polygon_area
Calculate area of a polygon on Earth's surface.
This record as markdown: /tools/io-tinyfn-tinyfn/polygon-area.md
What polygon_area does on TinyFn
AI agents call polygon_area 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 |
|---|---|---|---|
unit | string | — | Unit: km2 or mi2 |
polygon | string | Yes | Polygon vertices as lat1,lon1;lat2,lon2;lat3,lon3... |
Parameters from the server's own tool schema.
Why polygon_area is rated Low
This is a deterministic mathematical calculation tool that takes polygon coordinates as input and returns an area value. It performs read-only computation with no ability to modify, delete, or execute external operations. Severity is low because misuse poses no risk to data integrity, availability, or security.
From the tool's definition Tool name 'polygon_area' and description 'Calculate area of a polygon on Earth's surface' indicate a pure calculation/query operation. It retrieves no external data, creates no side effects, modifies no state, and executes no arbitrary code.
Attacks that exploit this kind of access
The rule that runs polygon_area 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 polygon_area, this is the rule to start with:
polygon_area 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 polygon_area call is checked against it from then on.
Questions about polygon_area
Calculate area of a polygon on Earth's surface. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
polygon_area accepts 2 parameters: unit, polygon. Required: polygon. 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 polygon_area: 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.
polygon_area 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 polygon_area 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 polygon_area. 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.
polygon_area 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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