set_whitelist_file · AF_ MCP: Risk & Policy

WHAT IT DOES

What set_whitelist_file does on AF_MCP

AI agents use set_whitelist_file 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 set_whitelist_file needs a policy

This tool creates or modifies whitelist configuration data in a reversible manner (the whitelist file path and settings can be changed or restored). It does not delete data (Destructive), execute arbitrary code (Execute), or move money (Financial). While it affects security device behavior through whitelist management, the tool itself performs configuration modification (Write).

From the tool's definition Tool description states '设置当前全局白名单文件路径，并持久化到本地配置文件' (set current global whitelist file path and persist to local configuration file). This modifies whitelist configuration and persists changes to disk.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_whitelist_file Rate-limited

set_whitelist_file 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": {
    "set_whitelist_file": {
      "limits": [
        {
          "counter": "set_whitelist_file_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 set_whitelist_file

What does the set_whitelist_file tool do? +

设置当前全局白名单文件路径，并持久化到本地配置文件。. 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 set_whitelist_file? +

Register the AF_ MCP server in PolicyLayer and add a rule for set_whitelist_file: 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 set_whitelist_file? +

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

Can I rate-limit set_whitelist_file? +

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

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

set_whitelist_file 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.