This record as markdown: /tools/io-tinyfn-tinyfn/array-slice.md
What array_slice does on TinyFn
AI agents call array_slice 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 |
|---|---|---|---|
end | integer | — | End index (exclusive) |
items | string | Yes | Comma-separated items |
start | integer | — | Start index |
Parameters from the server's own tool schema.
Why array_slice is rated Low
Array slicing is a non-destructive read operation that extracts a subset of array elements. It has no side effects, creates no data, executes no external code, and cannot delete or modify the original array. This is a purely informational operation consistent with the Read category. Severity is low because misuse poses minimal risk—the worst outcome is returning incorrect array segments.
From the tool's definition Tool name 'array_slice' and description 'Slice an array' indicates a data retrieval/transformation operation that reads array elements without modification or side effects.
Attacks that exploit this kind of access
The rule that runs array_slice 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_slice, this is the rule to start with:
array_slice 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_slice call is checked against it from then on.
Questions about array_slice
Slice an array. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
array_slice accepts 3 parameters: end, items, start. 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_slice: 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_slice 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_slice 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_slice. 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_slice 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