floor_joist
Floor Joist Span Calculator — Joist size/spacing feasibility and count for a floor span under a given live load.
This record as markdown: /tools/com-wingmanprotocol-agent-gateway/floor-joist.md
What floor_joist does on Gateway
AI agents call floor_joist 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 |
|---|---|---|---|
span | number | Yes | Clear span in feet |
grade | string | — | Lumber grade |
species | string | — | Lumber species/grade group |
room_width | number | Yes | Room width (joist run) in feet |
spacing_in | number | — | Joist spacing on-center in inches (default 16) |
live_load_psf | number | — | Live load in psf (default 40) |
Parameters from the server's own tool schema.
Why floor_joist is rated Low
This tool performs a structural engineering calculation (floor joist span feasibility and count) based on input parameters. It only computes and returns results with no side effects, data modification, or external operations.
From the tool's definition Floor Joist Span Calculator — Joist size/spacing feasibility and count for a floor span under a given live load.
Attacks that exploit this kind of access
The rule that runs floor_joist 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 floor_joist, this is the rule to start with:
floor_joist 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 floor_joist call is checked against it from then on.
Questions about floor_joist
Floor Joist Span Calculator — Joist size/spacing feasibility and count for a floor span under a given live load. It is categorised as a Read tool in the Gateway MCP Server, which means it retrieves data without modifying state.
floor_joist accepts 6 parameters: span, grade, species, room_width, spacing_in, live_load_psf. Required: span, room_width. 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 floor_joist: 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.
floor_joist 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 floor_joist 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 floor_joist. 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.
floor_joist 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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