auth_login · AF_ MCP: Risk & Policy

WHAT IT DOES

What auth_login does on AF_MCP

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

WHY IT NEEDS A POLICY

Why auth_login needs a policy

This tool authenticates to an AF security device and creates a persistent session. It is a Write operation as it creates a new session object/state on the system. Misuse could allow unauthorized access to security device controls (which include blocking/unblocking operations), making severity medium-to-high. It does not directly execute commands or destroy data, but enables subsequent privileged operations.

From the tool's definition 登录 AF 设备并建立当前 host/namespace 的本地会话 (logs into the AF device and establishes a local session)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

auth_login Rate-limited

auth_login 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": {
    "auth_login": {
      "limits": [
        {
          "counter": "auth_login_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 AF_MCP, so you can run agents against it safely.

FAQ

Questions about auth_login

What does the auth_login tool do? +

登录 AF 设备并建立当前 host/namespace 的本地会话。. It is categorised as a Write tool in the AF_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 auth_login? +

Register the AF_ MCP server in PolicyLayer and add a rule for auth_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 auth_login? +

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

Can I rate-limit auth_login? +

Yes. Add a rate_limit block to the auth_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 auth_login completely? +

Set action: deny in the PolicyLayer policy for auth_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 auth_login? +

auth_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.