send_email · xigua- MCP: Risk & Policy

WHAT IT DOES

What send_email does on xigua-MCP

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

WHY IT NEEDS A POLICY

Why send_email needs a policy

The tool creates and sends email messages, which modifies external email system state. This is categorized as Write rather than Execute because sending email is a discrete communication action, not arbitrary code execution. Severity is medium because misuse could send emails to unintended recipients or with harmful content, but the action is reversible through email deletion/recall mechanisms.

From the tool's definition send_email tool with description '发送邮件工具' (send email tool) - creates and transmits email messages, a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_email Rate-limited

send_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_email": {
      "limits": [
        {
          "counter": "send_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 xigua-MCP, so you can run agents against it safely.

FAQ

Questions about send_email

What does the send_email tool do? +

发送邮件工具。. It is categorised as a Write tool in the xigua-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 send_email? +

Register the xigua- MCP server in PolicyLayer and add a rule for send_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 xigua-MCP. Nothing to install.

What risk level is send_email? +

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

Can I rate-limit send_email? +

Yes. Add a rate_limit block to the send_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_email completely? +

Set action: deny in the PolicyLayer policy for send_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_email? +

send_email is provided by the xigua- MCP server (xiguaxiaome/xigua-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.