This record as markdown: /tools/io-tinyfn-tinyfn/factorial.md
What factorial does on TinyFn
AI agents call factorial 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 |
|---|---|---|---|
number | integer | Yes | The number (0-170) |
Parameters from the server's own tool schema.
Why factorial is rated Low
This is a deterministic mathematical function that reads input and returns a computed result. It performs no I/O, makes no modifications to any state, executes no external code, and has no financial implications. It is purely a read-only computation operation, consistent with the sibling tools on this server (math, conversion, validation, hashing, encoding operations).
From the tool's definition Tool name 'factorial' and description 'Calculate the factorial of a number' indicate a pure mathematical computation with no side effects, no data modification, and no external operations.
Attacks that exploit this kind of access
The rule that runs factorial 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 factorial, this is the rule to start with:
factorial 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 factorial call is checked against it from then on.
Questions about factorial
Calculate the factorial of a number. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
factorial accepts 1 parameter: number. Required: number. 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 factorial: 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.
factorial 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 factorial 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 factorial. 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.
factorial 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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