bulc_stop_fds · BULC Building Designer MCP: Risk & Policy

WHAT IT DOES

What bulc_stop_fds does on BULC Building Designer

AI agents invoke bulc_stop_fds to trigger actions in BULC Building Designer. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why bulc_stop_fds needs a policy

This tool triggers an external operation (stopping an FDS fire simulation) whose effects depend on the current state of the system. While stopping a simulation is reversible (simulations can be restarted), it is an Execute action because it directly controls an external process/operation.

From the tool's definition Tool name 'bulc_stop_fds' and description 'Stop a running FDS simulation' indicate execution of a control command that terminates an external simulation process.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bulc_stop_fds Rate-limited

bulc_stop_fds stays usable, but rate-capped — a runaway agent can't fire it dozens of times 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_stop_fds": {
      "limits": [
        {
          "counter": "bulc_stop_fds_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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_stop_fds

What does the bulc_stop_fds tool do? +

Stop a running FDS simulation. It is categorised as a Execute tool in the BULC Building Designer MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on bulc_stop_fds? +

Register the BULC Building Designer MCP server in PolicyLayer and add a rule for bulc_stop_fds: 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_stop_fds? +

bulc_stop_fds is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit bulc_stop_fds? +

Yes. Add a rate_limit block to the bulc_stop_fds 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_stop_fds completely? +

Set action: deny in the PolicyLayer policy for bulc_stop_fds. 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_stop_fds? +

bulc_stop_fds 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.