npv
Net Present Value (NPV) Calculator — NPV of a cash-flow series at a discount rate (index 0 = initial outlay).
This record as markdown: /tools/com-wingmanprotocol-agent-gateway/npv.md
What npv does on Gateway
AI agents call npv 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 |
|---|---|---|---|
cash_flows | array | Yes | Array of cash flows; index 0 is t=0 (often negative) |
discount_rate_pct | number | Yes | Discount rate as a PERCENT (10 = 10%) |
Parameters from the server's own tool schema.
Why npv is rated Low
This is a financial calculator that performs a standard time-value-of-money analysis. It retrieves no external state, modifies no data, executes no code or commands, deletes nothing, and moves no money. It is functionally equivalent to a spreadsheet formula: deterministic input→output computation with no persistent effects.
From the tool's definition Tool description states it 'calculates' NPV of a cash-flow series—a pure computation that takes inputs (cash flows, discount rate) and returns a mathematical result.
Attacks that exploit this kind of access
The rule that runs npv 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 npv, this is the rule to start with:
npv 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 npv call is checked against it from then on.
Questions about npv
Net Present Value (NPV) Calculator — NPV of a cash-flow series at a discount rate (index 0 = initial outlay). It is categorised as a Read tool in the Gateway MCP Server, which means it retrieves data without modifying state.
npv accepts 2 parameters: cash_flows, discount_rate_pct. Required: cash_flows, discount_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 npv: 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.
npv 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 npv 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 npv. 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.
npv 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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