format_list

Format a list of items with proper grammar.

SERVERTinyFn SOURCEhttps://api.tinyfn.io/mcp/all/

Low RISK CLASS

Category Read

Parameters 31 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-tinyfn-tinyfn/format-list.md

WHAT IT DOES

What format_list does on TinyFn

AI agents call format_list 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
`conjunction`	string	—	Conjunction to use (and, or)
`oxford_comma`	boolean	—	Use Oxford comma

Parameters from the server's own tool schema.

RISK

Why format_list is rated Low

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

RECOMMENDED RULE

The rule that runs format_list 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 format_list, this is the rule to start with:

format_list Allowed

format_list is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "format_list": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every format_list call is checked against it from then on.

FAQ

Questions about format_list

What does the format_list tool do? +

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.

What parameters does format_list accept? +

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.

How do I enforce a policy on format_list? +

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.

What risk level is format_list? +

format_list is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit format_list? +

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.

How do I block format_list completely? +

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.

What MCP server provides format_list? +

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.

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