send_excel_email · MCP E-commerce Demo MCP: Risk & Policy

WHAT IT DOES

What send_excel_email does on MCP E-commerce Demo

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

WHY IT NEEDS A POLICY

Why send_excel_email needs a policy

The tool sends emails with Excel attachments, which modifies the state of the email system and creates new messages. While not destructive (emails aren't typically permanent or irreversible in a way that cannot be undone), and not directly financial, this is a Write operation since it creates and transmits data.

From the tool's definition send_excel_email suggests sending/transmitting data (email), which is a write operation that creates and dispatches a message.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_excel_email Rate-limited

send_excel_email 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": {
    "send_excel_email": {
      "limits": [
        {
          "counter": "send_excel_email_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 E-commerce Demo, so you can run agents against it safely.

FAQ

Questions about send_excel_email

What does the send_excel_email tool do? +

發送Excel郵件. It is categorised as a Write tool in the MCP E-commerce Demo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on send_excel_email? +

Register the MCP E-commerce Demo MCP server in PolicyLayer and add a rule for send_excel_email: 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 E-commerce Demo. Nothing to install.

What risk level is send_excel_email? +

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

Can I rate-limit send_excel_email? +

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

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

send_excel_email is provided by the MCP E-commerce Demo MCP server (uberr2000/mcp_demo). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.