investment_fee
Investment Fee Impact Calculator — How much an expense ratio costs over time — ending balance with vs without fees, and total fee drag.
This record as markdown: /tools/com-wingmanprotocol-agent-gateway/investment-fee.md
What investment_fee does on Gateway
AI agents call investment_fee 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 | Investment horizon in years |
gross_return | number | — | Gross annual return before fees as a PERCENT (default 7) |
expense_ratio | number | — | Annual fee/expense ratio as a PERCENT (default 0.5) |
initial_investment | number | Yes | Starting investment in USD |
annual_contribution | number | — | Amount added each year in USD |
Parameters from the server's own tool schema.
Why investment_fee is rated Low
This is a read-only financial analysis tool. It computes and returns informational outputs (projected balances, fee impact) based on input parameters. There are no side effects, no irreversible actions, no money movement, and no code execution triggered by user input.
From the tool's definition The tool is described as a calculator that shows 'ending balance with vs without fees, and total fee drag' — it performs financial calculations and displays results without modifying any accounts, executing trades, moving money, or making financial…
Attacks that exploit this kind of access
The rule that runs investment_fee 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 investment_fee, this is the rule to start with:
investment_fee 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 investment_fee call is checked against it from then on.
Questions about investment_fee
Investment Fee Impact Calculator — How much an expense ratio costs over time — ending balance with vs without fees, and total fee drag. It is categorised as a Read tool in the Gateway MCP Server, which means it retrieves data without modifying state.
investment_fee accepts 5 parameters: years, gross_return, expense_ratio, initial_investment, annual_contribution. Required: years, initial_investment. 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 investment_fee: 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.
investment_fee 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 investment_fee 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 investment_fee. 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.
investment_fee 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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