subnet_mask_info
Get subnet mask from prefix length.
This record as markdown: /tools/io-tinyfn-tinyfn/subnet-mask-info.md
What subnet_mask_info does on TinyFn
AI agents call subnet_mask_info 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 |
|---|---|---|---|
prefix_length | integer | Yes | CIDR prefix length (0-32) |
Parameters from the server's own tool schema.
Why subnet_mask_info is rated Low
This tool performs a deterministic mathematical conversion from a CIDR prefix length to a subnet mask notation—a pure read operation with no side effects. It retrieves computed data without altering any system state or triggering external operations. Blast radius from misuse is negligible, as incorrect subnet mask lookups cannot compromise security or functionality beyond providing wrong information to the agent.
From the tool's definition Tool name 'subnet_mask_info' and description 'Get subnet mask from prefix length' indicate a query/lookup operation that retrieves network configuration information without modifying any state or executing external operations.
Attacks that exploit this kind of access
The rule that runs subnet_mask_info 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 subnet_mask_info, this is the rule to start with:
subnet_mask_info 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 subnet_mask_info call is checked against it from then on.
Questions about subnet_mask_info
Get subnet mask from prefix length. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
subnet_mask_info accepts 1 parameter: prefix_length. Required: prefix_length. 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 subnet_mask_info: 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.
subnet_mask_info 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 subnet_mask_info 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 subnet_mask_info. 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.
subnet_mask_info 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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