future_value

Calculate future value of an investment.

SERVERTinyFn SOURCEhttps://api.tinyfn.io/mcp/all/

Low RISK CLASS

Category Read

Parameters 33 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-tinyfn-tinyfn/future-value.md

WHAT IT DOES

What future_value does on TinyFn

AI agents call future_value 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
`rate`	number	Yes	Annual interest rate (percentage)
`years`	integer	Yes	Number of years
`present_value`	number	Yes	Present value

Parameters from the server's own tool schema.

RISK

Why future_value is rated Low

This tool performs a read-only financial calculation (future value formula) without moving money, creating records, or modifying any state. It is a math/computation tool consistent with the server's description of '500+ deterministic tools.' No financial transactions are committed.

From the tool's definition 'Calculate future value of an investment' — purely a deterministic mathematical computation with no side effects

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs future_value 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 future_value, this is the rule to start with:

future_value Allowed

future_value is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "future_value": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every future_value call is checked against it from then on.

FAQ

Questions about future_value

What does the future_value tool do? +

Calculate future value of an investment. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.

What parameters does future_value accept? +

future_value accepts 3 parameters: rate, years, present_value. Required: rate, years, present_value. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on future_value? +

Register the TinyFn MCP server in PolicyLayer and add a rule for future_value: 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.

What risk level is future_value? +

future_value is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit future_value? +

Yes. Add a rate_limit block to the future_value 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.

How do I block future_value completely? +

Set action: deny in the PolicyLayer policy for future_value. 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.

What MCP server provides future_value? +

future_value 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.

KEEP EXPLORING

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