array_difference
Get difference of two arrays (items in array1 not in array2).
This record as markdown: /tools/io-tinyfn-tinyfn/array-difference.md
What array_difference does on TinyFn
AI agents call array_difference 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 |
|---|---|---|---|
array1 | string | Yes | First comma-separated array |
array2 | string | Yes | Second comma-separated array |
Parameters from the server's own tool schema.
Why array_difference is rated Low
This is a deterministic utility function that reads input arrays and returns a computed result. It matches the Read category pattern: retrieves or queries data with no side effects. Severity is low because misuse by an AI agent would only produce incorrect output, not enable unauthorized access, data modification, deletion, or external harm.
From the tool's definition Tool 'array_difference' computes and returns the difference between two arrays—a pure mathematical/data transformation operation with no side effects, no external calls, no data persistence, and no state modification.
Attacks that exploit this kind of access
The rule that runs array_difference 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 array_difference, this is the rule to start with:
array_difference 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 array_difference call is checked against it from then on.
Questions about array_difference
Get difference of two arrays (items in array1 not in array2). It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
array_difference accepts 2 parameters: array1, array2. Required: array1, array2. 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 array_difference: 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.
array_difference 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 array_difference 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 array_difference. 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.
array_difference 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.
More on TinyFn, and thousands of servers like it.
This server
Across the catalogue