This record as markdown: /tools/io-tinyfn-tinyfn/calculate-age-2.md
What calculate_age_2 does on TinyFn
AI agents call calculate_age_2 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 |
|---|---|---|---|
as_of | string | — | Calculate age as of date (YYYY-MM-DD) |
birthdate | string | Yes | Birthdate (YYYY-MM-DD) |
Parameters from the server's own tool schema.
Why calculate_age_2 is rated Low
This tool performs a deterministic mathematical operation (computing the difference between birthdate and current date) to derive age. It does not modify, delete, execute external commands, move money, or alter any state. It is a read-only calculation utility consistent with the server's purpose of providing 500+ deterministic tools for math and date/time operations.
From the tool's definition Tool name 'calculate_age_2' and description 'Calculate age from birthdate' indicate a pure calculation/query operation with no side effects. It retrieves a computed value from an input date.
Attacks that exploit this kind of access
The rule that runs calculate_age_2 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_age_2, this is the rule to start with:
calculate_age_2 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_age_2 call is checked against it from then on.
Questions about calculate_age_2
Calculate age from birthdate. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
calculate_age_2 accepts 2 parameters: as_of, birthdate. Required: birthdate. 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_age_2: 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_age_2 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_age_2 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_age_2. 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_age_2 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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