update_user_biz_mail_alias · MCP-YNU FastMCP Server MCP

WHAT IT DOES

What update_user_biz_mail_alias does on MCP-YNU FastMCP Server

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

WHY IT NEEDS A POLICY

Why update_user_biz_mail_alias needs a policy

This tool creates or modifies email alias mappings reversibly. It updates user metadata (enterprise email alias) without permanent deletion or financial impact. The blast radius is moderate—misconfiguration could redirect user emails or cause service disruption, but changes are reversible via another update call.

From the tool's definition Tool name contains "update" and description states "设置其企业邮箱别名" (set/configure enterprise email alias). The action modifies email alias configuration for a user based on user_id and biz_mail_alias parameters.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_user_biz_mail_alias Rate-limited

update_user_biz_mail_alias 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": {
    "update_user_biz_mail_alias": {
      "limits": [
        {
          "counter": "update_user_biz_mail_alias_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-YNU FastMCP Server, so you can run agents against it safely.

FAQ

Questions about update_user_biz_mail_alias

What does the update_user_biz_mail_alias tool do? +

根据企微用户id user_id 及企业邮箱别名 biz_mail_alias 设置其企业邮箱别名. It is categorised as a Write tool in the MCP-YNU FastMCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_user_biz_mail_alias? +

Register the MCP-YNU FastMCP Server MCP server in PolicyLayer and add a rule for update_user_biz_mail_alias: 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-YNU FastMCP Server. Nothing to install.

What risk level is update_user_biz_mail_alias? +

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

Can I rate-limit update_user_biz_mail_alias? +

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

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

update_user_biz_mail_alias is provided by the MCP-YNU FastMCP Server MCP server (ynu/mcp-ynu). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.