bulc_save · BULC Building Designer MCP: Risk & Policy

WHAT IT DOES

What bulc_save does on BULC Building Designer

AI agents use bulc_save 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_save needs a policy

The tool creates or modifies a file on disk by saving the current project state. This is reversible (the file can be overwritten or deleted in a subsequent operation), so it is Write rather than Destructive. Severity is medium because misuse could result in overwriting important project files, but the user can typically recover from backups or undo.

From the tool's definition Tool name is 'bulc_save' with description 'Save the current project to file.' This performs a write operation that persists data to storage.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bulc_save Rate-limited

bulc_save 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_save": {
      "limits": [
        {
          "counter": "bulc_save_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_save

What does the bulc_save tool do? +

Save the current project to file. 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_save? +

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

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

Can I rate-limit bulc_save? +

Yes. Add a rate_limit block to the bulc_save 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_save completely? +

Set action: deny in the PolicyLayer policy for bulc_save. 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_save? +

bulc_save 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.