AI agents call format_number 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 |
|---|---|---|---|
locale | string | — | Locale (en-US, de-DE, fr-FR, etc.) |
number | number | Yes | Number to format |
decimals | integer | — | Decimal places |
Parameters from the server's own tool schema.
This tool performs a read-only formatting operation on numeric data. It takes a number as input and returns a formatted string representation using locale-specific conventions (thousands separators, decimal points, etc.). There are no side effects, no data is created, modified, or deleted in any system, and the operation is purely computational and reversible.
From the tool's definition Tool name 'format_number' and description 'Format a number with locale-specific separators' indicate a data transformation operation that reads input and produces formatted output without side effects, modifications to external state, or irreversible actions.
Attacks that exploit this kind of access
Format a number with locale-specific separators. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
format_number accepts 3 parameters: locale, number, decimals. Required: number. 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_number: 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_number 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_number 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_number. 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_number 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_number 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.
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