This record as markdown: /tools/io-tinyfn-tinyfn/array-last.md
What array_last does on TinyFn
AI agents call array_last 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 |
|---|---|---|---|
n | integer | — | Number of items to get |
items | string | Yes | Comma-separated items |
Parameters from the server's own tool schema.
Why array_last is rated Low
This is a deterministic utility function that retrieves a subset of array elements. It performs no mutations, external operations, code execution, financial transactions, or destructive actions. Classified as Read with low severity due to minimal risk even if misused by an AI agent - the worst outcome would be incorrect data retrieval, not system compromise or data loss.
From the tool's definition Tool description states 'Get last n items from array' - a pure retrieval operation with no side effects. The function name 'array_last' and description indicate it queries/extracts data from an array without modification.
Attacks that exploit this kind of access
The rule that runs array_last 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_last, this is the rule to start with:
array_last 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_last call is checked against it from then on.
Questions about array_last
Get last n items from array. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
array_last accepts 2 parameters: n, items. Required: items. 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_last: 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_last 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_last 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_last. 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_last 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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