AI agents call format_phone 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 |
|---|---|---|---|
number | string | Yes | Phone number to format |
country | string | — | Country code (US, UK, DE, FR, etc.) |
Parameters from the server's own tool schema.
This tool takes a phone number as input and returns a formatted version according to country-specific conventions. It is a pure data transformation utility that does not create, modify, delete, or execute anything. It simply reads input and returns formatted output, matching the Read category pattern of retrieval/query operations with no side effects.
From the tool's definition Tool name 'format_phone' and description 'Format a phone number according to country conventions' indicate a transformation/formatting operation with no side effects.
Attacks that exploit this kind of access
Format a phone number according to country conventions. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
format_phone accepts 2 parameters: number, country. 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_phone: 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_phone 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_phone 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_phone. 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_phone 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_phone 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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