AI agents call format_list to retrieve information from TinyFn without modifying anything — 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 |
conjunction | string | — | Conjunction to use (and, or) |
oxford_comma | boolean | — | Use Oxford comma |
Parameters from the server's own tool schema.
This tool performs a deterministic transformation of input data (formatting) without modifying any persistent state, creating external effects, or executing arbitrary operations. It is a pure utility function that reads/processes data and returns a result. Formatting operations are classification-typical Read operations.
From the tool's definition Tool 'format_list' formats a list of items with proper grammar. It takes input data and returns a formatted string representation.
Attacks that exploit this kind of access
Format a list of items with proper grammar. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
format_list accepts 3 parameters: items, conjunction, oxford_comma. 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 format_list: 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.
format_list 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 format_list 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 format_list. 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.
format_list 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.
format_list is one line of TinyFn's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →