point_in_polygon
Check if a point is inside a polygon (ray casting algorithm).
This record as markdown: /tools/io-tinyfn-tinyfn/point-in-polygon.md
What point_in_polygon does on TinyFn
AI agents call point_in_polygon 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 |
|---|---|---|---|
lat | number | Yes | Point latitude |
lon | number | Yes | Point longitude |
polygon | string | Yes | Polygon vertices as lat1,lon1;lat2,lon2;lat3,lon3... |
Parameters from the server's own tool schema.
Why point_in_polygon is rated Low
This is a deterministic mathematical/geometric utility that performs a pure calculation (ray casting algorithm) on provided inputs to return a boolean result. It retrieves or computes information without modifying state, creating data, executing external operations, or causing irreversible changes.
From the tool's definition Tool name 'point_in_polygon' and description 'Check if a point is inside a polygon' indicates a pure geometric query operation. The verb 'Check' and the read-only nature of geometric testing confirm retrieval of computational results without side effects.
Attacks that exploit this kind of access
The rule that runs point_in_polygon 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 point_in_polygon, this is the rule to start with:
point_in_polygon 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 point_in_polygon call is checked against it from then on.
Questions about point_in_polygon
Check if a point is inside a polygon (ray casting algorithm). It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
point_in_polygon accepts 3 parameters: lat, lon, polygon. Required: lat, lon, 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 point_in_polygon: 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.
point_in_polygon 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 point_in_polygon 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 point_in_polygon. 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.
point_in_polygon 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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