file_copy · Android MCP Server MCP: Risk & Policy

WHAT IT DOES

What file_copy does on Android MCP Server

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

WHY IT NEEDS A POLICY

Why file_copy needs a policy

file_copy creates or duplicates files and directories on an Android device, modifying the filesystem state. While it includes safeguards against overwriting (adding suffixes), it still fundamentally performs data modification operations. This is classified as Write rather than Execute because it doesn't run arbitrary code or trigger external operations—it performs a specific, contained filesystem operation.

From the tool's definition Tool description indicates it copies files or directories and automatically creates parent directories. The statement '目标已存在时自动加后缀防覆盖' translates to 'automatically adds suffix to prevent overwriting when target exists', confirming it creates or modifies data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

file_copy Rate-limited

file_copy 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": {
    "file_copy": {
      "limits": [
        {
          "counter": "file_copy_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about file_copy

What does the file_copy tool do? +

📋 复制文件或目录。自动创建父目录。目标已存在时自动加后缀防覆盖。. It is categorised as a Write tool in the Android MCP 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 file_copy? +

Register the Android MCP Server MCP server in PolicyLayer and add a rule for file_copy: 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 Android MCP Server. Nothing to install.

What risk level is file_copy? +

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

Can I rate-limit file_copy? +

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

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

file_copy is provided by the Android MCP Server MCP server (wujie272/android-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.