usg_login · AF_ MCP: Risk & Policy

WHAT IT DOES

What usg_login does on AF_MCP

AI agents invoke usg_login to trigger actions in AF_MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why usg_login needs a policy

This tool authenticates and establishes a session on a USG6000F security device. It is not purely a read operation; it creates login state (a Write/Execute side effect). Given that it gates all subsequent device API calls including blocking/unblocking operations and security policy changes, misuse could enable unauthorized control of security infrastructure.

From the tool's definition 校验 USG6000F 连接账号并建立本地登录态；后续真实设备 API 调用必须先登录 — establishes an authenticated session/login state on a real security device

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

usg_login Rate-limited

usg_login stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "usg_login": {
      "limits": [
        {
          "counter": "usg_login_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches AF_MCP, so you can run agents against it safely.

FAQ

Questions about usg_login

What does the usg_login tool do? +

校验 USG6000F 连接账号并建立本地登录态；后续真实设备 API 调用必须先登录。. It is categorised as a Execute tool in the AF_MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on usg_login? +

Register the AF_ MCP server in PolicyLayer and add a rule for usg_login: 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 AF_MCP. Nothing to install.

What risk level is usg_login? +

usg_login is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit usg_login? +

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

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

usg_login is provided by the AF_ MCP server (xiaqijun/af_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.