bulc_modify_wall · BULC Building Designer MCP: Risk & Policy

WHAT IT DOES

What bulc_modify_wall does on BULC Building Designer

AI agents use bulc_modify_wall 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_wall needs a policy

This tool modifies wall properties within the BULC building design system. Modification is a Write operation—it creates or changes data reversibly without deleting or destroying. The severity is medium because misuse could corrupt a building design (requiring undo/redo to fix), but the operation is reversible and the blast radius is limited to a single wall's properties rather than cascading destruction.

From the tool's definition Tool name is 'bulc_modify_wall' and description states 'Modify properties of an existing wall. Only specified properties will be changed.' The verb 'modify' and the explicit mention of changing properties indicate reversible alteration of existing data…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bulc_modify_wall Rate-limited

bulc_modify_wall 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_wall": {
      "limits": [
        {
          "counter": "bulc_modify_wall_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_wall

What does the bulc_modify_wall tool do? +

Modify properties of an existing wall. 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_wall? +

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

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

Can I rate-limit bulc_modify_wall? +

Yes. Add a rate_limit block to the bulc_modify_wall 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_wall completely? +

Set action: deny in the PolicyLayer policy for bulc_modify_wall. 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_wall? +

bulc_modify_wall 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.