rule_of_72
Rule of 72 Doubling-Time Calculator — Years to double at a rate (72/70/69.3), or the rate needed to double.
This record as markdown: /tools/com-wingmanprotocol-agent-gateway/rule-of-72.md
What rule_of_72 does on Gateway
AI agents call rule_of_72 to retrieve information from Gateway 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 |
|---|---|---|---|
years | number | — | Target doubling years (gives required rate) |
annual_rate_pct | number | — | Annual growth rate percent (gives doubling years) |
Parameters from the server's own tool schema.
Why rule_of_72 is rated Low
rule_of_72 is a financial mathematics calculator that retrieves or computes derived values (doubling time or required rate) based on input parameters. It has no side effects—it does not create, modify, delete data, execute code, or commit financial obligations.
From the tool's definition Tool performs calculation-only operations: '72/70/69.3', 'Years to double at a rate', 'rate needed to double'. No description indicates data modification, deletion, code execution, or financial transactions.
Attacks that exploit this kind of access
The rule that runs rule_of_72 safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Gateway, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For rule_of_72, this is the rule to start with:
rule_of_72 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 Gateway, apply this rule, and every rule_of_72 call is checked against it from then on.
Questions about rule_of_72
Rule of 72 Doubling-Time Calculator — Years to double at a rate (72/70/69.3), or the rate needed to double. It is categorised as a Read tool in the Gateway MCP Server, which means it retrieves data without modifying state.
rule_of_72 accepts 2 parameters: years, annual_rate_pct. The full parameter table on this page comes from the server's own tool schema.
Register the Gateway MCP server in PolicyLayer and add a rule for rule_of_72: 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 Gateway. Nothing to install.
rule_of_72 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 rule_of_72 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 rule_of_72. 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.
rule_of_72 is provided by the Gateway MCP server (https://wingmanprotocol.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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