loan_calculator
Monthly payment, total repayment and interest for an amortising loan (annuity formula). Runs on smart-tools.xyz.
This record as markdown: /tools/io-github-9thshini-smart-tools/loan-calculator.md
What loan_calculator does on SmartTools
AI agents invoke loan_calculator to trigger actions in SmartTools. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
| Parameter | Type | Required | Description |
|---|---|---|---|
years | number | string | Yes | Term in years |
locale | string | — | Language for the source_url link (default en) |
principal | number | string | Yes | Loan amount |
annual_rate | number | string | Yes | Annual interest rate, percent |
Parameters from the server's own tool schema.
Why loan_calculator is rated High
loan_calculator triggers real processes with real consequences. An agent gone sideways doesn't fire it once. It starts dozens of builds, sends mass notifications, or burns through compute before anyone looks up.
Attacks that exploit this kind of access
The rule that runs loan_calculator safely
PolicyLayer is an MCP gateway: it sits between your AI agents and SmartTools, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For loan_calculator, this is the rule to start with:
loan_calculator stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect SmartTools, apply this rule, and every loan_calculator call is checked against it from then on.
Questions about loan_calculator
Monthly payment, total repayment and interest for an amortising loan (annuity formula). Runs on smart-tools.xyz. It is categorised as a Execute tool in the SmartTools MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
loan_calculator accepts 4 parameters: years, locale, principal, annual_rate. Required: years, principal, annual_rate. The full parameter table on this page comes from the server's own tool schema.
Register the SmartTools MCP server in PolicyLayer and add a rule for loan_calculator: 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 SmartTools. Nothing to install.
loan_calculator is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the loan_calculator 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 loan_calculator. 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.
loan_calculator is provided by the SmartTools MCP server (https://smart-tools.xyz/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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