This record as markdown: /tools/io-tinyfn-tinyfn/unique-items.md
What unique_items does on TinyFn
AI agents call unique_items 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 unique_items is rated Low
This is a simple deterministic utility that queries/filters a list to return unique elements. It has no capacity to modify state, execute code, delete data, or trigger external operations. The low severity reflects the minimal security risk from misuse of such a basic data filtering function.
From the tool's definition Tool name 'unique_items' and description 'Get unique items from a list' indicate a retrieval/filtering operation with no side effects.
Attacks that exploit this kind of access
The rule that runs unique_items 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 unique_items, this is the rule to start with:
unique_items 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 unique_items call is checked against it from then on.
Questions about unique_items
Get unique items from a list. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
unique_items 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 unique_items: 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.
unique_items 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 unique_items 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 unique_items. 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.
unique_items 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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