tool_create_view · Mcp Excel MCP: Risk & Policy

WHAT IT DOES

What tool_create_view does on Mcp Excel

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

WHY IT NEEDS A POLICY

Why tool_create_view needs a policy

Creating a view modifies the data environment by adding a new schema object. This is reversible (views can be dropped) and has no financial or destructive impact, making it Write rather than Execute or Destructive. Severity is medium because view creation could affect data analysis workflows and consume resources, but impact is limited to schema structure.

From the tool's definition Tool name 'tool_create_view' indicates creation of a database view, which modifies schema and creates new objects. The server context (Excel/CSV querying via SQL) confirms this creates persistent query definitions.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tool_create_view Rate-limited

tool_create_view 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": {
    "tool_create_view": {
      "limits": [
        {
          "counter": "tool_create_view_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 Mcp Excel, so you can run agents against it safely.

FAQ

Questions about tool_create_view

What does the tool_create_view tool do? +

tool_create_view. It is categorised as a Write tool in the Mcp Excel MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on tool_create_view? +

Register the Mcp Excel MCP server in PolicyLayer and add a rule for tool_create_view: 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 Mcp Excel. Nothing to install.

What risk level is tool_create_view? +

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

Can I rate-limit tool_create_view? +

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

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

tool_create_view is provided by the Mcp Excel MCP server (ivan-loh/mcp-excel). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.