return_on_investment
Calculate Return on Investment (ROI).
This record as markdown: /tools/io-tinyfn-tinyfn/return-on-investment.md
What return_on_investment does on TinyFn
AI agents call return_on_investment 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 |
|---|---|---|---|
cost | number | Yes | Cost of investment |
gain | number | Yes | Gain from investment |
Parameters from the server's own tool schema.
Why return_on_investment is rated Low
This tool performs a read-only financial calculation. It retrieves or computes data (ROI metrics) based on input parameters without modifying, creating, deleting, or executing any operations. While it involves financial concepts, it does not move money, commit financial obligations, or trigger external financial systems.
From the tool's definition The tool 'return_on_investment' calculates Return on Investment (ROI), a deterministic mathematical computation.
Attacks that exploit this kind of access
The rule that runs return_on_investment 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 return_on_investment, this is the rule to start with:
return_on_investment 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 return_on_investment call is checked against it from then on.
Questions about return_on_investment
Calculate Return on Investment (ROI). It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
return_on_investment accepts 2 parameters: cost, gain. Required: cost, gain. 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 return_on_investment: 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.
return_on_investment 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 return_on_investment 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 return_on_investment. 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.
return_on_investment 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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