AI agents call format_ssn 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 | SSN to format |
Parameters from the server's own tool schema.
Formatting a Social Security Number takes an input string and returns a reformatted version (e.g., 'XXX-XX-XXXX') without creating, modifying, deleting, or executing anything. This is a pure data transformation with no persistence or external effects, placing it in the Read category (query/retrieve operations without side effects).
From the tool's definition Tool name 'format_ssn' and description 'Format a Social Security Number' indicate a formatting/transformation operation on input data with no side effects, no data modification, no code execution, and no deletion.
Attacks that exploit this kind of access
Format a Social Security Number. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
format_ssn accepts 1 parameter: number. 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_ssn: 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_ssn 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_ssn 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_ssn. 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_ssn 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_ssn 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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