This record as markdown: /tools/io-tinyfn-tinyfn/calculate-sum.md
What calculate_sum does on TinyFn
AI agents call calculate_sum 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 |
|---|---|---|---|
numbers | string | Yes | Comma-separated numbers |
Parameters from the server's own tool schema.
Why calculate_sum is rated Low
This is a deterministic math function that reads input values and returns a computed result. It has no capability to modify state, delete data, execute arbitrary code, or trigger financial transactions. The low severity reflects minimal blast radius if misused by an AI agent—worst case being incorrect calculations that don't persist or cause irreversible damage.
From the tool's definition Tool name 'calculate_sum' and description 'Calculate sum of numbers' indicate a pure mathematical computation with no side effects, no data modification, and no external operations triggered.
Attacks that exploit this kind of access
The rule that runs calculate_sum 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_sum, this is the rule to start with:
calculate_sum 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_sum call is checked against it from then on.
Questions about calculate_sum
Calculate sum of numbers. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
calculate_sum accepts 1 parameter: numbers. Required: numbers. 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_sum: 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_sum 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_sum 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_sum. 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_sum 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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