haversine_distance
Calculate distance between two coordinates using Haversine formula.
This record as markdown: /tools/io-tinyfn-tinyfn/haversine-distance.md
What haversine_distance does on TinyFn
AI agents call haversine_distance 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 |
|---|---|---|---|
lat1 | number | Yes | Latitude of point 1 |
lat2 | number | Yes | Latitude of point 2 |
lon1 | number | Yes | Longitude of point 1 |
lon2 | number | Yes | Longitude of point 2 |
unit | string | — | Unit: km or mi |
Parameters from the server's own tool schema.
Why haversine_distance is rated Low
This is a deterministic mathematical utility that takes coordinate inputs and returns a computed distance value. It performs no I/O operations, data mutations, external command execution, or irreversible actions. It is a read-only computational tool, consistent with the server's purpose of providing 500+ deterministic tools for calculations and conversions.
From the tool's definition Tool name 'haversine_distance' and description 'Calculate distance between two coordinates using Haversine formula' indicate a pure mathematical calculation that retrieves/computes a result from input parameters with no side effects, no data modification, no…
Attacks that exploit this kind of access
The rule that runs haversine_distance 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 haversine_distance, this is the rule to start with:
haversine_distance 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 haversine_distance call is checked against it from then on.
Questions about haversine_distance
Calculate distance between two coordinates using Haversine formula. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
haversine_distance accepts 5 parameters: lat1, lat2, lon1, lon2, unit. Required: lat1, lat2, lon1, lon2. 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 haversine_distance: 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.
haversine_distance 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 haversine_distance 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 haversine_distance. 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.
haversine_distance 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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