derangement_calc
Count and optionally enumerate derangements (permutations with no fixed points).
This record as markdown: /tools/io-github-malamutemayhem-unclick-mcp-server/derangement-calc.md
What derangement_calc does on UnClick
AI agents call derangement_calc to retrieve information from UnClick 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 | number | Yes | Size of permutation (1-20) |
enumerate | boolean | — | List all derangements (n <= 8) |
Parameters from the server's own tool schema.
Why derangement_calc is rated Low
This tool performs a mathematical computation — counting and listing derangements. It is purely a read/query operation with no side effects, no data modification, and no external system interaction. Misuse potential is minimal.
From the tool's definition Count and optionally enumerate derangements (permutations with no fixed points)
Attacks that exploit this kind of access
The rule that runs derangement_calc safely
PolicyLayer is an MCP gateway: it sits between your AI agents and UnClick, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For derangement_calc, this is the rule to start with:
derangement_calc 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 UnClick, apply this rule, and every derangement_calc call is checked against it from then on.
Questions about derangement_calc
Count and optionally enumerate derangements (permutations with no fixed points). It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
derangement_calc accepts 2 parameters: n, enumerate. Required: n. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for derangement_calc: 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 UnClick. Nothing to install.
derangement_calc 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 derangement_calc 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 derangement_calc. 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.
derangement_calc is provided by the UnClick MCP server (@unclick/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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