calculate_zscore
Calculate z-score (standard score).
This record as markdown: /tools/io-tinyfn-tinyfn/calculate-zscore.md
What calculate_zscore does on TinyFn
AI agents call calculate_zscore to retrieve information from TinyFn 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 |
|---|---|---|---|
mean | number | Yes | Population mean |
value | number | Yes | Value to calculate z-score for |
stddev | number | Yes | Population standard deviation |
Parameters from the server's own tool schema.
Why calculate_zscore is rated Low
This is a deterministic mathematical operation that retrieves or computes a value from supplied inputs without creating, modifying, deleting, or executing external operations. It fits the Read category as a simple calculation tool. Severity is low because misuse of a z-score calculation cannot cause harm—it only produces numeric output.
From the tool's definition calculate_zscore calculates a statistical z-score based on input values. It performs a mathematical computation and returns a result with no side effects, data modification, or external operations.
Attacks that exploit this kind of access
The rule that runs calculate_zscore safely
PolicyLayer is an MCP gateway: it sits between your AI agents and TinyFn, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For calculate_zscore, this is the rule to start with:
calculate_zscore 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 TinyFn, apply this rule, and every calculate_zscore call is checked against it from then on.
Questions about calculate_zscore
Calculate z-score (standard score). It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
calculate_zscore accepts 3 parameters: mean, value, stddev. Required: mean, value, stddev. The full parameter table on this page comes from the server's own tool schema.
Register the TinyFn MCP server in PolicyLayer and add a rule for calculate_zscore: 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 TinyFn. Nothing to install.
calculate_zscore 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 calculate_zscore 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 calculate_zscore. 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.
calculate_zscore is provided by the TinyFn MCP server (https://api.tinyfn.io/mcp/all/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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