This record as markdown: /tools/io-tinyfn-tinyfn/array-reverse.md
What array_reverse does on TinyFn
AI agents call array_reverse 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 |
|---|---|---|---|
items | string | Yes | Comma-separated items |
Parameters from the server's own tool schema.
Why array_reverse is rated Low
This tool takes an array and returns it in reversed order. It is a deterministic, stateless transformation consistent with the server's stated purpose of providing 500+ deterministic tools. No data is written, deleted, or executed; it simply reorders elements in memory.
From the tool's definition 'Reverse an array' — pure transformation of input data with no side effects, no persistence, no deletion, and no external operations.
Attacks that exploit this kind of access
The rule that runs array_reverse 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_reverse, this is the rule to start with:
array_reverse 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_reverse call is checked against it from then on.
Questions about array_reverse
Reverse an array. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
array_reverse accepts 1 parameter: 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_reverse: 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_reverse 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_reverse 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_reverse. 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_reverse 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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