variance_calc
Calculate population/sample variance, standard deviation, median, range, and coefficient of variation.
This record as markdown: /tools/io-github-malamutemayhem-unclick-mcp-server/variance-calc.md
What variance_calc does on UnClick
AI agents call variance_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 |
|---|---|---|---|
values | array | Yes | Array of numeric values (at least 2). |
Parameters from the server's own tool schema.
Why variance_calc is rated Low
This tool retrieves and computes statistics from input values without creating, modifying, deleting, or executing external operations. It is a read-only analytical function with no blast radius if misused by an AI agent.
From the tool's definition Tool performs statistical calculations on provided data: 'Calculate population/sample variance, standard deviation, median, range, and coefficient of variation.' These are pure computational operations with no data persistence, modification, external system…
Attacks that exploit this kind of access
The rule that runs variance_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 variance_calc, this is the rule to start with:
variance_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 variance_calc call is checked against it from then on.
Questions about variance_calc
Calculate population/sample variance, standard deviation, median, range, and coefficient of variation. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
variance_calc accepts 1 parameter: values. Required: values. 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 variance_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.
variance_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 variance_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 variance_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.
variance_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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