bulc_redo · BULC Building Designer MCP: Risk & Policy

WHAT IT DOES

What bulc_redo does on BULC Building Designer

AI agents use bulc_redo 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_redo needs a policy

The redo operation modifies the design state by reapplying a previously undone change (e.g., re-creating a room or wall that was undone). While the operation itself is reversible via undo, it is a Write action that alters the building model. It is not Execute because it does not run arbitrary code or trigger external operations—it operates within the undo/redo stack.

From the tool's definition Tool name 'bulc_redo' and description 'Redo the last undone operation' indicate it reverses an undo action, thereby reapplying a previous modification to the building design.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bulc_redo Rate-limited

bulc_redo 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_redo": {
      "limits": [
        {
          "counter": "bulc_redo_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_redo

What does the bulc_redo tool do? +

Redo the last undone operation. Returns information about what was redone. 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_redo? +

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

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

Can I rate-limit bulc_redo? +

Yes. Add a rate_limit block to the bulc_redo 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_redo completely? +

Set action: deny in the PolicyLayer policy for bulc_redo. 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_redo? +

bulc_redo 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.