This record as markdown: /tools/io-tinyfn-tinyfn/calculate-macros.md
What calculate_macros does on TinyFn
AI agents call calculate_macros 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 |
|---|---|---|---|
goal | string | — | Goal: lose, maintain, gain |
calories | integer | Yes | Daily calorie target |
Parameters from the server's own tool schema.
Why calculate_macros is rated Low
This tool performs a read-only calculation of macronutrient targets (carbohydrates, proteins, fats) based on input parameters. It has no side effects, does not modify any state, and does not execute external code or commands. Misuse by an AI agent would only produce incorrect nutritional advice, which has minimal blast radius. Classified as Read with low severity.
From the tool's definition Tool name 'calculate_macros' and description 'Calculate macronutrient targets' indicate a computation that retrieves or derives nutritional data based on inputs.
Attacks that exploit this kind of access
The rule that runs calculate_macros 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_macros, this is the rule to start with:
calculate_macros 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_macros call is checked against it from then on.
Questions about calculate_macros
Calculate macronutrient targets. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
calculate_macros accepts 2 parameters: goal, calories. Required: calories. 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_macros: 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_macros 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_macros 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_macros. 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_macros 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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