simple_interest
Simple Interest Calculator — Non-compounding interest and total from principal, rate and years.
This record as markdown: /tools/com-wingmanprotocol-agent-gateway/simple-interest.md
What simple_interest does on Gateway
AI agents call simple_interest 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 | Yes | Number of years |
principal | number | Yes | Principal in USD |
annual_rate_pct | number | Yes | Annual rate as a percent (5 = 5%) |
Parameters from the server's own tool schema.
Why simple_interest is rated Low
This is a financial calculator that performs arithmetic on provided parameters. It reads inputs, computes a result, and returns it without modifying any state, creating obligations, executing external code, or deleting data. Financial calculators are Read operations unless they actively move money or commit real financial transactions; this one merely performs math.
From the tool's definition Tool name is 'simple_interest' and description states it 'calculates non-compounding interest and total from principal, rate and years' — a pure computational function that takes numeric inputs and returns calculated results with no side effects.
Attacks that exploit this kind of access
The rule that runs simple_interest 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 simple_interest, this is the rule to start with:
simple_interest 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 simple_interest call is checked against it from then on.
Questions about simple_interest
Simple Interest Calculator — Non-compounding interest and total from principal, rate and years. It is categorised as a Read tool in the Gateway MCP Server, which means it retrieves data without modifying state.
simple_interest accepts 3 parameters: years, principal, annual_rate_pct. Required: years, principal, 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 simple_interest: 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.
simple_interest 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 simple_interest 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 simple_interest. 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.
simple_interest 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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