compound_interest
Compound Interest / Future Value Calculator — Future value, total contributions and interest with optional periodic deposits.
This record as markdown: /tools/com-wingmanprotocol-agent-gateway/compound-interest.md
What compound_interest does on Gateway
AI agents call compound_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 | — | Starting principal in USD |
contribution | number | — | Deposit added each compounding period, USD |
annual_rate_pct | number | Yes | Annual interest rate as a PERCENT (6 = 6%) |
compounds_per_year | integer | — | Compounding periods per year (default 12) |
Parameters from the server's own tool schema.
Why compound_interest is rated Low
Despite the financial terminology, this tool is purely computational: it accepts interest rate, principal, and time parameters and returns calculated values. It does not execute transactions, move money, modify accounts, or have irreversible effects. It is a read-only calculation utility, similar to other calculators in the 'x402 on Base' suite.
From the tool's definition Tool is a 'Calculator' that computes 'Future value, total contributions and interest' — it performs financial calculations and returns computed results without modifying any state, accounts, or financial systems.
Attacks that exploit this kind of access
The rule that runs compound_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 compound_interest, this is the rule to start with:
compound_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 compound_interest call is checked against it from then on.
Questions about compound_interest
Compound Interest / Future Value Calculator — Future value, total contributions and interest with optional periodic deposits. It is categorised as a Read tool in the Gateway MCP Server, which means it retrieves data without modifying state.
compound_interest accepts 5 parameters: years, principal, contribution, annual_rate_pct, compounds_per_year. Required: 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 compound_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.
compound_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 compound_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 compound_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.
compound_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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