calculate_markup
Calculate selling price from cost and markup.
This record as markdown: /tools/io-tinyfn-tinyfn/calculate-markup.md
What calculate_markup does on TinyFn
AI agents call calculate_markup 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 price |
markup_percent | number | Yes | Markup percentage |
Parameters from the server's own tool schema.
Why calculate_markup is rated Low
This is a deterministic mathematical function that retrieves/computes a result based on provided parameters. It performs no writes, deletions, external command execution, or financial transactions—merely arithmetic computation of a sales metric. The tool is analogous to sibling tools like 'absolute_value' and 'add', which are clearly Read category utilities.
From the tool's definition Tool name 'calculate_markup' and description 'Calculate selling price from cost and markup' indicate a pure calculation/computation that takes inputs (cost, markup percentage) and returns a computed result (selling price).
Attacks that exploit this kind of access
The rule that runs calculate_markup 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_markup, this is the rule to start with:
calculate_markup 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_markup call is checked against it from then on.
Questions about calculate_markup
Calculate selling price from cost and markup. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
calculate_markup accepts 2 parameters: cost, markup_percent. Required: cost, markup_percent. 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_markup: 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_markup 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_markup 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_markup. 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_markup 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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