create_grid

ServerRevit MCP
CategoryWrite

WHAT IT DOES

What create_grid does on Revit MCP

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

THE RISK

Medium Risk

Why create_grid needs a policy

The tool creates new grid elements in a Revit project, which is reversible—grids can be deleted or modified afterward. This places it in the Write category rather than Execute (no arbitrary code execution) or Destructive (not irreversible; grids are part of model structure but can be removed).

From the tool's definition Tool description explicitly states 'Create a grid system in Revit' with customizable parameters for spacing, axes, and naming styles. This is a creation operation that modifies the Revit model by adding new structural/organizational elements.

Documented attack patterns abuse exactly the kind of access create_grid gives an agent:

POLICY

How to control create_grid

PolicyLayer is an MCP gateway — it sits between your AI agents and Revit MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for create_grid:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_grid": {
      "limits": [
        {
          "counter": "create_grid_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

create_grid 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.

Create a free account and register Revit MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Revit MCP tools

Destructive delete_element Delete one or more elements from the Revit model by their element IDs. Destructive operate_element Operate on Revit elements by performing actions such as select, selectionBox, setColor, se Execute say_hello Display a greeting dialog in Revit. Useful for testing the connection between Claude and R Execute send_code_to_revit Send C code to Revit for execution. The code will be inserted into a template with access Write color_elements Color elements in the current view based on a category and parameter value. Each unique pa Write store_project_data Store or update Revit project metadata in the local database. This captures project inform Write store_room_data Store or update room metadata for a specific Revit project in the local database. Rooms ar Write create_level Create one or more levels in Revit at specified elevations. Levels define horizontal plane

All 25 Revit MCP tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about create_grid

What does the create_grid tool do? +

Create a grid system in Revit with smart spacing generation. Supports both X-axis (vertical) and Y-axis (horizontal) grids with customizable naming styles (alphabetic A,B,C or numeric 1,2,3). All units are in millimeters (mm). It is categorised as a Write tool in the Revit MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_grid? +

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

What risk level is create_grid? +

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

Can I rate-limit create_grid? +

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

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

create_grid is provided by the Revit MCP server (mcp-servers-for-revit/revit-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Revit MCP tool call.

Start from Revit MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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