sales_tax
Sales Tax Calculator — Add tax to a net amount, or extract tax from a tax-inclusive total.
This record as markdown: /tools/com-wingmanprotocol-agent-gateway/sales-tax.md
What sales_tax does on Gateway
AI agents call sales_tax 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 |
|---|---|---|---|
amount | number | Yes | Amount in USD |
inclusive | boolean | — | True if amount already includes tax |
tax_rate_pct | number | Yes | Tax rate as a percent, e.g. 8.25 |
Parameters from the server's own tool schema.
Why sales_tax is rated Low
This tool performs a mathematical calculation on provided inputs (net amount or tax-inclusive total) to compute sales tax. It retrieves/computes a result with no side effects, no data modification, no execution of commands, and no financial transactions. It is purely a read/calculate operation.
From the tool's definition Sales Tax Calculator — Add tax to a net amount, or extract tax from a tax-inclusive total.
Attacks that exploit this kind of access
The rule that runs sales_tax 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 sales_tax, this is the rule to start with:
sales_tax 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 sales_tax call is checked against it from then on.
Questions about sales_tax
Sales Tax Calculator — Add tax to a net amount, or extract tax from a tax-inclusive total. It is categorised as a Read tool in the Gateway MCP Server, which means it retrieves data without modifying state.
sales_tax accepts 3 parameters: amount, inclusive, tax_rate_pct. Required: amount, tax_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 sales_tax: 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.
sales_tax 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 sales_tax 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 sales_tax. 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.
sales_tax 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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