bill_of_materials
Bill of Materials / Takeoff Aggregator — Aggregate a construction takeoff: per-line extended cost plus subtotal, waste allowance, tax and grand total.
This record as markdown: /tools/com-wingmanprotocol-agent-gateway/bill-of-materials.md
What bill_of_materials does on Gateway
AI agents call bill_of_materials 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 |
|---|---|---|---|
items | array | Yes | Line items: [{item, qty, unit_cost}] |
tax_pct | number | — | Sales-tax percent applied to subtotal + waste |
waste_pct | number | — | Material waste/over-order percent applied to the subtotal |
Parameters from the server's own tool schema.
Why bill_of_materials is rated Low
This tool performs calculation and aggregation of cost data (bill of materials/takeoff). It computes extended costs, subtotals, waste allowances, tax, and grand totals — a read/calculate operation with no side effects, no data mutation, no code execution, and no financial transactions. It is a calculator tool consistent with the server description mentioning '15 calculators for AI agents'.
From the tool's definition Aggregate a construction takeoff: per-line extended cost plus subtotal, waste allowance, tax and grand total
Attacks that exploit this kind of access
The rule that runs bill_of_materials 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 bill_of_materials, this is the rule to start with:
bill_of_materials 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 bill_of_materials call is checked against it from then on.
Questions about bill_of_materials
Bill of Materials / Takeoff Aggregator — Aggregate a construction takeoff: per-line extended cost plus subtotal, waste allowance, tax and grand total. It is categorised as a Read tool in the Gateway MCP Server, which means it retrieves data without modifying state.
bill_of_materials accepts 3 parameters: items, tax_pct, waste_pct. Required: items. 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 bill_of_materials: 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.
bill_of_materials 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 bill_of_materials 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 bill_of_materials. 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.
bill_of_materials 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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