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Number Sprint

A real arithmetic speed-game plus a genuine Countdown-style numbers round

Unify Dynamics LLC

Documentation
Tools8read-only
Sign-inNoneno account, no key
Data keptNoneprocessed in memory
PriceFreeoptional Pro limits
StatusLiveMCP + REST
Works withMCP · RESTany agent

Try asking

Real questions, and the tools your agent calls to answer them.

Let's do a math sprint
Tools called
new_session
Give me another problem
Tools called
new_problem
The answer is 75
Tools called
submit_answer
What's my streak and accuracy?
Tools called
sprint_stats
Give me a Countdown numbers round
Tools called
countdown_round
Can you make 952 from 100, 75, 6, 3, 8, 2?
Tools called
submit_countdown_solution
Show me a solution
Tools called
solve_countdown
How does this game work?
Tools called
rules_info

About

Number Sprint is a fully local, playable arithmetic game with two modes. Sprint: new_problem generates a real arithmetic problem scaled by difficulty; submit_answer grades it against the real computed result and sprint_stats reports exact streak/accuracy. Countdown: countdown_round draws six real Countdown-style tiles and a (guaranteed-reachable, if auto-generated) target; submit_countdown_solution safely parses and evaluates your expression -- checking number usage and the classic positive-whole-number rule -- against the target; solve_countdown runs a real combinatorial solver for an example solution or closest reachable value. rules_info explains both modes. Stateless -- no server-side session storage, the caller passes state between calls. Keyless; fully local; zero upstream calls; nothing stored.

Sources: Original, hand-authored content. Fully local, zero upstream calls.

Privacy

The publisher, Unify Dynamics LLC, states that tool inputs are processed in memory and not retained.

Data not collectedNo account, no profile, no stored prompts or results.
Privacy policyTerms

What it can do

8 tools, grouped by job. Every one is read-only or compute-only.

OpenAPI
Sprint4 tools
  • New sessionStart a new Number Sprint session (resets stats) and generate its first arithmetic problem.
  • New problemGenerate a fresh sprint-mode arithmetic problem, keeping streak/accuracy stats intact.
  • Submit answerSubmit an answer to the current sprint problem; grades it against the real computed result and updates exact streak/accuracy stats.
  • Sprint statsReport exact sprint-mode stats: correct/incorrect counts, accuracy percentage, current and best streak.
Countdown3 tools
  • Countdown roundStart a Countdown-style numbers round: draws 6 real Countdown tiles (large 25/50/75/100 plus small 1-10, two of each) and a target, unless you…
  • Submit countdown solutionSAFELY parse and evaluate your expression (no eval()) against the current Countdown round: checks it only uses the drawn numbers (each at most as…
  • Solve countdownRun the real combinatorial solver on the current Countdown round and reveal an exact solution (or the closest reachable value if no exact one exists).
Info1 tools
  • Rules infoExplain Number Sprint's sprint and Countdown modes, scoring, and the safe expression evaluator.

Information

PublisherUnify Dynamics LLC
CategoryGames & entertainment
LanguagesEnglish
Built forGlobal
CompatibilityAny MCP client · any agent · REST
Version0.1.0
MCP endpointhttps://numbersprint.connectorbay.com/mcp
REST APIopenapi.json
SupportGet help · Status
CountryWorldwide

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Documentation

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What Number Sprint is for

A fully local, PLAYABLE arithmetic speed-game engine with two modes: fast mental-math sprints, and a real Countdown-style "numbers round" (reach a target from six drawn numbers using +, -, *, /).

What it does

Sprint mode: new_problem generates a genuine arithmetic problem whose operand size and operation mix scale with difficulty; division problems are always constructed so the result is an exact integer. submit_answer grades your answer against the real computed result and updates exact streak/accuracy stats (sprint_stats).

Countdown mode: countdown_round draws six real Countdown-style tiles (0-4 "large" tiles from {25,50,75,100}, the rest "small" tiles from 1-10 with two of each, exactly like the real game) and a target; an auto-generated target is guaranteed reachable by the real solver. submit_countdown_solution SAFELY parses and evaluates your claimed expression -- built on Python's ast module with a strict allow-list of node types, never eval() -- checking that it only uses the drawn numbers (each at most as many times as it was drawn), that every intermediate result stays a positive whole number (the classic rule), and finally comparing the value to the target. solve_countdown runs a real recursive combinatorial search over every way to combine the six numbers and returns a genuine example solution (or the closest reachable value if the target truly can't be hit exactly).

How state works

There is no server-side session storage. Every call takes the full session state (the exact object returned by the previous call) and returns a new one. The hidden correct answer/target lives inside state -- don't print the raw state to the player before they've answered.

What it is not

Not a decorative calculator that trusts whatever you type -- the Countdown evaluator independently checks number usage, operation legality, and intermediate-value rules before ever comparing to the target, and never runs your expression through Python's eval().

Privacy policy

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Number Sprint — Privacy Policy

Effective 28 September 2026. Unify Dynamics LLC ("we", "us"), Menlo Park, California.

What Number Sprint is. Number Sprint is a connector (an MCP server and REST API) that AI assistants and personal agents call on your behalf to run local arithmetic-sprint and Countdown-style numbers games — generating problems, checking answers and expressions, and computing stats.

What we receive. The arguments of each tool call — the session state you (via your assistant) pass back on every call, your answers and expressions, and the technical headers needed to serve the request (an IP address or a client identifier supplied by the assistant, and a Pro API key if you have one) — plus standard server logs.

Everything is computed locally and nothing is stored. Number Sprint has no database and no server-side session storage of any kind. The entire session state lives only in your conversation with your assistant, which passes it back to us on each call and receives an updated copy in the response. We do not persist it, log it, or use it for anything beyond computing that one response. No request is forwarded to any third party — there is no upstream call at all.

What we do not receive or store. We do not receive your name, your conversation with the assistant beyond the bare session-state argument, or anything else about you. Each request is answered independently. Rate-limit counters (a client identifier and timestamps) are held in memory for at most 24 hours. Hosting-provider access logs (IP addresses and request paths, not request bodies) are retained for up to 30 days for security and abuse prevention.

Sub-processors. None — computation is entirely local to this server. Hosting: Vercel (United States regions).

Legal bases and your rights. Our processing is necessary to provide the service you request through your assistant. Because we store no personal data beyond short-lived logs, requests to access, correct or delete personal data are usually satisfied automatically; you can still contact agent@connectorbay.com and we will respond within 30 days. We do not sell or share personal information and do not use your data to train models.

Children. Number Sprint is a general-audience service operated by the adult using the assistant.

Changes. We will post changes here with a new effective date.

Terms of service

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Number Sprint — Terms of Service

Effective 28 September 2026. These terms govern use of the Number Sprint connector ("the Service") operated by Unify Dynamics LLC ("we", "us").

  1. The Service. Number Sprint is a stateless, playable arithmetic speed-game engine plus a Countdown- style numbers-round mode, accessed through an AI assistant or directly over MCP or HTTP. There is no server-side session storage: the caller holds and passes session state between calls.
  2. Entertainment only. Number Sprint is provided for entertainment and casual educational purposes. Nothing in it constitutes professional or academic advice.
  3. Acceptable use. Automated use within the published rate limits is welcome. Do not use the Service to disrupt, overload, or reverse-engineer the underlying infrastructure.
  4. Availability. The Service is provided "as is" without warranty. We may change, limit, or discontinue it at any time.
  5. Data. Our Privacy Policy describes what we process. In short: session state is computed statelessly from what you send us and nothing is stored.
  6. Pro keys. Optional Pro API keys are issued at our discretion, are personal to the holder, and may be revoked for abuse.
  7. Liability. To the fullest extent permitted by law, Unify Dynamics LLC is not liable for any loss, injury, or damage arising from use of, or reliance on, the Service. Our total liability is limited to US $100.
  8. Governing law. California law; venue in San Mateo County, California.
  9. Contact. Unify Dynamics LLC · agent@connectorbay.com · https://connectorbay.com/numbersprint

Support

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Number Sprint support

Email agent@connectorbay.com. We answer within two business days.

When you report a problem, include the question you asked your agent, roughly when, and which agent you used (for example Claude, ChatGPT or Gemini). Never send us passwords, account numbers or ID numbers. Number Sprint never asks for them.

Get Number Sprint

Free · No sign-in · Read-only

Streamable HTTP, stateless, no authentication. Paste the endpoint into any MCP-capable agent.

https://numbersprint.connectorbay.com/mcp
{
  "mcpServers": {
    "numbersprint": {
      "type": "http",
      "url": "https://numbersprint.connectorbay.com/mcp"
    }
  }
}