is_private_ip
Check if an IP address is private (RFC 1918 for IPv4).
This record as markdown: /tools/io-tinyfn-tinyfn/is-private-ip.md
What is_private_ip does on TinyFn
AI agents call is_private_ip 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 |
|---|---|---|---|
ip | string | Yes | IP address to check |
Parameters from the server's own tool schema.
Why is_private_ip is rated Low
This tool retrieves or queries data (whether an IP falls within RFC 1918 private ranges) with no side effects, state changes, or external operations. It is deterministic validation logic, consistent with the server's stated purpose of providing 'validation' tools. Misuse by an AI agent (e.g., checking IPs) poses minimal risk and cannot delete, modify, execute, or move money.
From the tool's definition Tool name is_private_ip with description 'Check if an IP address is private (RFC 1918 for IPv4)' — this is a pure validation/query operation that checks and returns information about an IP address without modifying state, executing code, or affecting external…
Attacks that exploit this kind of access
The rule that runs is_private_ip 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 is_private_ip, this is the rule to start with:
is_private_ip is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every is_private_ip call is checked against it from then on.
Questions about is_private_ip
Check if an IP address is private (RFC 1918 for IPv4). It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
is_private_ip accepts 1 parameter: ip. Required: ip. 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 is_private_ip: 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.
is_private_ip 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 is_private_ip 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 is_private_ip. 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.
is_private_ip 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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