bulc_auto_mesh · BULC Building Designer MCP: Risk & Policy

WHAT IT DOES

What bulc_auto_mesh does on BULC Building Designer

AI agents use bulc_auto_mesh to create or update resources in BULC Building Designer — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your BULC Building Designer environment.

WHY IT NEEDS A POLICY

Why bulc_auto_mesh needs a policy

This tool creates/generates a new FDS mesh object based on existing building geometry. It is a Write operation (creation of simulation data), not destructive since it generates new data rather than deleting existing data. Misuse could result in incorrect mesh configurations affecting fire simulation accuracy, giving it medium severity.

From the tool's definition Automatically generate FDS mesh based on building geometry

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bulc_auto_mesh Rate-limited

bulc_auto_mesh stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "bulc_auto_mesh": {
      "limits": [
        {
          "counter": "bulc_auto_mesh_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches BULC Building Designer, so you can run agents against it safely.

FAQ

Questions about bulc_auto_mesh

What does the bulc_auto_mesh tool do? +

Automatically generate FDS mesh based on building geometry. It is categorised as a Write tool in the BULC Building Designer MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on bulc_auto_mesh? +

Register the BULC Building Designer MCP server in PolicyLayer and add a rule for bulc_auto_mesh: 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 BULC Building Designer. Nothing to install.

What risk level is bulc_auto_mesh? +

bulc_auto_mesh is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit bulc_auto_mesh? +

Yes. Add a rate_limit block to the bulc_auto_mesh 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.

How do I block bulc_auto_mesh completely? +

Set action: deny in the PolicyLayer policy for bulc_auto_mesh. 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.

What MCP server provides bulc_auto_mesh? +

bulc_auto_mesh is provided by the BULC Building Designer MCP server (using76/bulc_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.