AI agents call format_percentage 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 |
|---|---|---|---|
value | number | Yes | Value to format as percentage |
decimals | integer | — | Decimal places |
multiply | boolean | — | Multiply by 100 (0.5 -> 50%) |
Parameters from the server's own tool schema.
This is a deterministic formatting utility with no side effects. It takes a numeric input and returns a formatted output without modifying any external state, files, or data. It falls clearly into the Read category as a retrieval/query-like operation (though in this case, a mathematical transformation rather than data retrieval).
From the tool's definition Tool name 'format_percentage' and description 'Format a number as a percentage' indicate a pure data transformation function that reads a number and returns a formatted string representation.
Attacks that exploit this kind of access
Format a number as a percentage. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
format_percentage accepts 3 parameters: value, decimals, multiply. Required: value. 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_percentage: 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_percentage 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_percentage 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_percentage. 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_percentage 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_percentage 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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