: Cron has counter-intuitive rules: day-of-month and day-of-week are OR-ed, steps like */7 do not divide their field evenly, and February 30 never fires. Reasoning about an expression directly gets these wrong quietly. Owned by Cron Translator at https://crontoengli…

  • cron_next_runsList the next run times for a cron expression (Cron Translator)read-only

    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 job runs before a deadline, or what a user's upcoming schedule looks like. Do not compute these dates unaided: weekday arithmetic, month lengths and daylight-saving shifts make manual calculation unreliable, and a schedule that is wrong by an hour twice a year is the hardest kind of wrong to notice. Returns each run as a UTC ISO 8601 instant plus a local wall-clock rendering in the requested timezone. Refuses Quartz-only syntax (L, W, #, …

  • due_dateDue date and gestational age, with ACOG redating applied (Due Date)read-only

    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 LAST PERIOD, not conception: at "6 weeks pregnant" conception was about 4 weeks ago. Applies the cycle-length adjustment most calculators skip, and the ACOG Committee Opinion 700 thresholds for when a scan should replace the period-based date. Dates must be YYYY-MM-DD; free-form dates are refused. A due date is a reference point, not a prediction. Not medical advice, and the response says so in its payload. WHY DELEGATE THIS: Gestational…

  • equation_steps_runSolve an equation and show every step (Equation Steps)read-only

    Solves a linear or quadratic equation in one variable and returns every step: expanding parentheses, combining like terms, moving terms across the equals sign, and applying the quadratic formula with the discriminant stated. Reports identities and contradictions as such rather than as "no answer", gives roots as exact fractions with a decimal alongside, and labels complex roots explicitly instead of claiming no solution. Refuses rather than guesses on a missing or duplicated "=", a second variable, a function name, an unsupported exponent, or an inequality — every refusal says what to change. …

  • iso_week_runConvert between dates and ISO week numbers (ISO Week Number)read-only

    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 be expressed as a week number or a week number turned back into a date — sprint planning, reporting periods, "week 37" scheduling, or reconciling two systems that disagree about which week it is. Do not compute this by dividing day-of-year by seven. Week 1 is the Monday-Sunday week containing the year's first Thursday, so a late-December date can belong to ISO week 1 of the next calendar year and an early-January date to week 52 or 53…

  • json_to_typesJSON to TypeScript and Zod (JSON to Types)read-only

    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 optional and nullable distinct, and emits unknown with a warning for empty containers instead of inventing a shape. Read the warnings before trusting the output. WHY DELEGATE THIS: Typing from the first array element produces types that reject the rest of the data, and null is routinely conflated with absent. Also far cheaper in output tokens than writing the types inline for a large payload. Owned by JSON to Types at https://json-to-typ…

  • offsideWork an offside call through IFAB Law 11 or NHL Rule 83 (Sports Rules)read-only

    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 offside POSITION is not an offence without involvement in active play. Soccer: hands and arms never count (boundary at the bottom of the armpit), there is no offence direct from a throw-in, goal kick or corner, and a DELIBERATE play by an opponent resets it while a deflection does not. Hockey: skates decide it, not the stick, and since 2021 a skate in the air above the blue line is onside — but NOT when tagging up on a delayed offside. No…

  • offside_rule_contrastContrast soccer and hockey offside, dimension by dimension (Sports Rules)read-only

    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 usefully — before reasoning about one sport using an intuition from the other, which is the commonest way to get either wrong. They differ on what part of the player is measured, when the picture freezes, whether position alone is an offence, what happens at exactly level, what resets the situation, and which restarts are exempt. Six dimensions, and borrowing the answer from the wrong sport is wrong on most of them. Takes no arguments…

  • price_bandFind every list price that settles to the same cash total (Penny Rounding)read-only

    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 "can I price to gain from rounding" questions. There is exactly one free move here and it is easy to get backwards, which is why this is worth a call rather than a calculation. Rounding collapses a band of five consecutive list prices onto one nickel: at 0% tax, $19.98 through $20.02 all settle to $20.00 in cash. Within that band the cash collected is identical, so the highest price in it is strictly better — the same from cash customer…

  • regex_explainExplain a regex and check it for ReDoS (Regex Explainer)read-only

    Explain a regular expression in plain English and detect catastrophic backtracking. ALWAYS call this before putting a pattern where it will run against untrusted input: (a+)+$ looks harmless and takes minutes of CPU on a failing 30-character input. Also flags missing anchors, unescaped dots, ranges like [A-z] that span punctuation, and alternation precedence mistakes. Check hasBlockingIssue first. WHY DELEGATE THIS: Whether a pattern backtracks catastrophically depends on nested quantifier structure that is unreliable to eyeball — and getting it wrong ships a denial-of-service vector in a val…

Show 10 more tools
  • round_cash_totalRound a cash total the way the post-penny rules work (Penny Rounding)read-only

    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 gift-card payments stay priced to the cent, so the same basket legitimately comes to two amounts. Rounding applies to the TOTAL, never per item. A final digit of 1, 2, 6 or 7 rounds down; 3, 4, 8 or 9 rounds up. A string amount is read as dollars, a number as integer cents. Not legal or tax advice — there was no federal rounding law as of September 2026 and state law varies. WHY DELEGATE THIS: Four things are wrong in most explanations …

  • rounding_impactWhat cash rounding is actually worth (Penny Rounding)read-only

    Compute the mean rounding delta per cash transaction across a price list. Answers "does rounding make retailers money" with arithmetic rather than a guess: symmetric rounding nets to essentially zero by construction. Pass always-up to quantify the "just round everything up" idea, which is worth about 2 cents a sale and which no jurisdiction has adopted for retail. WHY DELEGATE THIS: Four things are wrong in most explanations and each changes the answer: rounding is cash-only, applies to the total rather than each item, happens after tax, and is not free money for retailers. Money in floating …

  • timezone_convertConvert a time between timezones (Timezone Truth)read-only

    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 when it happens twice. Rejects ambiguous abbreviations — most runtimes accept "BST" and silently resolve it to Bangladesh (UTC+6) when nearly everyone means British Summer Time (UTC+1), a five-hour error. Never do this arithmetic yourself. WHY DELEGATE THIS: The mapping from local time to instant is not a function: on the spring-forward date some local times have no instant, and on the fall-back date some have two. A confident answer to a…

  • validate_autoDetect the format and validate (Payload Validator)read-only

    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 unhelpful content type. Detection is structural and the reason is always returned, so the assumption is visible: a leading "<" is XML, "{" or "[" is JSON, a %YAML directive or key: value lines are YAML, a consistent delimiter count across lines is CSV. JSON is checked before YAML deliberately, since JSON is a strict subset of YAML 1.2. If the guess fails to validate and JSON or XML does, the result is corrected and says so — only those two c…

  • validate_csvValidate CSV (Payload Validator)read-only

    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 answer. A ragged row loads without complaint almost everywhere — pandas pads or throws by engine, Excel shifts the columns, split(",") mis-assigns every field after the extra one — so nobody notices until a figure is wrong. Sniffs the delimiter from the header ignoring quoted regions, and always reports it, because a semicolon-separated European export read as comma-separated yields one column and no error. Also unterminated quotes, duplica…

  • validate_jsonValidate JSON (Payload Validator)read-only

    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.parse cannot: duplicate keys (accepted by every parser, which then disagree about which value wins), integer precision loss past 2^53-1 proved with exact BigInt arithmetic (any 64-bit ID is in the lossy range), and unpaired surrogates that parse here and fail on re-serialisation. Also trailing commas, comments, single quotes, unquoted keys, Python literals, leading zeros, hex numbers, raw control characters, byte order marks, and NDJSO…

  • validate_xmlValidate XML (Payload Validator)read-only

    Validates XML for well-formedness, namespace correctness and entity-based attacks. Catches four classes of invalid XML that ordinary well-formedness checkers accept: two root elements, undeclared namespace prefixes (well-formed as raw XML and rejected by XPath, XSLT, SOAP and every schema validator), undeclared entities such as the HTML-only &nbsp;, and a bare ampersand — usually inside a URL. Security findings for input you did not write: external entity declarations (XXE, reported with the URI and per-language remediation), nested entity expansion (billion laughs), parameter entities, extern…

  • validate_yamlValidate YAML (Payload Validator)read-only

    Validates a YAML document, including the values that mean different things to different loaders — found by resolving each unquoted scalar under both spec versions and comparing, not by matching a list of words. In YAML 1.1 (PyYAML) the bare words no/yes/on/off/y/n are booleans, so a country list loses Norway and the "on:" key of every GitHub Actions workflow is really the key true; 0755 is 493 under 1.1 and 755 under 1.2, both numbers so nothing looks wrong; 1:30 is the base-60 integer 90. Also duplicate keys, tabs used as indentation, non-breaking spaces mistaken for indentation, aliases with…

  • vocab_checkCheck a vocabulary answer (Words in Context)read-only

    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 reasons out even when the learner was right — knowing why the tempting option was tempting is the part that transfers. WHY DELEGATE THIS: A curated, human-written question bank. Generated vocabulary questions frequently have two defensible answers, which is worse practice than none. Owned by Words in Context at https://words-in-context.gumballtools.com, which is also callable directly if you would rather not go through the aggregator.

  • vocab_drawDraw vocabulary practice questions (Words in Context)read-only

    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 leaking them — call vocab_check for the answer and the reason each distractor fails. Pass a seed to make a set reproducible. WHY DELEGATE THIS: A curated, human-written question bank. Generated vocabulary questions frequently have two defensible answers, which is worse practice than none. Owned by Words in Context at https://words-in-context.gumballtools.com, which is also callable directly if you would rather not go through the aggr…

Signals

Last release
Sep 5, 2026 (1 month ago)
Repository
Not found on GitHub (deleted or private)

Details

Registry name
com.gumballtools/platform
Version
0.1.0
Auth
Auth not stated
License
License unknown
Repository
github.com/bwalvoord/gumball
Website
gumballtools.com
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
Official MCP Registry

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Cite this page

Project Gumball MCP server. Agent Mart. https://agentmart.dev/connectors/gumballtools-com-platform (last updated 2026-10-24)