tag_all_walls · Revit MCP: Risk & Policy

WHAT IT DOES

What tag_all_walls does on Revit

AI agents use tag_all_walls to create or update resources in Revit — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Revit environment.

WHY IT NEEDS A POLICY

Why tag_all_walls needs a policy

This tool creates new elements (tags) in the Revit project, making it a Write operation rather than Read. While tag creation is reversible (tags can be deleted), it is a persistent modification to the project.

From the tool's definition The tool 'tag_all_walls' creates tags for all walls in the current view, which modifies the Revit project by adding new annotation elements.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tag_all_walls Rate-limited

tag_all_walls 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": {
    "tag_all_walls": {
      "limits": [
        {
          "counter": "tag_all_walls_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 Revit, so you can run agents against it safely.

FAQ

Questions about tag_all_walls

What does the tag_all_walls tool do? +

Create tags for all walls in the current active view. Tags will be placed at the middle point of each wall. It is categorised as a Write tool in the Revit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on tag_all_walls? +

Register the Revit MCP server in PolicyLayer and add a rule for tag_all_walls: 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 Revit. Nothing to install.

What risk level is tag_all_walls? +

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

Can I rate-limit tag_all_walls? +

Yes. Add a rate_limit block to the tag_all_walls 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 tag_all_walls completely? +

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

tag_all_walls is provided by the Revit MCP server (mohamed-elnahla/revit-mcp-github-copilot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.