AI agents call sum_numbers to retrieve information from TinyFn without modifying anything — 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.
This tool performs a deterministic arithmetic calculation. It does not create, modify, delete, or execute external operations. It is a read-only mathematical function that falls squarely into the Read category (retrieves/computes data with no side effects). Severity is low because misuse of a sum calculation poses minimal risk to systems or data.
From the tool's definition Tool name is 'sum_numbers' and description states 'Calculate the sum of numbers.' This is a pure mathematical computation with no side effects—it retrieves/computes a result without modifying, creating, or deleting any data.
Attacks that exploit this kind of access
Calculate the sum of numbers. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
sum_numbers 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 sum_numbers: 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.
sum_numbers 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 sum_numbers 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 sum_numbers. 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.
sum_numbers 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.
sum_numbers is one line of TinyFn's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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