subtraction_grundy
The Grundy value of a heap of n in the subtraction game with the given move sizes. With moves 1, 2, and 3, the value of n is n mod 4. n runs from 0 to 500, and there are 1 to 8 moves, each from 1 to 100. Price: $0.001 USDC per successful call (x402, Solana). Same tool over HTTPS: POST https://sco...
This record as markdown: /tools/com-it-scorptech-x402/subtraction-grundy.md
What subtraction_grundy does on ScorpTech x402 API
AI agents call subtraction_grundy to retrieve information from ScorpTech x402 API without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
n | integer | Yes | |
moves | array | Yes |
Parameters from the server's own tool schema.
Why subtraction_grundy is rated Low
Even though subtraction_grundy only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs subtraction_grundy safely
PolicyLayer is an MCP gateway: it sits between your AI agents and ScorpTech x402 API, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For subtraction_grundy, this is the rule to start with:
subtraction_grundy is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect ScorpTech x402 API, apply this rule, and every subtraction_grundy call is checked against it from then on.
Questions about subtraction_grundy
The Grundy value of a heap of n in the subtraction game with the given move sizes. With moves 1, 2, and 3, the value of n is n mod 4. n runs from 0 to 500, and there are 1 to 8 moves, each from 1 to 100. Price: $0.001 USDC per successful call (x402, Solana). Same tool over HTTPS: POST https://scorptech.it.com/api/x402/v1/subtraction-grundy. It is categorised as a Read tool in the ScorpTech x402 API MCP Server, which means it retrieves data without modifying state.
subtraction_grundy accepts 2 parameters: n, moves. Required: n, moves. The full parameter table on this page comes from the server's own tool schema.
Register the ScorpTech x402 API MCP server in PolicyLayer and add a rule for subtraction_grundy: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches ScorpTech x402 API. Nothing to install.
subtraction_grundy is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the subtraction_grundy rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for subtraction_grundy. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
subtraction_grundy is provided by the ScorpTech x402 API MCP server (https://scorptech.it.com/api/x402/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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