bulc_modify_room · BULC Building Designer MCP: Risk & Policy

WHAT IT DOES

What bulc_modify_room does on BULC Building Designer

AI agents use bulc_modify_room 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_modify_room needs a policy

This tool creates or modifies data (room properties) in a reversible manner. It does not execute external code or shell commands, delete data permanently, move money, or merely read information. The blast radius is medium because incorrect room modifications could require manual correction by the user but are undoable per the server description's mention of 'undo/redo support'.

From the tool's definition Tool name 'bulc_modify_room' and description 'Modify properties of an existing room. Only specified properties will be changed.' indicate reversible modification of data structures within the building design.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bulc_modify_room Rate-limited

bulc_modify_room 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_modify_room": {
      "limits": [
        {
          "counter": "bulc_modify_room_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_modify_room

What does the bulc_modify_room tool do? +

Modify properties of an existing room. Only specified properties will be changed. 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_modify_room? +

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

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

Can I rate-limit bulc_modify_room? +

Yes. Add a rate_limit block to the bulc_modify_room 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_modify_room completely? +

Set action: deny in the PolicyLayer policy for bulc_modify_room. 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_modify_room? +

bulc_modify_room 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.