annuity
Annuity Present / Future Value — Compute the present or future value of an ordinary annuity or annuity-due.
This record as markdown: /tools/com-wingmanprotocol-agent-gateway/annuity.md
What annuity does on Gateway
AI agents call annuity 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 |
|---|---|---|---|
due | boolean | — | True for annuity-due (default ordinary) |
mode | string | — | pv or fv |
rate | number | Yes | Rate per period as a decimal |
payment | number | Yes | Payment per period |
periods | integer | Yes | Number of periods |
Parameters from the server's own tool schema.
Why annuity is rated Low
This is a financial calculator that performs mathematical computations on annuity parameters and returns results. It does not move money, execute trades, create financial obligations, or modify persistent state. The tool is analogous to other calculators in the sibling tool set (base_convert, bayes, amortization_schedule), which are Read-category utilities.
From the tool's definition Tool computes and returns present or future value calculations for annuity financial instruments. Description uses passive voice ('Compute the present or future value') indicating data retrieval/calculation without state modification or money movement.
Attacks that exploit this kind of access
The rule that runs annuity 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 annuity, this is the rule to start with:
annuity 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 annuity call is checked against it from then on.
Questions about annuity
Annuity Present / Future Value — Compute the present or future value of an ordinary annuity or annuity-due. It is categorised as a Read tool in the Gateway MCP Server, which means it retrieves data without modifying state.
annuity accepts 5 parameters: due, mode, rate, payment, periods. Required: rate, payment, periods. 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 annuity: 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.
annuity 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 annuity 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 annuity. 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.
annuity 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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