polyline_length
Calculate total length of a polyline.
This record as markdown: /tools/io-tinyfn-tinyfn/polyline-length.md
What polyline_length does on TinyFn
AI agents call polyline_length 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: km or mi |
polyline | string | Yes | Polyline points as lat1,lon1;lat2,lon2;lat3,lon3... |
Parameters from the server's own tool schema.
Why polyline_length is rated Low
This is a deterministic mathematical utility that retrieves no external data and performs no side effects. It computes a property of input geometry and returns the result. It belongs in the Read category as a query-like operation within a mathematical tools suite.
From the tool's definition Tool name 'polyline_length' and description 'Calculate total length of a polyline' indicate a pure calculation/query operation that reads geometric data and returns a computed value without modifying state, creating resources, or triggering external…
Attacks that exploit this kind of access
The rule that runs polyline_length 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 polyline_length, this is the rule to start with:
polyline_length 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 polyline_length call is checked against it from then on.
Questions about polyline_length
Calculate total length of a polyline. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
polyline_length accepts 2 parameters: unit, polyline. Required: polyline. 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 polyline_length: 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.
polyline_length 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 polyline_length 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 polyline_length. 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.
polyline_length 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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